Add command to rebase onto base branch (#3615)

- **PR Description**

In the rebase menu, add a command "Rebase onto base branch". This makes
it more convenient to rebase onto master (or main), because
- you don't need to bring your local version of the base branch up to
date first
- you don't have to remember which of your main branches (e.g. "main",
"devel", or "1.0-hotfixes") your current branch is based on.

This is sitting on top of #3614.

Closes #3546.

- **Please check if the PR fulfills these requirements**

* [x] Cheatsheets are up-to-date (run `go generate ./...`)
* [x] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [x] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [x] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [x] Docs have been updated if necessary
* [x] You've read through your own file changes for silly mistakes etc

pkg/gui/controllers/branches_controller.go

@@ -100,14 +100,13 @@ func (self *BranchesController) GetKeybindings(opts types.KeybindingsOpts) []*ty
 			DisplayOnScreen:   true,
 		},
 		{
-			Key:     opts.GetKey(opts.Config.Branches.RebaseBranch),
-			Handler: opts.Guards.OutsideFilterMode(self.rebase),
-			GetDisabledReason: self.require(
-				self.singleItemSelected(self.notRebasingOntoSelf),
-			),
-			Description:     self.c.Tr.RebaseBranch,
-			Tooltip:         self.c.Tr.RebaseBranchTooltip,
-			DisplayOnScreen: true,
+			Key:               opts.GetKey(opts.Config.Branches.RebaseBranch),
+			Handler:           opts.Guards.OutsideFilterMode(self.withItem(self.rebase)),
+			GetDisabledReason: self.require(self.singleItemSelected()),
+			Description:       self.c.Tr.RebaseBranch,
+			Tooltip:           self.c.Tr.RebaseBranchTooltip,
+			OpensMenu:         true,
+			DisplayOnScreen:   true,
 		},
 		{
 			Key:               opts.GetKey(opts.Config.Branches.MergeIntoCurrentBranch),
@@ -633,19 +632,8 @@ func (self *BranchesController) merge() error {
 	return self.c.Helpers().MergeAndRebase.MergeRefIntoCheckedOutBranch(selectedBranchName)
 }
 
-func (self *BranchesController) rebase() error {
-	selectedBranchName := self.context().GetSelected().Name
-	return self.c.Helpers().MergeAndRebase.RebaseOntoRef(selectedBranchName)
-}
-
-func (self *BranchesController) notRebasingOntoSelf(branch *models.Branch) *types.DisabledReason {
-	selectedBranchName := branch.Name
-	checkedOutBranch := self.c.Helpers().Refs.GetCheckedOutRef().Name
-	if selectedBranchName == checkedOutBranch {
-		return &types.DisabledReason{Text: self.c.Tr.CantRebaseOntoSelf}
-	}
-
-	return nil
+func (self *BranchesController) rebase(branch *models.Branch) error {
+	return self.c.Helpers().MergeAndRebase.RebaseOntoRef(branch.Name)
 }
 
 func (self *BranchesController) fastForward(branch *models.Branch) error {

pkg/gui/controllers/helpers/merge_and_rebase_helper.go

@@ -234,11 +234,29 @@ func (self *MergeAndRebaseHelper) PromptToContinueRebase() error {
 }
 
 func (self *MergeAndRebaseHelper) RebaseOntoRef(ref string) error {
-	checkedOutBranch := self.refsHelper.GetCheckedOutRef().Name
+	checkedOutBranch := self.refsHelper.GetCheckedOutRef()
+	checkedOutBranchName := self.refsHelper.GetCheckedOutRef().Name
+	var disabledReason, baseBranchDisabledReason *types.DisabledReason
+	if checkedOutBranchName == ref {
+		disabledReason = &types.DisabledReason{Text: self.c.Tr.CantRebaseOntoSelf}
+	}
+
+	baseBranch, err := self.c.Git().Loaders.BranchLoader.GetBaseBranch(checkedOutBranch, self.refsHelper.c.Model().MainBranches)
+	if err != nil {
+		return err
+	}
+	if baseBranch == "" {
+		baseBranch = self.c.Tr.CouldNotDetermineBaseBranch
+		baseBranchDisabledReason = &types.DisabledReason{Text: self.c.Tr.CouldNotDetermineBaseBranch}
+	}
+
 	menuItems := []*types.MenuItem{
 		{
-			Label: self.c.Tr.SimpleRebase,
-			Key:   's',
+			Label: utils.ResolvePlaceholderString(self.c.Tr.SimpleRebase,
+				map[string]string{"ref": ref},
+			),
+			Key:            's',
+			DisabledReason: disabledReason,
 			OnPress: func() error {
 				self.c.LogAction(self.c.Tr.Actions.RebaseBranch)
 				return self.c.WithWaitingStatus(self.c.Tr.RebasingStatus, func(task gocui.Task) error {
@@ -258,9 +276,12 @@ func (self *MergeAndRebaseHelper) RebaseOntoRef(ref string) error {
 			},
 		},
 		{
-			Label:   self.c.Tr.InteractiveRebase,
-			Key:     'i',
-			Tooltip: self.c.Tr.InteractiveRebaseTooltip,
+			Label: utils.ResolvePlaceholderString(self.c.Tr.InteractiveRebase,
+				map[string]string{"ref": ref},
+			),
+			Key:            'i',
+			DisabledReason: disabledReason,
+			Tooltip:        self.c.Tr.InteractiveRebaseTooltip,
 			OnPress: func() error {
 				self.c.LogAction(self.c.Tr.Actions.RebaseBranch)
 				baseCommit := self.c.Modes().MarkedBaseCommit.GetHash()
@@ -279,15 +300,39 @@ func (self *MergeAndRebaseHelper) RebaseOntoRef(ref string) error {
 				return self.c.PushContext(self.c.Contexts().LocalCommits)
 			},
 		},
+		{
+			Label: utils.ResolvePlaceholderString(self.c.Tr.RebaseOntoBaseBranch,
+				map[string]string{"baseBranch": ShortBranchName(baseBranch)},
+			),
+			Key:            'b',
+			DisabledReason: baseBranchDisabledReason,
+			Tooltip:        self.c.Tr.RebaseOntoBaseBranchTooltip,
+			OnPress: func() error {
+				self.c.LogAction(self.c.Tr.Actions.RebaseBranch)
+				return self.c.WithWaitingStatus(self.c.Tr.RebasingStatus, func(task gocui.Task) error {
+					baseCommit := self.c.Modes().MarkedBaseCommit.GetHash()
+					var err error
+					if baseCommit != "" {
+						err = self.c.Git().Rebase.RebaseBranchFromBaseCommit(baseBranch, baseCommit)
+					} else {
+						err = self.c.Git().Rebase.RebaseBranch(baseBranch)
+					}
+					err = self.CheckMergeOrRebase(err)
+					if err == nil {
+						return self.ResetMarkedBaseCommit()
+					}
+					return err
+				})
+			},
+		},
 	}
 
 	title := utils.ResolvePlaceholderString(
 		lo.Ternary(self.c.Modes().MarkedBaseCommit.GetHash() != "",
 			self.c.Tr.RebasingFromBaseCommitTitle,
 			self.c.Tr.RebasingTitle),
 		map[string]string{
-			"checkedOutBranch": checkedOutBranch,
-			"ref":              ref,
+			"checkedOutBranch": checkedOutBranchName,
 		},
 	)
 

pkg/i18n/english.go

@@ -289,7 +289,9 @@ type TranslationSet struct {
 	RebasingFromBaseCommitTitle           string
 	SimpleRebase                          string
 	InteractiveRebase                     string
+	RebaseOntoBaseBranch                  string
 	InteractiveRebaseTooltip              string
+	RebaseOntoBaseBranchTooltip           string
 	MustSelectTodoCommits                 string
 	ConfirmMerge                          string
 	FwdNoUpstream                         string
@@ -1253,11 +1255,13 @@ func EnglishTranslationSet() TranslationSet {
 		KeybindingsMenuSectionLocal:          "Local",
 		KeybindingsMenuSectionGlobal:         "Global",
 		KeybindingsMenuSectionNavigation:     "Navigation",
-		RebasingTitle:                        "Rebase '{{.checkedOutBranch}}' onto '{{.ref}}'",
-		RebasingFromBaseCommitTitle:          "Rebase '{{.checkedOutBranch}}' from marked base onto '{{.ref}}'",
-		SimpleRebase:                         "Simple rebase",
-		InteractiveRebase:                    "Interactive rebase",
+		RebasingTitle:                        "Rebase '{{.checkedOutBranch}}'",
+		RebasingFromBaseCommitTitle:          "Rebase '{{.checkedOutBranch}}' from marked base",
+		SimpleRebase:                         "Simple rebase onto '{{.ref}}'",
+		InteractiveRebase:                    "Interactive rebase onto '{{.ref}}'",
+		RebaseOntoBaseBranch:                 "Rebase onto base branch ({{.baseBranch}})",
 		InteractiveRebaseTooltip:             "Begin an interactive rebase with a break at the start, so you can update the TODO commits before continuing.",
+		RebaseOntoBaseBranchTooltip:          "Rebase the checked out branch onto its base branch (i.e. the closest main branch).",
 		MustSelectTodoCommits:                "When rebasing, this action only works on a selection of TODO commits.",
 		ConfirmMerge:                         "Are you sure you want to merge '{{.selectedBranch}}' into '{{.checkedOutBranch}}'?",
 		FwdNoUpstream:                        "Cannot fast-forward a branch with no upstream",
@@ -1443,7 +1447,7 @@ func EnglishTranslationSet() TranslationSet {
 		ViewUpstreamResetOptions:             "Reset checked-out branch onto {{.upstream}}",
 		ViewUpstreamResetOptionsTooltip:      "View options for resetting the checked-out branch onto {{upstream}}. Note: this will not reset the selected branch onto the upstream, it will reset the checked-out branch onto the upstream.",
 		ViewUpstreamRebaseOptions:            "Rebase checked-out branch onto {{.upstream}}",
-		ViewUpstreamRebaseOptionsTooltip:     "View options for rebasing the checked-out branch onto {{upstream}}. Note: this will not rebase the selected branch onto the upstream, it will rebased the checked-out branch onto the upstream.",
+		ViewUpstreamRebaseOptionsTooltip:     "View options for rebasing the checked-out branch onto {{upstream}}. Note: this will not rebase the selected branch onto the upstream, it will rebase the checked-out branch onto the upstream.",
 		UpstreamGenericName:                  "upstream of selected branch",
 		SetUpstreamTitle:                     "Set upstream branch",
 		SetUpstreamMessage:                   "Are you sure you want to set the upstream branch of '{{.checkedOut}}' to '{{.selected}}'",

pkg/i18n/polish.go

@@ -274,10 +274,10 @@ func polishTranslationSet() TranslationSet {
 		KeybindingsMenuSectionLocal:         "Lokalne",
 		KeybindingsMenuSectionGlobal:        "Globalne",
 		KeybindingsMenuSectionNavigation:    "Nawigacja",
-		RebasingTitle:                       "Rebase '{{.checkedOutBranch}}' na '{{.ref}}'",
-		RebasingFromBaseCommitTitle:         "Rebase '{{.checkedOutBranch}}' od oznaczonego commita bazowego na '{{.ref}}'",
-		SimpleRebase:                        "Prosty rebase",
-		InteractiveRebase:                   "Interaktywny rebase",
+		RebasingTitle:                       "Rebase '{{.checkedOutBranch}}'",
+		RebasingFromBaseCommitTitle:         "Rebase '{{.checkedOutBranch}}' od oznaczonego commita bazowego",
+		SimpleRebase:                        "Prosty rebase na '{{.ref}}'",
+		InteractiveRebase:                   "Interaktywny rebase na '{{.ref}}'",
 		InteractiveRebaseTooltip:            "Rozpocznij interaktywny rebase z przerwaniem na początku, abyś mógł zaktualizować commity TODO przed kontynuacją.",
 		MustSelectTodoCommits:               "Podczas rebase ta akcja działa tylko na zaznaczonych commitach TODO.",
 		ConfirmMerge:                        "Czy na pewno chcesz scalić '{{.selectedBranch}}' z '{{.checkedOutBranch}}'?",

pkg/i18n/russian.go

@@ -226,9 +226,9 @@ func RussianTranslationSet() TranslationSet {
 		ConflictsResolved:                   "Все конфликты слияния разрешены. Продолжить?",
 		Continue:                            "Продолжить",
 		Keybindings:                         "Связки клавиш",
-		RebasingTitle:                       "Перебазировать '{{.checkedOutBranch}}' на '{{.ref}}'",
-		SimpleRebase:                        "Простая перебазировка",
-		InteractiveRebase:                   "Интерактивная перебазировка",
+		RebasingTitle:                       "Перебазировать '{{.checkedOutBranch}}'",
+		SimpleRebase:                        "Простая перебазировка на '{{.ref}}'",
+		InteractiveRebase:                   "Интерактивная перебазировка на '{{.ref}}'",
 		InteractiveRebaseTooltip:            "Начать интерактивную перебазировку с перерыва в начале, чтобы можно было обновить TODO коммиты, прежде чем продолжить.",
 		ConfirmMerge:                        "Вы уверены, что хотите to merge '{{.selectedBranch}}' into '{{.checkedOutBranch}}'?",
 		FwdNoUpstream:                       "Невозможно перемотать ветку без upstream-ветки",

pkg/i18n/traditional_chinese.go

@@ -256,9 +256,9 @@ func traditionalChineseTranslationSet() TranslationSet {
 		ConflictsResolved:                   "所有合併衝突都已解決。是否繼續？",
 		Continue:                            "確認",
 		Keybindings:                         "鍵盤快捷鍵",
-		RebasingTitle:                       "將 '{{.checkedOutBranch}}' 變基至 '{{.ref}}'",
-		SimpleRebase:                        "簡單變基",
-		InteractiveRebase:                   "互動變基",
+		RebasingTitle:                       "將 '{{.checkedOutBranch}}'",
+		SimpleRebase:                        "簡單變基 變基至 '{{.ref}}'",
+		InteractiveRebase:                   "互動變基 變基至 '{{.ref}}'",
 		InteractiveRebaseTooltip:            "開始一個互動變基，以中斷開始，這樣你可以在繼續之前更新TODO提交",
 		ConfirmMerge:                        "是否將 '{{.selectedBranch}}' 合併至 '{{.checkedOutBranch}}' ？",
 		FwdNoUpstream:                       "無法快進無上游分支",

pkg/integration/tests/branch/rebase.go

@@ -31,7 +31,7 @@ var Rebase = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'first-change-branch' onto 'second-change-branch'")).
+			Title(Equals("Rebase 'first-change-branch'")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_abort_on_conflict.go

@@ -31,7 +31,7 @@ var RebaseAbortOnConflict = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'first-change-branch' onto 'second-change-branch'")).
+			Title(Equals("Rebase 'first-change-branch'")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_and_drop.go

@@ -37,7 +37,7 @@ var RebaseAndDrop = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'first-change-branch' onto 'second-change-branch'")).
+			Title(Equals("Rebase 'first-change-branch'")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_cancel_on_conflict.go

@@ -31,7 +31,7 @@ var RebaseCancelOnConflict = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'first-change-branch' onto 'second-change-branch'")).
+			Title(Equals("Rebase 'first-change-branch'")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_copied_branch.go

@@ -42,7 +42,7 @@ var RebaseCopiedBranch = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch).
 			Tap(func() {
 				t.ExpectPopup().Menu().
-					Title(Equals("Rebase 'branch2' onto 'master'")).
+					Title(Equals("Rebase 'branch2'")).
 					Select(Contains("Simple rebase")).
 					Confirm()
 			})

pkg/integration/tests/branch/rebase_does_not_autosquash.go

@@ -40,7 +40,7 @@ var RebaseDoesNotAutosquash = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'my-branch' onto 'master'")).
+			Title(Equals("Rebase 'my-branch'")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_from_marked_base.go

@@ -61,7 +61,7 @@ var RebaseFromMarkedBase = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals("Rebase 'active-branch' from marked base onto 'target-branch'")).
+			Title(Equals("Rebase 'active-branch' from marked base")).
 			Select(Contains("Simple rebase")).
 			Confirm()
 

pkg/integration/tests/branch/rebase_onto_base_branch.go

@@ -0,0 +1,53 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var RebaseOntoBaseBranch = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Rebase the current branch onto its base branch",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig: func(config *config.AppConfig) {
+		config.UserConfig.Gui.ShowDivergenceFromBaseBranch = "arrowAndNumber"
+	},
+	SetupRepo: func(shell *Shell) {
+		shell.
+			EmptyCommit("master 1").
+			EmptyCommit("master 2").
+			EmptyCommit("master 3").
+			NewBranchFrom("feature", "master^").
+			EmptyCommit("feature 1").
+			EmptyCommit("feature 2")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Commits().Lines(
+			Contains("feature 2"),
+			Contains("feature 1"),
+			Contains("master 2"),
+			Contains("master 1"),
+		)
+
+		t.Views().Branches().
+			Focus().
+			Lines(
+				Contains("feature ↓1").IsSelected(),
+				Contains("master"),
+			).
+			Press(keys.Branches.RebaseBranch)
+
+		t.ExpectPopup().Menu().
+			Title(Equals("Rebase 'feature'")).
+			Select(Contains("Rebase onto base branch (master)")).
+			Confirm()
+
+		t.Views().Commits().Lines(
+			Contains("feature 2"),
+			Contains("feature 1"),
+			Contains("master 3"),
+			Contains("master 2"),
+			Contains("master 1"),
+		)
+	},
+})

pkg/integration/tests/branch/rebase_to_upstream.go

@@ -67,7 +67,7 @@ var RebaseToUpstream = NewIntegrationTest(NewIntegrationTestArgs{
 					Select(Contains("Rebase checked-out branch onto origin/master...")).
 					Confirm()
 				t.ExpectPopup().Menu().
-					Title(Equals("Rebase 'target' onto 'origin/master'")).
+					Title(Equals("Rebase 'target'")).
 					Select(Contains("Simple rebase")).
 					Confirm()
 			})

pkg/integration/tests/interactive_rebase/advanced_interactive_rebase.go

@@ -39,7 +39,7 @@ var AdvancedInteractiveRebase = NewIntegrationTest(NewIntegrationTestArgs{
 			Press(keys.Branches.RebaseBranch)
 
 		t.ExpectPopup().Menu().
-			Title(Equals(fmt.Sprintf("Rebase '%s' onto '%s'", TOP_BRANCH, BASE_BRANCH))).
+			Title(Equals(fmt.Sprintf("Rebase '%s'", TOP_BRANCH))).
 			Select(Contains("Interactive rebase")).
 			Confirm()
 		t.Views().Commits().

pkg/integration/tests/test_list.go

@@ -51,6 +51,7 @@ var tests = []*components.IntegrationTest{
 	branch.RebaseCopiedBranch,
 	branch.RebaseDoesNotAutosquash,
 	branch.RebaseFromMarkedBase,
+	branch.RebaseOntoBaseBranch,
 	branch.RebaseToUpstream,
 	branch.Rename,
 	branch.Reset,