gistfile1.txt

'use strict';

var child_process = require('child_process');
var Promise = require('bluebird');

module.exports = Promise.method(function spawn(command, args, cwd) {
    if (!command || !cwd) {
        throw new Error("Both command and working directory must be given, not " + command + " and " + cwd);
    }
    if (args && !args.every(function (arg) {
        var type = typeof arg;
        return type === "boolean" || type === "string" || type === "number";
    })) {
        throw new Error("All arguments must be a boolean, string or number");
    }
 
    return new Promise(function (resolve, reject) {
        var proc = child_process.spawn(command, args, {
            cwd: cwd,
            stdio: 'inherit'
        });
        proc.on("error", reject);
        proc.on("exit", function(code) {
            if (code !== 0) {
                var e = new Error('Non-zero exit code: ' + code);
                e.code = code;
                reject(e);
            } else {
                resolve();
            }
        });
    });
});