refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/Merge.cs

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class MergeMode {
+        public string Name { get; set; }
+        public string Desc { get; set; }
+        public string Arg { get; set; }
+
+        public MergeMode(string n, string d, string a) {
+            Name = n;
+            Desc = d;
+            Arg = a;
+        }
+    }
+
+    public class Merge : Popup {
+        public string Source {
+            get;
+            private set;
+        }
+
+        public string Into {
+            get;
+            private set;
+        }
+
+        public List<MergeMode> Modes {
+            get;
+            private set;
+        }
+
+        public MergeMode SelectedMode {
+            get;
+            set;
+        }
+
+        public Merge(Repository repo, string source, string into) {
+            _repo = repo;
+            Source = source;
+            Into = into;
+            Modes = new List<MergeMode>() {
+                new MergeMode("Default", "Fast-forward if possible", ""),
+                new MergeMode("No Fast-forward", "Always create a merge commit", "--no-ff"),
+                new MergeMode("Squash", "Use '--squash'", "--squash"),
+                new MergeMode("Don't commit", "Merge without commit", "--no-commit"),
+            };
+            SelectedMode = Modes[0];
+            View = new Views.Merge() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            _repo.SetWatcherEnabled(false);
+            return Task.Run(() => {
+                SetProgressDescription($"Merging '{Source}' into '{Into}' ...");
+                var succ = new Commands.Merge(_repo.FullPath, Source, SelectedMode.Arg, SetProgressDescription).Exec();
+                CallUIThread(() => _repo.SetWatcherEnabled(true));
+                return succ;
+            });
+        }
+
+        private Repository _repo = null;
+    }
+}