feature<MergeTool>: supports to use WinMerge as git.mergetool

src/Commands/Command.cs

@@ -42,6 +42,11 @@ namespace SourceGit.Commands {
         /// </summary>
         public string Args { get; set; } = "";
 
+        /// <summary>
+        ///     是否忽略错误
+        /// </summary>
+        public bool DontRaiseError { get; set; } = false;
+
         /// <summary>
         ///     使用标准错误输出
         /// </summary>
@@ -115,7 +120,7 @@ namespace SourceGit.Commands {
             proc.Close();
 
             if (!isCancelled && exitCode != 0 && errs.Count > 0) {
-                Models.Exception.Raise(string.Join("\n", errs));
+                if (!DontRaiseError) Models.Exception.Raise(string.Join("\n", errs));
                 return false;
             } else {
                 return true;

src/Models/MergeTool.cs

@@ -22,6 +22,7 @@ namespace SourceGit.Models {
             new MergeTool(3, "Tortoise Merge", "TortoiseMerge.exe", "-base:\"$BASE\" -theirs:\"$REMOTE\" -mine:\"$LOCAL\" -merged:\"$MERGED\"", FindTortoiseMerge),
             new MergeTool(4, "KDiff3", "kdiff3.exe", "\"$REMOTE\" -b \"$BASE\" \"$LOCAL\" -o \"$MERGED\"", FindKDiff3),
             new MergeTool(5, "Beyond Compare 4", "BComp.exe", "\"$REMOTE\" \"$LOCAL\" \"$BASE\" \"$MERGED\"", FindBCompare),
+            new MergeTool(6, "WinMerge", "WinMergeU.exe", "-u -e \"$REMOTE\" \"$LOCAL\" \"$MERGED\"", FindWinMerge),
         };
         
         public MergeTool(int type, string name, string exec, string cmd, Func<string> finder) {
@@ -115,5 +116,17 @@ namespace SourceGit.Models {
             var dir = Path.GetDirectoryName(exec);
             return $"{dir}\\BComp.exe";
         }
+
+        private static string FindWinMerge() {
+            var root = RegistryKey.OpenBaseKey(
+                    RegistryHive.CurrentUser,
+                    Environment.Is64BitOperatingSystem ? RegistryView.Registry64 : RegistryView.Registry32);
+
+            var merge = root.OpenSubKey(@"SOFTWARE\Thingamahoochie\WinMerge");
+            if (merge == null) return "";
+
+            var exec = merge.GetValue("Executable") as string;
+            return exec;
+        }
     }
 }

src/Views/Widgets/WorkingCopy.xaml.cs

@@ -200,6 +200,7 @@ namespace SourceGit.Views.Widgets {
 
             var cmd = new Commands.Command();
             cmd.Cwd = repo.Path;
+            cmd.DontRaiseError = true;
             cmd.Args = $"-c mergetool.sourcegit.cmd=\"\\\"{mergeExe}\\\" {merger.Cmd}\" ";
             cmd.Args += "-c mergetool.writeToTemp=true -c mergetool.keepBackup=false -c mergetool.trustExitCode=true ";
             cmd.Args += $"mergetool --tool=sourcegit {change.Path}";