ALR

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/*
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 * ALR - Any Linux Repository
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 * Copyright (C) 2024 Евгений Храмов
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package config
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import (
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	"context"
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	"os"
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	"strings"
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	"sync"
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	"plemya-x.ru/alr/pkg/loggerctx"
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	"golang.org/x/text/language"
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)
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var (
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	langMtx sync.Mutex
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	lang    language.Tag
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	langSet bool
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)
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// Language returns the system language.
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// The first time it's called, it'll detect the langauge based on
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// the $LANG environment variable.
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// Subsequent calls will just return the same value.
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func Language(ctx context.Context) language.Tag {
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	langMtx.Lock()
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	defer langMtx.Unlock()
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	log := loggerctx.From(ctx)
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	if !langSet {
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		syslang := SystemLang()
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		tag, err := language.Parse(syslang)
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		if err != nil {
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			log.Fatal("Error parsing system language").Err(err).Send()
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		}
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		base, _ := tag.Base()
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		lang = language.Make(base.String())
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		langSet = true
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	}
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	return lang
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}
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// SystemLang returns the system language based on
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// the $LANG environment variable.
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func SystemLang() string {
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	lang := os.Getenv("LANG")
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	lang, _, _ = strings.Cut(lang, ".")
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	if lang == "" || lang == "C" {
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		lang = "en"
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	}
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	return lang
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}
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