--- /dev/null
+'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
+ }
+}