Add new command "Checkout previous branch"

Author: kyu08

pkg/config/user_config.go

@@ -497,6 +497,7 @@ type KeybindingBranchesConfig struct {
 	CopyPullRequestURL     string `yaml:"copyPullRequestURL"`
 	CheckoutBranchByName   string `yaml:"checkoutBranchByName"`
 	ForceCheckoutBranch    string `yaml:"forceCheckoutBranch"`
+	CheckoutPreviousBranch string `yaml:"checkoutPreviousBranch"`
 	RebaseBranch           string `yaml:"rebaseBranch"`
 	RenameBranch           string `yaml:"renameBranch"`
 	MergeIntoCurrentBranch string `yaml:"mergeIntoCurrentBranch"`
@@ -957,6 +958,7 @@ func GetDefaultConfig() *UserConfig {
 				ViewPullRequestOptions: "O",
 				CheckoutBranchByName:   "c",
 				ForceCheckoutBranch:    "F",
+				CheckoutPreviousBranch: "-",
 				RebaseBranch:           "r",
 				RenameBranch:           "R",
 				MergeIntoCurrentBranch: "M",

pkg/gui/controllers/branches_controller.go

@@ -89,6 +89,11 @@ func (self *BranchesController) GetKeybindings(opts types.KeybindingsOpts) []*ty
 			Description: self.c.Tr.CheckoutByName,
 			Tooltip:     self.c.Tr.CheckoutByNameTooltip,
 		},
+		{
+			Key:         opts.GetKey(opts.Config.Branches.CheckoutPreviousBranch),
+			Handler:     self.checkoutPreviousBranch,
+			Description: self.c.Tr.CheckoutPreviousBranch,
+		},
 		{
 			Key:               opts.GetKey(opts.Config.Branches.ForceCheckoutBranch),
 			Handler:           self.forceCheckout,
@@ -483,6 +488,11 @@ func (self *BranchesController) forceCheckout() error {
 	return nil
 }
 
+func (self *BranchesController) checkoutPreviousBranch() error {
+	self.c.LogAction(self.c.Tr.Actions.CheckoutBranch)
+	return self.c.Helpers().Refs.CheckoutRef("-", types.CheckoutRefOptions{})
+}
+
 func (self *BranchesController) checkoutByName() error {
 	self.c.Prompt(types.PromptOpts{
 		Title:               self.c.Tr.BranchName + ":",

pkg/i18n/english.go

@@ -139,6 +139,7 @@ type TranslationSet struct {
 	ForceCheckoutTooltip                  string
 	CheckoutByName                        string
 	CheckoutByNameTooltip                 string
+	CheckoutPreviousBranch                string
 	RemoteBranchCheckoutTitle             string
 	RemoteBranchCheckoutPrompt            string
 	CheckoutTypeNewBranch                 string
@@ -1182,6 +1183,7 @@ func EnglishTranslationSet() *TranslationSet {
 		ForceCheckoutTooltip:                 "Force checkout selected branch. This will discard all local changes in your working directory before checking out the selected branch.",
 		CheckoutByName:                       "Checkout by name",
 		CheckoutByNameTooltip:                "Checkout by name. In the input box you can enter '-' to switch to the last branch.",
+		CheckoutPreviousBranch:               "Checkout previous branch",
 		RemoteBranchCheckoutTitle:            "Checkout {{.branchName}}",
 		RemoteBranchCheckoutPrompt:           "How would you like to check out this branch?",
 		CheckoutTypeNewBranch:                "New local branch",

pkg/integration/tests/branch/checkout_previous_branch.go

@@ -0,0 +1,51 @@
+package branch
+
+import (
+	"github.com/jesseduffield/lazygit/pkg/config"
+	. "github.com/jesseduffield/lazygit/pkg/integration/components"
+)
+
+var CheckoutPreviousBranch = NewIntegrationTest(NewIntegrationTestArgs{
+	Description:  "Checkout to the previous branch using the checkout previous branch functionality",
+	ExtraCmdArgs: []string{},
+	Skip:         false,
+	SetupConfig:  func(config *config.AppConfig) {},
+	SetupRepo: func(shell *Shell) {
+		shell.
+			CreateNCommits(3).
+			NewBranch("previous-branch").
+			EmptyCommit("previous commit").
+			Checkout("master").
+			EmptyCommit("master commit")
+	},
+	Run: func(t *TestDriver, keys config.KeybindingConfig) {
+		t.Views().Branches().
+			Focus().
+			Lines(
+				Contains("master").IsSelected(),
+				Contains("previous-branch"),
+			)
+
+		// Press the checkout previous branch key (should checkout previous-branch)
+		t.Views().Branches().
+			Press(keys.Branches.CheckoutPreviousBranch).
+			Lines(
+				Contains("previous-branch").IsSelected(),
+				Contains("master"),
+			)
+
+		// Verify we're on previous-branch
+		t.Git().CurrentBranchName("previous-branch")
+
+		// Press again to go back to master
+		t.Views().Branches().
+			Press(keys.Branches.CheckoutPreviousBranch).
+			Lines(
+				Contains("master").IsSelected(),
+				Contains("previous-branch"),
+			)
+
+		// Verify we're back on master
+		t.Git().CurrentBranchName("master")
+	},
+})

pkg/integration/tests/test_list.go

@@ -40,6 +40,7 @@ var tests = []*components.IntegrationTest{
 	bisect.Skip,
 	branch.CheckoutAutostash,
 	branch.CheckoutByName,
+	branch.CheckoutPreviousBranch,
 	branch.CreateTag,
 	branch.Delete,
 	branch.DeleteMultiple,