Optimize a map creation

No need to re-create the AvailableLanguages map every time the function is
called, we can simply change it to a global variable. Unfortunately, this means
that it's now writeable, instead of being immutable, but as nothing is ever
modifying it, it's ok.

Author: jvoisin

internal/locale/catalog.go

@@ -12,7 +12,7 @@ import (
 type translationDict map[string]interface{}
 type catalog map[string]translationDict
 
-var defaultCatalog = make(catalog, len(AvailableLanguages()))
+var defaultCatalog = make(catalog, len(AvailableLanguages))
 
 //go:embed translations/*.json
 var translationFiles embed.FS
@@ -31,7 +31,7 @@ func GetTranslationDict(language string) (translationDict, error) {
 func LoadCatalogMessages() error {
 	var err error
 
-	for language := range AvailableLanguages() {
+	for language := range AvailableLanguages {
 		defaultCatalog[language], err = loadTranslationFile(language)
 		if err != nil {
 			return err

internal/locale/catalog_test.go

@@ -39,7 +39,7 @@ func TestLoadCatalog(t *testing.T) {
 }
 
 func TestAllKeysHaveValue(t *testing.T) {
-	for language := range AvailableLanguages() {
+	for language := range AvailableLanguages {
 		messages, err := loadTranslationFile(language)
 		if err != nil {
 			t.Fatalf(`Unable to load translation messages for language %q`, language)
@@ -71,7 +71,7 @@ func TestMissingTranslations(t *testing.T) {
 		t.Fatal(`Unable to parse reference language`)
 	}
 
-	for language := range AvailableLanguages() {
+	for language := range AvailableLanguages {
 		if language == refLang {
 			continue
 		}
@@ -90,7 +90,7 @@ func TestMissingTranslations(t *testing.T) {
 }
 
 func TestTranslationFilePluralForms(t *testing.T) {
-	for language := range AvailableLanguages() {
+	for language := range AvailableLanguages {
 		messages, err := loadTranslationFile(language)
 		if err != nil {
 			t.Fatalf(`Unable to load translation messages for language %q`, language)

internal/locale/locale.go

@@ -24,26 +24,24 @@ var numberOfPluralFormsPerLanguage = map[string]int{
 	"id_ID": 1,
 }
 
-// AvailableLanguages returns the list of available languages.
-func AvailableLanguages() map[string]string {
-	return map[string]string{
-		"en_US": "English",
-		"es_ES": "Español",
-		"fr_FR": "Français",
-		"de_DE": "Deutsch",
-		"pl_PL": "Polski",
-		"pt_BR": "Português Brasileiro",
-		"zh_CN": "简体中文",
-		"zh_TW": "繁體中文",
-		"nl_NL": "Nederlands",
-		"ru_RU": "Русский",
-		"it_IT": "Italiano",
-		"ja_JP": "日本語",
-		"tr_TR": "Türkçe",
-		"el_EL": "Ελληνικά",
-		"fi_FI": "Suomi",
-		"hi_IN": "हिन्दी",
-		"uk_UA": "Українська",
-		"id_ID": "Bahasa Indonesia",
-	}
+// AvailableLanguages is the list of available languages.
+var AvailableLanguages = map[string]string{
+	"en_US": "English",
+	"es_ES": "Español",
+	"fr_FR": "Français",
+	"de_DE": "Deutsch",
+	"pl_PL": "Polski",
+	"pt_BR": "Português Brasileiro",
+	"zh_CN": "简体中文",
+	"zh_TW": "繁體中文",
+	"nl_NL": "Nederlands",
+	"ru_RU": "Русский",
+	"it_IT": "Italiano",
+	"ja_JP": "日本語",
+	"tr_TR": "Türkçe",
+	"el_EL": "Ελληνικά",
+	"fi_FI": "Suomi",
+	"hi_IN": "हिन्दी",
+	"uk_UA": "Українська",
+	"id_ID": "Bahasa Indonesia",
 }

internal/ui/settings_show.go

@@ -71,7 +71,7 @@ func (h *handler) showSettingsPage(w http.ResponseWriter, r *http.Request) {
 		"MarkAsReadOnlyOnPlayerCompletion":           form.MarkAsReadOnlyOnPlayerCompletion,
 	})
 	view.Set("themes", model.Themes())
-	view.Set("languages", locale.AvailableLanguages())
+	view.Set("languages", locale.AvailableLanguages)
 	view.Set("timezones", timezones)
 	view.Set("menu", "settings")
 	view.Set("user", user)

internal/ui/settings_update.go

@@ -44,7 +44,7 @@ func (h *handler) updateSettings(w http.ResponseWriter, r *http.Request) {
 	view := view.New(h.tpl, r, sess)
 	view.Set("form", settingsForm)
 	view.Set("themes", model.Themes())
-	view.Set("languages", locale.AvailableLanguages())
+	view.Set("languages", locale.AvailableLanguages)
 	view.Set("timezones", timezones)
 	view.Set("menu", "settings")
 	view.Set("user", loggedUser)

internal/validator/user.go

@@ -155,7 +155,7 @@ func validateTheme(theme string) *locale.LocalizedError {
 }
 
 func validateLanguage(language string) *locale.LocalizedError {
-	languages := locale.AvailableLanguages()
+	languages := locale.AvailableLanguages
 	if _, found := languages[language]; !found {
 		return locale.NewLocalizedError("error.invalid_language")
 	}