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37 lines
1.4 KiB
CoffeeScript
37 lines
1.4 KiB
CoffeeScript
ChildProcess = require 'child_process'
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# Spawn a command and invoke the callback when it completes with an error
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# and the output from standard out.
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#
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# * `command` The underlying OS command {String} to execute.
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# * `args` (optional) The {Array} with arguments to be passed to command.
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# * `callback` (optional) The {Function} to call after the command has run. It will be invoked with arguments:
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# * `error` (optional) An {Error} object returned by the command, `null` if no error was thrown.
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# * `code` Error code returned by the command.
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# * `stdout` The {String} output text generated by the command.
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# * `stdout` The {String} output text generated by the command.
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#
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# Returns `undefined`.
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exports.spawn = (command, args, callback) ->
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stdout = ''
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try
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spawnedProcess = ChildProcess.spawn(command, args)
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catch error
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# Spawn can throw an error
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process.nextTick -> callback?(error, stdout)
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return
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spawnedProcess.stdout.on 'data', (data) -> stdout += data
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error = null
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spawnedProcess.on 'error', (processError) -> error ?= processError
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spawnedProcess.on 'close', (code, signal) ->
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error ?= new Error("Command failed: #{signal ? code}") if code isnt 0
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error?.code ?= code
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error?.stdout ?= stdout
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callback?(error, stdout)
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# This is necessary if using Powershell 2 on Windows 7 to get the events to raise
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# http://stackoverflow.com/questions/9155289/calling-powershell-from-nodejs
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spawnedProcess.stdin.end()
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