go-i18n - Internationalization for Go

Getting started

If you want to use go-i18n in your project, you first have to make one or more translation maps. There are several formats supported.

JSON

All .json and .js files loaded with the NewTemplateFile loader are interpreted as a flat list of key-value pairs. Nested items are allowed and will be concatenated with a dot.

For example:

{
  "foo": {
    "bar": {
      "testing"
    }
  }
}

Here, foo → bar is accessible as foo.bar translation key.

YAML

All .yml and .yaml files loaded with the NewTemplateFile loader are interpreted as Rails Application compatible language files, see the Rails Internationalization page for more details.

Basic project structure

A basic project structure may look like follows:

package app

import (
    "git.maze.io/maze/go-i18n"

    "golang.org/net/http"
    "golang.org/x/text/language"
)

func main() {
    var lang = i18n.New(language.English)

    lang.Add(i18n.NewMap(language.English, map[string]string{
        "hello %s": "Hello %s!",
    }))

    lang.Add(i18n.NewMap(language.Dutch, map[string]string{
        "hello %s": "Hallo %s!",
    }))

    lang.Add(i18n.NewMap(language.SimplifiedChinese, map[string]string{
        "hello %s": "%s 你好！",
    }))
        
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        t := lang.Accept(r.Header().Get("Accept-Language"))
        t.Fprintf(w, "hello %s", r.RemoteAddr)
    })
    http.ListenAndServe(":8000", nil)
}

Integration

You can use i18n with many web frameworks, some of which are documented below.

Beego integration

Add these three lines before "beego.Run()" in your main() function.

for k, fn := range lang.TemplateFuncs() {
    beego.AddFuncMap(k, fn)
}

Revel integration

package app

import (
    "git.maze.io/maze/go-i18n"
    "github.com/revel/revel"
    "golang.org/x/text/language"
)

var lang *i18n.I18N

func init() {
    var err error
    if lang, err = i18n.New(language.English); err != nil {
        panic(err)
    }

    lang.TemplateInject(revel.TemplateFuncs)
}

Pongo2 integration

package app

import (
    "git.maze.io/maze/go-i18n"
    "github.com/flosch/pongo2"
    "golang.org/x/text/language"
)

var lang *i18n.I18N

func init() {
    var err error
    if lang, err = i18n.New(language.English); err != nil {
        panic(err)
    }

    pongo2.RegisterFilter("translate",
        func(in *pongo2.Value, param *pongo2.Value) (out *pongo2.Value, err *pongo2.Error) {
            if param != nil {
                return pongo2.AsValue(lang.Translate(param.String(), in.String())), nil
            }
            return pongo2.AsValue(lang.Translate(lang.Default().String(), in.String())), nil
        },
    )
}