Use "git cherry-pick" for implementing copy/paste of commits

We do this because
- it's closer to what you would do on the command line
- it simplifies the code a bit
- it will allow us to support cherry-picking merge commits.

Author: stefanhaller

Diff for: pkg/commands/git_commands/rebase.go

@@ -533,35 +533,15 @@ func (self *RebaseCommands) DiscardOldFileChanges(commits []*models.Commit, comm
 
 // CherryPickCommits begins an interactive rebase with the given hashes being cherry picked onto HEAD
 func (self *RebaseCommands) CherryPickCommits(commits []*models.Commit) error {
-	commitLines := lo.Map(commits, func(commit *models.Commit, _ int) string {
-		return fmt.Sprintf("%s %s", utils.ShortHash(commit.Hash), commit.Name)
-	})
-	msg := utils.ResolvePlaceholderString(
-		self.Tr.Log.CherryPickCommits,
-		map[string]string{
-			"commitLines": strings.Join(commitLines, "\n"),
-		},
-	)
-	self.os.LogCommand(msg, false)
-
-	return self.PrepareInteractiveRebaseCommand(PrepareInteractiveRebaseCommandOpts{
-		baseHashOrRoot: "HEAD",
-		instruction:    daemon.NewCherryPickCommitsInstruction(commits),
-	}).Run()
-}
-
-// CherryPickCommitsDuringRebase simply prepends the given commits to the existing git-rebase-todo file
-func (self *RebaseCommands) CherryPickCommitsDuringRebase(commits []*models.Commit) error {
-	todoLines := lo.Map(commits, func(commit *models.Commit, _ int) daemon.TodoLine {
-		return daemon.TodoLine{
-			Action: "pick",
-			Commit: commit,
-		}
-	})
+	hasMergeCommit := lo.SomeBy(commits, func(c *models.Commit) bool { return c.IsMerge() })
+	cmdArgs := NewGitCmd("cherry-pick").
+		Arg("--allow-empty").
+		ArgIf(self.version.IsAtLeast(2, 45, 0), "--empty=keep", "--keep-redundant-commits").
+		ArgIf(hasMergeCommit, "-m1").
+		Arg(lo.Reverse(lo.Map(commits, func(c *models.Commit, _ int) string { return c.Hash }))...).
+		ToArgv()
 
-	todo := daemon.TodoLinesToString(todoLines)
-	filePath := filepath.Join(self.repoPaths.worktreeGitDirPath, "rebase-merge/git-rebase-todo")
-	return utils.PrependStrToTodoFile(filePath, []byte(todo))
+	return self.cmd.New(cmdArgs).Run()
 }
 
 func (self *RebaseCommands) DropMergeCommit(commits []*models.Commit, commitIndex int) error {

Diff for: pkg/gui/controllers/helpers/cherry_pick_helper.go

@@ -77,41 +77,23 @@ func (self *CherryPickHelper) Paste() error {
 				"numCommits": strconv.Itoa(len(self.getData().CherryPickedCommits)),
 			}),
 		HandleConfirm: func() error {
-			isInRebase, err := self.c.Git().Status.IsInRebase()
-			if err != nil {
-				return err
-			}
-			if isInRebase {
-				if err := self.c.Git().Rebase.CherryPickCommitsDuringRebase(self.getData().CherryPickedCommits); err != nil {
-					return err
-				}
-				err = self.c.Refresh(types.RefreshOptions{
-					Mode: types.SYNC, Scope: []types.RefreshableView{types.REBASE_COMMITS},
-				})
-				if err != nil {
-					return err
-				}
-
-				return self.Reset()
-			}
-
 			return self.c.WithWaitingStatus(self.c.Tr.CherryPickingStatus, func(gocui.Task) error {
 				self.c.LogAction(self.c.Tr.Actions.CherryPick)
-				err := self.c.Git().Rebase.CherryPickCommits(self.getData().CherryPickedCommits)
-				err = self.rebaseHelper.CheckMergeOrRebase(err)
+				result := self.c.Git().Rebase.CherryPickCommits(self.getData().CherryPickedCommits)
+				err := self.rebaseHelper.CheckMergeOrRebase(result)
 				if err != nil {
-					return err
+					return result
 				}
 
-				// If we're in an interactive rebase at this point, it must
+				// If we're in the cherry-picking state at this point, it must
 				// be because there were conflicts. Don't clear the copied
-				// commits in this case, since we might want to abort and
-				// try pasting them again.
-				isInRebase, err = self.c.Git().Status.IsInRebase()
-				if err != nil {
-					return err
+				// commits in this case, since we might want to abort and try
+				// pasting them again.
+				isInCherryPick, result := self.c.Git().Status.IsInCherryPick()
+				if result != nil {
+					return result
 				}
-				if !isInRebase {
+				if !isInCherryPick {
 					self.getData().DidPaste = true
 					self.rerender()
 				}

Diff for: pkg/integration/tests/cherry_pick/cherry_pick_conflicts.go

@@ -69,7 +69,7 @@ var CherryPickConflicts = NewIntegrationTest(NewIntegrationTestArgs{
 			SelectNextItem().
 			PressPrimaryAction()
 
-		t.Common().ContinueOnConflictsResolved("rebase")
+		t.Common().ContinueOnConflictsResolved("cherry-pick")
 
 		t.Views().Files().IsEmpty()
 

Diff for: pkg/integration/tests/cherry_pick/cherry_pick_during_rebase.go

@@ -75,8 +75,8 @@ var CherryPickDuringRebase = NewIntegrationTest(NewIntegrationTestArgs{
 			}).
 			Lines(
 				Contains("pick  CI two"),
-				Contains("pick  CI three"),
-				Contains("      CI <-- YOU ARE HERE --- one"),
+				Contains("      CI <-- YOU ARE HERE --- three"),
+				Contains("      CI one"),
 				Contains("      CI base"),
 			).
 			Tap(func() {