turn anoymous functions to named function

a.js

(function(){
  $button.click(function(){
    return false;  
  });
})

nameit.js

#!/usr/bin/env node

var fs = require("fs")
var falafel = require("falafel")
var filename = process.argv.slice(2)[0]

fs.readFile(filename, 'utf-8', function(err, content) {
  if (err) {
    console.error(err.stack)
  } else {
    var output = falafel(content, function (node) {
      if (node.type === 'FunctionExpression' && node.id === null) {
        var range = node.body.range
        node.update(node.source().replace("function", "function named_" + range[0] + "_" + range[1]))
      }
    })
    console.log(output)
  }
})