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i18n
====
Package i18n is for app Internationalization and Localization.
## Introduction
This package provides multiple-language options to improve user experience. Sites like [Go Walker](http://gowalker.org) and [gogs.io](http://gogs.io) are using this module to implement Chinese and English user interfaces.
You can use following command to install this module:
go get github.com/Unknwon/i18n
## Usage
First of all, you have to import this package:
```go
import "github.com/Unknwon/i18n"
```
The format of locale files is very like INI format configuration file, which is basically key-value pairs. But this module has some improvements. Every language corresponding to a locale file, for example, under `conf/locale` folder of [gogsweb](https://github.com/gogits/gogsweb/tree/master/conf/locale), there are two files called `locale_en-US.ini` and `locale_zh-CN.ini`.
The name and extensions of locale files can be anything, but we strongly recommend you to follow the style of gogsweb.
## Minimal example
Here are two simplest locale file examples:
File `locale_en-US.ini`:
```ini
hi = hello, %s
bye = goodbye
```
File `locale_zh-CN.ini`:
```ini
hi = 您好,%s
bye = 再见
```
### Do Translation
There are two ways to do translation depends on which way is the best fit for your application or framework.
Directly use package function to translate:
```go
i18n.Tr("en-US", "hi", "Unknwon")
i18n.Tr("en-US", "bye")
```
Or create a struct and embed it:
```go
type MyController struct{
// ...other fields
i18n.Locale
}
//...
func ... {
c := &MyController{
Locale: i18n.Locale{"en-US"},
}
_ = c.Tr("hi", "Unknwon")
_ = c.Tr("bye")
}
```
Code above will produce correspondingly:
- English `en-US``hello, Unknwon`, `goodbye`
- Chinese `zh-CN``您好Unknwon`, `再见`
## Section
For different pages, one key may map to different values. Therefore, i18n module also uses the section feature of INI format configuration to achieve section.
For example, the key name is `about`, and we want to show `About` in the home page and `About Us` in about page. Then you can do following:
Content in locale file:
```ini
about = About
[about]
about = About Us
```
Get `about` in home page:
```go
i18n.Tr("en-US", "about")
```
Get `about` in about page:
```go
i18n.Tr("en-US", "about.about")
```
### Ambiguity
Because dot `.` is sign of section in both [INI parser](https://github.com/go-ini/ini) and locale files, so when your key name contains `.` will cause ambiguity. At this point, you just need to add one more `.` in front of the key.
For example, the key name is `about.`, then we can use:
```go
i18n.Tr("en-US", ".about.")
```
to get expect result.
## Helper tool
Module i18n provides a command line helper tool beei18n for simplify steps of your development. You can install it as follows:
go get github.com/Unknwon/i18n/ui18n
### Sync locale files
Command `sync` allows you use a exist local file as the template to create or sync other locale files:
ui18n sync srouce_file.ini other1.ini other2.ini
This command can operate 1 or more files in one command.
## More information
If the key does not exist, then i18n will return the key string to caller. For instance, when key name is `hi` and it does not exist in locale file, simply return `hi` as output.

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// Copyright 2013 Unknwon
//
// Licensed under the Apache License, Version 2.0 (the "License"): you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations
// under the License.
// Package i18n is for app Internationalization and Localization.
package i18n
import (
"errors"
"fmt"
"reflect"
"strings"
"gopkg.in/ini.v1"
)
var (
ErrLangAlreadyExist = errors.New("Lang already exists")
locales = &localeStore{store: make(map[string]*locale)}
)
type locale struct {
id int
lang string
langDesc string
message *ini.File
}
type localeStore struct {
langs []string
langDescs []string
store map[string]*locale
defaultLang string
}
// Get target language string
func (d *localeStore) Get(lang, section, format string) (string, bool) {
if locale, ok := d.store[lang]; ok {
if key, err := locale.message.Section(section).GetKey(format); err == nil {
return key.Value(), true
}
}
if len(d.defaultLang) > 0 && lang != d.defaultLang {
return d.Get(d.defaultLang, section, format)
}
return "", false
}
func (d *localeStore) Add(lc *locale) bool {
if _, ok := d.store[lc.lang]; ok {
return false
}
lc.id = len(d.langs)
d.langs = append(d.langs, lc.lang)
d.langDescs = append(d.langDescs, lc.langDesc)
d.store[lc.lang] = lc
return true
}
func (d *localeStore) Reload(langs ...string) (err error) {
if len(langs) == 0 {
for _, lc := range d.store {
if err = lc.message.Reload(); err != nil {
return err
}
}
} else {
for _, lang := range langs {
if lc, ok := d.store[lang]; ok {
if err = lc.message.Reload(); err != nil {
return err
}
}
}
}
return nil
}
// SetDefaultLang sets default language which is a indicator that
// when target language is not found, try find in default language again.
func SetDefaultLang(lang string) {
locales.defaultLang = lang
}
// ReloadLangs reloads locale files.
func ReloadLangs(langs ...string) error {
return locales.Reload(langs...)
}
// Count returns number of languages that are registered.
func Count() int {
return len(locales.langs)
}
// ListLangs returns list of all locale languages.
func ListLangs() []string {
langs := make([]string, len(locales.langs))
copy(langs, locales.langs)
return langs
}
func ListLangDescs() []string {
langDescs := make([]string, len(locales.langDescs))
copy(langDescs, locales.langDescs)
return langDescs
}
// IsExist returns true if given language locale exists.
func IsExist(lang string) bool {
_, ok := locales.store[lang]
return ok
}
// IndexLang returns index of language locale,
// it returns -1 if locale not exists.
func IndexLang(lang string) int {
if lc, ok := locales.store[lang]; ok {
return lc.id
}
return -1
}
// GetLangByIndex return language by given index.
func GetLangByIndex(index int) string {
if index < 0 || index >= len(locales.langs) {
return ""
}
return locales.langs[index]
}
func GetDescriptionByIndex(index int) string {
if index < 0 || index >= len(locales.langDescs) {
return ""
}
return locales.langDescs[index]
}
func GetDescriptionByLang(lang string) string {
return GetDescriptionByIndex(IndexLang(lang))
}
func SetMessageWithDesc(lang, langDesc string, localeFile interface{}, otherLocaleFiles ...interface{}) error {
message, err := ini.Load(localeFile, otherLocaleFiles...)
if err == nil {
message.BlockMode = false
lc := new(locale)
lc.lang = lang
lc.langDesc = langDesc
lc.message = message
if locales.Add(lc) == false {
return ErrLangAlreadyExist
}
}
return err
}
// SetMessage sets the message file for localization.
func SetMessage(lang string, localeFile interface{}, otherLocaleFiles ...interface{}) error {
return SetMessageWithDesc(lang, lang, localeFile, otherLocaleFiles...)
}
// Locale represents the information of localization.
type Locale struct {
Lang string
}
// Tr translates content to target language.
func (l Locale) Tr(format string, args ...interface{}) string {
return Tr(l.Lang, format, args...)
}
// Index returns lang index of LangStore.
func (l Locale) Index() int {
return IndexLang(l.Lang)
}
// Tr translates content to target language.
func Tr(lang, format string, args ...interface{}) string {
var section string
parts := strings.SplitN(format, ".", 2)
if len(parts) == 2 {
section = parts[0]
format = parts[1]
}
value, ok := locales.Get(lang, section, format)
if ok {
format = value
}
if len(args) > 0 {
params := make([]interface{}, 0, len(args))
for _, arg := range args {
if arg != nil {
val := reflect.ValueOf(arg)
if val.Kind() == reflect.Slice {
for i := 0; i < val.Len(); i++ {
params = append(params, val.Index(i).Interface())
}
} else {
params = append(params, arg)
}
}
}
return fmt.Sprintf(format, params...)
}
return format
}