gulp-json-angular-translate/index.js

Gulp plugin to convert json files to angular-translate js files

'use strict';
var through = require('through2'),
  gutil = require('gulp-util'),
  jsBeautify = require('js-beautify').js_beautify,
  toSingleQuotes = require('to-single-quotes-shahata'),
  _ = require('lodash');

var PLUGIN_NAME = 'gulp-json-angular-translate';

function unflatten(json) {
  return Object.keys(json).reduce(function (prev, key) {
    return _.merge(prev, key.split('.').reduceRight(function (prev, curr) {
      var obj = {};
      obj[curr] = prev;
      return obj;
    }, json[key]));
  }, {});
}

module.exports = function jsonAngularTranslate(options) {
  var extractLanguage, contentProcessor;

  options = _.extend({
    moduleName: 'translations',
    extractLanguage: /..(?=\.[^.]*$)/,
    hasPreferredLanguage: true,
    createNestedKeys: true
  }, options);

  extractLanguage = typeof(options.extractLanguage) === 'function' ? options.extractLanguage : function (filepath) {
    return filepath.match(options.extractLanguage)[0];
  };

  contentProcessor = options.createNestedKeys ? unflatten : _.identity;

  return through.obj(function doJsonAngularTranslate(file, enc, callback) {
    if (file.isStream()) {
      this.emit('error', new gutil.PluginError(PLUGIN_NAME, 'Streaming not supported!'));
      return callback();
    }

    if (file.isBuffer()) {
      var result = gutil.template('' +
      '\'use strict\';\n' +
      '\n' +
      'try {\n' +
      '  angular.module(\'<%= moduleName %>\');\n' +
      '} catch (e) {\n' +
      '  angular.module(\'<%= moduleName %>\', [\'pascalprecht.translate\']);\n' +
      '}\n' +
      '\n' +
      'angular.module(\'<%= moduleName %>\').config([\'$translateProvider\',\n' +
      '  function ($translateProvider) {\n' +
      '    var translations = <%= translations %>;\n' +
      '    $translateProvider.translations(\'<%= language %>\', translations);\n' +
      '    $translateProvider.translations(translations);\n' +
      (options.hasPreferredLanguage ? '    $translateProvider.preferredLanguage(\'<%= language %>\');\n' : '') +
      '  }\n' +
      ']);', _.extend({}, options, {
        language: extractLanguage(file.path),
        translations: toSingleQuotes(JSON.stringify(contentProcessor(JSON.parse(file.contents.toString())))),
        file: file
      }));

      result = jsBeautify(result, {'indent_size': 2, 'jslint_happy': true});

      file.contents = new Buffer(result);
      file.path = gutil.replaceExtension(file.path, '.js');
      this.push(file);
      callback();
    }
  });
};