Adding git fetch button

Author: StanleyGoldman

src/GitHub.Api/Git/IRepository.cs

@@ -12,6 +12,7 @@ interface IRepository : IEquatable<IRepository>
         ITask SetupRemote(string remoteName, string remoteUrl);
         ITask Pull();
         ITask Push();
+        ITask Fetch();
         ITask ListLocks();
         ITask RequestLock(string file);
         ITask ReleaseLock(string file, bool force);

src/GitHub.Api/Git/Repository.cs

@@ -88,6 +88,11 @@ public ITask Push()
             return repositoryManager.Push(CurrentRemote.Value.Name, CurrentBranch);
         }
 
+        public ITask Fetch()
+        {
+            return repositoryManager.Fetch(CurrentRemote.Value.Name);
+        }
+
         public ITask ListLocks()
         {
             return repositoryManager.ListLocks(false);

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/HistoryView.cs

@@ -30,6 +30,13 @@ class HistoryView : Subview
         private const string ClearSelectionButton = "×";
         private const string NoRepoTitle = "No Git repository found for this project";
         private const string NoRepoDescription = "Initialize a Git repository to track changes and collaborate with others.";
+        private const string FetchActionTitle = "Fetch Changes";
+        private const string FetchButtonText = "Fetch";
+        private const string FetchFailureDescription = "Could not fetch changes";
+        private const string FetchConfirmTitle = "Fetch Changes?";
+        private const string FetchConfirmDescription = "Would you like to fetch changes from remote '{0}'?";
+        private const string FetchConfirmYes = "Fetch";
+        private const string FetchConfirmCancel = "Cancel";
         private const int HistoryExtraItemCount = 10;
         private const float MaxChangelistHeightRatio = .2f;
 
@@ -321,8 +328,19 @@ public void OnEmbeddedGUI()
 
                 GUILayout.FlexibleSpace();
 
+                GUI.enabled = currentRemote != null;
+                var fetchClicked = GUILayout.Button(FetchButtonText, Styles.HistoryToolbarButtonStyle);
+                GUI.enabled = true;
+                if (fetchClicked &&
+                    EditorUtility.DisplayDialog(FetchConfirmTitle,
+                        String.Format(FetchConfirmDescription, currentRemote),
+                        FetchConfirmYes,
+                        FetchConfirmCancel)
+                )
+                {
+                    Fetch();
+                }
 
-                // Pull / Push buttons
                 var pullButtonText = statusBehind > 0 ? String.Format(PullButtonCount, statusBehind) : PullButton;
                 GUI.enabled = currentRemote != null;
                 var pullClicked = GUILayout.Button(pullButtonText, Styles.HistoryToolbarButtonStyle);
@@ -708,6 +726,21 @@ private void Push()
                 .Start();
         }
 
+        private void Fetch()
+        {
+            var remote = Repository.CurrentRemote.HasValue ? Repository.CurrentRemote.Value.Name : String.Empty;
+            Repository
+                .Fetch()
+                .FinallyInUI((success, e) => {
+                    if (!success)
+                    {
+                        EditorUtility.DisplayDialog(FetchActionTitle, FetchFailureDescription,
+                            Localization.Cancel);
+                    }
+                })
+                .Start();
+        }
+
         void drawTimelineRectAroundIconRect(Rect parentRect, Rect iconRect)
         {
             Color timelineBarColor = new Color(0.51F, 0.51F, 0.51F, 0.2F);