Merge master

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,42 +1,77 @@
-name: 🐞 Bug report
+name: 🐛 Bug report
 description: Report broken functionality.
 labels: [bug]
 
 body:
-- type: markdown
+  - type: markdown
     attributes:
       value: |
-      🧐 **Guidelines:**
+        - Avoid generic or vague titles such as "Something's not working" or "A couple of problems" — be as descriptive as possible.
+        - Keep your issue focused on one single problem. If you have multiple bug reports, please create a separate issue for each of them.
+        - Issues should represent **complete and actionable** work items. If you are unsure about something or have a question, please start a [discussion](https://github.com/Tyrrrz/CliFx/discussions/new) instead.
+        - Remember that **CliFx** is an open-source project funded by the community. If you find it useful, **please consider [donating](https://tyrrrz.me/donate) to support its development**.
 
-      - Search through [existing issues](https://github.com/Tyrrrz/CliFx/issues?q=is%3Aissue) first to ensure that this bug has not been reported before.
-      - Write a descriptive title for your issue. Avoid generic or vague titles such as "Something's not working" or "A couple of problems".
-      - Keep your issue focused on one single problem. If you have multiple bug reports, please create separate issues for each of them.
-      - Provide as much context as possible in the details section. Include screenshots, screen recordings, links, references, or anything else you may consider relevant.
-      - If you want to ask a question instead of reporting a bug, please use [discussions](https://github.com/Tyrrrz/CliFx/discussions/new) instead.
+        ___
 
-- type: input
+  - type: input
     attributes:
       label: Version
-    description: Which version of CliFx does this bug affect?
-    placeholder: ver X.Y.Z
+      description: Which version of the package does this bug affect? Make sure you're not using an outdated version.
+      placeholder: v1.0.0
     validations:
       required: true
 
-- type: textarea
+  - type: input
     attributes:
-    label: Details
-    description: Clear and thorough explanation of the bug.
-    placeholder: I was doing X expecting Y to happen, but Z happened instead.
+      label: Platform
+      description: Which platform do you experience this bug on?
+      placeholder: .NET 7.0 / Windows 11
     validations:
       required: true
 
-- type: textarea
+  - type: textarea
     attributes:
       label: Steps to reproduce
-    description: Minimum steps required to reproduce the bug.
+      description: >
+        Minimum steps required to reproduce the bug, including prerequisites, code snippets, or other relevant items.
+        The information provided in this field must be readily actionable, meaning that anyone should be able to reproduce the bug by following these steps.
+        If the reproduction steps are too complex to fit in this field, please provide a link to a repository instead.
       placeholder: |
         - Step 1
         - Step 2
         - Step 3
     validations:
       required: true
+
+  - type: textarea
+    attributes:
+      label: Details
+      description: Clear and thorough explanation of the bug, including any additional information you may find relevant.
+      placeholder: |
+        - Expected behavior: ...
+        - Actual behavior: ...
+    validations:
+      required: true
+
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Quick list of checks to ensure that everything is in order.
+      options:
+        - label: I have looked through existing issues to make sure that this bug has not been reported before
+          required: true
+        - label: I have provided a descriptive title for this issue
+          required: true
+        - label: I have made sure that this bug is reproducible on the latest version of the package
+          required: true
+        - label: I have provided all the information needed to reproduce this bug as efficiently as possible
+          required: true
+        - label: I have sponsored this project
+          required: false
+        - label: I have not read any of the above and just checked all the boxes to submit the issue
+          required: false
+
+  - type: markdown
+    attributes:
+      value: |
+        If you are struggling to provide actionable reproduction steps, or if something else is preventing you from creating a complete bug report, please start a [discussion](https://github.com/Tyrrrz/CliFx/discussions/new) instead.

.github/ISSUE_TEMPLATE/config.yml

@@ -3,9 +3,9 @@ contact_links:
   - name: ⚠ Feature request
     url: https://github.com/Tyrrrz/.github/blob/master/docs/project-status.md
     about: Sorry, but this project is in maintenance mode and no longer accepts new feature requests.
-  - name: 💬 Discord server
-    url: https://discord.gg/2SUWKFnHSm
-    about: Chat with the project community.
   - name: 🗨 Discussions
     url: https://github.com/Tyrrrz/CliFx/discussions/new
     about: Ask and answer questions.
+  - name: 💬 Discord server
+    url: https://discord.gg/2SUWKFnHSm
+    about: Chat with the project community.

.github/dependabot.yml

@@ -0,0 +1,22 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: monthly
+    labels:
+      - enhancement
+    groups:
+      actions:
+        patterns:
+          - "*"
+  - package-ecosystem: nuget
+    directory: "/"
+    schedule:
+      interval: monthly
+    labels:
+      - enhancement
+    groups:
+      nuget:
+        patterns:
+          - "*"

.github/workflows/main.yml

@@ -1,12 +1,33 @@
 name: main
 
-on: [push, pull_request]
+on:
+  workflow_dispatch:
+    inputs:
+      package-version:
+        type: string
+        description: Package version
+        required: false
+      deploy:
+        type: boolean
+        description: Deploy package
+        required: false
+        default: false
+  push:
+    branches:
+      - master
+    tags:
+      - "*"
+  pull_request:
+    branches:
+      - master
 
 jobs:
   main:
     uses: Tyrrrz/.github/.github/workflows/nuget.yml@master
     with:
-      dotnet-version: 7.0.x
+      deploy: ${{ inputs.deploy || github.ref_type == 'tag' }}
+      package-version: ${{ inputs.package-version || (github.ref_type == 'tag' && github.ref_name) || format('0.0.0-ci-{0}', github.sha) }}
+      dotnet-version: 9.0.x
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       NUGET_TOKEN: ${{ secrets.NUGET_TOKEN }}

.gitignore

@@ -1,21 +1,12 @@
 # User-specific files
+.vs/
+.idea/
 *.suo
 *.user
-*.userosscache
-*.sln.docstates
-.idea/
 
 # Build results
-[Dd]ebug/
-[Dd]ebugPublic/
-[Rr]elease/
-[Rr]eleases/
-[Xx]64/
-[Xx]86/
-[Bb]uild/
-bld/
-[Bb]in/
-[Oo]bj/
+bin/
+obj/
 
-# Coverage
-*.opencover.xml
+# Test results
+TestResults/

Changelog.md

@@ -1,173 +0,0 @@
-# Changelog
-
-## v2.3.2 (06-Apr-2023)
-
-- Added name-based ordering to subcommands when displayed in the help text. (Thanks [@CartBlanche](https://github.com/CartBlanche))
-
-## v2.3.1 (08-Dec-2022)
-
-- Added support for the `required` keyword introduced in C# 11. Command options bound to required properties are now marked as required by default (equivalent to setting `IsRequired = true` on the attribute). Also added analyzers that prevent marking an option or parameter non-required if it's bound to a required property.
-
-## v2.3 (12-Jul-2022)
-
-- Added console dimension properties `WindowWidth` and `WindowHeight` to `IConsole` interface and implementing classes.
-- Improved inline documentation for members of `IConsole` interface.
-
-## v2.2.6 (14-Jun-2022)
-
-- Added an overload of `CliApplicationBuilder.UseTypeActivator(...)` that accepts an instance of `IServiceProvider`. This slightly simplifies integration with many DI containers.
-- Fixed minor grammar mistakes in user-facing error messages.
-
-## v2.2.5 (10-May-2022)
-
-- Updated default value resolution for the application executable name. It will now resolve to `myapp.exe` instead of `dotnet myapp.dll` when the application is launched through the EXE apphost on Windows. On other platforms, or when running the application through the .NET CLI, the behavior will be the same as before.
-
-## v2.2.4 (22-Apr-2022)
-
-- Added more contextual information to analyzer diagnostics.
-- Fixed an issue where the analyzer incorrectly reported an error on converters that didn't directly match the target type but were compatible through known built-in conversions.
-- Fixed an issue where MSBuild produced a lot of analyzer-related warnings in certain circumstances.
-
-## v2.2.3 (17-Apr-2022)
-
-- Changed method signature of `IConsole.ReadKey()` to return `ConsoleKeyInfo` instead of `void`. The return type was originally defined as `void` by mistake. This change is source-backwards-compatible but may break on binary level if you were previously calling this method indirectly (i.e. through a library).
-- Added `FakeConsole.EnqueueKey(...)` to facilitate the testing of `IConsole.ReadKey()`. You can use this method to simulate key presses in your application.
-- Extended analyzers that verify the correctness of specified converters and validators. They now also ensure that the specified types are compatible with the type of the underlying property.
-- Improved diagnostics produced by analyzers. Where relevant, highlighted code is now limited to the property or type identifier, instead of the whole property or type declaration. Also extended the diagnostic messages with additional information.
-- Fixed an issue where throwing an exception inside a constructor of a command type resulted in an unrelated error message about the absence of a parameterless constructor.
-
-## v2.2.2 (30-Jan-2022)
-
-- Fixed an issue where `ConsoleWriter` and `ConsoleReader` were not properly thread-safe.
-- Fixed an issue where the analyzer failed to load under certain circumstances when running inside Visual Studio.
-
-## v2.2.1 (16-Jan-2022)
-
-- Fixed an issue which caused help text to not show default values for optional parameters. (Thanks [@AliReZa Sabouri](https://github.com/alirezanet))
-
-## v2.2 (11-Jan-2022)
-
-- Added support for optional parameters. A parameter can be marked as optional by setting `IsRequired = false` on the attribute. Only one parameter is allowed to be optional and such parameter must be the last in order. (Thanks [@AliReZa Sabouri](https://github.com/alirezanet))
-- Fixed an issue where parameters and options bound to properties implemented as default interface members were not working correctly. (Thanks [@AliReZa Sabouri](https://github.com/alirezanet))
-
-## v2.1 (04-Jan-2022)
-
-- Added `IConsole.Clear()` with corresponding implementations in `SystemConsole`, `FakeConsole`, and `FakeInMemoryConsole`. (Thanks [@Alex Rosenfeld](https://github.com/alexrosenfeld10))
-- Added `IConsole.ReadKey()` with corresponding implementations in `SystemConsole`, `FakeConsole`, and `FakeInMemoryConsole`. (Thanks [@Alex Rosenfeld](https://github.com/alexrosenfeld10))
-- Fixed an issue that caused parameters to appear out of order in the usage format section of the help text. (Thanks [@David Fallah](https://github.com/TAGC))
-
-## v2.0.6 (17-Jul-2021)
-
-- Fixed an issue where an exception thrown via reflection during parameter or option binding resulted in `Exception has been thrown by the target of an invocation` error instead of a more useful message. Such exceptions will now be unwrapped to provide better user experience.
-
-## v2.0.5 (09-Jul-2021)
-
-- Fixed an issue where calling `IConsole.Output.Encoding.EncodingName` and some other members threw an exception.
-- Added readme file to the package.
-
-## v2.0.4 (24-Apr-2021)
-
-- Fixed an issue where output and error streams in `SystemConsole` defaulted to UTF8 encoding with BOM when the application was running with UTF8 codepage. `ConsoleWriter` will now discard preamble from the specified encoding. This fix brings the behavior of `SystemConsole` in line with .NET's own `System.Console` which also discards preamble for output and error streams.
-- Fixed an issue where help text tried to show default values for parameters and options whose type does not override `ToString()` method.
-- Fixed an issue where help text didn't show default values for parameters and options whose type is an enumerable of nullable enums. (Thanks [@Robert Dailey](https://github.com/rcdailey))
-- Fixed an issue where specific parts of the help text weren't legible in some terminals due to low color resolution. Removed the usage of `ConsoleColor.DarkGray` in help text.
-
-## v2.0.3 (09-Apr-2021)
-
-- Improved help text by showing valid values for non-scalar enum parameters and options. (Thanks [@Robert Dailey](https://github.com/rcdailey))
-
-## v2.0.2 (31-Mar-2021)
-
-- Fixed an issue where having a transitive reference to CliFx sometimes resulted in `SystemConsoleShouldBeAvoidedAnalyzer` throwing `NullReferenceException` during build.
-- Fixed some documentation typos and inconsistencies.
-
-## v2.0.1 (24-Mar-2021)
-
-- Fixed an issue where some exceptions with async stack traces generated on .NET 3.1 or earlier were not parsed and formatted correctly.
-- Fixed an issue where help text applied slightly incorrect formatting when displaying choices for enum-based parameters and properties.
-
-## v2.0 (21-Mar-2021)
-
-> Note: this major release includes many breaking changes.
-> Please refer to the readme to find updated instructions and usage examples.
-
-- Renamed property `EnvironmentVariableName` to `EnvironmentVariable` on `CommandOption` attribute.
-- Removed most of schema validation checks that used to take place during application startup. Going forward, CliFx will be relying solely on its built-in set of Roslyn analyzers to catch common errors in command configuration.
-- Removed `ProgressTicker` utility. The recommended migration path is to use the [Spectre.Console](https://github.com/spectresystems/spectre.console) library which provides a wide array of console widgets and components. See [this wiki page](https://github.com/Tyrrrz/CliFx/wiki/Integrating-with-Spectre.Console) to learn how to integrate Spectre.Console with CliFx.
-- Removed `MemoryStreamWriter` utility as it's no longer used within CliFx.
-- Improved wording in all error messages.
-- Renamed some methods on `CliApplicationBuilder`:
-  - `UseTitle()` renamed to `SetTitle()`
-  - `UseExecutableName()` renamed to `SetExecutableName()`
-  - `UseVersionText()` renamed to `SetVersion()`
-  - `UseDescription()` renamed to `SetDescription()`
-- Changed the behavior of autogenerated help text:
-  - Changed the color scheme to a more neutral set of tones
-  - Assigned separate colors to parameters and options to make them visually stand out
-  - Usage section no longer lists usage formats of all descendant commands
-  - Command section now also lists available subcommands for each of the current command's subcommands
-- Changed the behavior of `[preview]` directive. Running the application with this directive will now also print all resolved environment variables, in addition to parsed command-line arguments.
-- Reworked `IArgumentValueConverter`/`ArgumentValueConverter` into `BindingConverter`. Method `ConvertFrom(...)` has been renamed to `Convert(...)`.
-- Reworked `ArgumentValueValidator` into `BindingValidator`. This class exposes an abstract `Validate(...)` method that returns a nullable `BindingValidationError`. This class also provides utility methods `Ok()` and `Error(...)` to help create corresponding validation results.
-- Changed the type of `IConsole.Output` and `IConsole.Error` from `StreamWriter` to `ConsoleWriter`. This type derives from `StreamWriter` and additionally exposes a `Console` property that refers to the console instance that owns the stream. This change enables you to author extension methods scoped specifically to console output and error streams.
-- Changed the type of `IConsole.Input` from `StreamReader` to `ConsoleReader`. This type derives from `StreamReader` and additionally exposes a `Console` property that refers to the console instance that owns the stream. This change enables you to author extension methods scoped specifically to the console input stream.
-- Changed methods `IConsole.WithForegroundColor(...)`, `IConsole.WithBackgroundColor(...)`, and `IConsole.WithColors(...)` to return `IDisposable`, replacing the delegate parameter they previously had. You can wrap the returned `IDisposable` in a using statement to ensure that the console colors get reset back to their original values once the execution reaches the end of the block.
-- Renamed `IConsole.GetCancellationToken()` to `IConsole.RegisterCancellationHandler()`.
-- Reworked `VirtualConsole` into `FakeConsole`. This class no longer takes `CancellationToken` as a constructor parameter, but instead encapsulates its own instance of `CancellationTokenSource` that can be triggered using the provided `RequestCancellation()` method.
-- Removed `VirtualConsole.CreateBuffered()` and replaced it with the `FakeInMemoryConsole` class. This class derives from `FakeConsole` and uses in-memory standard input, output, and error streams. It also provides methods to easily read the data written to the streams.
-- Moved some types to different namespaces:
-  - `IConsole`/`FakeConsole`/`FakeInMemoryConsole` moved from `CliFx` to `CliFx.Infrastructure`
-  - `ITypeActivator`/`DefaultTypeActivator`/`DelegateTypeActivator` moved from `CliFx` to `CliFx.Infrastructure`
-  - `BindingValidator`/`BindingConverter` moved from `CliFx` to `CliFx.Extensibility`
-
-## v1.6 (06-Dec-2020)
-
-- Added support for custom value validators. You can now create a type that inherits from `CliFx.ArgumentValueValidator<T>` to implement reusable validation logic for command arguments. To use a validator, include it in the `Validators` property on the `CommandOption` or `CommandParameter` attribute. (Thanks [@Oleksandr Shustov](https://github.com/AlexandrShustov))
-- Added `CliFx.ArgumentValueConverter<T>` class that you can inherit from to implement custom value converters. `CliFx.IArgumentValueConverter` interface is still available, but it is recommended to inherit from the generic class instead, due to the type safety it provides. The interface may become internal or get removed in one of the future major versions.
-- Updated requirements for option names and short names: short names now must be letter characters (lowercase or uppercase), while names must now start with a letter character. This means option names can no longer start with a digit or a special character. This change makes it possible to pass negative number values without the need to quote them, i.e. `--my-number -5`.
-
-## v1.5 (23-Oct-2020)
-
-- Added pretty-printing for unhandled exceptions thrown from within the application. This makes the errors easier to parse visually and should help in troubleshooting. This change does not affect `CommandException`, as it already has special treatment. (Thanks [@Mårten Åsberg](https://github.com/89netraM))
-- Added support for custom value converters. You can now create a type that implements `CliFx.IArgumentValueConverter` and specify it as a converter for your parameters or options via the `Converter` named property. This should enable conversion between raw argument values and custom types which are not string-initializable. (Thanks [@Oleksandr Shustov](https://github.com/AlexandrShustov))
-- Improved help text so that it also shows minimal usage examples for child and descendant commands, besides the actual command it was requested on. This should improve user experience for applications with many nested commands. (Thanks [@Nikiforov Alexey](https://github.com/NikiforovAll))
-
-## v1.4 (20-Aug-2020)
-
-- Added `VirtualConsole.CreateBuffered()` method to simplify test setup when using in-memory backing stores for output and error streams. Please refer to the readme for updated recommendations on how to test applications built with CliFx.
-- Added generic `CliApplicationBuilder.AddCommand<TCommand>()`. This overload simplifies adding commands one-by-one as it also checks that the type implements `ICommand`.
-
-## v1.3.2 (31-Jul-2020)
-
-- Fixed an issue where a command was incorrectly allowed to execute when the user did not specify any value for a non-scalar parameter. Since they are always required, a parameter needs to be bound to at least one value. (Thanks [@Daniel Hix](https://github.com/ADustyOldMuffin))
-- Fixed an issue where `CliApplication.RunAsync(...)` threw `ArgumentException` if there were two environment variables, whose names differed only in case. Environment variable names are now treated case-sensitively. (Thanks [@Ron Myers](https://github.com/ron-myers))
-
-## v1.3.1 (19-Jul-2020)
-
-- Running the application with the debug directive (`myapp [debug]`) will now also try to launch a debugger instance. In most cases it will save time as you won't need to attach the debugger manually. (Thanks [@Volodymyr Shkolka](https://github.com/BlackGad))
-- Fixed an issue where unhandled generic exceptions (i.e. not `CommandException`) sometimes caused the application to incorrectly return successful exit code due to an overflow issue on Unix systems. Starting from this version, all unhandled generic exceptions will produce `1` as the exit code when thrown. Instances of `CommandException` can still be configured to return any specified exit code, but it's recommended to constrain the values between `1` and `255` to avoid overflow issues. (Thanks [@Ihor Nechyporuk](https://github.com/inech))
-
-## v1.3 (23-May-2020)
-
-- Changed analyzers to report errors instead of warnings. If you find that some analyzer works incorrectly, please report it on GitHub. You can also configure inspection severity overrides in your project if you need to.
-- Improved help text by showing default values for non-required options. This only works on types that have a custom override for `ToString()` method. Additionally, if the type implements `IFormattable`, the overload with a format provider will be used instead. (Thanks [@Domn Werner](https://github.com/domn1995))
-- Changed default version text to only show 3 version components instead of 4, if the last component (revision) is not specified or is zero. This makes the default version text compliant with semantic versioning.
-- Fixed an issue where it was possible to define a command with an option that has the same name or short name as built-in help or version options. Previously it would lead to the user-defined option being ignored in favor of the built-in option. Now this will throw an exception instead.
-- Changed the underlying representation of `StreamReader`/`StreamWriter` objects used in `SystemConsole` and `VirtualConsole` to be thread-safe.
-
-## v1.2 (11-May-2020)
-
-- Added built-in Roslyn analyzers that help catch incorrect usage of the library. Currently, all analyzers report issues as warnings so as to not prevent the project from building. In the future that may change.
-- Added an optional parameter to `new CommandException(...)` called `showHelp` which can be used to instruct CliFx to show help for the current command after printing the error. (Thanks [@Domn Werner](https://github.com/domn1995))
-- Improved help text shown for enum options and parameters by providing the list of valid values that the enum can accept. (Thanks [@Domn Werner](https://github.com/domn1995))
-- Fixed an issue where it was possible to set an option without providing a value, while the option was marked as required.
-- Fixed an issue where it was possible to configure an option with an empty name or a name consisting of a single character. If you want to use a single character as a name, you should set the option's short name instead.
-- Added `CursorLeft` and `CursorTop` properties to `IConsole` and its implementations. In `VirtualConsole`, these are just auto-properties.
-- Improved exception messages.
-- Improved exceptions related to user input by also showing help text after the error message. (Thanks [@Domn Werner](https://github.com/domn1995))
-
-## v1.1 (16-Mar-2020)
-
-- Changed `IConsole` interface (and as a result, `SystemConsole` and `VirtualConsole`) to support writing binary data. Instead of `TextReader`/`TextWriter` instances, the streams are now exposed as `StreamReader`/`StreamWriter` which provide the `BaseStream` property that allows raw access. Existing usages inside commands should remain the same because `StreamReader`/`StreamWriter` are compatible with their base classes `TextReader`/`TextWriter`, but if you were using `VirtualConsole` in tests, you may have to update it to the new API. Refer to the readme for more info.
-- Changed argument binding behavior so that an error is produced if the user provides an argument that doesn't match with any parameter or option. This is done in order to improve user experience, as otherwise the user may make a typo without knowing that their input wasn't taken into account.
-- Changed argument binding behavior so that options can be set to multiple argument values while specifying them with mixed naming. For example, `--option value1 -o value2 --option value3` would result in the option being set to corresponding three values, assuming `--option` and `-o` match with the same option.

CliFx.Analyzers.Tests/CliFx.Analyzers.Tests.csproj

@@ -1,27 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Basic.Reference.Assemblies.Net70" Version="1.4.1" />
-    <PackageReference Include="GitHubActionsTestLogger" Version="2.0.1" PrivateAssets="all" />
-    <PackageReference Include="FluentAssertions" Version="6.10.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" PrivateAssets="all" />
-    <PackageReference Include="coverlet.collector" Version="3.2.0" PrivateAssets="all" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\CliFx.Analyzers\CliFx.Analyzers.csproj" />
-    <ProjectReference Include="..\CliFx\CliFx.csproj" />
-  </ItemGroup>
-
-</Project>

CliFx.Analyzers.Tests/CommandMustBeAnnotatedAnalyzerSpecs.cs

@@ -1,79 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class CommandMustBeAnnotatedAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new CommandMustBeAnnotatedAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_command_is_not_annotated_with_the_command_attribute()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_command_is_annotated_with_the_command_attribute()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public abstract class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_command_is_implemented_as_an_abstract_class()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public abstract class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_class_that_is_not_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class Foo
-            {
-                public int Bar { get; set; } = 5;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/CommandMustImplementInterfaceAnalyzerSpecs.cs

@@ -1,63 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class CommandMustImplementInterfaceAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new CommandMustImplementInterfaceAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_command_does_not_implement_ICommand_interface()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand
-            {
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_command_implements_ICommand_interface()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_class_that_is_not_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class Foo
-            {
-                public int Bar { get; set; } = 5;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/GeneralSpecs.cs

@@ -1,30 +0,0 @@
-using System;
-using System.Linq;
-using FluentAssertions;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class GeneralSpecs
-{
-    [Fact]
-    public void All_analyzers_have_unique_diagnostic_IDs()
-    {
-        // Arrange
-        var analyzers = typeof(AnalyzerBase)
-            .Assembly
-            .GetTypes()
-            .Where(t => !t.IsAbstract && t.IsAssignableTo(typeof(DiagnosticAnalyzer)))
-            .Select(t => (DiagnosticAnalyzer) Activator.CreateInstance(t)!)
-            .ToArray();
-
-        // Act
-        var diagnosticIds = analyzers
-            .SelectMany(a => a.SupportedDiagnostics.Select(d => d.Id))
-            .ToArray();
-
-        // Assert
-        diagnosticIds.Should().OnlyHaveUniqueItems();
-    }
-}

CliFx.Analyzers.Tests/OptionMustBeInsideCommandAnalyzerSpecs.cs

@@ -1,87 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustBeInsideCommandAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustBeInsideCommandAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_is_inside_a_class_that_is_not_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyClass
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_is_inside_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_is_inside_an_abstract_class()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public abstract class MyCommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustBeRequiredIfPropertyRequiredAnalyzerSpecs.cs

@@ -1,114 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustBeRequiredIfPropertyRequiredAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustBeRequiredIfPropertyRequiredAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_non_required_option_is_bound_to_a_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f', IsRequired = false)]
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_required_option_is_bound_to_a_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f', IsRequired = true)]
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_required_option_is_bound_to_a_non_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f', IsRequired = false)]
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_required_option_is_bound_to_a_non_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f', IsRequired = true)]
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveNameOrShortNameAnalyzerSpecs.cs

@@ -1,93 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveNameOrShortNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveNameOrShortNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_does_not_have_a_name_or_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption(null)]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveUniqueNameAnalyzerSpecs.cs

@@ -1,99 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveUniqueNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveUniqueNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_the_same_name_as_another_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                [CommandOption("foo")]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_unique_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                [CommandOption("bar")]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_a_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveUniqueShortNameAnalyzerSpecs.cs

@@ -1,123 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveUniqueShortNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveUniqueShortNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_the_same_short_name_as_another_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                [CommandOption('f')]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_unique_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                [CommandOption('b')]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_short_name_which_is_unique_only_in_casing()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                [CommandOption('F')]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_a_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveValidConverterAnalyzerSpecs.cs

@@ -1,181 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveValidConverterAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveValidConverterAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_converter_that_does_not_derive_from_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter
-            {
-                public string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_converter_that_does_not_derive_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<int>
-            {
-                public override int Convert(string rawValue) => 42;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<string>
-            {
-                public override string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_nullable_option_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<int>
-            {
-                public override int Convert(string rawValue) => 42;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public int? Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_scalar_option_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<string>
-            {
-                public override string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public IReadOnlyList<string> Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_a_converter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveValidNameAnalyzerSpecs.cs

@@ -1,114 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveValidNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveValidNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_name_which_is_too_short()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("f")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_name_that_starts_with_a_non_letter_character()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("1foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_valid_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_a_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveValidShortNameAnalyzerSpecs.cs

@@ -1,93 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveValidShortNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveValidShortNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_short_name_which_is_not_a_letter_character()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('1')]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_a_valid_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption('f')]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_a_short_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/OptionMustHaveValidValidatorsAnalyzerSpecs.cs

@@ -1,129 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class OptionMustHaveValidValidatorsAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new OptionMustHaveValidValidatorsAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_validator_that_does_not_derive_from_BindingValidator()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator
-            {
-                public void Validate(string value) {}
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_an_option_has_a_validator_that_does_not_derive_from_a_compatible_BindingValidator()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator : BindingValidator<int>
-            {
-                public override BindingValidationError Validate(int value) => Ok();
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_has_validators_that_all_derive_from_compatible_BindingValidators()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator : BindingValidator<string>
-            {
-                public override BindingValidationError Validate(string value) => Ok();
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_an_option_does_not_have_validators()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo")]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_an_option()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeInsideCommandAnalyzerSpecs.cs

@@ -1,87 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeInsideCommandAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeInsideCommandAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_is_inside_a_class_that_is_not_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyClass
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_is_inside_a_command()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_is_inside_an_abstract_class()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public abstract class MyCommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeLastIfNonRequiredAnalyzerSpecs.cs

@@ -1,102 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeLastIfNonRequiredAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeLastIfNonRequiredAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_non_required_parameter_is_not_the_last_in_order()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = false)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_required_parameter_is_the_last_in_order()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, IsRequired = false)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_no_non_required_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, IsRequired = true)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeLastIfNonScalarAnalyzerSpecs.cs

@@ -1,102 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeLastIfNonScalarAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeLastIfNonScalarAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_non_scalar_parameter_is_not_the_last_in_order()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string[] Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_scalar_parameter_is_the_last_in_order()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string[] Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_no_non_scalar_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeRequiredIfPropertyRequiredAnalyzerSpecs.cs

@@ -1,114 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeRequiredIfPropertyRequiredAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeRequiredIfPropertyRequiredAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_non_required_parameter_is_bound_to_a_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = false)]
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_required_parameter_is_bound_to_a_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = true)]
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_required_parameter_is_bound_to_a_non_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = false)]
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_required_parameter_is_bound_to_a_non_required_property()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = true)]
-                public string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public required string Foo { get; set; }
-
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeSingleIfNonRequiredAnalyzerSpecs.cs

@@ -1,102 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeSingleIfNonRequiredAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeSingleIfNonRequiredAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_more_than_one_non_required_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, IsRequired = false)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, IsRequired = false)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_only_one_non_required_parameter_is_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, IsRequired = false)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_no_non_required_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, IsRequired = true)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustBeSingleIfNonScalarAnalyzerSpecs.cs

@@ -1,102 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustBeSingleIfNonScalarAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustBeSingleIfNonScalarAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_more_than_one_non_scalar_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string[] Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string[] Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_only_one_non_scalar_parameter_is_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string[] Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_no_non_scalar_parameters_are_defined()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustHaveUniqueNameAnalyzerSpecs.cs

@@ -1,78 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustHaveUniqueNameAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustHaveUniqueNameAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_has_the_same_name_as_another_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Name = "foo")]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, Name = "foo")]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_has_unique_name()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Name = "foo")]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1, Name = "bar")]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustHaveUniqueOrderAnalyzerSpecs.cs

@@ -1,78 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustHaveUniqueOrderAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustHaveUniqueOrderAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_has_the_same_order_as_another_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(0)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_has_unique_order()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                [CommandParameter(1)]
-                public string Bar { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustHaveValidConverterAnalyzerSpecs.cs

@@ -1,182 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustHaveValidConverterAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustHaveValidConverterAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_has_a_converter_that_does_not_derive_from_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter
-            {
-                public string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_has_a_converter_that_does_not_derive_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<int>
-            {
-                public override int Convert(string rawValue) => 42;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<string>
-            {
-                public override string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Converter = typeof(MyConverter))]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_nullable_parameter_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<int>
-            {
-                public override int Convert(string rawValue) => 42;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandOption("foo", Converter = typeof(MyConverter))]
-                public int? Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_non_scalar_parameter_has_a_converter_that_derives_from_a_compatible_BindingConverter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyConverter : BindingConverter<string>
-            {
-                public override string Convert(string rawValue) => rawValue;
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Converter = typeof(MyConverter))]
-                public IReadOnlyList<string> Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_does_not_have_a_converter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/ParameterMustHaveValidValidatorsAnalyzerSpecs.cs

@@ -1,129 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class ParameterMustHaveValidValidatorsAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new ParameterMustHaveValidValidatorsAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_a_parameter_has_a_validator_that_does_not_derive_from_BindingValidator()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator
-            {
-                public void Validate(string value) {}
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_parameter_has_a_validator_that_does_not_derive_from_a_compatible_BindingValidator()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator : BindingValidator<int>
-            {
-                public override BindingValidationError Validate(int value) => Ok();
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_has_validators_that_all_derive_from_compatible_BindingValidators()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            public class MyValidator : BindingValidator<string>
-            {
-                public override BindingValidationError Validate(string value) => Ok();
-            }
-            
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0, Validators = new[] {typeof(MyValidator)})]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_parameter_does_not_have_validators()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                [CommandParameter(0)]
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_on_a_property_that_is_not_a_parameter()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public string Foo { get; set; }
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/SystemConsoleShouldBeAvoidedAnalyzerSpecs.cs

@@ -1,139 +0,0 @@
-using CliFx.Analyzers.Tests.Utils;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Xunit;
-
-namespace CliFx.Analyzers.Tests;
-
-public class SystemConsoleShouldBeAvoidedAnalyzerSpecs
-{
-    private static DiagnosticAnalyzer Analyzer { get; } = new SystemConsoleShouldBeAvoidedAnalyzer();
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_command_calls_a_method_on_SystemConsole()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console)
-                {
-                    Console.WriteLine("Hello world");
-                    return default;
-                }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_command_accesses_a_property_on_SystemConsole()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console)
-                {
-                    Console.ForegroundColor = ConsoleColor.Black;
-                    return default;
-                }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_reports_an_error_if_a_command_calls_a_method_on_a_property_of_SystemConsole()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console)
-                {
-                    Console.Error.WriteLine("Hello world");
-                    return default;
-                }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().ProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_command_interacts_with_the_console_through_IConsole()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console)
-                {
-                    console.Output.WriteLine("Hello world");
-                    return default;
-                }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_IConsole_is_not_available_in_the_current_method()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public void SomeOtherMethod() => Console.WriteLine("Test");
-            
-                public ValueTask ExecuteAsync(IConsole console) => default;
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-
-    [Fact]
-    public void Analyzer_does_not_report_an_error_if_a_command_does_not_access_SystemConsole()
-    {
-        // Arrange
-        // language=cs
-        const string code =
-            """
-            [Command]
-            public class MyCommand : ICommand
-            {
-                public ValueTask ExecuteAsync(IConsole console)
-                {
-                    return default;
-                }
-            }
-            """;
-
-        // Act & assert
-        Analyzer.Should().NotProduceDiagnostics(code);
-    }
-}

CliFx.Analyzers.Tests/Utils/AnalyzerAssertions.cs

@@ -1,174 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Collections.Immutable;
-using System.Linq;
-using System.Text;
-using Basic.Reference.Assemblies;
-using FluentAssertions.Execution;
-using FluentAssertions.Primitives;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.Diagnostics;
-using Microsoft.CodeAnalysis.Text;
-
-namespace CliFx.Analyzers.Tests.Utils;
-
-internal class AnalyzerAssertions : ReferenceTypeAssertions<DiagnosticAnalyzer, AnalyzerAssertions>
-{
-    protected override string Identifier { get; } = "analyzer";
-
-    public AnalyzerAssertions(DiagnosticAnalyzer analyzer)
-        : base(analyzer)
-    {
-    }
-
-    private Compilation Compile(string sourceCode)
-    {
-        // Get default system namespaces
-        var defaultSystemNamespaces = new[]
-        {
-            "System",
-            "System.Collections.Generic",
-            "System.Threading.Tasks"
-        };
-
-        // Get default CliFx namespaces
-        var defaultCliFxNamespaces = typeof(ICommand)
-            .Assembly
-            .GetTypes()
-            .Where(t => t.IsPublic)
-            .Select(t => t.Namespace)
-            .Distinct()
-            .ToArray();
-
-        // Append default imports to the source code
-        var sourceCodeWithUsings =
-            string.Join(Environment.NewLine, defaultSystemNamespaces.Select(n => $"using {n};")) +
-            string.Join(Environment.NewLine, defaultCliFxNamespaces.Select(n => $"using {n};")) +
-            Environment.NewLine +
-            sourceCode;
-
-        // Parse the source code
-        var ast = SyntaxFactory.ParseSyntaxTree(
-            SourceText.From(sourceCodeWithUsings),
-            CSharpParseOptions.Default
-        );
-
-        // Compile the code to IL
-        var compilation = CSharpCompilation.Create(
-            "CliFxTests_DynamicAssembly_" + Guid.NewGuid(),
-            new[] { ast },
-            Net70.References.All
-                .Append(MetadataReference.CreateFromFile(typeof(ICommand).Assembly.Location)),
-            // DLL to avoid having to define the Main() method
-            new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary)
-        );
-
-        var compilationErrors = compilation
-            .GetDiagnostics()
-            .Where(d => d.Severity >= DiagnosticSeverity.Error)
-            .ToArray();
-
-        if (compilationErrors.Any())
-        {
-            throw new InvalidOperationException(
-                $"""
-                Failed to compile code.
-                {string.Join(Environment.NewLine, compilationErrors.Select(e => e.ToString()))}
-                """
-            );
-        }
-
-        return compilation;
-    }
-
-    private IReadOnlyList<Diagnostic> GetProducedDiagnostics(string sourceCode)
-    {
-        var analyzers = ImmutableArray.Create(Subject);
-        var compilation = Compile(sourceCode);
-
-        return compilation
-            .WithAnalyzers(analyzers)
-            .GetAnalyzerDiagnosticsAsync(analyzers, default)
-            .GetAwaiter()
-            .GetResult();
-    }
-
-    public void ProduceDiagnostics(string sourceCode)
-    {
-        var expectedDiagnostics = Subject.SupportedDiagnostics;
-        var producedDiagnostics = GetProducedDiagnostics(sourceCode);
-
-        var expectedDiagnosticIds = expectedDiagnostics.Select(d => d.Id).Distinct().ToArray();
-        var producedDiagnosticIds = producedDiagnostics.Select(d => d.Id).Distinct().ToArray();
-
-        var isSuccessfulAssertion =
-            expectedDiagnosticIds.Intersect(producedDiagnosticIds).Count() ==
-            expectedDiagnosticIds.Length;
-
-        Execute.Assertion.ForCondition(isSuccessfulAssertion).FailWith(() =>
-        {
-            var buffer = new StringBuilder();
-
-            buffer.AppendLine("Expected and produced diagnostics do not match.");
-            buffer.AppendLine();
-
-            buffer.AppendLine("Expected diagnostics:");
-
-            foreach (var expectedDiagnostic in expectedDiagnostics)
-            {
-                buffer.Append("  - ");
-                buffer.Append(expectedDiagnostic.Id);
-                buffer.AppendLine();
-            }
-
-            buffer.AppendLine();
-
-            buffer.AppendLine("Produced diagnostics:");
-
-            if (producedDiagnostics.Any())
-            {
-                foreach (var producedDiagnostic in producedDiagnostics)
-                {
-                    buffer.Append("  - ");
-                    buffer.Append(producedDiagnostic);
-                }
-            }
-            else
-            {
-                buffer.AppendLine("  < none >");
-            }
-
-            return new FailReason(buffer.ToString());
-        });
-    }
-
-    public void NotProduceDiagnostics(string sourceCode)
-    {
-        var producedDiagnostics = GetProducedDiagnostics(sourceCode);
-        var isSuccessfulAssertion = !producedDiagnostics.Any();
-
-        Execute.Assertion.ForCondition(isSuccessfulAssertion).FailWith(() =>
-        {
-            var buffer = new StringBuilder();
-
-            buffer.AppendLine("Expected no produced diagnostics.");
-            buffer.AppendLine();
-
-            buffer.AppendLine("Produced diagnostics:");
-
-            foreach (var producedDiagnostic in producedDiagnostics)
-            {
-                buffer.Append("  - ");
-                buffer.Append(producedDiagnostic);
-            }
-
-            return new FailReason(buffer.ToString());
-        });
-    }
-}
-
-internal static class AnalyzerAssertionsExtensions
-{
-    public static AnalyzerAssertions Should(this DiagnosticAnalyzer analyzer) => new(analyzer);
-}

CliFx.Analyzers.Tests/xunit.runner.json

@@ -1,5 +0,0 @@
-{
-  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
-  "methodDisplayOptions": "all",
-  "methodDisplay": "method"
-}

CliFx.Analyzers/AnalyzerBase.cs

@@ -1,39 +0,0 @@
-using System.Collections.Immutable;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-public abstract class AnalyzerBase : DiagnosticAnalyzer
-{
-    public DiagnosticDescriptor SupportedDiagnostic { get; }
-
-    public sealed override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; }
-
-    protected AnalyzerBase(
-        string diagnosticTitle,
-        string diagnosticMessage,
-        DiagnosticSeverity diagnosticSeverity = DiagnosticSeverity.Error)
-    {
-        SupportedDiagnostic = new DiagnosticDescriptor(
-            "CliFx_" + GetType().Name.TrimEnd("Analyzer"),
-            diagnosticTitle,
-            diagnosticMessage,
-            "CliFx",
-            diagnosticSeverity,
-            true
-        );
-
-        SupportedDiagnostics = ImmutableArray.Create(SupportedDiagnostic);
-    }
-
-    protected Diagnostic CreateDiagnostic(Location location, params object?[]? messageArgs) =>
-        Diagnostic.Create(SupportedDiagnostic, location, messageArgs);
-
-    public override void Initialize(AnalysisContext context)
-    {
-        context.EnableConcurrentExecution();
-        context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
-    }
-}

CliFx.Analyzers/CommandMustBeAnnotatedAnalyzer.cs

@@ -1,55 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class CommandMustBeAnnotatedAnalyzer : AnalyzerBase
-{
-    public CommandMustBeAnnotatedAnalyzer()
-        : base(
-            $"Commands must be annotated with `{SymbolNames.CliFxCommandAttribute}`",
-            $"This type must be annotated with `{SymbolNames.CliFxCommandAttribute}` in order to be a valid command.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        ClassDeclarationSyntax classDeclaration,
-        ITypeSymbol type)
-    {
-        // Ignore abstract classes, because they may be used to define
-        // base implementations for commands, in which case the command
-        // attribute doesn't make sense.
-        if (type.IsAbstract)
-            return;
-
-        var implementsCommandInterface = type
-            .AllInterfaces
-            .Any(i => i.DisplayNameMatches(SymbolNames.CliFxCommandInterface));
-
-        var hasCommandAttribute = type
-            .GetAttributes()
-            .Select(a => a.AttributeClass)
-            .Any(c => c.DisplayNameMatches(SymbolNames.CliFxCommandAttribute));
-
-        // If the interface is implemented, but the attribute is missing,
-        // then it's very likely a user error.
-        if (implementsCommandInterface && !hasCommandAttribute)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(classDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandleClassDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/CommandMustImplementInterfaceAnalyzer.cs

@@ -1,49 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class CommandMustImplementInterfaceAnalyzer : AnalyzerBase
-{
-    public CommandMustImplementInterfaceAnalyzer()
-        : base(
-            $"Commands must implement `{SymbolNames.CliFxCommandInterface}` interface",
-            $"This type must implement `{SymbolNames.CliFxCommandInterface}` interface in order to be a valid command.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        ClassDeclarationSyntax classDeclaration,
-        ITypeSymbol type)
-    {
-        var hasCommandAttribute = type
-            .GetAttributes()
-            .Select(a => a.AttributeClass)
-            .Any(c => c.DisplayNameMatches(SymbolNames.CliFxCommandAttribute));
-
-        var implementsCommandInterface = type
-            .AllInterfaces
-            .Any(i => i.DisplayNameMatches(SymbolNames.CliFxCommandInterface));
-
-        // If the attribute is present, but the interface is not implemented,
-        // it's very likely a user error.
-        if (hasCommandAttribute && !implementsCommandInterface)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(classDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandleClassDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ObjectModel/CommandOptionSymbol.cs

@@ -1,89 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-
-namespace CliFx.Analyzers.ObjectModel;
-
-internal partial class CommandOptionSymbol : ICommandMemberSymbol
-{
-    public IPropertySymbol Property { get; }
-
-    public string? Name { get; }
-
-    public char? ShortName { get; }
-
-    public bool? IsRequired { get; }
-
-    public ITypeSymbol? ConverterType { get; }
-
-    public IReadOnlyList<ITypeSymbol> ValidatorTypes { get; }
-
-    public CommandOptionSymbol(
-        IPropertySymbol property,
-        string? name,
-        char? shortName,
-        bool? isRequired,
-        ITypeSymbol? converterType,
-        IReadOnlyList<ITypeSymbol> validatorTypes)
-    {
-        Property = property;
-        Name = name;
-        ShortName = shortName;
-        IsRequired = isRequired;
-        ConverterType = converterType;
-        ValidatorTypes = validatorTypes;
-    }
-}
-
-internal partial class CommandOptionSymbol
-{
-    private static AttributeData? TryGetOptionAttribute(IPropertySymbol property) => property
-        .GetAttributes()
-        .FirstOrDefault(a => a.AttributeClass?.DisplayNameMatches(SymbolNames.CliFxCommandOptionAttribute) == true);
-
-    public static CommandOptionSymbol? TryResolve(IPropertySymbol property)
-    {
-        var attribute = TryGetOptionAttribute(property);
-        if (attribute is null)
-            return null;
-
-        var name = attribute
-            .ConstructorArguments
-            .Where(a => a.Type?.SpecialType == SpecialType.System_String)
-            .Select(a => a.Value)
-            .FirstOrDefault() as string;
-
-        var shortName = attribute
-            .ConstructorArguments
-            .Where(a => a.Type?.SpecialType == SpecialType.System_Char)
-            .Select(a => a.Value)
-            .FirstOrDefault() as char?;
-
-        var isRequired = attribute
-            .NamedArguments
-            .Where(a => a.Key == "IsRequired")
-            .Select(a => a.Value.Value)
-            .FirstOrDefault() as bool?;
-
-        var converter = attribute
-            .NamedArguments
-            .Where(a => a.Key == "Converter")
-            .Select(a => a.Value.Value)
-            .Cast<ITypeSymbol?>()
-            .FirstOrDefault();
-
-        var validators = attribute
-            .NamedArguments
-            .Where(a => a.Key == "Validators")
-            .SelectMany(a => a.Value.Values)
-            .Select(c => c.Value)
-            .Cast<ITypeSymbol>()
-            .ToArray();
-
-        return new CommandOptionSymbol(property, name, shortName, isRequired, converter, validators);
-    }
-
-    public static bool IsOptionProperty(IPropertySymbol property) =>
-        TryGetOptionAttribute(property) is not null;
-}

CliFx.Analyzers/ObjectModel/CommandParameterSymbol.cs

@@ -1,88 +0,0 @@
-using System.Collections.Generic;
-using System.Linq;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-
-namespace CliFx.Analyzers.ObjectModel;
-
-internal partial class CommandParameterSymbol : ICommandMemberSymbol
-{
-    public IPropertySymbol Property { get; }
-
-    public int Order { get; }
-
-    public string? Name { get; }
-
-    public bool? IsRequired { get; }
-
-    public ITypeSymbol? ConverterType { get; }
-
-    public IReadOnlyList<ITypeSymbol> ValidatorTypes { get; }
-
-    public CommandParameterSymbol(
-        IPropertySymbol property,
-        int order,
-        string? name,
-        bool? isRequired,
-        ITypeSymbol? converterType,
-        IReadOnlyList<ITypeSymbol> validatorTypes)
-    {
-        Property = property;
-        Order = order;
-        Name = name;
-        IsRequired = isRequired;
-        ConverterType = converterType;
-        ValidatorTypes = validatorTypes;
-    }
-}
-
-internal partial class CommandParameterSymbol
-{
-    private static AttributeData? TryGetParameterAttribute(IPropertySymbol property) => property
-        .GetAttributes()
-        .FirstOrDefault(a => a.AttributeClass?.DisplayNameMatches(SymbolNames.CliFxCommandParameterAttribute) == true);
-
-    public static CommandParameterSymbol? TryResolve(IPropertySymbol property)
-    {
-        var attribute = TryGetParameterAttribute(property);
-        if (attribute is null)
-            return null;
-
-        var order = (int)attribute
-            .ConstructorArguments
-            .Select(a => a.Value)
-            .First()!;
-
-        var name = attribute
-            .NamedArguments
-            .Where(a => a.Key == "Name")
-            .Select(a => a.Value.Value)
-            .FirstOrDefault() as string;
-
-        var isRequired = attribute
-            .NamedArguments
-            .Where(a => a.Key == "IsRequired")
-            .Select(a => a.Value.Value)
-            .FirstOrDefault() as bool?;
-
-        var converter = attribute
-            .NamedArguments
-            .Where(a => a.Key == "Converter")
-            .Select(a => a.Value.Value)
-            .Cast<ITypeSymbol?>()
-            .FirstOrDefault();
-
-        var validators = attribute
-            .NamedArguments
-            .Where(a => a.Key == "Validators")
-            .SelectMany(a => a.Value.Values)
-            .Select(c => c.Value)
-            .Cast<ITypeSymbol>()
-            .ToArray();
-
-        return new CommandParameterSymbol(property, order, name, isRequired, converter, validators);
-    }
-
-    public static bool IsParameterProperty(IPropertySymbol property) =>
-        TryGetParameterAttribute(property) is not null;
-}

CliFx.Analyzers/ObjectModel/ICommandMemberSymbol.cs

@@ -1,21 +0,0 @@
-using System.Collections.Generic;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-
-namespace CliFx.Analyzers.ObjectModel;
-
-internal interface ICommandMemberSymbol
-{
-    IPropertySymbol Property { get; }
-
-    ITypeSymbol? ConverterType { get; }
-
-    IReadOnlyList<ITypeSymbol> ValidatorTypes { get; }
-}
-
-internal static class CommandMemberSymbolExtensions
-{
-    public static bool IsScalar(this ICommandMemberSymbol member) =>
-        member.Property.Type.SpecialType == SpecialType.System_String ||
-        member.Property.Type.TryGetEnumerableUnderlyingType() is null;
-}

CliFx.Analyzers/ObjectModel/SymbolNames.cs

@@ -1,12 +0,0 @@
-namespace CliFx.Analyzers.ObjectModel;
-
-internal static class SymbolNames
-{
-    public const string CliFxCommandInterface = "CliFx.ICommand";
-    public const string CliFxCommandAttribute = "CliFx.Attributes.CommandAttribute";
-    public const string CliFxCommandParameterAttribute = "CliFx.Attributes.CommandParameterAttribute";
-    public const string CliFxCommandOptionAttribute = "CliFx.Attributes.CommandOptionAttribute";
-    public const string CliFxConsoleInterface = "CliFx.Infrastructure.IConsole";
-    public const string CliFxBindingConverterClass = "CliFx.Extensibility.BindingConverter<T>";
-    public const string CliFxBindingValidatorClass = "CliFx.Extensibility.BindingValidator<T>";
-}

CliFx.Analyzers/OptionMustBeInsideCommandAnalyzer.cs

@@ -1,52 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustBeInsideCommandAnalyzer : AnalyzerBase
-{
-    public OptionMustBeInsideCommandAnalyzer()
-        : base(
-            "Options must be defined inside commands",
-            $"This option must be defined inside a class that implements `{SymbolNames.CliFxCommandInterface}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        if (property.ContainingType.IsAbstract)
-            return;
-
-        if (!CommandOptionSymbol.IsOptionProperty(property))
-            return;
-
-        var isInsideCommand = property
-            .ContainingType
-            .AllInterfaces
-            .Any(i => i.DisplayNameMatches(SymbolNames.CliFxCommandInterface));
-
-        if (!isInsideCommand)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustBeRequiredIfPropertyRequiredAnalyzer.cs

@@ -1,49 +0,0 @@
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustBeRequiredIfPropertyRequiredAnalyzer : AnalyzerBase
-{
-    public OptionMustBeRequiredIfPropertyRequiredAnalyzer()
-        : base(
-            "Options bound to required properties cannot be marked as non-required",
-            "This option cannot be marked as non-required because it's bound to a required property.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        if (!property.IsRequired)
-            return;
-
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (option.IsRequired != false)
-            return;
-
-        context.ReportDiagnostic(
-            CreateDiagnostic(
-                propertyDeclaration.Identifier.GetLocation()
-            )
-        );
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveNameOrShortNameAnalyzer.cs

@@ -1,41 +0,0 @@
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveNameOrShortNameAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveNameOrShortNameAnalyzer()
-        : base(
-            "Options must have either a name or short name specified",
-            "This option must have either a name or short name specified.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (string.IsNullOrWhiteSpace(option.Name) && option.ShortName is null)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveUniqueNameAnalyzer.cs

@@ -1,72 +0,0 @@
-using System;
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveUniqueNameAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveUniqueNameAnalyzer()
-        : base(
-            "Options must have unique names",
-            "This option's name must be unique within the command (comparison IS NOT case sensitive). " +
-            "Specified name: `{0}`. " +
-            "Property bound to another option with the same name: `{1}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (string.IsNullOrWhiteSpace(option.Name))
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherOption = CommandOptionSymbol.TryResolve(otherProperty);
-            if (otherOption is null)
-                continue;
-
-            if (string.IsNullOrWhiteSpace(otherOption.Name))
-                continue;
-
-            if (string.Equals(option.Name, otherOption.Name, StringComparison.OrdinalIgnoreCase))
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        option.Name,
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveUniqueShortNameAnalyzer.cs

@@ -1,71 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveUniqueShortNameAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveUniqueShortNameAnalyzer()
-        : base(
-            "Options must have unique short names",
-            "This option's short name must be unique within the command (comparison IS case sensitive). " +
-            "Specified short name: `{0}` " +
-            "Property bound to another option with the same short name: `{1}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (option.ShortName is null)
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherOption = CommandOptionSymbol.TryResolve(otherProperty);
-            if (otherOption is null)
-                continue;
-
-            if (otherOption.ShortName is null)
-                continue;
-
-            if (option.ShortName == otherOption.ShortName)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        option.ShortName,
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveValidConverterAnalyzer.cs

@@ -1,62 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveValidConverterAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveValidConverterAnalyzer()
-        : base(
-            $"Option converters must derive from `{SymbolNames.CliFxBindingConverterClass}`",
-            $"Converter specified for this option must derive from a compatible `{SymbolNames.CliFxBindingConverterClass}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (option.ConverterType is null)
-            return;
-
-        var converterValueType = option
-            .ConverterType
-            .GetBaseTypes()
-            .FirstOrDefault(t => t.ConstructedFrom.DisplayNameMatches(SymbolNames.CliFxBindingConverterClass))?
-            .TypeArguments
-            .FirstOrDefault();
-
-        // Value returned by the converter must be assignable to the property type
-        var isCompatible =
-            converterValueType is not null && (option.IsScalar()
-                // Scalar
-                ? context.Compilation.IsAssignable(converterValueType, property.Type)
-                // Non-scalar (assume we can handle all IEnumerable types for simplicity)
-                : property.Type.TryGetEnumerableUnderlyingType() is { } enumerableUnderlyingType &&
-                  context.Compilation.IsAssignable(converterValueType, enumerableUnderlyingType)
-            );
-
-        if (!isCompatible)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveValidNameAnalyzer.cs

@@ -1,48 +0,0 @@
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveValidNameAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveValidNameAnalyzer()
-        : base(
-            "Options must have valid names",
-            "This option's name must be at least 2 characters long and must start with a letter. " +
-            "Specified name: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (string.IsNullOrWhiteSpace(option.Name))
-            return;
-
-        if (option.Name.Length < 2 || !char.IsLetter(option.Name[0]))
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(
-                    propertyDeclaration.Identifier.GetLocation(),
-                    option.Name
-                )
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveValidShortNameAnalyzer.cs

@@ -1,48 +0,0 @@
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveValidShortNameAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveValidShortNameAnalyzer()
-        : base(
-            "Option short names must be letter characters",
-            "This option's short name must be a single letter character. " +
-            "Specified short name: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        if (option.ShortName is null)
-            return;
-
-        if (!char.IsLetter(option.ShortName.Value))
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(
-                    propertyDeclaration.Identifier.GetLocation(),
-                    option.ShortName
-                )
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/OptionMustHaveValidValidatorsAnalyzer.cs

@@ -1,59 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class OptionMustHaveValidValidatorsAnalyzer : AnalyzerBase
-{
-    public OptionMustHaveValidValidatorsAnalyzer()
-        : base(
-            $"Option validators must derive from `{SymbolNames.CliFxBindingValidatorClass}`",
-            $"Each validator specified for this option must derive from a compatible `{SymbolNames.CliFxBindingValidatorClass}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var option = CommandOptionSymbol.TryResolve(property);
-        if (option is null)
-            return;
-
-        foreach (var validatorType in option.ValidatorTypes)
-        {
-            var validatorValueType = validatorType
-                .GetBaseTypes()
-                .FirstOrDefault(t => t.ConstructedFrom.DisplayNameMatches(SymbolNames.CliFxBindingValidatorClass))?
-                .TypeArguments
-                .FirstOrDefault();
-
-            // Value passed to the validator must be assignable from the property type
-            var isCompatible =
-                validatorValueType is not null &&
-                context.Compilation.IsAssignable(property.Type, validatorValueType);
-
-            if (!isCompatible)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-                );
-
-                // No need to report multiple identical diagnostics on the same node
-                break;
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeInsideCommandAnalyzer.cs

@@ -1,52 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeInsideCommandAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeInsideCommandAnalyzer()
-        : base(
-            "Parameters must be defined inside commands",
-            $"This parameter must be defined inside a class that implements `{SymbolNames.CliFxCommandInterface}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        if (property.ContainingType.IsAbstract)
-            return;
-
-        if (!CommandParameterSymbol.IsParameterProperty(property))
-            return;
-
-        var isInsideCommand = property
-            .ContainingType
-            .AllInterfaces
-            .Any(i => i.DisplayNameMatches(SymbolNames.CliFxCommandInterface));
-
-        if (!isInsideCommand)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeLastIfNonRequiredAnalyzer.cs

@@ -1,66 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeLastIfNonRequiredAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeLastIfNonRequiredAnalyzer()
-        : base(
-            "Parameters marked as non-required must be the last in order",
-            "This parameter is non-required so it must be the last in order (its order must be highest within the command). " +
-            "Property bound to another non-required parameter: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.IsRequired != false)
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (otherParameter.Order > parameter.Order)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeLastIfNonScalarAnalyzer.cs

@@ -1,66 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeLastIfNonScalarAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeLastIfNonScalarAnalyzer()
-        : base(
-            "Parameters of non-scalar types must be the last in order",
-            "This parameter has a non-scalar type so it must be the last in order (its order must be highest within the command). " +
-            "Property bound to another non-scalar parameter: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.IsScalar())
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (otherParameter.Order > parameter.Order)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeRequiredIfPropertyRequiredAnalyzer.cs

@@ -1,49 +0,0 @@
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeRequiredIfPropertyRequiredAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeRequiredIfPropertyRequiredAnalyzer()
-        : base(
-            "Parameters bound to required properties cannot be marked as non-required",
-            "This parameter cannot be marked as non-required because it's bound to a required property.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        if (!property.IsRequired)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.IsRequired != false)
-            return;
-
-        context.ReportDiagnostic(
-            CreateDiagnostic(
-                propertyDeclaration.Identifier.GetLocation()
-            )
-        );
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeSingleIfNonRequiredAnalyzer.cs

@@ -1,66 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeSingleIfNonRequiredAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeSingleIfNonRequiredAnalyzer()
-        : base(
-            "Parameters marked as non-required are limited to one per command",
-            "This parameter is non-required so it must be the only such parameter in the command. " +
-            "Property bound to another non-required parameter: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.IsRequired != false)
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (otherParameter.IsRequired == false)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustBeSingleIfNonScalarAnalyzer.cs

@@ -1,66 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustBeSingleIfNonScalarAnalyzer : AnalyzerBase
-{
-    public ParameterMustBeSingleIfNonScalarAnalyzer()
-        : base(
-            "Parameters of non-scalar types are limited to one per command",
-            "This parameter has a non-scalar type so it must be the only such parameter in the command. " +
-            "Property bound to another non-scalar parameter: `{0}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.IsScalar())
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (!otherParameter.IsScalar())
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustHaveUniqueNameAnalyzer.cs

@@ -1,72 +0,0 @@
-using System;
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustHaveUniqueNameAnalyzer : AnalyzerBase
-{
-    public ParameterMustHaveUniqueNameAnalyzer()
-        : base(
-            "Parameters must have unique names",
-            "This parameter's name must be unique within the command (comparison IS NOT case sensitive). " +
-            "Specified name: `{0}`. " +
-            "Property bound to another parameter with the same name: `{1}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (string.IsNullOrWhiteSpace(parameter.Name))
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (string.IsNullOrWhiteSpace(otherParameter.Name))
-                continue;
-
-            if (string.Equals(parameter.Name, otherParameter.Name, StringComparison.OrdinalIgnoreCase))
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        parameter.Name,
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustHaveUniqueOrderAnalyzer.cs

@@ -1,65 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustHaveUniqueOrderAnalyzer : AnalyzerBase
-{
-    public ParameterMustHaveUniqueOrderAnalyzer()
-        : base(
-            "Parameters must have unique order",
-            "This parameter's order must be unique within the command. " +
-            "Specified order: {0}. " +
-            "Property bound to another parameter with the same order: `{1}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        if (property.ContainingType is null)
-            return;
-
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        var otherProperties = property
-            .ContainingType
-            .GetMembers()
-            .OfType<IPropertySymbol>()
-            .Where(m => !m.Equals(property, SymbolEqualityComparer.Default))
-            .ToArray();
-
-        foreach (var otherProperty in otherProperties)
-        {
-            var otherParameter = CommandParameterSymbol.TryResolve(otherProperty);
-            if (otherParameter is null)
-                continue;
-
-            if (parameter.Order == otherParameter.Order)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(
-                        propertyDeclaration.Identifier.GetLocation(),
-                        parameter.Order,
-                        otherProperty.Name
-                    )
-                );
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustHaveValidConverterAnalyzer.cs

@@ -1,62 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustHaveValidConverterAnalyzer : AnalyzerBase
-{
-    public ParameterMustHaveValidConverterAnalyzer()
-        : base(
-            $"Parameter converters must derive from `{SymbolNames.CliFxBindingConverterClass}`",
-            $"Converter specified for this parameter must derive from a compatible `{SymbolNames.CliFxBindingConverterClass}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        if (parameter.ConverterType is null)
-            return;
-
-        var converterValueType = parameter
-            .ConverterType
-            .GetBaseTypes()
-            .FirstOrDefault(t => t.ConstructedFrom.DisplayNameMatches(SymbolNames.CliFxBindingConverterClass))?
-            .TypeArguments
-            .FirstOrDefault();
-
-        // Value returned by the converter must be assignable to the property type
-        var isCompatible =
-            converterValueType is not null && (parameter.IsScalar()
-                // Scalar
-                ? context.Compilation.IsAssignable(converterValueType, property.Type)
-                // Non-scalar (assume we can handle all IEnumerable types for simplicity)
-                : property.Type.TryGetEnumerableUnderlyingType() is { } enumerableUnderlyingType &&
-                  context.Compilation.IsAssignable(converterValueType, enumerableUnderlyingType)
-            );
-
-        if (!isCompatible)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/ParameterMustHaveValidValidatorsAnalyzer.cs

@@ -1,59 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class ParameterMustHaveValidValidatorsAnalyzer : AnalyzerBase
-{
-    public ParameterMustHaveValidValidatorsAnalyzer()
-        : base(
-            $"Parameter validators must derive from `{SymbolNames.CliFxBindingValidatorClass}`",
-            $"Each validator specified for this parameter must derive from a compatible `{SymbolNames.CliFxBindingValidatorClass}`.")
-    {
-    }
-
-    private void Analyze(
-        SyntaxNodeAnalysisContext context,
-        PropertyDeclarationSyntax propertyDeclaration,
-        IPropertySymbol property)
-    {
-        var parameter = CommandParameterSymbol.TryResolve(property);
-        if (parameter is null)
-            return;
-
-        foreach (var validatorType in parameter.ValidatorTypes)
-        {
-            var validatorValueType = validatorType
-                .GetBaseTypes()
-                .FirstOrDefault(t => t.ConstructedFrom.DisplayNameMatches(SymbolNames.CliFxBindingValidatorClass))?
-                .TypeArguments
-                .FirstOrDefault();
-
-            // Value passed to the validator must be assignable from the property type
-            var isCompatible =
-                validatorValueType is not null &&
-                context.Compilation.IsAssignable(property.Type, validatorValueType);
-
-            if (!isCompatible)
-            {
-                context.ReportDiagnostic(
-                    CreateDiagnostic(propertyDeclaration.Identifier.GetLocation())
-                );
-
-                // No need to report multiple identical diagnostics on the same node
-                break;
-            }
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.HandlePropertyDeclaration(Analyze);
-    }
-}

CliFx.Analyzers/SystemConsoleShouldBeAvoidedAnalyzer.cs

@@ -1,79 +0,0 @@
-using System.Linq;
-using CliFx.Analyzers.ObjectModel;
-using CliFx.Analyzers.Utils.Extensions;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers;
-
-[DiagnosticAnalyzer(LanguageNames.CSharp)]
-public class SystemConsoleShouldBeAvoidedAnalyzer : AnalyzerBase
-{
-    public SystemConsoleShouldBeAvoidedAnalyzer()
-        : base(
-            $"Avoid calling `System.Console` where `{SymbolNames.CliFxConsoleInterface}` is available",
-            $"Use the provided `{SymbolNames.CliFxConsoleInterface}` abstraction instead of `System.Console` to ensure that the command can be tested in isolation.",
-            DiagnosticSeverity.Warning)
-    {
-    }
-
-    private MemberAccessExpressionSyntax? TryGetSystemConsoleMemberAccess(
-        SyntaxNodeAnalysisContext context,
-        SyntaxNode node)
-    {
-        var currentNode = node;
-
-        while (currentNode is MemberAccessExpressionSyntax memberAccess)
-        {
-            var member = context.SemanticModel.GetSymbolInfo(memberAccess).Symbol;
-
-            if (member?.ContainingType?.DisplayNameMatches("System.Console") == true)
-            {
-                return memberAccess;
-            }
-
-            // Get inner expression, which may be another member access expression.
-            // Example: System.Console.Error
-            //          ~~~~~~~~~~~~~~          <- inner member access expression
-            //          --------------------    <- outer member access expression
-            currentNode = memberAccess.Expression;
-        }
-
-        return null;
-    }
-
-    private void Analyze(SyntaxNodeAnalysisContext context)
-    {
-        // Try to get a member access on System.Console in the current expression,
-        // or in any of its inner expressions.
-        var systemConsoleMemberAccess = TryGetSystemConsoleMemberAccess(context, context.Node);
-        if (systemConsoleMemberAccess is null)
-            return;
-
-        // Check if IConsole is available in scope as an alternative to System.Console
-        var isConsoleInterfaceAvailable = context
-            .Node
-            .Ancestors()
-            .OfType<MethodDeclarationSyntax>()
-            .SelectMany(m => m.ParameterList.Parameters)
-            .Select(p => p.Type)
-            .Select(t => context.SemanticModel.GetSymbolInfo(t).Symbol)
-            .Where(s => s is not null)
-            .Any(s => s.DisplayNameMatches(SymbolNames.CliFxConsoleInterface));
-
-        if (isConsoleInterfaceAvailable)
-        {
-            context.ReportDiagnostic(
-                CreateDiagnostic(systemConsoleMemberAccess.GetLocation())
-            );
-        }
-    }
-
-    public override void Initialize(AnalysisContext context)
-    {
-        base.Initialize(context);
-        context.RegisterSyntaxNodeAction(Analyze, SyntaxKind.SimpleMemberAccessExpression);
-    }
-}

CliFx.Analyzers/Utils/Extensions/RoslynExtensions.cs

@@ -1,73 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
-using Microsoft.CodeAnalysis.Diagnostics;
-
-namespace CliFx.Analyzers.Utils.Extensions;
-
-internal static class RoslynExtensions
-{
-    public static bool DisplayNameMatches(this ISymbol symbol, string name) =>
-        string.Equals(
-            // Fully qualified name, without `global::`
-            symbol.ToDisplayString(SymbolDisplayFormat.CSharpErrorMessageFormat),
-            name,
-            StringComparison.Ordinal
-        );
-
-    public static IEnumerable<INamedTypeSymbol> GetBaseTypes(this ITypeSymbol type)
-    {
-        var current = type.BaseType;
-
-        while (current is not null)
-        {
-            yield return current;
-            current = current.BaseType;
-        }
-    }
-
-    public static ITypeSymbol? TryGetEnumerableUnderlyingType(this ITypeSymbol type) => type
-        .AllInterfaces
-        .FirstOrDefault(i => i.ConstructedFrom.SpecialType == SpecialType.System_Collections_Generic_IEnumerable_T)?
-        .TypeArguments[0];
-
-    public static bool IsAssignable(this Compilation compilation, ITypeSymbol source, ITypeSymbol destination) =>
-        compilation.ClassifyConversion(source, destination).Exists;
-
-    public static void HandleClassDeclaration(
-        this AnalysisContext analysisContext,
-        Action<SyntaxNodeAnalysisContext, ClassDeclarationSyntax, ITypeSymbol> analyze)
-    {
-        analysisContext.RegisterSyntaxNodeAction(ctx =>
-        {
-            if (ctx.Node is not ClassDeclarationSyntax classDeclaration)
-                return;
-
-            var type = ctx.SemanticModel.GetDeclaredSymbol(classDeclaration);
-            if (type is null)
-                return;
-
-            analyze(ctx, classDeclaration, type);
-        }, SyntaxKind.ClassDeclaration);
-    }
-
-    public static void HandlePropertyDeclaration(
-        this AnalysisContext analysisContext,
-        Action<SyntaxNodeAnalysisContext, PropertyDeclarationSyntax, IPropertySymbol> analyze)
-    {
-        analysisContext.RegisterSyntaxNodeAction(ctx =>
-        {
-            if (ctx.Node is not PropertyDeclarationSyntax propertyDeclaration)
-                return;
-
-            var property = ctx.SemanticModel.GetDeclaredSymbol(propertyDeclaration);
-            if (property is null)
-                return;
-
-            analyze(ctx, propertyDeclaration, property);
-        }, SyntaxKind.PropertyDeclaration);
-    }
-}

CliFx.Analyzers/Utils/Extensions/StringExtensions.cs

@@ -1,17 +0,0 @@
-using System;
-
-namespace CliFx.Analyzers.Utils.Extensions;
-
-internal static class StringExtensions
-{
-    public static string TrimEnd(
-        this string str,
-        string sub,
-        StringComparison comparison = StringComparison.Ordinal)
-    {
-        while (str.EndsWith(sub, comparison))
-            str = str[..^sub.Length];
-
-        return str;
-    }
-}

CliFx.Benchmarks/Benchmarks.Clipr.cs

@@ -16,9 +16,7 @@ public partial class Benchmarks
         [NamedArgument('b', "bool", Constraint = NumArgsConstraint.Optional, Const = true)]
         public bool BoolOption { get; set; }
 
-        public void Execute()
-        {
-        }
+        public void Execute() { }
     }
 
     [Benchmark(Description = "Clipr")]

CliFx.Benchmarks/Benchmarks.Cocona.cs

@@ -8,14 +8,10 @@ public partial class Benchmarks
     public class CoconaCommand
     {
         public void Execute(
-            [Option("str", new []{'s'})]
-            string? strOption,
-            [Option("int", new []{'i'})]
-            int intOption,
-            [Option("bool", new []{'b'})]
-            bool boolOption)
-        {
-        }
+            [Option("str", ['s'])] string? strOption,
+            [Option("int", ['i'])] int intOption,
+            [Option("bool", ['b'])] bool boolOption
+        ) { }
     }
 
     [Benchmark(Description = "Cocona")]

CliFx.Benchmarks/Benchmarks.CommandLineParser.cs

@@ -16,9 +16,7 @@ public partial class Benchmarks
         [Option('b', "bool")]
         public bool BoolOption { get; set; }
 
-        public void Execute()
-        {
-        }
+        public void Execute() { }
     }
 
     [Benchmark(Description = "CommandLineParser")]

CliFx.Benchmarks/Benchmarks.PowerArgs.cs

@@ -16,9 +16,7 @@ public partial class Benchmarks
         [ArgShortcut("--bool"), ArgShortcut("-b")]
         public bool BoolOption { get; set; }
 
-        public void Main()
-        {
-        }
+        public void Main() { }
     }
 
     [Benchmark(Description = "PowerArgs")]

CliFx.Benchmarks/Benchmarks.SystemCommandLine.cs

@@ -1,5 +1,4 @@
 using System.CommandLine;
-using System.CommandLine.Invocation;
 using System.Threading.Tasks;
 using BenchmarkDotNet.Attributes;
 
@@ -9,29 +8,20 @@ public partial class Benchmarks
 {
     public class SystemCommandLineCommand
     {
-        public static int ExecuteHandler(string s, int i, bool b) => 0;
+        public static void ExecuteHandler(string s, int i, bool b) { }
 
         public Task<int> ExecuteAsync(string[] args)
         {
-            var command = new RootCommand
-            {
-                new Option(new[] {"--str", "-s"})
-                {
-                    Argument = new Argument<string?>()
-                },
-                new Option(new[] {"--int", "-i"})
-                {
-                    Argument = new Argument<int>()
-                },
-                new Option(new[] {"--bool", "-b"})
-                {
-                    Argument = new Argument<bool>()
-                }
-            };
+            var stringOption = new Option<string>(["--str", "-s"]);
+            var intOption = new Option<int>(["--int", "-i"]);
+            var boolOption = new Option<bool>(["--bool", "-b"]);
 
-            command.Handler = CommandHandler.Create(
-                typeof(SystemCommandLineCommand).GetMethod(nameof(ExecuteHandler))!
-            );
+            var command = new RootCommand();
+            command.AddOption(stringOption);
+            command.AddOption(intOption);
+            command.AddOption(boolOption);
+
+            command.SetHandler(ExecuteHandler, stringOption, intOption, boolOption);
 
             return command.InvokeAsync(args);
         }

CliFx.Benchmarks/Benchmarks.cs

@@ -9,11 +9,10 @@ namespace CliFx.Benchmarks;
 [Orderer(SummaryOrderPolicy.FastestToSlowest)]
 public partial class Benchmarks
 {
-    private static readonly string[] Arguments = {"--str", "hello world", "-i", "13", "-b"};
+    private static readonly string[] Arguments = ["--str", "hello world", "-i", "13", "-b"];
 
-    public static void Main() => BenchmarkRunner.Run<Benchmarks>(
-        DefaultConfig
-            .Instance
-            .WithOptions(ConfigOptions.DisableOptimizationsValidator)
+    public static void Main() =>
+        BenchmarkRunner.Run<Benchmarks>(
+            DefaultConfig.Instance.WithOptions(ConfigOptions.DisableOptimizationsValidator)
         );
 }

CliFx.Benchmarks/CliFx.Benchmarks.csproj

@@ -2,17 +2,19 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
+    <NuGetAudit>false</NuGetAudit>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.5" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageReference Include="clipr" Version="1.6.1" />
     <PackageReference Include="Cocona" Version="2.2.0" />
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
-    <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.0.2" />
-    <PackageReference Include="PowerArgs" Version="4.0.2" />
-    <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.20574.7" />
+    <PackageReference Include="CSharpier.MsBuild" Version="0.30.6" PrivateAssets="all" />
+    <PackageReference Include="McMaster.Extensions.CommandLineUtils" Version="4.1.1" />
+    <PackageReference Include="PowerArgs" Version="4.0.3" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>
 
   <ItemGroup>

CliFx.Demo/CliFx.Demo.csproj

@@ -2,16 +2,19 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
+    <ApplicationIcon>../favicon.ico</ApplicationIcon>
+    <PublishAot>true</PublishAot>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
+    <PackageReference Include="CSharpier.MsBuild" Version="0.30.6" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.1" />
   </ItemGroup>
 
   <ItemGroup>
     <ProjectReference Include="..\CliFx\CliFx.csproj" />
-    <ProjectReference Include="..\CliFx.Analyzers\CliFx.Analyzers.csproj" ReferenceOutputAssembly="false" OutputItemType="analyzer" />
+    <ProjectReference Include="..\CliFx.SourceGeneration\CliFx.SourceGeneration.csproj" ReferenceOutputAssembly="false" OutputItemType="analyzer" />
   </ItemGroup>
 
 </Project>

CliFx.Demo/Commands/BookAddCommand.cs

@@ -8,62 +8,48 @@ using CliFx.Infrastructure;
 
 namespace CliFx.Demo.Commands;
 
-[Command("book add", Description = "Add a book to the library.")]
-public partial class BookAddCommand : ICommand
+[Command("book add", Description = "Adds a book to the library.")]
+public class BookAddCommand(LibraryProvider libraryProvider) : ICommand
 {
-    private readonly LibraryProvider _libraryProvider;
-
     [CommandParameter(0, Name = "title", Description = "Book title.")]
     public required string Title { get; init; }
 
-    [CommandOption("author", 'a', IsRequired = true, Description = "Book author.")]
+    [CommandOption("author", 'a', Description = "Book author.")]
     public required string Author { get; init; }
 
     [CommandOption("published", 'p', Description = "Book publish date.")]
-    public DateTimeOffset Published { get; init; } = CreateRandomDate();
+    public DateTimeOffset Published { get; init; } =
+        new(
+            Random.Shared.Next(1800, 2020),
+            Random.Shared.Next(1, 12),
+            Random.Shared.Next(1, 28),
+            Random.Shared.Next(1, 23),
+            Random.Shared.Next(1, 59),
+            Random.Shared.Next(1, 59),
+            TimeSpan.Zero
+        );
 
     [CommandOption("isbn", 'n', Description = "Book ISBN.")]
-    public Isbn Isbn { get; init; } = CreateRandomIsbn();
-
-    public BookAddCommand(LibraryProvider libraryProvider)
-    {
-        _libraryProvider = libraryProvider;
-    }
+    public Isbn Isbn { get; init; } =
+        new(
+            Random.Shared.Next(0, 999),
+            Random.Shared.Next(0, 99),
+            Random.Shared.Next(0, 99999),
+            Random.Shared.Next(0, 99),
+            Random.Shared.Next(0, 9)
+        );
 
     public ValueTask ExecuteAsync(IConsole console)
     {
-        if (_libraryProvider.TryGetBook(Title) is not null)
-            throw new CommandException("Book already exists.", 10);
+        if (libraryProvider.TryGetBook(Title) is not null)
+            throw new CommandException($"Book '{Title}' already exists.", 10);
 
         var book = new Book(Title, Author, Published, Isbn);
-        _libraryProvider.AddBook(book);
+        libraryProvider.AddBook(book);
 
-        console.Output.WriteLine("Book added.");
-        console.Output.WriteBook(book);
+        console.WriteLine($"Book '{Title}' added.");
+        console.WriteBook(book);
 
         return default;
     }
 }
-
-public partial class BookAddCommand
-{
-    private static readonly Random Random = new();
-
-    private static DateTimeOffset CreateRandomDate() => new(
-        Random.Next(1800, 2020),
-        Random.Next(1, 12),
-        Random.Next(1, 28),
-        Random.Next(1, 23),
-        Random.Next(1, 59),
-        Random.Next(1, 59),
-        TimeSpan.Zero
-    );
-
-    private static Isbn CreateRandomIsbn() => new(
-        Random.Next(0, 999),
-        Random.Next(0, 99),
-        Random.Next(0, 99999),
-        Random.Next(0, 99),
-        Random.Next(0, 9)
-    );
-}

CliFx.Demo/Commands/BookCommand.cs

@@ -7,27 +7,20 @@ using CliFx.Infrastructure;
 
 namespace CliFx.Demo.Commands;
 
-[Command("book", Description = "Retrieve a book from the library.")]
-public class BookCommand : ICommand
+[Command("book", Description = "Retrieves a book from the library.")]
+public class BookCommand(LibraryProvider libraryProvider) : ICommand
 {
-    private readonly LibraryProvider _libraryProvider;
-
     [CommandParameter(0, Name = "title", Description = "Title of the book to retrieve.")]
     public required string Title { get; init; }
 
-    public BookCommand(LibraryProvider libraryProvider)
-    {
-        _libraryProvider = libraryProvider;
-    }
-
     public ValueTask ExecuteAsync(IConsole console)
     {
-        var book = _libraryProvider.TryGetBook(Title);
+        var book = libraryProvider.TryGetBook(Title);
 
         if (book is null)
-            throw new CommandException("Book not found.", 10);
+            throw new CommandException($"Book '{Title}' not found.", 10);
 
-        console.Output.WriteBook(book);
+        console.WriteBook(book);
 
         return default;
     }

CliFx.Demo/Commands/BookListCommand.cs

@@ -6,29 +6,22 @@ using CliFx.Infrastructure;
 
 namespace CliFx.Demo.Commands;
 
-[Command("book list", Description = "List all books in the library.")]
-public class BookListCommand : ICommand
+[Command("book list", Description = "Lists all books in the library.")]
+public class BookListCommand(LibraryProvider libraryProvider) : ICommand
 {
-    private readonly LibraryProvider _libraryProvider;
-
-    public BookListCommand(LibraryProvider libraryProvider)
-    {
-        _libraryProvider = libraryProvider;
-    }
-
     public ValueTask ExecuteAsync(IConsole console)
     {
-        var library = _libraryProvider.GetLibrary();
+        var library = libraryProvider.GetLibrary();
 
         for (var i = 0; i < library.Books.Count; i++)
         {
             // Add margin
             if (i != 0)
-                console.Output.WriteLine();
+                console.WriteLine();
 
             // Render book
             var book = library.Books[i];
-            console.Output.WriteBook(book);
+            console.WriteBook(book);
         }
 
         return default;

CliFx.Demo/Commands/BookRemoveCommand.cs

@@ -6,29 +6,22 @@ using CliFx.Infrastructure;
 
 namespace CliFx.Demo.Commands;
 
-[Command("book remove", Description = "Remove a book from the library.")]
-public class BookRemoveCommand : ICommand
+[Command("book remove", Description = "Removes a book from the library.")]
+public class BookRemoveCommand(LibraryProvider libraryProvider) : ICommand
 {
-    private readonly LibraryProvider _libraryProvider;
-
     [CommandParameter(0, Name = "title", Description = "Title of the book to remove.")]
     public required string Title { get; init; }
 
-    public BookRemoveCommand(LibraryProvider libraryProvider)
-    {
-        _libraryProvider = libraryProvider;
-    }
-
     public ValueTask ExecuteAsync(IConsole console)
     {
-        var book = _libraryProvider.TryGetBook(Title);
+        var book = libraryProvider.TryGetBook(Title);
 
         if (book is null)
-            throw new CommandException("Book not found.", 10);
+            throw new CommandException($"Book '{Title}' not found.", 10);
 
-        _libraryProvider.RemoveBook(book);
+        libraryProvider.RemoveBook(book);
 
-        console.Output.WriteLine($"Book {Title} removed.");
+        console.WriteLine($"Book '{Title}' removed.");
 
         return default;
     }

CliFx.Demo/Domain/Isbn.cs

@@ -2,7 +2,13 @@
 
 namespace CliFx.Demo.Domain;
 
-public partial record Isbn(int EanPrefix, int RegistrationGroup, int Registrant, int Publication, int CheckDigit)
+public partial record Isbn(
+    int EanPrefix,
+    int RegistrationGroup,
+    int Registrant,
+    int Publication,
+    int CheckDigit
+)
 {
     public override string ToString() =>
         $"{EanPrefix:000}-{RegistrationGroup:00}-{Registrant:00000}-{Publication:00}-{CheckDigit:0}";

CliFx.Demo/Domain/Library.cs

@@ -1,5 +1,4 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Linq;
 
 namespace CliFx.Demo.Domain;
@@ -24,5 +23,5 @@ public partial record Library(IReadOnlyList<Book> Books)
 
 public partial record Library
 {
-    public static Library Empty { get; } = new(Array.Empty<Book>());
+    public static Library Empty { get; } = new([]);
 }

CliFx.Demo/Domain/LibraryJsonContext.cs

@@ -0,0 +1,6 @@
+using System.Text.Json.Serialization;
+
+namespace CliFx.Demo.Domain;
+
+[JsonSerializable(typeof(Library))]
+public partial class LibraryJsonContext : JsonSerializerContext;

CliFx.Demo/Domain/LibraryProvider.cs

@@ -6,11 +6,12 @@ namespace CliFx.Demo.Domain;
 
 public class LibraryProvider
 {
-    private static string StorageFilePath { get; } = Path.Combine(Directory.GetCurrentDirectory(), "Library.json");
+    private static string StorageFilePath { get; } =
+        Path.Combine(Directory.GetCurrentDirectory(), "Library.json");
 
     private void StoreLibrary(Library library)
     {
-        var data = JsonSerializer.Serialize(library);
+        var data = JsonSerializer.Serialize(library, LibraryJsonContext.Default.Library);
         File.WriteAllText(StorageFilePath, data);
     }
 
@@ -21,10 +22,12 @@ public class LibraryProvider
 
         var data = File.ReadAllText(StorageFilePath);
 
-        return JsonSerializer.Deserialize<Library>(data) ?? Library.Empty;
+        return JsonSerializer.Deserialize(data, LibraryJsonContext.Default.Library)
+            ?? Library.Empty;
     }
 
-    public Book? TryGetBook(string title) => GetLibrary().Books.FirstOrDefault(b => b.Title == title);
+    public Book? TryGetBook(string title) =>
+        GetLibrary().Books.FirstOrDefault(b => b.Title == title);
 
     public void AddBook(Book book)
     {

CliFx.Demo/Program.cs

@@ -1,25 +1,18 @@
 using CliFx;
-using CliFx.Demo.Commands;
 using CliFx.Demo.Domain;
 using Microsoft.Extensions.DependencyInjection;
 
 // We use Microsoft.Extensions.DependencyInjection for injecting dependencies in commands
 var services = new ServiceCollection();
-
-// Register services
 services.AddSingleton<LibraryProvider>();
 
-// Register commands
-services.AddTransient<BookCommand>();
-services.AddTransient<BookAddCommand>();
-services.AddTransient<BookRemoveCommand>();
-services.AddTransient<BookListCommand>();
-
-var serviceProvider = services.BuildServiceProvider();
+// Register all commands as transient services
+foreach (var commandType in commandTypes)
+    services.AddTransient(commandType);
 
 return await new CliApplicationBuilder()
     .SetDescription("Demo application showcasing CliFx features.")
     .AddCommandsFromThisAssembly()
-    .UseTypeActivator(serviceProvider.GetRequiredService)
+    .UseTypeActivator(services.BuildServiceProvider())
     .Build()
     .RunAsync();

CliFx.Demo/Utils/ConsoleExtensions.cs

@@ -33,4 +33,7 @@ internal static class ConsoleExtensions
         using (writer.Console.WithForegroundColor(ConsoleColor.White))
             writer.WriteLine(book.Isbn);
     }
+
+    public static void WriteBook(this IConsole console, Book book) =>
+        console.Output.WriteBook(book);
 }

CliFx.SourceGeneration/CliFx.SourceGeneration.csproj

@@ -5,7 +5,7 @@
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
     <GenerateDependencyFile>true</GenerateDependencyFile>
     <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
-    <NoWarn>$(NoWarn);RS1025;RS1026</NoWarn>
+    <NoWarn>$(NoWarn);RS1035</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -17,9 +17,11 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" PrivateAssets="all" />
-    <PackageReference Include="PolyShim" Version="1.1.0" PrivateAssets="all" />
+    <PackageReference Include="CSharpier.MsBuild" Version="0.28.2" PrivateAssets="all" />
+    <!-- Make sure to target the lowest possible version of the compiler for wider support -->
+    <PackageReference Include="Microsoft.CodeAnalysis" Version="4.11.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" PrivateAssets="all" />
+    <PackageReference Include="PolyShim" Version="1.12.0" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>

CliFx.SourceGeneration/CommandSchemaGenerator.cs

@@ -0,0 +1,130 @@
+using System.Linq;
+using CliFx.SourceGeneration.SemanticModel;
+using CliFx.SourceGeneration.Utils.Extensions;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace CliFx.SourceGeneration;
+
+[Generator]
+public class CommandSchemaGenerator : IIncrementalGenerator
+{
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        var values = context.SyntaxProvider.ForAttributeWithMetadataName<(
+            CommandSymbol?,
+            Diagnostic?
+        )>(
+            KnownSymbolNames.CliFxCommandAttribute,
+            (n, _) => n is TypeDeclarationSyntax,
+            (x, _) =>
+            {
+                // Predicate above ensures that these casts are safe
+                var commandTypeSyntax = (TypeDeclarationSyntax)x.TargetNode;
+                var commandTypeSymbol = (INamedTypeSymbol)x.TargetSymbol;
+
+                // Check if the target type and all its containing types are partial
+                if (
+                    commandTypeSyntax
+                        .AncestorsAndSelf()
+                        .Any(a =>
+                            a is TypeDeclarationSyntax t
+                            && !t.Modifiers.Any(m => m.IsKind(SyntaxKind.PartialKeyword))
+                        )
+                )
+                {
+                    return (
+                        null,
+                        Diagnostic.Create(
+                            DiagnosticDescriptors.CommandMustBePartial,
+                            commandTypeSyntax.Identifier.GetLocation()
+                        )
+                    );
+                }
+
+                // Check if the target type implements ICommand
+                var hasCommandInterface = commandTypeSymbol.AllInterfaces.Any(i =>
+                    i.DisplayNameMatches(KnownSymbolNames.CliFxCommandInterface)
+                );
+
+                if (!hasCommandInterface)
+                {
+                    return (
+                        null,
+                        Diagnostic.Create(
+                            DiagnosticDescriptors.CommandMustImplementInterface,
+                            commandTypeSymbol.Locations.First()
+                        )
+                    );
+                }
+
+                // Resolve the command
+                var commandAttribute = x.Attributes.First(a =>
+                    a.AttributeClass?.DisplayNameMatches(KnownSymbolNames.CliFxCommandAttribute)
+                    == true
+                );
+
+                var command = CommandSymbol.FromSymbol(commandTypeSymbol, commandAttribute);
+
+                // TODO: validate command
+
+                return (command, null);
+            }
+        );
+
+        // Report diagnostics
+        var diagnostics = values.Select((v, _) => v.Item2).WhereNotNull();
+        context.RegisterSourceOutput(diagnostics, (x, d) => x.ReportDiagnostic(d));
+
+        // Generate command schemas
+        var symbols = values.Select((v, _) => v.Item1).WhereNotNull();
+        context.RegisterSourceOutput(
+            symbols,
+            (x, c) =>
+                x.AddSource(
+                    $"{c.Type.FullyQualifiedName}.CommandSchema.Generated.cs",
+                    // lang=csharp
+                    $$"""
+                    namespace {{c.Type.Namespace}};
+
+                    partial class {{c.Type.Name}}
+                    {
+                        public static CliFx.Schema.CommandSchema<{{c.Type.FullyQualifiedName}}> Schema { get; } = {{c.GenerateSchemaInitializationCode()}};
+                    }
+                    """
+                )
+        );
+
+        // Generate extension methods
+        var symbolsCollected = symbols.Collect();
+        context.RegisterSourceOutput(
+            symbolsCollected,
+            (x, cs) =>
+                x.AddSource(
+                    "CommandSchemaExtensions.Generated.cs",
+                    // lang=csharp
+                    $$"""
+                  namespace CliFx;
+
+                  static partial class GeneratedExtensions
+                  {
+                      public static CliFx.CliApplicationBuilder AddCommandsFromThisAssembly(this CliFx.CliApplicationBuilder builder)
+                      {
+                          {{
+                              cs.Select(c => c.Type.FullyQualifiedName)
+                                  .Select(t =>
+                                      // lang=csharp
+                                      $"builder.AddCommand({t}.Schema);"
+                                  )
+                                  .JoinToString("\n")
+                          }}
+                          
+                          return builder;
+                      }
+                  }
+                  """
+                )
+        );
+    }
+}

CliFx.SourceGeneration/DiagnosticDescriptors.cs

@@ -0,0 +1,27 @@
+using CliFx.SourceGeneration.SemanticModel;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration;
+
+internal static class DiagnosticDescriptors
+{
+    public static DiagnosticDescriptor CommandMustBePartial { get; } =
+        new(
+            $"{nameof(CliFx)}_{nameof(CommandMustBePartial)}",
+            "Command types must be declared as `partial`",
+            "This type (and all its containing types, if present) must be declared as `partial` in order to be a valid command.",
+            "CliFx",
+            DiagnosticSeverity.Error,
+            true
+        );
+
+    public static DiagnosticDescriptor CommandMustImplementInterface { get; } =
+        new(
+            $"{nameof(CliFx)}_{nameof(CommandMustImplementInterface)}",
+            $"Commands must implement the `{KnownSymbolNames.CliFxCommandInterface}` interface",
+            $"This type must implement the `{KnownSymbolNames.CliFxCommandInterface}` interface in order to be a valid command.",
+            "CliFx",
+            DiagnosticSeverity.Error,
+            true
+        );
+}

CliFx.SourceGeneration/SemanticModel/CommandInputSymbol.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal abstract partial class CommandInputSymbol(
+    PropertyDescriptor property,
+    bool isSequence,
+    string? description,
+    TypeDescriptor? converterType,
+    IReadOnlyList<TypeDescriptor> validatorTypes
+)
+{
+    public PropertyDescriptor Property { get; } = property;
+
+    public bool IsSequence { get; } = isSequence;
+
+    public string? Description { get; } = description;
+
+    public TypeDescriptor? ConverterType { get; } = converterType;
+
+    public IReadOnlyList<TypeDescriptor> ValidatorTypes { get; } = validatorTypes;
+}
+
+internal partial class CommandInputSymbol : IEquatable<CommandInputSymbol>
+{
+    public bool Equals(CommandInputSymbol? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return Property.Equals(other.Property)
+            && IsSequence == other.IsSequence
+            && Description == other.Description
+            && Equals(ConverterType, other.ConverterType)
+            && ValidatorTypes.SequenceEqual(other.ValidatorTypes);
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((CommandInputSymbol)obj);
+    }
+
+    public override int GetHashCode() =>
+        HashCode.Combine(Property, IsSequence, Description, ConverterType, ValidatorTypes);
+}
+
+internal partial class CommandInputSymbol
+{
+    public static bool IsSequenceType(ITypeSymbol type) =>
+        type.AllInterfaces.Any(i =>
+            i.SpecialType == SpecialType.System_Collections_Generic_IEnumerable_T
+        )
+        && type.SpecialType != SpecialType.System_String;
+}

CliFx.SourceGeneration/SemanticModel/CommandOptionSymbol.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CliFx.SourceGeneration.Utils.Extensions;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal partial class CommandOptionSymbol(
+    PropertyDescriptor property,
+    bool isSequence,
+    string? name,
+    char? shortName,
+    string? environmentVariable,
+    bool isRequired,
+    string? description,
+    TypeDescriptor? converterType,
+    IReadOnlyList<TypeDescriptor> validatorTypes
+) : CommandInputSymbol(property, isSequence, description, converterType, validatorTypes)
+{
+    public string? Name { get; } = name;
+
+    public char? ShortName { get; } = shortName;
+
+    public string? EnvironmentVariable { get; } = environmentVariable;
+
+    public bool IsRequired { get; } = isRequired;
+}
+
+internal partial class CommandOptionSymbol : IEquatable<CommandOptionSymbol>
+{
+    public bool Equals(CommandOptionSymbol? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return base.Equals(other)
+            && Name == other.Name
+            && ShortName == other.ShortName
+            && EnvironmentVariable == other.EnvironmentVariable
+            && IsRequired == other.IsRequired;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((CommandOptionSymbol)obj);
+    }
+
+    public override int GetHashCode() =>
+        HashCode.Combine(base.GetHashCode(), Name, ShortName, EnvironmentVariable, IsRequired);
+}
+
+internal partial class CommandOptionSymbol
+{
+    public static CommandOptionSymbol FromSymbol(
+        IPropertySymbol property,
+        AttributeData attribute
+    ) =>
+        new(
+            PropertyDescriptor.FromSymbol(property),
+            IsSequenceType(property.Type),
+            attribute
+                .ConstructorArguments.FirstOrDefault(a =>
+                    a.Type?.SpecialType == SpecialType.System_String
+                )
+                .Value as string,
+            attribute
+                .ConstructorArguments.FirstOrDefault(a =>
+                    a.Type?.SpecialType == SpecialType.System_Char
+                )
+                .Value as char?,
+            attribute.GetNamedArgumentValue("EnvironmentVariable", default(string)),
+            attribute.GetNamedArgumentValue("IsRequired", property.IsRequired),
+            attribute.GetNamedArgumentValue("Description", default(string)),
+            TypeDescriptor.FromSymbol(attribute.GetNamedArgumentValue<ITypeSymbol?>("Converter")),
+            attribute
+                .GetNamedArgumentValues<ITypeSymbol>("Validators")
+                .Select(TypeDescriptor.FromSymbol)
+                .ToArray()
+        );
+}

CliFx.SourceGeneration/SemanticModel/CommandParameterSymbol.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CliFx.SourceGeneration.Utils.Extensions;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal partial class CommandParameterSymbol(
+    PropertyDescriptor property,
+    bool isSequence,
+    int order,
+    string name,
+    bool isRequired,
+    string? description,
+    TypeDescriptor? converterType,
+    IReadOnlyList<TypeDescriptor> validatorTypes
+) : CommandInputSymbol(property, isSequence, description, converterType, validatorTypes)
+{
+    public int Order { get; } = order;
+
+    public string Name { get; } = name;
+
+    public bool IsRequired { get; } = isRequired;
+}
+
+internal partial class CommandParameterSymbol : IEquatable<CommandParameterSymbol>
+{
+    public bool Equals(CommandParameterSymbol? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return base.Equals(other)
+            && Order == other.Order
+            && Name == other.Name
+            && IsRequired == other.IsRequired;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((CommandParameterSymbol)obj);
+    }
+
+    public override int GetHashCode() =>
+        HashCode.Combine(base.GetHashCode(), Order, Name, IsRequired);
+}
+
+internal partial class CommandParameterSymbol
+{
+    public static CommandParameterSymbol FromSymbol(
+        IPropertySymbol property,
+        AttributeData attribute
+    ) =>
+        new(
+            PropertyDescriptor.FromSymbol(property),
+            IsSequenceType(property.Type),
+            (int)attribute.ConstructorArguments.First().Value!,
+            attribute.GetNamedArgumentValue("Name", default(string)),
+            attribute.GetNamedArgumentValue("IsRequired", true),
+            attribute.GetNamedArgumentValue("Description", default(string)),
+            TypeDescriptor.FromSymbol(attribute.GetNamedArgumentValue<ITypeSymbol>("Converter")),
+            attribute
+                .GetNamedArgumentValues<ITypeSymbol>("Validators")
+                .Select(TypeDescriptor.FromSymbol)
+                .ToArray()
+        );
+}

CliFx.SourceGeneration/SemanticModel/CommandSymbol.cs

@@ -0,0 +1,167 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CliFx.SourceGeneration.Utils.Extensions;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal partial class CommandSymbol(
+    TypeDescriptor type,
+    string? name,
+    string? description,
+    IReadOnlyList<CommandInputSymbol> inputs
+)
+{
+    public TypeDescriptor Type { get; } = type;
+
+    public string? Name { get; } = name;
+
+    public string? Description { get; } = description;
+
+    public IReadOnlyList<CommandInputSymbol> Inputs { get; } = inputs;
+
+    public IReadOnlyList<CommandParameterSymbol> Parameters =>
+        Inputs.OfType<CommandParameterSymbol>().ToArray();
+
+    public IReadOnlyList<CommandOptionSymbol> Options =>
+        Inputs.OfType<CommandOptionSymbol>().ToArray();
+
+    private string GeneratePropertyBindingInitializationCode(PropertyDescriptor property) =>
+        // lang=csharp
+        $$"""
+            new CliFx.Schema.PropertyBinding<{{Type.FullyQualifiedName}}, {{property
+                .Type
+                .FullyQualifiedName}}>(
+                (obj) => obj.{{property.Name}},
+                (obj, value) => obj.{{property.Name}} = value
+            )
+            """;
+
+    private string GenerateSchemaInitializationCode(CommandInputSymbol input) =>
+        input switch
+        {
+            CommandParameterSymbol parameter
+                =>
+                // lang=csharp
+                $$"""
+                    new CliFx.Schema.CommandParameterSchema<{{Type.FullyQualifiedName}}, {{parameter
+                        .Property
+                        .Type
+                        .FullyQualifiedName}}>(
+                        {{GeneratePropertyBindingInitializationCode(parameter.Property)}},
+                        {{parameter.IsSequence}},
+                        {{parameter.Order}},
+                        "{{parameter.Name}}",
+                        {{parameter.IsRequired}},
+                        "{{parameter.Description}}",
+                        // TODO,
+                        // TODO
+                    );
+                    """,
+            CommandOptionSymbol option
+                =>
+                // lang=csharp
+                $$"""
+                    new CliFx.Schema.CommandOptionSchema<{{Type.FullyQualifiedName}}, {{option
+                        .Property
+                        .Type
+                        .FullyQualifiedName}}>(
+                        {{GeneratePropertyBindingInitializationCode(option.Property)}},
+                        {{option.IsSequence}},
+                        "{{option.Name}}",
+                        '{{option.ShortName}}',
+                        "{{option.EnvironmentVariable}}",
+                        {{option.IsRequired}},
+                        "{{option.Description}}",
+                        // TODO,
+                        // TODO
+                    );
+                    """,
+            _ => throw new ArgumentOutOfRangeException(nameof(input), input, null)
+        };
+
+    public string GenerateSchemaInitializationCode() =>
+            // lang=csharp
+            $$"""
+            new CliFx.Schema.CommandSchema<{{Type.FullyQualifiedName}}>(
+                "{{Name}}",
+                "{{Description}}",
+                new CliFx.Schema.CommandInputSchema[]
+                {
+                    {{Inputs.Select(GenerateSchemaInitializationCode).JoinToString(",\n")}}
+                }
+            )
+            """;
+}
+
+internal partial class CommandSymbol : IEquatable<CommandSymbol>
+{
+    public bool Equals(CommandSymbol? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return Type.Equals(other.Type)
+            && Name == other.Name
+            && Description == other.Description
+            && Inputs.SequenceEqual(other.Inputs);
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((CommandSymbol)obj);
+    }
+
+    public override int GetHashCode() => HashCode.Combine(Type, Name, Description, Inputs);
+}
+
+internal partial class CommandSymbol
+{
+    public static CommandSymbol FromSymbol(INamedTypeSymbol symbol, AttributeData attribute)
+    {
+        var inputs = new List<CommandInputSymbol>();
+        foreach (var property in symbol.GetMembers().OfType<IPropertySymbol>())
+        {
+            var parameterAttribute = property
+                .GetAttributes()
+                .FirstOrDefault(a =>
+                    a.AttributeClass?.Name == KnownSymbolNames.CliFxCommandParameterAttribute
+                );
+
+            if (parameterAttribute is not null)
+            {
+                inputs.Add(CommandParameterSymbol.FromSymbol(property, parameterAttribute));
+                continue;
+            }
+
+            var optionAttribute = property
+                .GetAttributes()
+                .FirstOrDefault(a =>
+                    a.AttributeClass?.Name == KnownSymbolNames.CliFxCommandOptionAttribute
+                );
+
+            if (optionAttribute is not null)
+            {
+                inputs.Add(CommandOptionSymbol.FromSymbol(property, optionAttribute));
+                continue;
+            }
+        }
+
+        return new CommandSymbol(
+            TypeDescriptor.FromSymbol(symbol),
+            attribute.ConstructorArguments.FirstOrDefault().Value as string,
+            attribute.GetNamedArgumentValue("Description", default(string)),
+            inputs
+        );
+    }
+}

CliFx.SourceGeneration/SemanticModel/KnownSymbolNames.cs

@@ -0,0 +1,10 @@
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal static class KnownSymbolNames
+{
+    public const string CliFxCommandInterface = "CliFx.ICommand";
+    public const string CliFxCommandAttribute = "CliFx.Attributes.CommandAttribute";
+    public const string CliFxCommandParameterAttribute =
+        "CliFx.Attributes.CommandParameterAttribute";
+    public const string CliFxCommandOptionAttribute = "CliFx.Attributes.CommandOptionAttribute";
+}

CliFx.SourceGeneration/SemanticModel/PropertyDescriptor.cs

@@ -0,0 +1,44 @@
+using System;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal partial class PropertyDescriptor(TypeDescriptor type, string name)
+{
+    public TypeDescriptor Type { get; } = type;
+
+    public string Name { get; } = name;
+}
+
+internal partial class PropertyDescriptor : IEquatable<PropertyDescriptor>
+{
+    public bool Equals(PropertyDescriptor? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return Type.Equals(other.Type) && Name == other.Name;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((PropertyDescriptor)obj);
+    }
+
+    public override int GetHashCode() => HashCode.Combine(Type, Name);
+}
+
+internal partial class PropertyDescriptor
+{
+    public static PropertyDescriptor FromSymbol(IPropertySymbol symbol) =>
+        new(TypeDescriptor.FromSymbol(symbol.Type), symbol.Name);
+}

CliFx.SourceGeneration/SemanticModel/TypeDescriptor.cs

@@ -0,0 +1,47 @@
+using System;
+using CliFx.SourceGeneration.Utils.Extensions;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.SemanticModel;
+
+internal partial class TypeDescriptor(string fullyQualifiedName)
+{
+    public string FullyQualifiedName { get; } = fullyQualifiedName;
+
+    public string Namespace { get; } = fullyQualifiedName.SubstringUntilLast(".");
+
+    public string Name { get; } = fullyQualifiedName.SubstringAfterLast(".");
+}
+
+internal partial class TypeDescriptor : IEquatable<TypeDescriptor>
+{
+    public bool Equals(TypeDescriptor? other)
+    {
+        if (ReferenceEquals(null, other))
+            return false;
+        if (ReferenceEquals(this, other))
+            return true;
+
+        return FullyQualifiedName == other.FullyQualifiedName;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (ReferenceEquals(null, obj))
+            return false;
+        if (ReferenceEquals(this, obj))
+            return true;
+        if (obj.GetType() != GetType())
+            return false;
+
+        return Equals((TypeDescriptor)obj);
+    }
+
+    public override int GetHashCode() => FullyQualifiedName.GetHashCode();
+}
+
+internal partial class TypeDescriptor
+{
+    public static TypeDescriptor FromSymbol(ITypeSymbol symbol) =>
+        new(symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+}

CliFx.SourceGeneration/Utils/Extensions/CollectionExtensions.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace CliFx.SourceGeneration.Utils.Extensions;
+
+internal static class CollectionExtensions
+{
+    public static IEnumerable<T> WhereNotNull<T>(this IEnumerable<T?> source)
+        where T : class
+    {
+        foreach (var i in source)
+        {
+            if (i is not null)
+                yield return i;
+        }
+    }
+}

CliFx.SourceGeneration/Utils/Extensions/GenericExtensions.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace CliFx.SourceGeneration.Utils.Extensions;
+
+internal static class GenericExtensions
+{
+    public static TOut Pipe<TIn, TOut>(this TIn input, Func<TIn, TOut> transform) =>
+        transform(input);
+}

CliFx.SourceGeneration/Utils/Extensions/RoslynExtensions.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+
+namespace CliFx.SourceGeneration.Utils.Extensions;
+
+internal static class RoslynExtensions
+{
+    public static bool DisplayNameMatches(this ISymbol symbol, string name) =>
+        string.Equals(
+            // Fully qualified name, without `global::`
+            symbol.ToDisplayString(SymbolDisplayFormat.CSharpErrorMessageFormat),
+            name,
+            StringComparison.Ordinal
+        );
+
+    public static T GetNamedArgumentValue<T>(
+        this AttributeData attribute,
+        string name,
+        T defaultValue = default
+    ) =>
+        attribute.NamedArguments.FirstOrDefault(i => i.Key == name).Value.Value is T valueAsT
+            ? valueAsT
+            : defaultValue;
+
+    public static IReadOnlyList<T> GetNamedArgumentValues<T>(
+        this AttributeData attribute,
+        string name
+    )
+        where T : class =>
+        attribute.NamedArguments.FirstOrDefault(i => i.Key == name).Value.Values.CastArray<T>();
+
+    public static IncrementalValuesProvider<T> WhereNotNull<T>(
+        this IncrementalValuesProvider<T?> values
+    )
+        where T : class => values.Where(i => i is not null);
+}

CliFx.SourceGeneration/Utils/Extensions/StringExtensions.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace CliFx.SourceGeneration.Utils.Extensions;
+
+internal static class StringExtensions
+{
+    public static string SubstringUntilLast(
+        this string str,
+        string sub,
+        StringComparison comparison = StringComparison.Ordinal
+    )
+    {
+        var index = str.LastIndexOf(sub, comparison);
+        return index < 0 ? str : str[..index];
+    }
+
+    public static string SubstringAfterLast(
+        this string str,
+        string sub,
+        StringComparison comparison = StringComparison.Ordinal
+    )
+    {
+        var index = str.LastIndexOf(sub, comparison);
+        return index >= 0 ? str.Substring(index + sub.Length, str.Length - index - sub.Length) : "";
+    }
+
+    public static string JoinToString<T>(this IEnumerable<T> source, string separator) =>
+        string.Join(separator, source);
+}

CliFx.Tests.Dummy/CliFx.Tests.Dummy.csproj

@@ -2,12 +2,17 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
+    <ApplicationIcon>../favicon.ico</ApplicationIcon>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="CSharpier.MsBuild" Version="0.30.6" PrivateAssets="all" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\CliFx\CliFx.csproj" />
-    <ProjectReference Include="..\CliFx.Analyzers\CliFx.Analyzers.csproj" ReferenceOutputAssembly="false" OutputItemType="analyzer" />
+    <ProjectReference Include="..\CliFx.SourceGeneration\CliFx.SourceGeneration.csproj" ReferenceOutputAssembly="false" OutputItemType="analyzer" />
   </ItemGroup>
 
 </Project>

CliFx.Tests.Dummy/Commands/CancellationTestCommand.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Threading.Tasks;
+using CliFx.Attributes;
+using CliFx.Infrastructure;
+
+namespace CliFx.Tests.Dummy.Commands;
+
+[Command("cancel-test")]
+public class CancellationTestCommand : ICommand
+{
+    public async ValueTask ExecuteAsync(IConsole console)
+    {
+        try
+        {
+            console.WriteLine("Started.");
+
+            await Task.Delay(TimeSpan.FromSeconds(3), console.RegisterCancellationHandler());
+
+            console.WriteLine("Completed.");
+        }
+        catch (OperationCanceledException)
+        {
+            console.WriteLine("Cancelled.");
+            throw;
+        }
+    }
+}

CliFx.Tests.Dummy/Commands/EnvironmentTestCommand.cs

@@ -8,12 +8,11 @@ namespace CliFx.Tests.Dummy.Commands;
 public class EnvironmentTestCommand : ICommand
 {
     [CommandOption("target", EnvironmentVariable = "ENV_TARGET")]
-    public string GreetingTarget { get; set; } = "World";
+    public string GreetingTarget { get; init; } = "World";
 
     public ValueTask ExecuteAsync(IConsole console)
     {
-        console.Output.WriteLine($"Hello {GreetingTarget}!");
-
+        console.WriteLine($"Hello {GreetingTarget}!");
         return default;
     }
 }

CliFx.Tests.Dummy/Program.cs

@@ -1,21 +1,20 @@
 using System;
+using System.IO;
 using System.Reflection;
 using System.Threading.Tasks;
 
 namespace CliFx.Tests.Dummy;
 
-// This dummy application is used in tests for scenarios
-// that require an external process to properly verify.
-
-public static partial class Program
+// This dummy application is used in tests for scenarios that require an external process to properly verify
+public static class Program
 {
-    public static Assembly Assembly { get; } = Assembly.GetExecutingAssembly();
+    // Path to the apphost
+    public static string FilePath { get; } =
+        Path.ChangeExtension(
+            Assembly.GetExecutingAssembly().Location,
+            OperatingSystem.IsWindows() ? "exe" : null
+        );
 
-    public static string Location { get; } = Assembly.Location;
-}
-
-public static partial class Program
-{
     public static async Task Main()
     {
         // Make sure color codes are not produced because we rely on the output in tests
@@ -24,9 +23,6 @@ public static partial class Program
             "false"
         );
 
-        await new CliApplicationBuilder()
-            .AddCommandsFromThisAssembly()
-            .Build()
-            .RunAsync();
+        await new CliApplicationBuilder().AddCommandsFromThisAssembly().Build().RunAsync();
     }
 }

CliFx.Tests/ApplicationSpecs.cs

@@ -8,15 +8,10 @@ using Xunit.Abstractions;
 
 namespace CliFx.Tests;
 
-public class ApplicationSpecs : SpecsBase
+public class ApplicationSpecs(ITestOutputHelper testOutput) : SpecsBase(testOutput)
 {
-    public ApplicationSpecs(ITestOutputHelper testOutput)
-        : base(testOutput)
-    {
-    }
-
     [Fact]
-    public async Task Application_can_be_created_with_minimal_configuration()
+    public async Task I_can_create_an_application_with_the_default_configuration()
     {
         // Act
         var app = new CliApplicationBuilder()
@@ -24,24 +19,21 @@ public class ApplicationSpecs : SpecsBase
             .UseConsole(FakeConsole)
             .Build();
 
-        var exitCode = await app.RunAsync(
-            Array.Empty<string>(),
-            new Dictionary<string, string>()
-        );
+        var exitCode = await app.RunAsync([], new Dictionary<string, string>());
 
         // Assert
         exitCode.Should().Be(0);
     }
 
     [Fact]
-    public async Task Application_can_be_created_with_a_fully_customized_configuration()
+    public async Task I_can_create_an_application_with_a_custom_configuration()
     {
         // Act
         var app = new CliApplicationBuilder()
             .AddCommand<NoOpCommand>()
             .AddCommandsFrom(typeof(NoOpCommand).Assembly)
-            .AddCommands(new[] {typeof(NoOpCommand)})
-            .AddCommandsFrom(new[] {typeof(NoOpCommand).Assembly})
+            .AddCommands([typeof(NoOpCommand)])
+            .AddCommandsFrom([typeof(NoOpCommand).Assembly])
             .AddCommandsFromThisAssembly()
             .AllowDebugMode()
             .AllowPreviewMode()
@@ -53,17 +45,14 @@ public class ApplicationSpecs : SpecsBase
             .UseTypeActivator(Activator.CreateInstance!)
             .Build();
 
-        var exitCode = await app.RunAsync(
-            Array.Empty<string>(),
-            new Dictionary<string, string>()
-        );
+        var exitCode = await app.RunAsync([], new Dictionary<string, string>());
 
         // Assert
         exitCode.Should().Be(0);
     }
 
     [Fact]
-    public async Task Application_configuration_fails_if_an_invalid_command_is_registered()
+    public async Task I_can_try_to_create_an_application_and_get_an_error_if_it_has_invalid_commands()
     {
         // Act
         var app = new CliApplicationBuilder()
@@ -71,15 +60,12 @@ public class ApplicationSpecs : SpecsBase
             .UseConsole(FakeConsole)
             .Build();
 
-        var exitCode = await app.RunAsync(
-            Array.Empty<string>(),
-            new Dictionary<string, string>()
-        );
-
-        var stdErr = FakeConsole.ReadErrorString();
+        var exitCode = await app.RunAsync([], new Dictionary<string, string>());
 
         // Assert
         exitCode.Should().NotBe(0);
+
+        var stdErr = FakeConsole.ReadErrorString();
         stdErr.Should().Contain("not a valid command");
     }
 }

CliFx.Tests/CancellationSpecs.cs

@@ -1,26 +1,63 @@
 using System;
 using System.Collections.Generic;
+using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using CliFx.Tests.Utils;
+using CliFx.Tests.Utils.Extensions;
+using CliWrap;
 using FluentAssertions;
 using Xunit;
 using Xunit.Abstractions;
 
 namespace CliFx.Tests;
 
-public class CancellationSpecs : SpecsBase
+public class CancellationSpecs(ITestOutputHelper testOutput) : SpecsBase(testOutput)
 {
-    public CancellationSpecs(ITestOutputHelper testOutput)
-        : base(testOutput)
+    [Fact(Timeout = 15000)]
+    public async Task I_can_configure_the_command_to_listen_to_the_interrupt_signal()
     {
+        // Arrange
+        using var cts = new CancellationTokenSource();
+
+        // We need to send the cancellation request right after the process has registered
+        // a handler for the interrupt signal, otherwise the default handler will trigger
+        // and just kill the process.
+        void HandleStdOut(string line)
+        {
+            if (string.Equals(line, "Started.", StringComparison.OrdinalIgnoreCase))
+                cts.CancelAfter(TimeSpan.FromSeconds(0.2));
+        }
+
+        var stdOutBuffer = new StringBuilder();
+
+        var pipeTarget = PipeTarget.Merge(
+            PipeTarget.ToDelegate(HandleStdOut),
+            PipeTarget.ToStringBuilder(stdOutBuffer)
+        );
+
+        var command = Cli.Wrap(Dummy.Program.FilePath).WithArguments("cancel-test") | pipeTarget;
+
+        // Act & assert
+        await Assert.ThrowsAnyAsync<OperationCanceledException>(
+            async () =>
+                await command.ExecuteAsync(
+                    // Forceful cancellation (not required because we have a timeout)
+                    CancellationToken.None,
+                    // Graceful cancellation
+                    cts.Token
+                )
+        );
+
+        stdOutBuffer.ToString().Trim().Should().ConsistOfLines("Started.", "Cancelled.");
     }
 
     [Fact]
-    public async Task Command_can_receive_a_cancellation_signal_from_the_console()
+    public async Task I_can_configure_the_command_to_listen_to_the_interrupt_signal_when_running_in_isolation()
     {
         // Arrange
         var commandType = DynamicCommandBuilder.Compile(
-            // language=cs
+            // lang=csharp
             """
             [Command]
             public class Command : ICommand
@@ -29,16 +66,18 @@ public class CancellationSpecs : SpecsBase
                 {
                     try
                     {
+                        console.WriteLine("Started.");
+
                         await Task.Delay(
                             TimeSpan.FromSeconds(3),
                             console.RegisterCancellationHandler()
                         );
 
-                        console.Output.WriteLine("Completed successfully");
+                        console.WriteLine("Completed.");
                     }
                     catch (OperationCanceledException)
                     {
-                        console.Output.WriteLine("Cancelled");
+                        console.WriteLine("Cancelled.");
                         throw;
                     }
                 }
@@ -51,18 +90,18 @@ public class CancellationSpecs : SpecsBase
             .UseConsole(FakeConsole)
             .Build();
 
-        // Act
         FakeConsole.RequestCancellation(TimeSpan.FromSeconds(0.2));
 
+        // Act
         var exitCode = await application.RunAsync(
-            Array.Empty<string>(),
+            [],
             new Dictionary<string, string>()
         );
 
-        var stdOut = FakeConsole.ReadOutputString();
-
         // Assert
         exitCode.Should().NotBe(0);
-        stdOut.Trim().Should().Be("Cancelled");
+
+        var stdOut = FakeConsole.ReadOutputString();
+        stdOut.Trim().Should().ConsistOfLines("Started.", "Cancelled.");
     }
 }

CliFx.Tests/CliFx.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net9.0</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
@@ -9,16 +9,18 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Basic.Reference.Assemblies.Net70" Version="1.4.1" />
-    <PackageReference Include="CliWrap" Version="3.6.0" />
-    <PackageReference Include="FluentAssertions" Version="6.10.0" />
-    <PackageReference Include="GitHubActionsTestLogger" Version="2.0.1" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" />
-    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" PrivateAssets="all" />
-    <PackageReference Include="coverlet.collector" Version="3.2.0" PrivateAssets="all" />
+    <PackageReference Include="Basic.Reference.Assemblies.Net80" Version="1.8.0" />
+    <PackageReference Include="CliWrap" Version="3.7.1" />
+    <PackageReference Include="coverlet.collector" Version="6.0.4" PrivateAssets="all" />
+    <PackageReference Include="CSharpier.MsBuild" Version="0.30.6" PrivateAssets="all" />
+    <PackageReference Include="FluentAssertions" Version="8.0.1" />
+    <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.11.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="PolyShim" Version="1.14.0" PrivateAssets="all" />
+    <PackageReference Include="xunit" Version="2.9.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1" PrivateAssets="all" />
   </ItemGroup>
 
   <ItemGroup>