Show a confirmation when changing a config that can't be auto-reloaded

pkg/gui/gui.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"path/filepath"
+	"reflect"
 	"sort"
 	"strings"
 	"sync"
@@ -331,13 +332,18 @@ func (gui *Gui) onNewRepo(startArgs appTypes.StartArgs, contextKey types.Context
 
 	gui.g.SetFocusHandler(func(Focused bool) error {
 		if Focused {
+			oldConfig := gui.Config.GetUserConfig()
 			reloadErr, didChange := gui.Config.ReloadChangedUserConfigFiles()
 			if didChange && reloadErr == nil {
 				gui.c.Log.Info("User config changed - reloading")
 				reloadErr = gui.onUserConfigLoaded()
 				if err := gui.resetKeybindings(); err != nil {
 					return err
 				}
+
+				if err := gui.checkForChangedConfigsThatDontAutoReload(oldConfig, gui.Config.GetUserConfig()); err != nil {
+					return err
+				}
 			}
 
 			gui.c.Log.Info("Receiving focus - refreshing")
@@ -434,6 +440,54 @@ func (gui *Gui) onUserConfigLoaded() error {
 	return nil
 }
 
+func (gui *Gui) checkForChangedConfigsThatDontAutoReload(oldConfig *config.UserConfig, newConfig *config.UserConfig) error {
+	configsThatDontAutoReload := []string{
+		"Git.AutoFetch",
+		"Git.AutoRefresh",
+		"Refresher.RefreshInterval",
+		"Refresher.FetchInterval",
+		"Update.Method",
+		"Update.Days",
+	}
+
+	changedConfigs := []string{}
+	for _, config := range configsThatDontAutoReload {
+		old := reflect.ValueOf(oldConfig).Elem()
+		new := reflect.ValueOf(newConfig).Elem()
+		fieldNames := strings.Split(config, ".")
+		// navigate to the leaves in old and new config
+		for _, fieldName := range fieldNames {
+			old = old.FieldByName(fieldName)
+			new = new.FieldByName(fieldName)
+		}
+		// if the value has changed, ...
+		if !old.Equal(new) {
+			// ... convert the field names to the user-facing names by
+			// lower-casing the first letter, ...
+			userFacingName := strings.Join(lo.Map(fieldNames, func(f string, _ int) string {
+				return strings.ToLower(f[:1]) + f[1:]
+			}), ".")
+			// ... and append it to the list of changed configs
+			changedConfigs = append(changedConfigs, userFacingName)
+		}
+	}
+
+	if len(changedConfigs) == 0 {
+		return nil
+	}
+
+	message := utils.ResolvePlaceholderString(
+		gui.c.Tr.NonReloadableConfigWarning,
+		map[string]string{
+			"configs": strings.Join(changedConfigs, "\n"),
+		},
+	)
+	return gui.c.Confirm(types.ConfirmOpts{
+		Title:  gui.c.Tr.NonReloadableConfigWarningTitle,
+		Prompt: message,
+	})
+}
+
 // resetState reuses the repo state from our repo state map, if the repo was
 // open before; otherwise it creates a new one.
 func (gui *Gui) resetState(startArgs appTypes.StartArgs) types.Context {

pkg/i18n/english.go

@@ -225,6 +225,8 @@ type TranslationSet struct {
 	MergeToolPrompt                       string
 	IntroPopupMessage                     string
 	DeprecatedEditConfigWarning           string
+	NonReloadableConfigWarningTitle       string
+	NonReloadableConfigWarning            string
 	GitconfigParseErr                     string
 	EditFile                              string
 	EditFileTooltip                       string
@@ -985,6 +987,10 @@ for up-to-date information how to configure your editor.
 
 `
 
+const englishNonReloadableConfigWarning = `The following config settings were changed, but the change doesn't take effect immediately. Please quit and restart lazygit for changes to take effect:
+
+{{configs}}`
+
 // exporting this so we can use it in tests
 func EnglishTranslationSet() *TranslationSet {
 	return &TranslationSet{
@@ -1199,6 +1205,8 @@ func EnglishTranslationSet() *TranslationSet {
 		MergeToolPrompt:                      "Are you sure you want to open `git mergetool`?",
 		IntroPopupMessage:                    englishIntroPopupMessage,
 		DeprecatedEditConfigWarning:          englishDeprecatedEditConfigWarning,
+		NonReloadableConfigWarningTitle:      "Config changed",
+		NonReloadableConfigWarning:           englishNonReloadableConfigWarning,
 		GitconfigParseErr:                    `Gogit failed to parse your gitconfig file due to the presence of unquoted '\' characters. Removing these should fix the issue.`,
 		EditFile:                             `Edit file`,
 		EditFileTooltip:                      "Open file in external editor.",