refactor<*>: rewrite all codes...

src/Commands/Pull.cs

@@ -0,0 +1,48 @@
+using System;
+
+namespace SourceGit.Commands {
+
+    /// <summary>
+    ///     拉回
+    /// </summary>
+    public class Pull : Command {
+        private Action<string> handler = null;
+        private bool needStash = false;
+
+        public Pull(string repo, string remote, string branch, bool useRebase, bool autoStash, Action<string> onProgress) {
+            Cwd = repo;
+            Args = "-c credential.helper=manager pull --verbose --progress --tags ";
+            TraitErrorAsOutput = true;
+            handler = onProgress;
+
+            if (useRebase) Args += "--rebase ";
+            if (autoStash) {
+                if (useRebase) Args += "--autostash ";
+                else needStash = true;
+            }
+
+            Args += $"{remote} {branch}";
+        }
+
+        public bool Run() {
+            if (needStash) {
+                var changes = new LocalChanges(Cwd).Result();
+                if (changes.Count > 0) {
+                    if (!new Stash(Cwd).Push(null, "PULL_AUTO_STASH", true)) {
+                        return false;
+                    }
+                } else {
+                    needStash = false;
+                }
+            }
+
+            var succ = Exec();
+            if (needStash) new Stash(Cwd).Pop("stash@{0}");
+            return succ;
+        }
+
+        public override void OnReadline(string line) {
+            handler?.Invoke(line);
+        }
+    }
+}