fsjs.js

var http = require('http')
, path = require('path')
, fs = require('fs')
, url = require('url')
, dir = path.dirname(require.main.filename)
, requireFile = function(name,callback){
  if (name != require.main.filename) {
    if (require.cache[name]) delete require.cache[name]
    try {
      require(name)
      console.log('Requiring '+name)
    }
    catch (e) {
      if (path.extname(name) === '.js') console.log('Error requiring '+name)
    }
  }
  if (callback) callback()
}
, requireDir = function(callback){
  fs.readdir(dir,function(e,files){
    if (!e) files.forEach(function(filename,filenumber){
      requireFile(path.resolve(dir,filename),function(){
        if (filenumber === files.length-1) callback()
      })
    })
  })
}
, watchDir = function(callback){
  fs.watch(dir,function(event,filename){
    requireFile(path.resolve(dir,filename))
  })
}
module.exports = function(port){
  var args = Array.prototype.slice.call(arguments)
  watchDir(function(){
    requireDir(function(){
      http.createServer(function(req,res){
        var urlparts = url.parse(req.url).pathname.split('/').slice(1)
        , method = req.method.toLowerCase()
        , defaultCallback = function(data){
          if (typeof data === 'string') res.write(data)
          else {
            res.writeHead(200,{'Content-Type':'application/json'})
            res.write(JSON.stringify(data))
          }
          res.end()
        }
        if (typeof args[args.length-1]==='function') callback = function(data){
          args[args.length-1](data,defaultCallback)
        }
        else callback = defaultCallback
        if (urlparts[urlparts.length-1]==='') urlparts.pop()
        args.slice(1).forEach(function(arg){
          if (!urlparts.length) return
          if (require.cache[path.resolve(dir,urlparts[0]+'.js')]) return
          if (typeof arg !== 'string') return
          this[arg] = urlparts.shift()
        })
        this.request = req
        this.response = res
        var modu = require.cache[path.resolve(dir,urlparts[0]+'.js')]
        if (modu && modu.exports[method]) {
          modu.exports[method].apply(this,urlparts.slice(1).concat([callback]))
        }
        else if (require.main.exports[method]) {
          require.main.exports[method].apply(this,urlparts.concat([callback]))
        }
        else callback('oops')
      })
    }).listen(port)
  })
}