asd

CliFx/Attributes/CommandAttribute.cs

@@ -6,7 +6,7 @@ namespace CliFx.Attributes;
 /// Annotates a type that defines a command.
 /// </summary>
 [AttributeUsage(AttributeTargets.Class, Inherited = false)]
-public sealed class CommandAttribute : Attribute
+public class CommandAttribute : Attribute
 {
     /// <summary>
     /// Initializes an instance of <see cref="CommandAttribute" />.

CliFx/Attributes/CommandHelpOptionAttribute.cs

@@ -0,0 +1,16 @@
+namespace CliFx.Attributes;
+
+/// <summary>
+/// Annotates a property that defines the help option for a command.
+/// </summary>
+public class CommandHelpOptionAttribute : CommandOptionAttribute
+{
+    /// <summary>
+    /// Initializes an instance of <see cref="CommandHelpOptionAttribute" />.
+    /// </summary>
+    public CommandHelpOptionAttribute()
+        : base("help", 'h')
+    {
+        Description = "Show help for this command.";
+    }
+}

CliFx/Attributes/CommandOptionAttribute.cs

@@ -7,7 +7,7 @@ namespace CliFx.Attributes;
 /// Annotates a property that defines a command option.
 /// </summary>
 [AttributeUsage(AttributeTargets.Property)]
-public sealed class CommandOptionAttribute : Attribute
+public class CommandOptionAttribute : Attribute
 {
     /// <summary>
     /// Initializes an instance of <see cref="CommandOptionAttribute" />.

CliFx/Attributes/CommandParameterAttribute.cs

@@ -7,7 +7,7 @@ namespace CliFx.Attributes;
 /// Annotates a property that defines a command parameter.
 /// </summary>
 [AttributeUsage(AttributeTargets.Property)]
-public sealed class CommandParameterAttribute(int order) : Attribute
+public class CommandParameterAttribute(int order) : Attribute
 {
     /// <summary>
     /// Parameter order.

CliFx/Attributes/CommandVersionOptionAttribute.cs

@@ -0,0 +1,16 @@
+namespace CliFx.Attributes;
+
+/// <summary>
+/// Annotates a property that defines the version option for a command.
+/// </summary>
+public class CommandVersionOptionAttribute : CommandOptionAttribute
+{
+    /// <summary>
+    /// Initializes an instance of <see cref="CommandVersionOptionAttribute" />.
+    /// </summary>
+    public CommandVersionOptionAttribute()
+        : base("version")
+    {
+        Description = "Show application version.";
+    }
+}

CliFx/CliApplication.cs

@@ -41,16 +41,6 @@ public class CliApplication(
     private bool IsPreviewModeEnabled(CommandInput commandInput) =>
         Configuration.IsPreviewModeAllowed && commandInput.IsPreviewDirectiveSpecified;
 
-    private bool ShouldShowHelpText(CommandSchema commandSchema, CommandInput commandInput) =>
-        commandSchema.IsHelpOptionAvailable && commandInput.IsHelpOptionSpecified
-        ||
-        // Show help text also if the fallback default command is executed without any arguments
-        commandSchema == FallbackDefaultCommand.Schema
-            && !commandInput.HasArguments;
-
-    private bool ShouldShowVersionText(CommandSchema commandSchema, CommandInput commandInput) =>
-        commandSchema.IsVersionOptionAvailable && commandInput.IsVersionOptionSpecified;
-
     private async ValueTask PromptDebuggerAsync()
     {
         using (console.WithForegroundColor(ConsoleColor.Green))
@@ -119,30 +109,36 @@ public class CliApplication(
             commandSchema.GetValues(commandInstance)
         );
 
-        // Handle the help option
-        if (ShouldShowHelpText(commandSchema, commandInput))
-        {
-            console.WriteHelpText(helpContext);
-            return 0;
-        }
-
-        // Handle the version option
-        if (ShouldShowVersionText(commandSchema, commandInput))
-        {
-            console.WriteLine(Metadata.Version);
-            return 0;
-        }
-
         // Starting from this point, we may produce exceptions that are meant for the
         // end-user of the application (i.e. invalid input, command exception, etc).
         // Catch these exceptions here, print them to the console, and don't let them
         // propagate further.
         try
         {
-            // Bind and execute the command
+            // Bind the command input to the command instance
             _commandBinder.Bind(commandInput, commandSchema, commandInstance);
-            await commandInstance.ExecuteAsync(console);
 
+            // Handle the version option
+            if (commandInstance is ICommandWithVersionOption { IsVersionRequested: true })
+            {
+                console.WriteLine(Metadata.Version);
+                return 0;
+            }
+
+            // Handle the help option
+            if (
+                commandInstance
+                is ICommandWithHelpOption { IsHelpRequested: true }
+                    // Fallback default command always shows help, even if the option is not specified
+                    or FallbackDefaultCommand
+            )
+            {
+                console.WriteHelpText(helpContext);
+                return 0;
+            }
+
+            // Execute the command
+            await commandInstance.ExecuteAsync(console);
             return 0;
         }
         catch (CliFxException ex)

CliFx/CliApplicationBuilder.cs

@@ -175,7 +175,7 @@ public partial class CliApplicationBuilder
     [UnconditionalSuppressMessage(
         "SingleFile",
         "IL3000:Avoid accessing Assembly file path when publishing as a single file",
-        Justification = "The return value of the method is checked to ensure the assembly location is available."
+        Justification = "The file path is checked to ensure the assembly location is available."
     )]
     private static string GetDefaultExecutableName()
     {

CliFx/CliFx.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net8.0</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0;net8.0</TargetFrameworks>
     <IsPackable>true</IsPackable>
     <IsTrimmable Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">true</IsTrimmable>
     <IsAotCompatible Condition="$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net7.0'))">true</IsAotCompatible>

CliFx/CommandBinder.cs

@@ -16,7 +16,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
 {
     private readonly IFormatProvider _formatProvider = CultureInfo.InvariantCulture;
 
-    private object? ConvertSingle(IInputSchema inputSchema, string? rawValue, Type targetType)
+    private object? ConvertSingle(InputSchema inputSchema, string? rawValue, Type targetType)
     {
         // Custom converter
         if (inputSchema.Converter is not null)
@@ -103,7 +103,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
     }
 
     private object? ConvertMultiple(
-        IInputSchema inputSchema,
+        InputSchema inputSchema,
         IReadOnlyList<string> rawValues,
         Type targetEnumerableType,
         Type targetElementType
@@ -137,7 +137,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
         );
     }
 
-    private object? ConvertMember(IInputSchema inputSchema, IReadOnlyList<string> rawValues)
+    private object? ConvertMember(InputSchema inputSchema, IReadOnlyList<string> rawValues)
     {
         try
         {
@@ -192,7 +192,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
         );
     }
 
-    private void ValidateMember(IInputSchema inputSchema, object? convertedValue)
+    private void ValidateMember(InputSchema inputSchema, object? convertedValue)
     {
         var errors = new List<BindingValidationError>();
 
@@ -218,7 +218,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
     }
 
     private void BindMember(
-        IInputSchema inputSchema,
+        InputSchema inputSchema,
         ICommand commandInstance,
         IReadOnlyList<string> rawValues
     )
@@ -335,7 +335,7 @@ internal class CommandBinder(ITypeActivator typeActivator)
             // Environment variable
             else if (environmentVariableInput is not null)
             {
-                var rawValues = optionSchema.IsScalar
+                var rawValues = optionSchema.IsSequence
                     ? [environmentVariableInput.Value]
                     : environmentVariableInput.SplitValues();
 

CliFx/FallbackDefaultCommand.cs

@@ -9,8 +9,14 @@ namespace CliFx;
 // Fallback command used when the application doesn't have one configured.
 // This command is only used as a stub for help text.
 [Command]
-internal partial class FallbackDefaultCommand : ICommand
+internal partial class FallbackDefaultCommand : ICommandWithHelpOption, ICommandWithVersionOption
 {
+    [CommandHelpOption]
+    public bool IsHelpRequested { get; init; }
+
+    [CommandVersionOption]
+    public bool IsVersionRequested { get; init; }
+
     // Never actually executed
     [ExcludeFromCodeCoverage]
     public ValueTask ExecuteAsync(IConsole console) => default;

CliFx/Formatting/HelpConsoleFormatter.cs

@@ -69,7 +69,7 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
             {
                 Write(
                     ConsoleColor.DarkCyan,
-                    parameter.Property.IsScalar() ? $"<{parameter.Name}>" : $"<{parameter.Name}...>"
+                    parameter.IsSequence ? $"<{parameter.Name}...>" : $"<{parameter.Name}>"
                 );
                 Write(' ');
             }
@@ -85,7 +85,7 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
                 );
                 Write(' ');
 
-                Write(ConsoleColor.White, option.Property.IsScalar() ? "<value>" : "<values...>");
+                Write(ConsoleColor.White, option.IsSequence ? "<values...>" : "<value>");
                 Write(' ');
             }
 
@@ -170,8 +170,8 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
             }
 
             // Valid values
-            var validValues = parameterSchema.Property.GetValidValues();
+            var validValues = parameterSchema.Property.TryGetValidValues();
-            if (validValues.Any())
+            if (validValues?.Any() == true)
             {
                 Write(ConsoleColor.White, "Choices: ");
 
@@ -257,8 +257,8 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
             }
 
             // Valid values
-            var validValues = optionSchema.Property.GetValidValues();
+            var validValues = optionSchema.Property.TryGetValidValues();
-            if (validValues.Any())
+            if (validValues?.Any() == true)
             {
                 Write(ConsoleColor.White, "Choices: ");
 
@@ -305,7 +305,7 @@ internal class HelpConsoleFormatter(ConsoleWriter consoleWriter, HelpContext con
         }
     }
 
-    private void WriteDefaultValue(IMemberSchema schema)
+    private void WriteDefaultValue(InputSchema schema)
     {
         var defaultValue = context.CommandDefaultValues.GetValueOrDefault(schema);
         if (defaultValue is not null)

CliFx/Formatting/HelpContext.cs

@@ -7,7 +7,7 @@ internal class HelpContext(
     ApplicationMetadata applicationMetadata,
     ApplicationSchema applicationSchema,
     CommandSchema commandSchema,
-    IReadOnlyDictionary<IInputSchema, object?> commandDefaultValues
+    IReadOnlyDictionary<InputSchema, object?> commandDefaultValues
 )
 {
     public ApplicationMetadata ApplicationMetadata { get; } = applicationMetadata;
@@ -16,6 +16,6 @@ internal class HelpContext(
 
     public CommandSchema CommandSchema { get; } = commandSchema;
 
-    public IReadOnlyDictionary<IInputSchema, object?> CommandDefaultValues { get; } =
+    public IReadOnlyDictionary<InputSchema, object?> CommandDefaultValues { get; } =
         commandDefaultValues;
 }

CliFx/ICommandWithHelpOption.cs

@@ -0,0 +1,12 @@
+namespace CliFx;
+
+/// <summary>
+/// Command definition that includes the help option.
+/// </summary>
+public interface ICommandWithHelpOption : ICommand
+{
+    /// <summary>
+    /// Whether the user requested help for this command (via the `-h|--help` option).
+    /// </summary>
+    bool IsHelpRequested { get; }
+}

CliFx/ICommandWithVersionOption.cs

@@ -0,0 +1,12 @@
+namespace CliFx;
+
+/// <summary>
+/// Command definition that includes the version option.
+/// </summary>
+public interface ICommandWithVersionOption : ICommand
+{
+    /// <summary>
+    /// Whether the user requested the version information (via the `--version` option).
+    /// </summary>
+    bool IsVersionRequested { get; }
+}

CliFx/Schema/CommandSchema.cs

@@ -16,7 +16,7 @@ public class CommandSchema(
 )
 {
     /// <summary>
-    /// Command's CLR type.
+    /// Underlying CLR type of the command.
     /// </summary>
     [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
     public Type Type { get; } = type;
@@ -26,6 +26,11 @@ public class CommandSchema(
     /// </summary>
     public string? Name { get; } = name;
 
+    /// <summary>
+    /// Whether this command is the application's default command.
+    /// </summary>
+    public bool IsDefault { get; } = string.IsNullOrWhiteSpace(name);
+
     /// <summary>
     /// Command description.
     /// </summary>
@@ -41,19 +46,14 @@ public class CommandSchema(
     /// </summary>
     public IReadOnlyList<OptionSchema> Options { get; } = options;
 
-    /// <summary>
-    /// Whether this command is the application's default command.
-    /// </summary>
-    public bool IsDefault { get; } = string.IsNullOrWhiteSpace(name);
-
     internal bool MatchesName(string? name) =>
         !string.IsNullOrWhiteSpace(Name)
             ? string.Equals(name, Name, StringComparison.OrdinalIgnoreCase)
             : string.IsNullOrWhiteSpace(name);
 
-    internal IReadOnlyDictionary<IInputSchema, object?> GetValues(ICommand instance)
+    internal IReadOnlyDictionary<InputSchema, object?> GetValues(ICommand instance)
     {
-        var result = new Dictionary<IInputSchema, object?>();
+        var result = new Dictionary<InputSchema, object?>();
 
         foreach (var parameterSchema in Parameters)
         {

CliFx/Schema/IInputSchema.cs

@@ -1,25 +0,0 @@
-using System.Collections.Generic;
-using CliFx.Extensibility;
-
-namespace CliFx.Schema;
-
-/// <summary>
-/// Describes an input of a command, which can be either a parameter or an option.
-/// </summary>
-public interface IInputSchema
-{
-    /// <summary>
-    /// Describes the binding of this input to a CLR property.
-    /// </summary>
-    PropertyBinding Property { get; }
-
-    /// <summary>
-    /// Optional binding converter for this input.
-    /// </summary>
-    IBindingConverter? Converter { get; }
-
-    /// <summary>
-    /// Optional binding validator(s) for this input.
-    /// </summary>
-    IReadOnlyList<IBindingValidator> Validators { get; }
-}

CliFx/Schema/InputSchema.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using CliFx.Extensibility;
+
+namespace CliFx.Schema;
+
+/// <summary>
+/// Describes an input of a command, which can be either a parameter or an option.
+/// </summary>
+public abstract class InputSchema(
+    PropertyBinding property,
+    bool isSequence,
+    IBindingConverter? converter,
+    IReadOnlyList<IBindingValidator> validators
+)
+{
+    /// <summary>
+    /// CLR property to which this input is bound.
+    /// </summary>
+    public PropertyBinding Property { get; } = property;
+
+    /// <summary>
+    /// Whether this input can accept more than one value.
+    /// </summary>
+    public bool IsSequence { get; } = isSequence;
+
+    /// <summary>
+    /// Optional binding converter for this input.
+    /// </summary>
+    public IBindingConverter? Converter { get; } = converter;
+
+    /// <summary>
+    /// Optional binding validator(s) for this input.
+    /// </summary>
+    public IReadOnlyList<IBindingValidator> Validators { get; } = validators;
+}

CliFx/Schema/OptionSchema.cs

@@ -6,12 +6,11 @@ using CliFx.Extensibility;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes a command's option.
+/// Describes an option input of a command.
 /// </summary>
 public class OptionSchema(
     PropertyBinding property,
-    bool isScalar,
+    bool isSequence,
-    IReadOnlyList<object?>? validValues,
     string? name,
     char? shortName,
     string? environmentVariable,
@@ -19,17 +18,8 @@ public class OptionSchema(
     string? description,
     IBindingConverter? converter,
     IReadOnlyList<IBindingValidator> validators
-) : IInputSchema
+) : InputSchema(property, isSequence, converter, validators)
 {
-    /// <inheritdoc />
-    public PropertyBinding Property { get; } = property;
-
-    /// <inheritdoc />
-    public bool IsScalar { get; } = isScalar;
-
-    /// <inheritdoc />
-    public IReadOnlyList<object?>? ValidValues { get; } = validValues;
-
     /// <summary>
     /// Option name.
     /// </summary>
@@ -55,12 +45,6 @@ public class OptionSchema(
     /// </summary>
     public string? Description { get; } = description;
 
-    /// <inheritdoc />
-    public IBindingConverter? Converter { get; } = converter;
-
-    /// <inheritdoc />
-    public IReadOnlyList<IBindingValidator> Validators { get; } = validators;
-
     internal bool MatchesName(string? name) =>
         !string.IsNullOrWhiteSpace(Name)
         && string.Equals(Name, name, StringComparison.OrdinalIgnoreCase);

CliFx/Schema/ParameterSchema.cs

@@ -4,29 +4,19 @@ using CliFx.Extensibility;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes a command's parameter.
+/// Describes a parameter input of a command.
 /// </summary>
 public class ParameterSchema(
     PropertyBinding property,
-    bool isScalar,
+    bool isSequence,
-    IReadOnlyList<object?>? validValues,
     int order,
     string name,
     bool isRequired,
     string? description,
     IBindingConverter? converter,
     IReadOnlyList<IBindingValidator> validators
-) : IInputSchema
+) : InputSchema(property, isSequence, converter, validators)
 {
-    /// <inheritdoc />
-    public PropertyBinding Property { get; } = property;
-
-    /// <inheritdoc />
-    public bool IsScalar { get; } = isScalar;
-
-    /// <inheritdoc />
-    public IReadOnlyList<object?>? ValidValues { get; } = validValues;
-
     /// <summary>
     /// Order, in which the parameter is bound from the command-line arguments.
     /// </summary>
@@ -47,12 +37,5 @@ public class ParameterSchema(
     /// </summary>
     public string? Description { get; } = description;
 
-    /// <inheritdoc />
+    internal string GetFormattedIdentifier() => IsSequence ? $"<{Name}>" : $"<{Name}...>";
-    public IBindingConverter? Converter { get; } = converter;
-
-    /// <inheritdoc />
-    public IReadOnlyList<IBindingValidator> Validators { get; } = validators;
-
-    internal string GetFormattedIdentifier() =>
-        IsScalar ? $"<{Name}>" : $"<{Name}...>";
 }

CliFx/Schema/PropertyBinding.cs

@@ -5,18 +5,18 @@ using System.Linq;
 namespace CliFx.Schema;
 
 /// <summary>
-/// Describes a CLR property.
+/// Represents a binding to a CLR property.
 /// </summary>
 public class PropertyBinding(
-    Type propertyType,
+    Type type,
     Func<object, object?> getValue,
     Action<object, object?> setValue
-    )
+)
 {
     /// <summary>
-    /// Underlying property type.
+    /// Underlying CLR type of the property.
     /// </summary>
-    public Type PropertyType { get; } = propertyType;
+    public Type Type { get; } = type;
 
     /// <summary>
     /// Gets the current value of the property on the specified instance.
@@ -27,12 +27,23 @@ public class PropertyBinding(
     /// Sets the value of the property on the specified instance.
     /// </summary>
     public void SetValue(object instance, object? value) => setValue(instance, value);
-}
 
-internal static class PropertyBindingExtensions
+    internal IReadOnlyList<object?>? TryGetValidValues()
-{
+    {
-    public static IReadOnlyList<object?>? TryGetValidValues(this PropertyBinding binding) =>
+        if (Type.IsEnum)
-        binding.PropertyType.IsEnum
+        {
-            ? binding.PropertyType.GetEnumValuesAsUnderlyingType().Cast<object?>().ToArray()
+            var values =
-            : null;
+#if NET7_0_OR_GREATER
+            Type.GetEnumValuesAsUnderlyingType();
+#else
+                // AOT-compatible APIs are not available here, but it's unlikely
+                // someone will be AOT-compiling a net6.0 or older app anyway.
+                Type.GetEnumValues();
+#endif
+
+            return values.Cast<object?>().ToArray();
+        }
+
+        return null;
+    }
 }

CliFx/Utils/Extensions/TypeExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Reflection;
 
@@ -8,13 +9,17 @@ namespace CliFx.Utils.Extensions;
 
 internal static class TypeExtensions
 {
-    public static bool Implements(this Type type, Type interfaceType) =>
+    public static bool Implements(
-        type.GetInterfaces().Contains(interfaceType);
+        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces)] this Type type,
+        Type interfaceType
+    ) => type.GetInterfaces().Contains(interfaceType);
 
     public static Type? TryGetNullableUnderlyingType(this Type type) =>
         Nullable.GetUnderlyingType(type);
 
-    public static Type? TryGetEnumerableUnderlyingType(this Type type)
+    public static Type? TryGetEnumerableUnderlyingType(
+        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.Interfaces)] this Type type
+    )
     {
         if (type.IsPrimitive)
             return null;
@@ -35,24 +40,20 @@ internal static class TypeExtensions
     }
 
     public static MethodInfo? TryGetStaticParseMethod(
-        this Type type,
+        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods)] this Type type,
         bool withFormatProvider = false
-    )
+    ) =>
-    {
+        type.GetMethod(
-        var argumentTypes = withFormatProvider
-            ? new[] { typeof(string), typeof(IFormatProvider) }
-            : new[] { typeof(string) };
-
-        return type.GetMethod(
             "Parse",
             BindingFlags.Public | BindingFlags.Static,
             null,
-            argumentTypes,
+            withFormatProvider ? [typeof(string), typeof(IFormatProvider)] : [typeof(string)],
             null
         );
-    }
 
-    public static bool IsToStringOverriden(this Type type)
+    public static bool IsToStringOverriden(
+        [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods)] this Type type
+    )
     {
         var toStringMethod = type.GetMethod(nameof(ToString), Type.EmptyTypes);
         return toStringMethod?.GetBaseDefinition()?.DeclaringType != toStringMethod?.DeclaringType;