TOTVSTEC/cloudbridge-cli

'use strict';

var Q = require('q'),
    child_process = require('child_process');

module.exports = function spawn(command, args, options) {
    var deferred = Q.defer();
    var child = child_process.spawn(command, args, options);
    var capturedOut = '';
    var capturedErr = '';

    if (child.stdout) {
        child.stdout.on('data', function(data) {
            capturedOut += data;
            deferred.notify({ 'stdout': data });
        });
    }

    if (child.stderr) {
        child.stderr.on('data', function(data) {
            capturedErr += data;
            deferred.notify({ 'stderr': data });
        });
    }

    child.on('close', whenDone);
    child.on('error', whenDone);

    function whenDone(arg) {
        child.removeListener('close', whenDone);
        child.removeListener('error', whenDone);

        var code = typeof arg == 'number' ? arg : arg && arg.code;

        if (code === 0) {
            deferred.resolve(capturedOut.trim());
        }
        else {
            var errMsg = command + ': Command failed with exit code ' + code;
            if (capturedErr) {
                errMsg += ' Error output:\n' + capturedErr.trim();
            }
            var err = new Error(errMsg);
            err.code = code;
            err.stdout = capturedOut;
            err.stderr = capturedErr;

            deferred.reject(err);
        }
    }

    return deferred.promise;
};