build.js

// settings
var FILE_ENCODING = 'utf-8',
    EOL = '\n';
 
// Dependencies
var _cli = require('commander'),
	_uglify = require("uglify-js"), 
    _jshint = require('jshint'),
	_handlebars = require('hbs'), 
    _fs = require('fs');
 
 
// Helper, will generate a CSV if package.json contains multiple licenses
_handlebars.registerHelper('license', function(items){
    items = items.map(function(val){
        return val.type;
    });
    return items.join(', ');
});
 
 
 // Logic 
 // - concatinate all files
concat({
    src : [
		'lib/_start.js',
		'lib/options.js',
		'lib/constructor.js',
		'lib/utils.js',
		'lib/init.js',
		'lib/events.js',
		'lib/ua.js',
		'lib/dialog.js',
		'lib/auth.js',
		'lib/login.js',
		'lib/api.js',
		'lib/dom.js',
		'lib/ui.js',
		'lib/utils-ajax.js',
		'lib/utils-cookies.js',
		'lib/utils-misc.js',
		'lib/utils-promise.js',
		'lib/_end.js'
    ],
    dest : 'build/facebook.lite.js'
});


// - Validate js
lint('build/facebook.lite.js', function(){
    
	// - Create / save minified file
	uglify('build/facebook.lite.js', 'build/facebook.lite-min.js');

});



//
// Methods
function concat(opts) {
    var fileList = opts.src;
    var distPath = opts.dest;
	
	var lib = fileList.map(function(filePath){
            return _fs.readFileSync(filePath, FILE_ENCODING);
        });
	
	var template = _handlebars.compile( lib.join(EOL) );
	 
	//reuse package.json data and add build date
	var data = JSON.parse( _fs.readFileSync('package.json', FILE_ENCODING) );
	data.build_date = (new Date()).toUTCString();
	
	// Save uncompressed file
    _fs.writeFileSync(distPath, template(data), FILE_ENCODING);
    console.log(' '+ distPath +' built.');
	
}


function uglify(srcPath, distPath) {
	/*
    var
      jsp = uglyfyJS.parser,
      pro = uglyfyJS.uglify,
      ast = jsp.parse( _fs.readFileSync(srcPath, FILE_ENCODING) );
 
    ast = pro.ast_mangle(ast);
    ast = pro.ast_squeeze(ast);
 	*/
	
	var result = _uglify.minify(srcPath, { options: { 
		comments : /@license|@preserve/
	} });
	
    _fs.writeFileSync(distPath, result.code, FILE_ENCODING);
    console.log(' '+ distPath +' built.');
}
 
function lint(path, callback) {
    var buf = _fs.readFileSync(path, 'utf-8');
    // remove Byte Order Mark
    buf = buf.replace(/^\uFEFF/, '');
 
    _jshint.JSHINT(buf);
 
    var nErrors = _jshint.JSHINT.errors.length;
 
    if (nErrors) {
		// ruff output of errors (for now)
 		console.log(_jshint.JSHINT.errors);
        console.log(' Found %j lint errors on %s, do you want to continue?', nErrors, path);
		
        _cli.choose(['no', 'yes'], function(i){
            if (i) {
                process.stdin.destroy();
                if(callback) callback();
            } else {
                process.exit(0);
            }
        });
    } else if (callback) {
        callback();
    }
}