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136 lines
3.5 KiB
Markdown
136 lines
3.5 KiB
Markdown
# i18n [](https://godoc.org/github.com/unknwon/i18n)
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Package i18n is for app Internationalization and Localization.
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## Introduction
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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.
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You can use following command to install this module:
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go get github.com/Unknwon/i18n
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## Usage
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First of all, you have to import this package:
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```go
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import "github.com/unknwon/i18n"
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```
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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, suppose there are two files called `locale_en-US.ini` and `locale_zh-CN.ini`.
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The name and extensions of locale files can be anything, but we strongly recommend you to follow the style of gogsweb.
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## Minimal example
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Here are two simplest locale file examples:
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File `locale_en-US.ini`:
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```ini
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hi = hello, %s
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bye = goodbye
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```
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File `locale_zh-CN.ini`:
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```ini
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hi = 您好，%s
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bye = 再见
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```
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### Do Translation
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There are two ways to do translation depends on which way is the best fit for your application or framework.
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Directly use package function to translate:
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```go
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i18n.Tr("en-US", "hi", "Unknwon")
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i18n.Tr("en-US", "bye")
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```
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Or create a struct and embed it:
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```go
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type MyController struct{
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// ...other fields
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i18n.Locale
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}
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//...
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func ... {
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c := &MyController{
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Locale: i18n.Locale{"en-US"},
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}
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_ = c.Tr("hi", "Unknwon")
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_ = c.Tr("bye")
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}
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```
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Code above will produce correspondingly:
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- English `en-US`：`hello, Unknwon`, `goodbye`
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- Chinese `zh-CN`：`您好，Unknwon`, `再见`
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## Section
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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.
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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:
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Content in locale file:
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```ini
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about = About
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[about]
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about = About Us
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```
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Get `about` in home page:
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```go
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i18n.Tr("en-US", "about")
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```
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Get `about` in about page:
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```go
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i18n.Tr("en-US", "about.about")
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```
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### Ambiguity
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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.
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For example, the key name is `about.`, then we can use:
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```go
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i18n.Tr("en-US", ".about.")
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```
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to get expect result.
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## Helper tool
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Module i18n provides a command line helper tool beei18n for simplify steps of your development. You can install it as follows:
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go get github.com/unknwon/i18n/ui18n
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### Sync locale files
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Command `sync` allows you use a exist local file as the template to create or sync other locale files:
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ui18n sync srouce_file.ini other1.ini other2.ini
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This command can operate 1 or more files in one command.
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## More information
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- The first locale you load to the module is considered as **default locale**.
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- When matching non-default locale and didn't find the string, i18n will have a second try on default locale.
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- If i18n still cannot find string in the default locale, raw string will be returned. For instance, when the string is `hi` and it does not exist in locale file, simply return `hi` as output.
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