paco/dist/helpers/local-npm.js

Node package development/distribution utility kit

#!/usr/bin/env node
'use strict';

var path = require('path');
var comeondo = require('comeondo');
var Q = require('q');

var pathHelpers = require('./paths');

/**
 * Returns a path to the nearest package.json config containing a
 * npm script with a given name.
 */
function getNearestPackageJsonWithTask(task) {
  var packageJsonPaths = pathHelpers.getTraversedFilesNamed('package.json', {
    stopAt: process.env.PACO_ROOT_PATH
  });

  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = packageJsonPaths[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var filepath = _step.value;

      var info = require(filepath);

      if (info.scripts && info.scripts[task]) {
        return filepath;
      }
    }
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  return null;
}

/**
 * Checks if an npm script, optionally searching parent modules.
 */
function hasTask(task) {
  var opts = arguments.length <= 1 || arguments[1] === undefined ? { traverse: true } : arguments[1];

  var packageJsonPath = opts.traverse ? getNearestPackageJsonWithTask(task) : process.env.PACO_PACKAGE_JSON_PATH;

  if (packageJsonPath) {
    var packageJson = require(packageJsonPath);
    return !!(packageJson.scripts && packageJson.scripts[task]);
  }

  return false;
}

/**
 * Runs an npm script, optionally in parent modules with a $PACO_CWD
 * node environment variable.
 */
function runTask(task) {
  var opts = arguments.length <= 1 || arguments[1] === undefined ? { traverse: true } : arguments[1];

  opts.cwd = opts.cwd || process.cwd();

  var taskPackageJsonPath = opts.traverse ? getNearestPackageJsonWithTask(task) : process.env.PACO_PACKAGE_JSON_PATH;

  if (taskPackageJsonPath) {
    return comeondo.exec('npm run ' + task, {
      cwd: path.dirname(taskPackageJsonPath),
      env: Object.assign({}, process.env, {
        PACO_CWD: opts.cwd
      })
    });
  }

  return Q(null);
}

module.exports = {
  getNearestPackageJsonWithTask: getNearestPackageJsonWithTask,
  hasTask: hasTask,
  runTask: runTask
};