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'use strict'
var fs = require('graceful-fs')
var chain = require('slide').chain
var MurmurHash3 = require('imurmurhash')

function murmurhex () {
  var hash = new MurmurHash3()
  for (var ii = 0; ii < arguments.length; ++ii) hash.hash('' + arguments[ii])
  return hash.result()
}
var invocations = 0
var getTmpname = function (filename) {
  return filename + '.' + murmurhex(__filename, process.pid, ++invocations)
}

module.exports = function writeFile (filename, data, options, callback) {
  if (options instanceof Function) {
    callback = options
    options = null
  }
  if (!options) options = {}
  var tmpfile = getTmpname(filename)
  chain([
    [fs, fs.writeFile, tmpfile, data, options],
    options.chown && [fs, fs.chown, tmpfile, options.chown.uid, options.chown.gid],
    [fs, fs.rename, tmpfile, filename]
  ], function (err) {
    err ? fs.unlink(tmpfile, function () { callback(err) })
      : callback()
  })
}

module.exports.sync = function writeFileSync (filename, data, options) {
  if (!options) options = {}
  var tmpfile = getTmpname(filename)
  try {
    fs.writeFileSync(tmpfile, data, options)
    if (options.chown) fs.chownSync(tmpfile, options.chown.uid, options.chown.gid)
    fs.renameSync(tmpfile, filename)
  } catch (err) {
    try { fs.unlinkSync(tmpfile) } catch (e) {}
    throw err
  }
}