locales/README.md

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koa-locales
=======
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[download-url]: https://npmjs.org/package/koa-locales
koa locales, i18n solution for koa:
1. All locales resources location on `options.dir`.
2. resources file supports: `*.js`, `*.json` and `*.properties`, [examples](test/locales/)
3. One api: `__(key[, value, ...])`
4. Auto detect request locale from `query`, `cookie` and `header: Accept-Language`
## Installation
```bash
$ npm install koa-locales --save
```
## Quick start
```js
var koa = require('koa');
var locales = require('koa-locales');
var app = koa();
var options = {
dirs: [__dirname + '/locales', __dirname + '/foo/locales'],
};
locales(app, options);
```
## API Reference
### `locales(app, options)`
Patch locales functions to koa app.
- {Application} app: koa app instance.
- {Object} options: optional params
- {String} functionName: locale function name patch on koa context. Optional, default is `__`.
- {String} dirs: locales resources store directories. Optional, default is `['$PWD/locales']`.
- {String} defaultLocale: default locale. Optional, default is `en-US`.
- {String} queryField: locale field name on query. Optional, default is `locale`.
- {String} cookieField: locale field name on cookie. Optional, default is `locale`.
- {String|Number} cookieMaxAge: set locale cookie value max age. Optional, default is `1y`, expired after one year.
```js
locales({
app: app,
dirs: [__dirname + '/app/locales'],
defaultLocale: 'zh-CN',
}));
```
### `context.__(key[, value1[, value2, ...]])`
Get current request locale text.
```js
function* home() {
this.body = {
message: this.__('Hello, %s', 'fengmk2'),
};
}
```
Examples:
```js
__('Hello, %s. %s', 'fengmk2', 'koa rock!')
=>
'Hello fengmk2. koa rock!'
__('{0} {0} {1} {1} {1}', ['foo', 'bar'])
=>
'foo foo bar bar bar'
__('{a} {a} {b} {b} {b}', {a: 'foo', b: 'bar'})
=>
'foo foo bar bar bar'
```
## Usage on template
```js
this.state.__ = this.__.bind(this);
```
[nunjucks] example:
```html
{{ __('Hello, %s', user.name) }}
```
## License
[MIT](LICENSE)
[nunjucks]: https://www.npmjs.com/package/nunjucks