/**
   * @fileoverview Module for loading rules from files and directories.
   * @author Michael Ficarra
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const fs = require("fs"),
      path = require("path");
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  /**
   * Load all rule modules from specified directory.
   * @param {string} [rulesDir] Path to rules directory, may be relative. Defaults to `lib/rules`.
   * @param {string} cwd Current working directory
   * @returns {Object} Loaded rule modules by rule ids (file names).
   */
  module.exports = function(rulesDir, cwd) {
      if (!rulesDir) {
          rulesDir = path.join(__dirname, "rules");
      } else {
          rulesDir = path.resolve(cwd, rulesDir);
      }
  
      const rules = Object.create(null);
  
      fs.readdirSync(rulesDir).forEach(file => {
          if (path.extname(file) !== ".js") {
              return;
          }
          rules[file.slice(0, -3)] = path.join(rulesDir, file);
      });
      return rules;
  };