135 lines
3.3 KiB
Markdown
135 lines
3.3 KiB
Markdown
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.
|