feat: i18n with default lang zh-Hans (translating)

i18n/i18n.go

@@ -0,0 +1,60 @@
+package i18n
+
+import (
+	"embed"
+
+	"maps"
+
+	"github.com/krau/SaveAny-Bot/common"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"github.com/pelletier/go-toml/v2"
+	"golang.org/x/text/language"
+)
+
+//go:embed locale/*.toml
+var localesFS embed.FS
+
+var (
+	bundle    *i18n.Bundle
+	localizer *i18n.Localizer
+)
+
+func Init(lang string) {
+	bundle = i18n.NewBundle(language.SimplifiedChinese)
+	bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
+	files, err := localesFS.ReadDir("locale")
+	if err != nil {
+		panic("failed to read locale directory: " + err.Error())
+	}
+	for _, file := range files {
+		if _, err := bundle.LoadMessageFileFS(localesFS, "locale/"+file.Name()); err != nil {
+			panic("failed to load message file: " + err.Error())
+		}
+	}
+	if lang == "" {
+		lang = "zh-Hans"
+	}
+	localizer = i18n.NewLocalizer(bundle, lang)
+	if localizer == nil {
+		panic("failed to create localizer, check your config for valid language setting")
+	}
+}
+
+func T(key string, templateData ...map[string]any) string {
+	if localizer == nil || bundle == nil {
+		panic("localizer or bundle is not initialized, call Init() first")
+	}
+	templateDataMap := make(map[string]any)
+	for _, data := range templateData {
+		maps.Copy(templateDataMap, data)
+	}
+	msg, err := localizer.Localize(&i18n.LocalizeConfig{
+		MessageID:    key,
+		TemplateData: templateDataMap,
+	})
+	if err != nil {
+		common.Log.Errorf("failed to localize message for key '%s': %v", key, err)
+		return key
+	}
+	return msg
+}