fetch_modules

#!/usr/bin/env node
var fs = require('fs')
var http = require('http')
var path = require('path')
var url = require('url')
var es = require('esprima')
var estraverse = require('estraverse')
var mkdirp = require('mkdirp')

var base = process.argv[2]

function readFile(base) {

  try {
    var code = fs.readFileSync(base).toString()

    estraverse.traverse(es.parse(code), {
      enter: function (node, parent) {
        if (node.type == 'VariableDeclarator' && node.init.callee.name == 'require') {

          var p = node.init.arguments[0].value
          var match = p.indexOf(':') > -1

          if (match) {

            var origin = url.parse(p)
            var fullpath = path.join(__dirname, '/node_modules', origin.hostname, origin.pathname)
            var dirname = path.dirname(fullpath)
            var filename = path.basename(fullpath)

            mkdirp.sync(dirname)

            var writestream = fs.createWriteStream(fullpath)

            var req = http.request(url.parse(p), function(res) {
              res.setEncoding('utf8')
              res.pipe(writestream)
            })

            req.on('error', function(e) {
              console.log('problem getting module: ' + e.message);
            })

            req.end()

          }
          else {
            readFile(path.resolve(p) + '.js')
          }
        } 
      }
    })

  } catch($) { return }
}

readFile(base)