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website/node_modules/npm/lib/utils/spawn.js

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+module.exports = spawn
+
+var _spawn = require('child_process').spawn
+var EventEmitter = require('events').EventEmitter
+var npwr = require('./no-progress-while-running.js')
+
+function willCmdOutput (stdio) {
+  if (stdio === 'inherit') return true
+  if (!Array.isArray(stdio)) return false
+  for (var fh = 1; fh <= 2; ++fh) {
+    if (stdio[fh] === 'inherit') return true
+    if (stdio[fh] === 1 || stdio[fh] === 2) return true
+  }
+  return false
+}
+
+function spawn (cmd, args, options) {
+  var cmdWillOutput = willCmdOutput(options && options.stdio)
+
+  if (cmdWillOutput) npwr.startRunning()
+  var raw = _spawn(cmd, args, options)
+  var cooked = new EventEmitter()
+
+  raw.on('error', function (er) {
+    if (cmdWillOutput) npwr.stopRunning()
+    er.file = cmd
+    cooked.emit('error', er)
+  }).on('close', function (code, signal) {
+    if (cmdWillOutput) npwr.stopRunning()
+    // Create ENOENT error because Node.js v0.8 will not emit
+    // an `error` event if the command could not be found.
+    if (code === 127) {
+      var er = new Error('spawn ENOENT')
+      er.code = 'ENOENT'
+      er.errno = 'ENOENT'
+      er.syscall = 'spawn'
+      er.file = cmd
+      cooked.emit('error', er)
+    } else {
+      cooked.emit('close', code, signal)
+    }
+  })
+
+  cooked.stdin = raw.stdin
+  cooked.stdout = raw.stdout
+  cooked.stderr = raw.stderr
+  cooked.kill = function (sig) { return raw.kill(sig) }
+
+  return cooked
+}