lib/runner.js

const async  = require('async');

const child  = require('child_process');

const colors = require('colors');

const fs     = require('fs');

const mkdirp = require('mkdirp');

const p      = require('path');

const util   = require('util');

/**

 * Execute a single command.

 *

 * @param {Object} command: the command to execute

 * @param {Object} opts:

 *   - cwd: base directory where the commands should be executed from

 *   - quiet: don't display command output if quiet

 *   - task: Bob task name, used to create output directory

 *   - type: Bob task type name, used to create output directory

 *   - dir: report directory where process output will be written into a file

 * @param {Function} cb: standard cb(err, result) callback

 */

function exec(command, opts, cb) {

  console.log('%s | %s', command.meta.task.cyan, command.exec);

  var logFile = p.join(opts.logDir, util.format('%s.log', command.meta.type));

  var cproc   = child.exec(command.exec, opts, cb);

  var wstream = fs.createWriteStream(logFile);

  cproc.stdout.on('data', function (data) {

    if (!opts.quiet) {

      process.stdout.write(data);

    }

    wstream.write(data);

  });

  cproc.stderr.on('data', function (data) {

    if (!opts.quiet) {

      process.stderr.write(data);

    }

    wstream.write(data);

  });

}

/**

 * Execute multiple commands in series.

 *

 * @param {Array} commands: an array of commands, each command contains:

 *   - exec: executable shell command line

 *   - meta: command metadata, language and type

 * @param {Object} opts:

 *   - logDir: directory where log files will be written to

 *   - quiet: don't display command output if quiet is set

 * @param {Function} cb: standard cb(err, result) callback

 */

function execSeries(commands, opts, cb) {

  function _exec(command, cb) {

    opts.logDir = opts.logDir.replace(/\{lang\}/g, command.meta.language);

    mkdirp(opts.logDir, function (err) {

      if (err) { cb(err); } else {

        exec(command, opts, cb);

      }

    });

  }

  async.eachSeries(commands, _exec, cb);

}

exports.exec = exec;

exports.execSeries = execSeries;