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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
}