feature<CommitViewer>: show line numbers in file preview and remove limitation for line counts

src/Git/Commit.cs

@@ -30,6 +30,14 @@ namespace SourceGit.Git {
             public string SHA { get; set; }
         }
 
+        /// <summary>
+        ///     Line of text in file.
+        /// </summary>
+        public class Line {
+            public int No { get; set; }
+            public string Content { get; set; }
+        }
+
         /// <summary>
         ///     SHA
         /// </summary>
@@ -224,10 +232,10 @@ namespace SourceGit.Git {
         /// <param name="repo"></param>
         /// <param name="file"></param>
         /// <returns></returns>
-        public string GetTextFileContent(Repository repo, string file, out bool isBinary) {
+        public List<Line> GetTextFileContent(Repository repo, string file, out bool isBinary) {
-            var data = new List<string>();
+            var data = new List<Line>();
-            var count = 0;
             var binary = false;
+            var count = 0;
 
             repo.RunCommand($"diff 4b825dc642cb6eb9a060e54bf8d69288fbee4904 {SHA} --numstat -- \"{file}\"", line => {
                 if (REG_TESTBINARY.IsMatch(line)) binary = true;
@@ -237,29 +245,21 @@ namespace SourceGit.Git {
                 var errs = repo.RunCommand($"show {SHA}:\"{file}\"", line => {
                     if (binary) return;
 
-                    count++;
-                    if (data.Count >= 1000) return;
-
                     if (line.IndexOf('\0') >= 0) {
                         binary = true;
                         data.Clear();
-                        data.Add("BINARY FILE PREVIEW NOT SUPPORTED!");
                         return;
                     }
 
-                    data.Add(line);
+                    count++;
+                    data.Add(new Line() { No = count, Content = line });
                 });
 
                 if (errs != null) App.RaiseError(errs);
             }
 
-            if (!binary && count > 1000) {
-                data.Add("...");
-                data.Add($"Total {count} lines. Hide {count-1000} lines.");
-            }
-
             isBinary = binary;
-            return string.Join("\n", data);
+            return data;
         }
 
         /// <summary>

src/UI/CommitViewer.xaml

@@ -11,6 +11,26 @@
              mc:Ignorable="d" 
              d:DesignHeight="450" d:DesignWidth="800"
              Unloaded="Cleanup">
+    <UserControl.Resources>
+        <Style x:Key="Style.DataGridRow.NoBringIntoView" TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
+            <EventSetter Event="RequestBringIntoView" Handler="OnPreviewRequestBringIntoView"/>
+        </Style>
+
+        <Style x:Key="Style.DataGridText.LineNumber" TargetType="{x:Type TextBlock}">
+            <Setter Property="HorizontalAlignment" Value="Right"/>
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="Padding" Value="8,0"/>
+            <Setter Property="FontSize" Value="12"/>
+        </Style>
+
+        <Style x:Key="Style.DataGridText.Content" TargetType="{x:Type TextBlock}">
+            <Setter Property="HorizontalAlignment" Value="Left"/>
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="Padding" Value="4,0,0,0"/>
+            <Setter Property="FontSize" Value="12"/>
+        </Style>
+    </UserControl.Resources>
+    
     <TabControl>
         <TabItem Header="INFORMATION">
             <Grid>
@@ -427,16 +447,7 @@
 
                 <Border Grid.Column="2" BorderThickness="1" Margin="2,0" BorderBrush="{StaticResource Brush.Border2}">
                     <Grid>
-                        <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
+                        <Grid x:Name="previewEditor" SizeChanged="OnPreviewSizeChanged" TextElement.FontFamily="Consolas" TextElement.Foreground="{StaticResource Brush.FG}"/>
-                            <TextBlock 
-                                FontSize="10pt"
-                                FontFamily="Consolas"
-                                Padding="8"
-                                Opacity="0.8"
-                                Background="{StaticResource Brush.BG2}"
-                                Foreground="{StaticResource Brush.FG}"
-                                x:Name="filePreview"/>
-                        </ScrollViewer>
 
                         <StackPanel x:Name="maskRevision" Orientation="Vertical" VerticalAlignment="Center" HorizontalAlignment="Center" Visibility="Collapsed">
                             <Path x:Name="iconPreviewRevision" Width="64" Height="64" Style="{StaticResource Style.Icon}" Data="{StaticResource Icon.Submodule}" Fill="{StaticResource Brush.FG2}"/>

src/UI/CommitViewer.xaml.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Globalization;
 using System.IO;
 using System.Security.Cryptography;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Data;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
@@ -423,12 +425,105 @@ namespace SourceGit.UI {
 
             Dispatcher.Invoke(() => {
                 fileTree.ItemsSource = fileTreeSource;
-                filePreview.Text = "";
+                previewEditor.Children.Clear();
             });
         }
 
+        private void LayoutPreview(List<Git.Commit.Line> data) {
+            var maxLineNumber = $"{data.Count + 1}";
+            var formatted = new FormattedText(
+                maxLineNumber,
+                CultureInfo.CurrentCulture,
+                FlowDirection.LeftToRight,
+                new Typeface(new FontFamily("Consolas"), FontStyles.Normal, FontWeights.Normal, FontStretches.Normal),
+                12.0,
+                Brushes.Black,
+                VisualTreeHelper.GetDpi(this).PixelsPerDip);
+
+            var grid = new DataGrid();
+            grid.SetValue(Grid.RowProperty, 1);
+            grid.RowHeight = 16.0;
+            grid.FrozenColumnCount = 1;
+            grid.ContextMenuOpening += OnPreviewContextMenuOpening;
+            grid.RowStyle = FindResource("Style.DataGridRow.NoBringIntoView") as Style;
+
+            var colLineNumber = new DataGridTextColumn();
+            colLineNumber.IsReadOnly = true;
+            colLineNumber.Binding = new Binding("No");
+            colLineNumber.ElementStyle = FindResource("Style.DataGridText.LineNumber") as Style;
+            colLineNumber.Width = new DataGridLength(formatted.Width + 16, DataGridLengthUnitType.Pixel);
+            grid.Columns.Add(colLineNumber);
+
+            var offset = formatted.Width + 16;
+            if (data.Count * 16 > previewEditor.ActualHeight) offset += 8;
+
+            var colContent = new DataGridTextColumn();
+            colContent.IsReadOnly = true;
+            colContent.Binding = new Binding("Content");
+            colContent.ElementStyle = FindResource("Style.DataGridText.Content") as Style;
+            colContent.MinWidth = previewEditor.ActualWidth - offset;
+            colContent.Width = DataGridLength.SizeToCells;
+            grid.Columns.Add(colContent);
+
+            var splitter = new System.Windows.Shapes.Rectangle();
+            splitter.Width = 1;
+            splitter.Fill = FindResource("Brush.Border2") as Brush;
+            splitter.HorizontalAlignment = HorizontalAlignment.Left;
+            splitter.Margin = new Thickness(formatted.Width + 15, 0, 0, 0);
+
+            grid.ItemsSource = data;
+            previewEditor.Children.Add(grid);
+            previewEditor.Children.Add(splitter);
+        }
+
+        private void OnPreviewContextMenuOpening(object sender, ContextMenuEventArgs e) {
+            var grid = sender as DataGrid;
+            if (grid == null) return;
+
+            var menu = new ContextMenu();
+            var copy = new MenuItem();
+            copy.Header = "Copy";
+            copy.Click += (o, ev) => {
+                var items = grid.SelectedItems;
+                if (items.Count == 0) return;
+
+                var builder = new StringBuilder();
+                foreach (var item in items) {
+                    var line = item as Git.Commit.Line;
+                    if (line == null) continue;
+
+                    builder.Append(line.Content);
+                    builder.AppendLine();
+                }
+
+                Clipboard.SetText(builder.ToString());
+            };
+            menu.Items.Add(copy);
+            menu.IsOpen = true;
+            e.Handled = true;
+        }
+
+        private void OnPreviewRequestBringIntoView(object sender, RequestBringIntoViewEventArgs e) {
+            e.Handled = true;
+        }
+
+        private void OnPreviewSizeChanged(object sender, SizeChangedEventArgs e) {
+            if (previewEditor.Children.Count == 0) return;
+
+            var totalWidth = previewEditor.ActualWidth;
+            var totalHeight = previewEditor.ActualHeight;
+            var editor = previewEditor.Children[0] as DataGrid;
+            var minWidth = totalWidth - editor.NonFrozenColumnsViewportHorizontalOffset;
+            var desireHeight = editor.Items.Count * editor.RowHeight;
+            if (desireHeight > totalHeight) minWidth -= 8;
+
+            editor.Columns[1].MinWidth = minWidth;
+            editor.Columns[1].Width = DataGridLength.SizeToCells;
+            editor.UpdateLayout();
+        }
+
         private async void FileTreeItemSelected(object sender, RoutedPropertyChangedEventArgs<object> e) {
-            filePreview.Text = "";
+            previewEditor.Children.Clear();
             maskPreviewNotSupported.Visibility = Visibility.Collapsed;
             maskRevision.Visibility = Visibility.Collapsed;
 
@@ -450,7 +545,7 @@ namespace SourceGit.UI {
                         if (isBinary) {
                             Dispatcher.Invoke(() => maskPreviewNotSupported.Visibility = Visibility.Visible);
                         } else {
-                            Dispatcher.Invoke(() => filePreview.Text = data);
+                            Dispatcher.Invoke(() => LayoutPreview(data));
                         }
                     });
                 }

src/UI/DiffViewer.xaml

@@ -7,7 +7,7 @@
              mc:Ignorable="d"
              FontFamily="Consolas">
     <UserControl.Resources>
-        <Style x:Key="Style.DataGridRow.TextChange" TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
+        <Style x:Key="Style.DataGridRow.NoBringIntoView" TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource Style.DataGridRow}">
             <EventSetter Event="RequestBringIntoView" Handler="OnLineRequestBringIntoView"/>
         </Style>
 

src/UI/DiffViewer.xaml.cs

@@ -421,7 +421,7 @@ namespace SourceGit.UI {
             grid.RowHeight = 16.0;
             grid.FrozenColumnCount = lineNumbers.Length;
             grid.ContextMenuOpening += OnTextChangeContextMenuOpening;
-            grid.RowStyle = FindResource("Style.DataGridRow.TextChange") as Style;
+            grid.RowStyle = FindResource("Style.DataGridRow.NoBringIntoView") as Style;
 
             foreach (var number in lineNumbers) {
                 var colLineNumber = new DataGridTextColumn();