git ssb

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var Polyglot = require('node-polyglot')
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var path = require('path')
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var fs = require('fs')
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var asyncMemo = require('asyncmemo')
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module.exports = function (localesDir, fallback) {
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  return new I18n(localesDir, fallback)
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}
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function I18n(dir, fallback) {
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  this.dir = dir
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  this.fallback = fallback
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}
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I18n.prototype = {
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  constructor: I18n,
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  getCatalog: asyncMemo(function (locale, cb) {
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    var self = this
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    if (!locale) return cb.call(self)
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    var filename = path.join(this.dir, locale.replace(/\//g, '') + '.json')
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    fs.access(filename, fs.R_OK, function (err) {
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      if (err) return cb.call(self)
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      fs.readFile(filename, onRead)
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    })
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    function onRead(err, data) {
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      if (err) return cb.call(self, err)
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      var phrases
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      try { phrases = JSON.parse(data) }
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      catch(e) { return cb.call(self, e) }
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      var polyglot = new Polyglot({locale: locale, phrases: phrases})
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      var t = polyglot.t.bind(polyglot)
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      t.locale = polyglot.currentLocale
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      cb.call(self, null, t)
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    }
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  }),
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  pickCatalog: function (acceptLocales, locale, cb) {
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    this.getCatalog(locale, function (err, phrases) {
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      if (err || phrases) return cb(err, phrases)
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      var locales = String(acceptLocales).split(/, */).map(function (item) {
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        return item.split(';')[0]
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      })
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      this.pickCatalog2(locales.concat(
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        process.env.LANG && process.env.LANG.replace(/[._].*/, ''),
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        this.fallback
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      ).reverse(), cb)
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    })
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  },
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  pickCatalog2: function (locales, cb) {
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    if (!locales.length) return cb(null, new Error('No locale'))
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    this.getCatalog(locales.pop(), function (err, phrases) {
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      if (err || phrases) return cb(err, phrases)
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      this.pickCatalog2(locales, cb)
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    })
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  },
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  listLocales: function (cb) {
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    fs.readdir(dir, function (err, files) {
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      if (err) return cb(err)
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      cb(null, files.map(function (filename) {
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        return filename.replace(/\.json$/, '')
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      }))
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    })
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  }
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}
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