refactor<*>: rewrite all with AvaloniaUI

src/ViewModels/Init.cs

@@ -0,0 +1,41 @@
+using System.IO;
+using System.Threading.Tasks;
+
+namespace SourceGit.ViewModels {
+    public class Init : Popup {
+        public string TargetPath {
+            get => _targetPath;
+            set => SetProperty(ref _targetPath, value);
+        }
+
+        public Init(string path) {
+            TargetPath = path;
+            View = new Views.Init() { DataContext = this };
+        }
+
+        public override Task<bool> Sure() {
+            return Task.Run(() => {
+                SetProgressDescription($"Initialize git repository at: '{_targetPath}'");
+                var succ = new Commands.Init(HostPageId, _targetPath).Exec();
+                if (!succ) return false;
+
+                var gitDir = Path.GetFullPath(Path.Combine(_targetPath, ".git"));
+                
+                CallUIThread(() => {
+                    var repo = Preference.AddRepository(_targetPath, gitDir);
+                    var node = new RepositoryNode() {
+                        Id = _targetPath,
+                        Name = Path.GetFileName(_targetPath),
+                        Bookmark = 0,
+                        IsRepository = true,
+                    };
+                    Preference.AddNode(node);
+                });
+
+                return true;
+            });
+        }
+
+        private string _targetPath;
+    }
+}