Add AllowEmptyInput flag to PromptOpts

Most of our prompts don't (shouldn't) allow empty input, but most callers didn't
check, and would run into cryptic errors when the user pressed enter at an empty
prompt (e.g. when creating a new branch). Now we simply don't allow hitting
enter in this case, and show an error toast instead.

This behavior is opt-out, because there are a few cases where empty input is
supported (e.g. creating a stash).

pkg/gui/controllers/files_controller.go

@@ -1211,6 +1211,7 @@ func (self *FilesController) handleStashSave(stashFunc func(message string) erro
 			self.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.STASH, types.FILES}})
 			return nil
 		},
+		AllowEmptyInput: true,
 	})
 
 	return nil

pkg/gui/controllers/helpers/confirmation_helper.go

@@ -44,7 +44,12 @@ func (self *ConfirmationHelper) wrappedConfirmationFunction(cancel goContext.Can
 	}
 }
 
-func (self *ConfirmationHelper) wrappedPromptConfirmationFunction(cancel goContext.CancelFunc, function func(string) error, getResponse func() string) func() error {
+func (self *ConfirmationHelper) wrappedPromptConfirmationFunction(
+	cancel goContext.CancelFunc,
+	function func(string) error,
+	getResponse func() string,
+	allowEmptyInput bool,
+) func() error {
 	return func() error {
 		if self.c.GocuiGui().IsPasting {
 			// The user is pasting multi-line text into a prompt; we don't want to handle the
@@ -54,8 +59,15 @@ func (self *ConfirmationHelper) wrappedPromptConfirmationFunction(cancel goConte
 			return nil
 		}
 
+		response := getResponse()
+
+		if response == "" && !allowEmptyInput {
+			self.c.ErrorToast(self.c.Tr.PromptInputCannotBeEmptyToast)
+			return nil
+		}
+
 		return self.closeAndCallConfirmationFunction(cancel, func() error {
-			return function(getResponse())
+			return function(response)
 		})
 	}
 }
@@ -235,12 +247,14 @@ func (self *ConfirmationHelper) setConfirmationKeyBindings(cancel goContext.Canc
 
 func (self *ConfirmationHelper) setPromptKeyBindings(cancel goContext.CancelFunc, opts types.CreatePopupPanelOpts) {
 	onConfirm := self.wrappedPromptConfirmationFunction(cancel, opts.HandleConfirmPrompt,
-		func() string { return self.c.Views().Prompt.TextArea.GetContent() })
+		func() string { return self.c.Views().Prompt.TextArea.GetContent() },
+		opts.AllowEmptyInput)
 
 	onSuggestionConfirm := self.wrappedPromptConfirmationFunction(
 		cancel,
 		opts.HandleConfirmPrompt,
 		self.getSelectedSuggestionValue,
+		opts.AllowEmptyInput,
 	)
 
 	onClose := self.wrappedConfirmationFunction(cancel, opts.HandleClose)

pkg/gui/controllers/helpers/credentials_helper.go

@@ -41,6 +41,7 @@ func (self *CredentialsHelper) PromptUserForCredential(passOrUname oscommands.Cr
 
 				return nil
 			},
+			AllowEmptyInput: true,
 		})
 
 		return nil

pkg/gui/controllers/helpers/worktree_helper.go

@@ -130,6 +130,7 @@ func (self *WorktreeHelper) NewWorktreeCheckout(base string, canCheckoutBase boo
 
 						return f()
 					},
+					AllowEmptyInput: true,
 				})
 
 				return nil
@@ -147,6 +148,7 @@ func (self *WorktreeHelper) NewWorktreeCheckout(base string, canCheckoutBase boo
 
 					return f()
 				},
+				AllowEmptyInput: false,
 			})
 
 			return nil

pkg/gui/controllers/stash_controller.go

@@ -209,6 +209,7 @@ func (self *StashController) handleRenameStashEntry(stashEntry *models.StashEntr
 			self.c.Refresh(types.RefreshOptions{Scope: []types.RefreshableView{types.STASH}})
 			return nil
 		},
+		AllowEmptyInput: true,
 	})
 
 	return nil

pkg/gui/popup/popup_handler.go

@@ -139,6 +139,7 @@ func (self *PopupHandler) Prompt(opts types.PromptOpts) {
 		HandleDeleteSuggestion: opts.HandleDeleteSuggestion,
 		FindSuggestionsFunc:    opts.FindSuggestionsFunc,
 		AllowEditSuggestion:    opts.AllowEditSuggestion,
+		AllowEmptyInput:        opts.AllowEmptyInput,
 		Mask:                   opts.Mask,
 	})
 }

pkg/gui/services/custom_commands/handler_creator.go

@@ -125,6 +125,7 @@ func (self *HandlerCreator) inputPrompt(prompt *config.CustomCommandPrompt, wrap
 		HandleConfirm: func(str string) error {
 			return wrappedF(str)
 		},
+		AllowEmptyInput: true,
 	})
 
 	return nil

pkg/gui/types/common.go

@@ -172,6 +172,7 @@ type CreatePopupPanelOpts struct {
 	FindSuggestionsFunc func(string) []*Suggestion
 	Mask                bool
 	AllowEditSuggestion bool
+	AllowEmptyInput     bool
 }
 
 type ConfirmOpts struct {
@@ -190,6 +191,7 @@ type PromptOpts struct {
 	FindSuggestionsFunc func(string) []*Suggestion
 	HandleConfirm       func(string) error
 	AllowEditSuggestion bool
+	AllowEmptyInput     bool
 	// CAPTURE THIS
 	HandleClose            func() error
 	HandleDeleteSuggestion func(int) error

pkg/i18n/english.go

@@ -618,6 +618,7 @@ type TranslationSet struct {
 	MustStashTitle                        string
 	ConfirmationTitle                     string
 	PromptTitle                           string
+	PromptInputCannotBeEmptyToast         string
 	PrevPage                              string
 	NextPage                              string
 	GotoTop                               string
@@ -1713,6 +1714,7 @@ func EnglishTranslationSet() *TranslationSet {
 		MustStashTitle:                   "Must stash",
 		ConfirmationTitle:                "Confirmation panel",
 		PromptTitle:                      "Input prompt",
+		PromptInputCannotBeEmptyToast:    "Empty input is not allowed",
 		PrevPage:                         "Previous page",
 		NextPage:                         "Next page",
 		GotoTop:                          "Scroll to top",