get-gulp-args 
get cmd arguments for gulp commands
Install with npm
npm install get-gulp-args
Usage
gulp build --dev --main
var args = require('get-gulp-args')();
process.env.NODE_ENV = args[0] || 'dev';
process.env.PROJECT = args[1] || 'main';
or
gulp build --env dev --project main
var args = require('get-gulp-args')();
process.env.NODE_ENV = args.env || 'dev';
process.env.PROJECT = args.project || 'main';
License
Copyright (c) 2014-2015 Oleg Istomin Released under the MIT license