feature: supports to copy multiple commits message (sourcegit-scm#1857)

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

Author: love-linger

src/ViewModels/Histories.cs

@@ -358,10 +358,11 @@ public async Task InteractiveRebaseAsync(Models.Commit commit, Models.Interactiv
                 await App.ShowDialog(new InteractiveRebase(_repo, on, prefill));
         }
 
-        public async Task CopyCommitFullMessageAsync(Models.Commit commit)
+        public async Task<string> GetCommitFullMessageAsync(Models.Commit commit)
         {
-            var message = await new Commands.QueryCommitFullMessage(_repo.FullPath, commit.SHA).GetResultAsync();
-            await App.CopyTextAsync(message);
+            return await new Commands.QueryCommitFullMessage(_repo.FullPath, commit.SHA)
+                .GetResultAsync()
+                .ConfigureAwait(false);
         }
 
         public async Task<Models.Commit> CompareWithHeadAsync(Models.Commit commit)

src/Views/Histories.axaml.cs

@@ -438,11 +438,29 @@ private ContextMenu CreateContextMenuForMultipleCommits(ViewModels.Repository re
                 e.Handled = true;
             };
 
+            var copyMessage = new MenuItem();
+            copyMessage.Header = App.Text("CommitCM.CopyCommitMessage");
+            copyMessage.Icon = App.CreateMenuIcon("Icons.Info");
+            copyMessage.Click += async (_, e) =>
+            {
+                var vm = DataContext as ViewModels.Histories;
+                var messages = new List<string>();
+                foreach (var c in selected)
+                {
+                    var message = await vm.GetCommitFullMessageAsync(c);
+                    messages.Add(message);
+                }
+
+                await App.CopyTextAsync(string.Join("\n-----\n", messages));
+                e.Handled = true;
+            };
+
             var copy = new MenuItem();
             copy.Header = App.Text("Copy");
             copy.Icon = App.CreateMenuIcon("Icons.Copy");
             copy.Items.Add(copyShas);
             copy.Items.Add(copyInfos);
+            copy.Items.Add(copyMessage);
             menu.Items.Add(copy);
             return menu;
         }
@@ -871,7 +889,8 @@ private ContextMenu CreateContextMenuForSingleCommit(ViewModels.Repository repo,
             copyMessage.Icon = App.CreateMenuIcon("Icons.Info");
             copyMessage.Click += async (_, e) =>
             {
-                await vm.CopyCommitFullMessageAsync(commit);
+                var message = await vm.GetCommitFullMessageAsync(commit);
+                await App.CopyTextAsync(message);
                 e.Handled = true;
             };