feature: allow deleting multiple branches at one time (#137)

src/ViewModels/DeleteMultipleBranches.cs

@@ -0,0 +1,53 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels
+{
+    public class DeleteMultipleBranches : Popup
+    {
+        public List<Models.Branch> Targets
+        {
+            get;
+        }
+
+        public DeleteMultipleBranches(Repository repo, List<Models.Branch> branches, bool isLocal)
+        {
+            _repo = repo;
+            _isLocal = isLocal;
+            Targets = branches;
+            View = new Views.DeleteMultipleBranches() { DataContext = this };
+        }
+        
+        public override Task<bool> Sure()
+        {
+            _repo.SetWatcherEnabled(false);
+            ProgressDescription = "Deleting multiple branches...";
+
+            return Task.Run(() =>
+            {
+                if (_isLocal)
+                {
+                    foreach (var target in Targets)
+                    {
+                        SetProgressDescription($"Deleting local branch : {target.Name}");
+                        Commands.Branch.DeleteLocal(_repo.FullPath, target.Name);
+                    }
+                }
+                else
+                {
+                    foreach (var target in Targets)
+                    {
+                        SetProgressDescription($"Deleting remote branch : {target.Remote}/{target.Name}");
+                        Commands.Branch.DeleteRemote(_repo.FullPath, target.Remote, target.Name);
+                    }
+                }
+
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return true;
+            });
+        }
+
+        private Repository _repo = null;
+        private bool _isLocal = false;
+    }
+}