Initial commit

internal/config/lang.go

@@ -0,0 +1,67 @@
+/*
+ * LURE - Linux User REpository
+ * Copyright (C) 2023 Elara Musayelyan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package config
+
+import (
+	"context"
+	"os"
+	"strings"
+	"sync"
+
+	"lure.sh/lure/pkg/loggerctx"
+	"golang.org/x/text/language"
+)
+
+var (
+	langMtx sync.Mutex
+	lang    language.Tag
+	langSet bool
+)
+
+// Language returns the system language.
+// The first time it's called, it'll detect the langauge based on
+// the $LANG environment variable.
+// Subsequent calls will just return the same value.
+func Language(ctx context.Context) language.Tag {
+	langMtx.Lock()
+	defer langMtx.Unlock()
+	log := loggerctx.From(ctx)
+	if !langSet {
+		syslang := SystemLang()
+		tag, err := language.Parse(syslang)
+		if err != nil {
+			log.Fatal("Error parsing system language").Err(err).Send()
+		}
+		base, _ := tag.Base()
+		lang = language.Make(base.String())
+		langSet = true
+	}
+	return lang
+}
+
+// SystemLang returns the system language based on
+// the $LANG environment variable.
+func SystemLang() string {
+	lang := os.Getenv("LANG")
+	lang, _, _ = strings.Cut(lang, ".")
+	if lang == "" || lang == "C" {
+		lang = "en"
+	}
+	return lang
+}