'use strict';

// requires
var fs = require('fs');
var express = require('express');

// usage message
var usage = 'Usage: node compile.js <infile> <outfile> <port> <directory> [-p]\n' +
            '       <infile>:     input jade file\n' +
            '       <outfile>:    output html file\n' +
            '       <port>:       port to serve <directory>\n' +
            '       <directory>:  directory to serve\n' +
            '       [-p]:         pretty print <outfile>'

// get options
var argv = require('minimist')(process.argv.slice(2));

// check options
if (argv['h']) {
    console.log(usage);
    process.exit(0);
}

// set options
var infile = argv['_'][0] ? argv['_'][0] : 'index.jade';
var outfile = argv['_'][1] ? argv['_'][1] : 'index.html';
var port = process.env.PORT || (argv['_'][2] ? argv['_'][2] : '8000');
var directory = argv['_'][3] ? argv['_'][3] : __dirname;
var pretty = argv['p'] ? true : false;

// compiles jade file
var compile = function () {
  var jade = require('jade');
  var options = {pretty : pretty};
  var html = jade.renderFile(infile, options, null);
  fs.writeFile(outfile, html, function (err) {
    console.log(infile + ' has been compiled to ' + outfile);
  });
}

// watch infile
if (!fs.existsSync(outfile)) compile();
fs.watchFile(infile, compile);

// sart web server
var app = express();
console.log('starting web server on port 8000')
app.use(express.static(directory));
app.listen(port);