gulpfile.js

var gulp      = require('gulp'),
    fs        = require('fs'),
    rename    = require('gulp-rename'),
    del       = require('del'),
    swig      = require('gulp-swig'),
    data      = require('gulp-data')
    jsonlint  = require('gulp-jsonlint');
    
var translations = JSON.parse(fs.readFileSync('_trans/_config.json')),
    rtl = ['fa', 'ar'],
    sites,
    trans,
    notes;

gulp.task('jsonlint', function() {
    gulp.src('sites.json')
        .pipe(jsonlint())
        .pipe(jsonlint.reporter());
});
    
gulp.task('clean', function(callback) {
    return del(['site/*.html'], callback);
});

gulp.task('translate', ['clean'], function() {
    
    translations.forEach(function(translation) {
        
        sites = JSON.parse(fs.readFileSync('sites.json'));
        trans = JSON.parse(fs.readFileSync('_trans/' + translation.code + '.json'));
        
        if (translation.code !== 'en') {
            sites.forEach(function(site, i) {
                if (site.notes) {
                    site.notes = site['notes_'+translation.code] ? site['notes_'+translation.code] : site.notes;
                    sites[i] = site;
                }
            });
        }
        
        gulp.src('template.html')
            .pipe(rename((translation.code == 'en' ? 'index' : translation.code) + '.html'))
            .pipe(data({
                trans: translation,
                i18n: trans,
                sites: sites,
                rtl: (rtl.indexOf(translation.code) == -1) ? false : true,
                assetPath: 'assets'
            }))
            .pipe(swig())
            .pipe(gulp.dest('site'));
    });
  
});

gulp.task('default', ['jsonlint', 'translate']);