feature: show EMPTY FILE instead of NO CHANGES OR ONLY EOL CHANGES when added/deleted file is an empty file (#2434)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Commands/Diff.cs

@@ -28,7 +28,7 @@ public Diff(string repo, Models.DiffOption opt, int unified, bool ignoreWhitespa
             Context = repo;
 
             var builder = new StringBuilder(256);
-            builder.Append("diff --no-color --no-ext-diff --patch ");
+            builder.Append("diff --no-color --no-ext-diff --full-index --patch ");
             if (ignoreWhitespace)
                 builder.Append("--ignore-space-change ");
             if (ignoreCRAtEOL)

src/Models/DiffResult.cs

@@ -79,6 +79,12 @@ public class ImageDiff
         public string NewImageSize => New != null ? $"{New.PixelSize.Width} x {New.PixelSize.Height}" : "0 x 0";
     }
 
+    public class EmptyFile
+    {
+        public const string SHA1 = "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391";
+        public const string SHA256 = "473a0f4c3be8a93681a267e3b1e9a7dcda1185436fe141f7749120a303721813";
+    }
+
     public class NoOrEOLChange;
 
     public class SubmoduleDiff

src/Resources/Locales/en_US.axaml

@@ -365,6 +365,7 @@
   <x:String x:Key="Text.DeleteTag.Tag" xml:space="preserve">Tag:</x:String>
   <x:String x:Key="Text.DeleteTag.WithRemote" xml:space="preserve">Delete from remote repositories</x:String>
   <x:String x:Key="Text.Diff.Binary" xml:space="preserve">BINARY DIFF</x:String>
+  <x:String x:Key="Text.Diff.EmptyFile" xml:space="preserve">EMPTY FILE</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">File Mode Changed</x:String>
   <x:String x:Key="Text.Diff.First" xml:space="preserve">First Difference</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">Ignore Whitespace Changes</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -369,6 +369,7 @@
   <x:String x:Key="Text.DeleteTag.Tag" xml:space="preserve">标签名 ：</x:String>
   <x:String x:Key="Text.DeleteTag.WithRemote" xml:space="preserve">同时删除远程仓库中的此标签</x:String>
   <x:String x:Key="Text.Diff.Binary" xml:space="preserve">二进制文件</x:String>
+  <x:String x:Key="Text.Diff.EmptyFile" xml:space="preserve">空文件</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">文件权限已变化</x:String>
   <x:String x:Key="Text.Diff.First" xml:space="preserve">首个差异</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">忽略空白符号变化</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -369,6 +369,7 @@
   <x:String x:Key="Text.DeleteTag.Tag" xml:space="preserve">標籤名稱:</x:String>
   <x:String x:Key="Text.DeleteTag.WithRemote" xml:space="preserve">同時刪除遠端存放庫中的此標籤</x:String>
   <x:String x:Key="Text.Diff.Binary" xml:space="preserve">二進位檔案</x:String>
+  <x:String x:Key="Text.Diff.EmptyFile" xml:space="preserve">空檔案</x:String>
   <x:String x:Key="Text.Diff.FileModeChanged" xml:space="preserve">檔案權限已變更</x:String>
   <x:String x:Key="Text.Diff.First" xml:space="preserve">第一個差異</x:String>
   <x:String x:Key="Text.Diff.IgnoreWhitespace" xml:space="preserve">忽略空白符號變化</x:String>

src/ViewModels/DiffContext.cs

@@ -220,6 +220,10 @@ private void LoadContent()
                     else
                         rs = latest.LFSDiff;
                 }
+                else if (IsEmptyFileHash(latest.OldHash) || IsEmptyFileHash(latest.NewHash))
+                {
+                    rs = new Models.EmptyFile();
+                }
                 else
                 {
                     rs = new Models.NoOrEOLChange();
@@ -272,6 +276,20 @@ private void LoadContent()
             };
         }
 
+        private bool IsEmptyFileHash(string hash)
+        {
+            if (string.IsNullOrEmpty(hash))
+                return false;
+
+            if (hash.Length == 40)
+                return hash.Equals(Models.EmptyFile.SHA1, StringComparison.Ordinal);
+
+            if (hash.Length == 64)
+                return hash.Equals(Models.EmptyFile.SHA256, StringComparison.Ordinal);
+
+            return false;
+        }
+
         private class Info
         {
             public string Argument { get; }

src/Views/DiffView.axaml

@@ -387,7 +387,19 @@
             <v:TextDiffView SelectedChunk="{Binding SelectedChunk, Mode=OneWay}"/>
           </DataTemplate>
 
-          <!-- Empty or only EOL changes -->
+          <!-- New Empty File -->
+          <DataTemplate DataType="m:EmptyFile">
+            <StackPanel Orientation="Vertical" VerticalAlignment="Center">
+              <Path Width="64" Height="64" Data="{StaticResource Icons.Empty}" Fill="{DynamicResource Brush.FG2}"/>
+              <TextBlock Margin="0,16,0,0"
+                         Text="{DynamicResource Text.Diff.EmptyFile}"
+                         FontSize="18" FontWeight="Bold"
+                         Foreground="{DynamicResource Brush.FG2}"
+                         HorizontalAlignment="Center"/>
+            </StackPanel>
+          </DataTemplate>
+
+          <!-- Only EOL changes -->
           <DataTemplate DataType="m:NoOrEOLChange">
             <StackPanel Orientation="Vertical" VerticalAlignment="Center">
               <Path Width="64" Height="64" Data="{StaticResource Icons.Check}" Fill="{DynamicResource Brush.FG2}"/>