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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
}
}