// 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/leonelquinteros/gotext
	"github.com/leonelquinteros/gotext"
	// Documentation: https://pkg.go.dev/os
	"os"
)

// Returns the language in the form "ll_CC".
// Alternatives:
// - 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 gotext.SimplifiedLocale(value)
		}
	}
	// The "C" locale is essentially the same as the en-US locale.
	return "en_US"
}

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

	// Specify localedir.
	localizer := gotext.NewLocale("@localedir@", language)
	// Specify domain.
	localizer.AddDomain("hello-go")

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