Add n_m

node_modules/pump/index.js

@@ -0,0 +1,82 @@
+var once = require('once')
+var eos = require('end-of-stream')
+var fs = require('fs') // we only need fs to get the ReadStream and WriteStream prototypes
+
+var noop = function () {}
+var ancient = /^v?\.0/.test(process.version)
+
+var isFn = function (fn) {
+  return typeof fn === 'function'
+}
+
+var isFS = function (stream) {
+  if (!ancient) return false // newer node version do not need to care about fs is a special way
+  if (!fs) return false // browser
+  return (stream instanceof (fs.ReadStream || noop) || stream instanceof (fs.WriteStream || noop)) && isFn(stream.close)
+}
+
+var isRequest = function (stream) {
+  return stream.setHeader && isFn(stream.abort)
+}
+
+var destroyer = function (stream, reading, writing, callback) {
+  callback = once(callback)
+
+  var closed = false
+  stream.on('close', function () {
+    closed = true
+  })
+
+  eos(stream, {readable: reading, writable: writing}, function (err) {
+    if (err) return callback(err)
+    closed = true
+    callback()
+  })
+
+  var destroyed = false
+  return function (err) {
+    if (closed) return
+    if (destroyed) return
+    destroyed = true
+
+    if (isFS(stream)) return stream.close(noop) // use close for fs streams to avoid fd leaks
+    if (isRequest(stream)) return stream.abort() // request.destroy just do .end - .abort is what we want
+
+    if (isFn(stream.destroy)) return stream.destroy()
+
+    callback(err || new Error('stream was destroyed'))
+  }
+}
+
+var call = function (fn) {
+  fn()
+}
+
+var pipe = function (from, to) {
+  return from.pipe(to)
+}
+
+var pump = function () {
+  var streams = Array.prototype.slice.call(arguments)
+  var callback = isFn(streams[streams.length - 1] || noop) && streams.pop() || noop
+
+  if (Array.isArray(streams[0])) streams = streams[0]
+  if (streams.length < 2) throw new Error('pump requires two streams per minimum')
+
+  var error
+  var destroys = streams.map(function (stream, i) {
+    var reading = i < streams.length - 1
+    var writing = i > 0
+    return destroyer(stream, reading, writing, function (err) {
+      if (!error) error = err
+      if (err) destroys.forEach(call)
+      if (reading) return
+      destroys.forEach(call)
+      callback(error)
+    })
+  })
+
+  return streams.reduce(pipe)
+}
+
+module.exports = pump