rapido/lib/util/spawn.js

Rápido is an extensible command line interface that enables rapid development for any technology stack. Rápido is written in JavaScript and is built on top of Node.js and npm.

var spawn = require('child_process').spawn;
var split = require('split');
var raptorPromises = require('raptor-promises');

module.exports = function(cmd, args, options) {
    var rapido = require('../').instance;
    options = options || {};
    var logger = options.logger || rapido.log;
    var captureOutput = options.captureOutput === true;

    return require('./project-manager').load()
        .then(function(projectInfo) {
            var deferred = raptorPromises.defer();

            options.cwd = options.cwd || projectInfo.rootDir.getAbsolutePath();
            options.stdio = 'inherit';

            var command = cmd + ' ' + args.join(' ');

            if (options.cwd && typeof options.cwd !== 'string') {
                options.cwd = options.cwd.toString();
            }
            
            if (options.cwd !== projectInfo.rootDir.getAbsolutePath()) {
                logger.info(cmd, 'Executing "' + command + '" (cwd: ' + options.cwd + ')...');
            }
            else {
                logger.info(cmd, 'Executing "' + command + '"...');    
            }

            var stderr = '';
            var stdout = '';
            
            var p = spawn(cmd, args, options);

            p.stdout
                .pipe(split())
                .on('data', function (data) {
                    if (captureOutput) {
                        stdout += data + '\n';
                    }

                    data = data.toString().trim();
                    if (!data) {
                        return;
                    }
                    rapido.log.info(cmd, data);
                });

            p.stderr
                .pipe(split())
                .on('data', function (data) {
                    if (captureOutput) {
                        stderr += data + '\n';
                    }

                    data = data.toString().trim();
                    if (!data) {
                        return;
                    }

                    rapido.log.info(cmd, data.toString().trim());
                });

            p.on('close', function (code) {
                if (code !== 0) {
                    logger.error(cmd, '"' + command + '" exited with error code ' + code);

                    var e = new Error('"' + command + '" failed with code ' + code);
                    if (captureOutput) {
                        e.stderr = stderr;
                        e.stdout = stdout;
                    }

                    deferred.reject(e);
                }
                else {
                    logger.info(cmd, '"' + command + '" completed successfully');
                    deferred.resolve(captureOutput ? stdout : null);
                }
            });

            return deferred.promise;
        });
};