Gulp version things

gulp.js

function version(prefix) {
    'use strict';

    var stream = require('stream').Transform({objectMode: true}),
        path = require('path');

    stream._transform = function(chunk, enc, next) {
        if (chunk.isNull()) {
            this.push(chunk);
            return next();
        }

        if (!path.extname(chunk.relative).match(/js|css/)) {
            //skip all other file types
            this.push(chunk);
            return next();
        }

        var oldFilename = path.basename(chunk.path);
        var newFilename = prefix + path.basename(chunk.path);
        var alteredPath = chunk.path.replace(oldFilename, newFilename);
        console.log('renaming: ' + chunk.path + ' - to - ' + alteredPath);
        chunk.path = alteredPath;

        this.push(chunk);
        return next();
    };

    return stream;
}