gistfile1.txt

  local misc = require('/base/util/misc')
  local async = require('async')
  local childProcess = require('childprocess')

  local function execFileToBuffers(command, args, options, callback)
     local child, stdout, stderr, exitCode

     stdout = {}
     stderr = {}
     callback = misc.fireOnce(callback)

     child = childProcess.spawn(command, args, options)
     child.stdout:on('data', function (chunk)
       table.insert(stdout, chunk)
     end)
     child.stderr:on('data', function (chunk)
       table.insert(stderr, chunk)
     end)

     async.parallel({
       function(callback)
         child.stdout:on('end', callback)
       end,
       function(callback)
         child.stderr:on('end', callback)
       end,
       function(callback)
         local onExit

         function onExit(code)
           exitCode = code
           callback()
         end

         child:on('exit', onExit)
       end
     }, function(err)
       callback(err, exitCode, table.concat(stdout, ""), table.concat(stderr, ""))
     end)
   end