Preserve line breaks

Closes #32

src/Spectre.Console.Tests/Fixtures/PlainConsole.cs

@@ -18,6 +18,7 @@ namespace Spectre.Console.Tests
         public Color Background { get; set; }
 
         public StringWriter Writer { get; }
+        public string RawOutput => Writer.ToString();
         public string Output => Writer.ToString().TrimEnd('\n');
         public IReadOnlyList<string> Lines => Output.Split(new char[] { '\n' });
 

src/Spectre.Console.Tests/Unit/Composition/TableTests.cs

@@ -307,5 +307,24 @@ namespace Spectre.Console.Tests.Unit.Composition
             console.Lines[5].ShouldBe("│ Grault │ Garply │   Fred   │");
             console.Lines[6].ShouldBe("└────────┴────────┴──────────┘");
         }
+
+        [Fact]
+        public void Should_Render_Table_Without_Footer_If_No_Rows_Are_Added()
+        {
+            // Given
+            var console = new PlainConsole(width: 80);
+            var table = new Table();
+            table.AddColumns("Foo", "Bar");
+            table.AddColumn(new TableColumn("Baz") { Padding = new Padding(3, 2) });
+
+            // When
+            console.Render(table);
+
+            // Then
+            console.Lines.Count.ShouldBe(3);
+            console.Lines[0].ShouldBe("┌─────┬─────┬────────┐");
+            console.Lines[1].ShouldBe("│ Foo │ Bar │   Baz  │");
+            console.Lines[2].ShouldBe("└─────┴─────┴────────┘");
+        }
     }
 }

src/Spectre.Console.Tests/Unit/Composition/TextTests.cs

@@ -21,6 +21,20 @@ namespace Spectre.Console.Tests.Unit
                 .ShouldBe("Hello World");
         }
 
+        [Fact]
+        public void Should_Write_Line_Breaks()
+        {
+            // Given
+            var fixture = new PlainConsole(width: 5);
+            var text = Text.New("\n\n");
+
+            // When
+            fixture.Render(text);
+
+            // Then
+            fixture.RawOutput.ShouldBe("\n\n");
+        }
+
         [Fact]
         public void Should_Split_Unstyled_Text_To_New_Lines_If_Width_Exceeds_Console_Width()
         {

src/Spectre.Console/Composition/Table.Calculations.cs

@@ -61,7 +61,7 @@ namespace Spectre.Console
                         .Where(x => x.allowWrap)
                         .Max(x => x.width);
 
-                    var secondMaxColumn = widths.Zip(wrappable, (width, allowWrap) => allowWrap && width != maxColumn ? width : 0).Max();
+                    var secondMaxColumn = widths.Zip(wrappable, (width, allowWrap) => allowWrap && width != maxColumn ? width : 1).Max();
                     var columnDifference = maxColumn - secondMaxColumn;
 
                     var ratios = widths.Zip(wrappable, (width, allowWrap) => width == maxColumn && allowWrap ? 1 : 0).ToList();
@@ -96,9 +96,15 @@ namespace Spectre.Console
 
             var minWidths = new List<int>();
             var maxWidths = new List<int>();
+
+            // Include columns in measurement
+            var measure = ((IRenderable)column.Text).Measure(options, maxWidth);
+            minWidths.Add(measure.Min);
+            maxWidths.Add(measure.Max);
+
             foreach (var row in rows)
             {
-                var measure = ((IRenderable)row).Measure(options, maxWidth);
+                measure = ((IRenderable)row).Measure(options, maxWidth);
                 minWidths.Add(measure.Min);
                 maxWidths.Add(measure.Max);
             }

src/Spectre.Console/Composition/Table.cs

@@ -178,6 +178,7 @@ namespace Spectre.Console
 
             var showBorder = Border != BorderKind.None;
             var hideBorder = Border == BorderKind.None;
+            var hasRows = _rows.Count > 0;
 
             var maxWidth = width;
             if (Width != null)
@@ -303,7 +304,7 @@ namespace Spectre.Console
                 }
 
                 // Show header separator?
-                if (firstRow && showBorder && ShowHeaders)
+                if (firstRow && showBorder && ShowHeaders && hasRows)
                 {
                     result.Add(new Segment(border.GetPart(BorderPart.HeaderBottomLeft)));
                     foreach (var (columnIndex, first, lastColumn, columnWidth) in columnWidths.Enumerate())

src/Spectre.Console/Composition/Text.cs

@@ -136,7 +136,12 @@ namespace Spectre.Console
         /// <inheritdoc/>
         IEnumerable<Segment> IRenderable.Render(RenderContext context, int width)
         {
-            if (string.IsNullOrWhiteSpace(_text))
+            if (string.IsNullOrEmpty(_text))
+            {
+                return Array.Empty<Segment>();
+            }
+
+            if (width == 0)
             {
                 return Array.Empty<Segment>();
             }
@@ -187,7 +192,7 @@ namespace Spectre.Console
                     }
                 }
 
-                if (!last)
+                if (!last || line.Count == 0)
                 {
                     result.Add(Segment.LineBreak());
                 }
@@ -209,7 +214,10 @@ namespace Spectre.Console
                 var index = segment.Text.IndexOf("\n", StringComparison.OrdinalIgnoreCase);
                 if (index == -1)
                 {
-                    result.Add(segment);
+                    if (!string.IsNullOrEmpty(segment.Text))
+                    {
+                        result.Add(segment);
+                    }
                 }
                 else
                 {