code_style: only Commands.DiffTool needs synchronous method Exec

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

Author: love-linger

src/Commands/Command.cs

@@ -37,19 +37,6 @@ public enum EditorType
         public bool RaiseError { get; set; } = true;
         public Models.ICommandLog Log { get; set; } = null;
 
-        public void Exec()
-        {
-            try
-            {
-                var start = CreateGitStartInfo(false);
-                Process.Start(start);
-            }
-            catch (Exception ex)
-            {
-                App.RaiseException(Context, ex.Message);
-            }
-        }
-
         public async Task<bool> ExecAsync()
         {
             Log?.AppendLine($"$ git {Args}\n");
@@ -171,7 +158,7 @@ protected async Task<Result> ReadToEndAsync()
             return rs;
         }
 
-        private ProcessStartInfo CreateGitStartInfo(bool redirect)
+        protected ProcessStartInfo CreateGitStartInfo(bool redirect)
         {
             var start = new ProcessStartInfo();
             start.FileName = Native.OS.GitExecutable;

src/Commands/DiffTool.cs

@@ -1,4 +1,7 @@
-namespace SourceGit.Commands
+using System;
+using System.Diagnostics;
+
+namespace SourceGit.Commands
 {
     public class DiffTool : Command
     {
@@ -28,7 +31,14 @@ public void Open()
                 Args = $"-c difftool.sourcegit.cmd={cmd.Quoted()} difftool --tool=sourcegit --no-prompt {_option}";
             }
 
-            Exec();
+            try
+            {
+                Process.Start(CreateGitStartInfo(false));
+            }
+            catch (Exception ex)
+            {
+                App.RaiseException(Context, ex.Message);
+            }
         }
 
         private Models.DiffOption _option;