Basic Subtree support

User can create Subtree from selected remote branch

pkg/commands/git_commands/branch.go

@@ -284,3 +284,12 @@ func (self *BranchCommands) IsBranchMerged(branch *models.Branch, mainBranches *
 
 	return stdout == "", nil
 }
+
+// Creates a Subtree from the selected branch
+func (self *BranchCommands) CreateSubtree(remoteName string, branch string) error {
+	cmdArgs := NewGitCmd("subtree").
+		Arg("add", fmt.Sprintf("--prefix=%s", remoteName), remoteName, branch).
+		ToArgv()
+
+	return self.cmd.New(cmdArgs).Run()
+}

pkg/config/user_config.go

@@ -465,6 +465,7 @@ type KeybindingBranchesConfig struct {
 	SetUpstream            string `yaml:"setUpstream"`
 	FetchRemote            string `yaml:"fetchRemote"`
 	SortOrder              string `yaml:"sortOrder"`
+	CreateSubtree          string `yaml:"createSubtree"`
 }
 
 type KeybindingWorktreesConfig struct {
@@ -904,6 +905,7 @@ func GetDefaultConfig() *UserConfig {
 				SetUpstream:            "u",
 				FetchRemote:            "f",
 				SortOrder:              "s",
+				CreateSubtree:          "S",
 			},
 			Worktrees: KeybindingWorktreesConfig{
 				ViewWorktreeOptions: "w",

pkg/gui/controllers/remote_branches_controller.go

@@ -102,6 +102,14 @@ func (self *RemoteBranchesController) GetKeybindings(opts types.KeybindingsOpts)
 			GetDisabledReason: self.require(self.singleItemSelected()),
 			Description:       self.c.Tr.OpenDiffTool,
 		},
+		{
+			Key:               opts.GetKey(opts.Config.Branches.CreateSubtree),
+			Handler:           self.withItem(self.createSubtree),
+			GetDisabledReason: self.require(self.singleItemSelected()),
+			Description:       self.c.Tr.Subtree,
+			Tooltip:           self.c.Tr.SubtreeToolTip,
+			DisplayOnScreen:   true,
+		},
 	}
 }
 
@@ -198,3 +206,20 @@ func (self *RemoteBranchesController) newLocalBranch(selectedBranch *models.Remo
 func (self *RemoteBranchesController) checkoutBranch(selectedBranch *models.RemoteBranch) error {
 	return self.c.Helpers().Refs.CheckoutRemoteBranch(selectedBranch.FullName(), selectedBranch.Name)
 }
+
+func (self *RemoteBranchesController) createSubtree(branch *models.RemoteBranch) error {
+	self.c.Confirm(types.ConfirmOpts{
+		Title:  self.c.Tr.Subtree,
+		Prompt: "Create subtree from" + " '" + branch.Name + "'?",
+		HandleConfirm: func() error {
+			self.c.LogAction(self.c.Tr.Actions.CreateSubtree)
+			if err := self.c.Git().Branch.CreateSubtree(branch.RemoteName, branch.Name); err != nil {
+				return err
+			}
+
+			return self.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.BRANCHES, types.REMOTES}})
+		},
+	})
+
+	return nil
+}

pkg/i18n/english.go

@@ -248,6 +248,7 @@ type TranslationSet struct {
 	CopyPullRequestURL                    string
 	NoBranchOnRemote                      string
 	Fetch                                 string
+	Subtree                               string
 	FetchTooltip                          string
 	NoAutomaticGitFetchTitle              string
 	NoAutomaticGitFetchBody               string
@@ -515,6 +516,7 @@ type TranslationSet struct {
 	ForceTag                              string
 	ForceTagPrompt                        string
 	FetchRemoteTooltip                    string
+	SubtreeToolTip                        string
 	FetchingRemoteStatus                  string
 	CheckoutCommit                        string
 	CheckoutCommitTooltip                 string
@@ -918,6 +920,7 @@ type Actions struct {
 	SetBranchUpstream                 string
 	AddRemote                         string
 	RemoveRemote                      string
+	CreateSubtree                     string
 	UpdateRemote                      string
 	ApplyPatch                        string
 	Stash                             string
@@ -1232,6 +1235,7 @@ func EnglishTranslationSet() *TranslationSet {
 		CopyPullRequestURL:                   `Copy pull request URL to clipboard`,
 		NoBranchOnRemote:                     `This branch doesn't exist on remote. You need to push it to remote first.`,
 		Fetch:                                `Fetch`,
+		Subtree:                              "Subtree",
 		FetchTooltip:                         "Fetch changes from remote.",
 		NoAutomaticGitFetchTitle:             `No automatic git fetch`,
 		NoAutomaticGitFetchBody:              `Lazygit can't use "git fetch" in a private repo; use 'f' in the files panel to run "git fetch" manually`,
@@ -1508,6 +1512,7 @@ func EnglishTranslationSet() *TranslationSet {
 		ForceTag:               "Force Tag",
 		ForceTagPrompt:         "The tag '{{.tagName}}' exists already. Press {{.cancelKey}} to cancel, or {{.confirmKey}} to overwrite.",
 		FetchRemoteTooltip:     "Fetch updates from the remote repository. This retrieves new commits and branches without merging them into your local branches.",
+		SubtreeToolTip:         "Create a subtree from the selected branch.",
 		FetchingRemoteStatus:   "Fetching remote",
 		CheckoutCommit:         "Checkout commit",
 		CheckoutCommitTooltip:  "Checkout the selected commit as a detached HEAD.",