Feat/progressbar valueformatter

src/Spectre.Console/Extensions/BarChartExtensions.cs

@@ -116,6 +116,37 @@
         return chart;
     }
 
+    public static BarChart UseValueFormatter(this BarChart chart, Func<double, CultureInfo, string>? func)
+    {
+        if (chart is null)
+        {
+            throw new ArgumentNullException(nameof(chart));
+        }
+
+        chart.ValueFormatter = func;
+        return chart;
+    }
+
+    /// <summary>
+    /// Tags will be shown.
+    /// </summary>
+    /// <param name="chart">The breakdown chart.</param>
+    /// <param name="func">The value formatter to use.</param>
+    /// <returns>The same instance so that multiple calls can be chained.</returns>
+    public static BarChart UseValueFormatter(this BarChart chart, Func<double, string>? func)
+    {
+        if (chart is null)
+        {
+            throw new ArgumentNullException(nameof(chart));
+        }
+
+        chart.ValueFormatter = func != null
+            ? (value, _) => func(value)
+            : null;
+
+        return chart;
+    }
+
     /// <summary>
     /// Sets the width of the bar chart.
     /// </summary>

src/Spectre.Console/Widgets/Charts/BarChart.cs

@@ -43,6 +43,11 @@ public sealed class BarChart : Renderable, IHasCulture
     /// <remarks>Defaults to null, which corresponds to largest value in chart.</remarks>
     public double? MaxValue { get; set; }
 
+    /// <summary>
+    /// Gets or sets the function used to format the values of the bar chart.
+    /// </summary>
+    public Func<double, CultureInfo, string>? ValueFormatter { get; set; }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="BarChart"/> class.
     /// </summary>
@@ -90,6 +95,7 @@ protected override IEnumerable<Segment> Render(RenderOptions options, int maxWid
                     AsciiBar = '█',
                     ShowValue = ShowValues,
                     Culture = Culture,
+                    ValueFormatter = ValueFormatter,
                 });
         }
 

src/Spectre.Console/Widgets/ProgressBar.cs

@@ -15,6 +15,7 @@ internal sealed class ProgressBar : Renderable, IHasCulture
     public bool ShowValue { get; set; }
     public bool IsIndeterminate { get; set; }
     public CultureInfo? Culture { get; set; }
+    public Func<double, CultureInfo, string>? ValueFormatter { get; set; }
 
     public Style CompletedStyle { get; set; } = Color.Yellow;
     public Style FinishedStyle { get; set; } = Color.Green;
@@ -50,7 +51,7 @@ protected override IEnumerable<Segment> Render(RenderOptions options, int maxWid
         var barCount = Math.Max(0, (int)(width * (completedBarCount / MaxValue)));
 
         // Show value?
-        var value = completedBarCount.ToString(Culture ?? CultureInfo.InvariantCulture);
+        var value = ValueFormatter != null ? ValueFormatter(completedBarCount, Culture ?? CultureInfo.InvariantCulture) : completedBarCount.ToString(Culture ?? CultureInfo.InvariantCulture);
         if (ShowValue)
         {
             barCount = barCount - value.Length - 1;

test/Spectre.Console.Tests/Expectations/Widgets/ProgressBar/Formatted.Output.verified.txt

@@ -0,0 +1 @@
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9,000

test/Spectre.Console.Tests/Expectations/Widgets/ProgressBar/Render.Output.verified.txt

@@ -0,0 +1 @@
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 9000

test/Spectre.Console.Tests/Unit/Widgets/ProgressBarTests.cs

@@ -0,0 +1,51 @@
+namespace Spectre.Console.Tests.Unit;
+
+[UsesVerify]
+[ExpectationPath("Widgets/ProgressBar")]
+public class ProgressBarTests
+{
+    [Fact]
+    [Expectation("Render")]
+    public async Task Should_Render_Correctly()
+    {
+        // Given
+        var console = new TestConsole();
+
+        var bar = new ProgressBar()
+        {
+            Width = 60,
+            Value = 9000,
+            MaxValue = 9000,
+            ShowValue = true
+        };
+
+        // When
+        console.Write(bar);
+
+        // Then
+        await Verifier.Verify(console.Output);
+    }
+
+    [Fact]
+    [Expectation("Formatted")]
+    public async Task Should_Render_ValueFormatted()
+    {
+        // Given
+        var console = new TestConsole();
+
+        var bar = new ProgressBar()
+        {
+            Width = 60,
+            Value = 9000,
+            MaxValue = 9000,
+            ShowValue = true,
+            ValueFormatter = (value, _) => value.ToString("N0"),
+        };
+
+        // When
+        console.Write(bar);
+
+        // Then
+        await Verifier.Verify(console.Output);
+    }
+}