lilacs/lib/gulp-css-url-prefix/index.js

A web frontend building tool for teamwork, with automaticly compiling, merging, minifying, syncing files to server, supporting distributed servers, ensuring css or html files' inline reference with correct absolute path, and more.

var through = require('through2');
var gutil = require('gulp-util');

// Consts
var PLUGIN_NAME = 'gulp-css-url-prefix';

function gulpCssUrlPrefix(prefix, regexMatch) {

    return through.obj(function(file, enc, cb) {
        if (file.isNull()) {
            this.push(file);
            return cb();
        }

        if (file.isStream()) {
            this.emit('error', new gutil.PluginError(PLUGIN_NAME, 'Streams are not supported!'));
            return cb();
        }

        if (file.isBuffer()) {
            var reg = new RegExp("url[(]['\"]?(" + regexMatch + "[^'\")]*)['\"]?[)]", "g");

            var contents = file.contents.toString('utf8');

            file.contents = new Buffer(
                contents.replace(reg, "url('" + prefix + "$1')")
            );
        }

        cb(null, file);
    });
}

module.exports = gulpCssUrlPrefix;