Simple static web server with coffee script

gistfile1.txt

http = require 'http'
fs   = require 'fs'
url  = require 'url'
path = require 'path'
port = process.argv[2] || 8888;

mime =
    ".html": "text/html",
    ".css" : "text/css",
    ".js"  : "application/javascript",
    ".png" : "image/png",
    ".jpg" : "image/jpeg",
    ".gif" : "image/gif",
    ".txt" : "text/plain"

http.createServer((req, res) ->
    uri = url.parse(req.url).pathname
    filename = path.join process.cwd(), uri
    console.log filename

    if fs.existsSync(filename) && fs.statSync(filename).isDirectory()
        filename += '/index.html'

    if fs.existsSync filename
        renderStaticFile req, res, filename
    else
        renderNotFound req, res
).listen port

renderNotFound = (req, res) ->
    res.writeHead 404,
        'Content-Type': 'text/html'
    res.write '404 Not Found\n'
    res.end()

renderStaticFile = (req, res, filename) ->
    ext = path.extname filename
    res.writeHead 200,
        'Content-Type': mime[ext]

    fs.readFile filename, 'binary', (error, file) ->
        res.write(file, 'binary')
        res.end()