feature: add worktree support (#205)

src/ViewModels/PruneWorktrees.cs

@@ -0,0 +1,28 @@
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels
+{
+    public class PruneWorktrees : Popup
+    {
+        public PruneWorktrees(Repository repo)
+        {
+            _repo = repo;
+            View = new Views.PruneWorktrees() { DataContext = this };
+        }
+
+        public override Task<bool> Sure()
+        {
+            _repo.SetWatcherEnabled(false);
+            ProgressDescription = "Prune worktrees ...";
+
+            return Task.Run(() =>
+            {
+                new Commands.Worktree(_repo.FullPath).Prune(SetProgressDescription);
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}