Add option to configure the style of the choices list and the default…

… value in TextPrompt (#681)

* Allow setting the style of the default value in TextPrompt

Add property "DefaultValueStyle" to TextPrompt which allows setting the style in which the default value is rendered.
When no style is set, the value is displayed as green text, keeping the existing behavior.

* Allow setting the style in which a TextPrompt's choices are displayed

Add property "ChoicesStyle" to TextPrompt which allows setting the style in the prompt's choices are rendered.
When no style is set, choices are displayed as blue text, keeping the existing behavior.

src/Spectre.Console/Prompts/TextPrompt.cs

@@ -63,6 +63,16 @@ public sealed class TextPrompt<T> : IPrompt<T>
     /// </summary>
     public Func<T, ValidationResult>? Validator { get; set; }
 
+    /// <summary>
+    /// Gets or sets the style in which the default value is displayed.
+    /// </summary>
+    public Style? DefaultValueStyle { get; set; }
+
+    /// <summary>
+    /// Gets or sets the style in which the list of choices is displayed.
+    /// </summary>
+    public Style? ChoicesStyle { get; set; }
+
     /// <summary>
     /// Gets or sets the default value.
     /// </summary>
@@ -183,16 +193,20 @@ private void WritePrompt(IAnsiConsole console)
             appendSuffix = true;
             var converter = Converter ?? TypeConverterHelper.ConvertToString;
             var choices = string.Join("/", Choices.Select(choice => converter(choice)));
-            builder.AppendFormat(CultureInfo.InvariantCulture, " [blue][[{0}]][/]", choices);
+            var choicesStyle = ChoicesStyle?.ToMarkup() ?? "blue";
+            builder.AppendFormat(CultureInfo.InvariantCulture, " [{0}][[{1}]][/]", choicesStyle, choices);
         }
 
         if (ShowDefaultValue && DefaultValue != null)
         {
             appendSuffix = true;
             var converter = Converter ?? TypeConverterHelper.ConvertToString;
+            var defaultValueStyle = DefaultValueStyle?.ToMarkup() ?? "green";
+
             builder.AppendFormat(
                 CultureInfo.InvariantCulture,
-                " [green]({0})[/]",
+                " [{0}]({1})[/]",
+                defaultValueStyle,
                 IsSecret ? "******" : converter(DefaultValue.Value));
         }
 

src/Spectre.Console/Prompts/TextPromptExtensions.cs

@@ -305,4 +305,50 @@ public static TextPrompt<T> WithConverter<T>(this TextPrompt<T> obj, Func<T, str
         obj.Converter = displaySelector;
         return obj;
     }
+
+    /// <summary>
+    /// Sets the style in which the default value is displayed.
+    /// </summary>
+    /// <typeparam name="T">The prompt result type.</typeparam>
+    /// <param name="obj">The prompt.</param>
+    /// <param name="style">The default value style.</param>
+    /// <returns>The same instance so that multiple calls can be chained.</returns>
+    public static TextPrompt<T> DefaultValueStyle<T>(this TextPrompt<T> obj, Style style)
+    {
+        if (obj is null)
+        {
+            throw new ArgumentNullException(nameof(obj));
+        }
+
+        if (style is null)
+        {
+            throw new ArgumentNullException(nameof(style));
+        }
+
+        obj.DefaultValueStyle = style;
+        return obj;
+    }
+
+    /// <summary>
+    /// Sets the style in which the list of choices is displayed.
+    /// </summary>
+    /// <typeparam name="T">The prompt result type.</typeparam>
+    /// <param name="obj">The prompt.</param>
+    /// <param name="style">The style to use for displaying the choices.</param>
+    /// <returns>The same instance so that multiple calls can be chained.</returns>
+    public static TextPrompt<T> ChoicesStyle<T>(this TextPrompt<T> obj, Style style)
+    {
+        if (obj is null)
+        {
+            throw new ArgumentNullException(nameof(obj));
+        }
+
+        if (style is null)
+        {
+            throw new ArgumentNullException(nameof(style));
+        }
+
+        obj.ChoicesStyle = style;
+        return obj;
+    }
 }

test/Spectre.Console.Tests/Expectations/Prompts/Text/ChoicesStyleNotSet.Output.verified.txt

@@ -0,0 +1 @@
+Enter Value: [Choice 1/Choice 2]: Choice 2

test/Spectre.Console.Tests/Expectations/Prompts/Text/ChoicesStyleSet.Output.verified.txt

@@ -0,0 +1 @@
+Enter Value: [Choice 1/Choice 2]: Choice 2

test/Spectre.Console.Tests/Expectations/Prompts/Text/DefaultValueStyleNotSet.Output.verified.txt

@@ -0,0 +1 @@
+Enter Value: (default): Input

test/Spectre.Console.Tests/Expectations/Prompts/Text/DefaultValueStyleSet.Output.verified.txt

@@ -0,0 +1 @@
+Enter Value: (default): Input

test/Spectre.Console.Tests/Unit/Prompts/TextPromptTests.cs

@@ -241,4 +241,96 @@ public Task Should_Not_Append_Questionmark_Or_Colon_If_No_Choices_Are_Set()
         // Then
         return Verifier.Verify(console.Output);
     }
+
+    [Fact]
+    [Expectation("DefaultValueStyleNotSet")]
+    public Task Uses_default_style_for_default_value_if_no_style_is_set()
+    {
+        // Given
+        var console = new TestConsole
+        {
+            EmitAnsiSequences = true,
+        };
+        console.Input.PushTextWithEnter("Input");
+
+        var prompt = new TextPrompt<string>("Enter Value:")
+                .ShowDefaultValue()
+                .DefaultValue("default");
+
+        // When
+        console.Prompt(prompt);
+
+        // Then
+        return Verifier.Verify(console.Output);
+    }
+
+    [Fact]
+    [Expectation("DefaultValueStyleSet")]
+    public Task Uses_specified_default_value_style()
+    {
+        // Given
+        var console = new TestConsole
+        {
+            EmitAnsiSequences = true,
+        };
+        console.Input.PushTextWithEnter("Input");
+
+        var prompt = new TextPrompt<string>("Enter Value:")
+                .ShowDefaultValue()
+                .DefaultValue("default")
+                .DefaultValueStyle(new Style(foreground: Color.Red));
+
+        // When
+        console.Prompt(prompt);
+
+        // Then
+        return Verifier.Verify(console.Output);
+    }
+
+    [Fact]
+    [Expectation("ChoicesStyleNotSet")]
+    public Task Uses_default_style_for_choices_if_no_style_is_set()
+    {
+        // Given
+        var console = new TestConsole
+        {
+            EmitAnsiSequences = true,
+        };
+        console.Input.PushTextWithEnter("Choice 2");
+
+        var prompt = new TextPrompt<string>("Enter Value:")
+                .ShowChoices()
+                .AddChoice("Choice 1")
+                .AddChoice("Choice 2");
+
+        // When
+        console.Prompt(prompt);
+
+        // Then
+        return Verifier.Verify(console.Output);
+    }
+
+    [Fact]
+    [Expectation("ChoicesStyleSet")]
+    public Task Uses_the_specified_choices_style()
+    {
+        // Given
+        var console = new TestConsole
+        {
+            EmitAnsiSequences = true,
+        };
+        console.Input.PushTextWithEnter("Choice 2");
+
+        var prompt = new TextPrompt<string>("Enter Value:")
+                .ShowChoices()
+                .AddChoice("Choice 1")
+                .AddChoice("Choice 2")
+                .ChoicesStyle(new Style(foreground: Color.Red));
+
+        // When
+        console.Prompt(prompt);
+
+        // Then
+        return Verifier.Verify(console.Output);
+    }
 }