// Example for use of GNU gettext.
// This file is in the public domain.

// Source code of a Go program showing the use of a multi-locale API.


package main

import (
	// Documentation: https://pkg.go.dev/fmt
	"fmt"
	// Documentation: https://pkg.go.dev/github.com/snapcore/go-gettext
	"github.com/snapcore/go-gettext"
	// Documentation: https://pkg.go.dev/os
	"os"
)

// Alternatives:
// - gettext.getUserLanguages()
// - https://pkg.go.dev/github.com/Xuanwo/go-locale
// - https://pkg.go.dev/github.com/jeandeaual/go-locale
func getUserLanguage() string {
	// Look at the POSIX environment variables.
	for _, variable := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
		if value := os.Getenv(variable); value != "" {
			return value
		}
	}
	// The "C" locale is essentially the same as the en-US locale.
	return "en-US"
}

func main () {
	// Specify locale.
	locale := getUserLanguage()

	// Specify domain, localedir.
	domain := &gettext.TextDomain{
		Name: "hello-go",
		LocaleDir: "@localedir@",
	}
	gettext := domain.Locale(locale)

	fmt.Println(gettext.Gettext("Hello, world!"))
	fmt.Println(fmt.Sprintf(gettext.Gettext("This program is running as process number %d."),
	                        os.Getpid()))
}