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module.exports = rimraf
rimraf.sync = rimrafSync
var path = require("path")
, fs
try {
// optional dependency
fs = require("graceful-fs")
} catch (er) {
fs = require("fs")
}
// for EMFILE handling
var timeout = 0
exports.EMFILE_MAX = 1000
exports.BUSYTRIES_MAX = 3
function rimraf (p, cb) {
if (!cb) throw new Error("No callback passed to rimraf()")
var busyTries = 0
rimraf_(p, function CB (er) {
if (er) {
if (er.code === "EBUSY" && busyTries < exports.BUSYTRIES_MAX) {
busyTries ++
var time = busyTries * 100
// try again, with the same exact callback as this one.
return setTimeout(function () {
rimraf_(p, CB)
}, time)
}
// this one won't happen if graceful-fs is used.
if (er.code === "EMFILE" && timeout < exports.EMFILE_MAX) {
return setTimeout(function () {
rimraf_(p, CB)
}, timeout ++)
}
// already gone
if (er.code === "ENOENT") er = null
}
timeout = 0
cb(er)
})
}
// Two possible strategies.
// 1. Assume it's a file. unlink it, then do the dir stuff on EPERM or EISDIR
// 2. Assume it's a directory. readdir, then do the file stuff on ENOTDIR
//
// Both result in an extra syscall when you guess wrong. However, there
// are likely far more normal files in the world than directories. This
// is based on the assumption that a the average number of files per
// directory is >= 1.
//
// If anyone ever complains about this, then I guess the strategy could
// be made configurable somehow. But until then, YAGNI.
function rimraf_ (p, cb) {
fs.unlink(p, function (er) {
if (er && er.code === "ENOENT")
return cb()
if (er && (er.code === "EPERM" || er.code === "EISDIR"))
return rmdir(p, cb)
return cb(er)
})
}
function rmdir (p, cb) {
fs.readdir(p, function (er, files) {
if (er)
return cb(er)
var n = files.length
if (n === 0)
return fs.rmdir(p, cb)
var errState
files.forEach(function (f) {
rimraf(path.join(p, f), function (er) {
if (errState)
return
if (er)
return cb(errState = er)
if (--n === 0)
fs.rmdir(p, cb)
})
})
})
}
// this looks simpler, and is strictly *faster*, but will
// tie up the JavaScript thread and fail on excessively
// deep directory trees.
function rimrafSync (p) {
try {
fs.unlinkSync(p)
} catch (er) {
if (er.code === "ENOENT")
return
if (er.code !== "EPERM" && er.code !== "EISDIR")
throw er
fs.readdirSync(p).forEach(function (f) {
rimrafSync(path.join(p, f))
})
fs.rmdirSync(p)
}
}
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