Simple name fixer for anime

fixName.js

/*
    Usage: 
      node fixName.js
        --dir           Dir to search, or `pwd`
        --rule          Custom Search RegExp Rule
        --mod           RegExp Modifier, default to i; 
        --replace       What to replace?
        --doRename      Comfirm to rename
*/
var fs   = require ('fs'),
	path = require ('path');

var args = {}, argv = {};
for (var i=2, curFlag; i<process.argv.length; i++) {
	if (!process.argv[i].indexOf ('--')) {
		curFlag = process.argv[i].slice(2);
		args[curFlag] = args[curFlag] || [];
	} else if (curFlag && args[curFlag]) {
		args[curFlag].push (process.argv[i]);
	}
}

// Join args
for (var x in args) {
	if (args.hasOwnProperty(x)) {
		argv[x] = args[x].join(' ');
	}
}

/*
if (!args.rule || !args.replace) {
	console.error ('Argument missing: rule or replace');
	process.exit (1);
}
*/

var regRule  = new RegExp (args.rule || "(\\[[a-z\\-&]+\\])(.+?)(\\[\\d+\\])", args.mod || 'i');
// regRule.global = true;
var replace  = args.replace || '$3$2$1';

console.log ('SnR: ' + regRule.toString () + ' => ' + replace);

var absPath  = path.resolve (args.dir || '.') + '/';
var onlyTest = !args.doRename;

fs.readdirSync (absPath).filter (function (e) {
	return regRule.test (e);
}).forEach (function (e) {
	console.log (e + '\n => ' + e.replace(regRule, replace));
	if (!onlyTest)
		fs.renameSync (absPath + e, absPath + e.replace(regRule, replace));
});