Node utility functions for crawling files (for when you want to check a bunch of repos without bash)

node-crawling-utils.js

/*
 * Run in a directory with a bunch of subdirectories.
 *
 * Example: Get all subdirectories with names ending in '-design'
 *
 * ```
 * const subdirs = getDirectories(__dirname).filter(isMatch.bind(null, /\-design$/));
 * ```
 *
 * Example: Get all subdirectories that have any subfiles named *.es6.js
 *
 * ```
 * const hasES6File = source => getFiles(source).filter(isMatch.bind(null, /\.es6\.js$/)).length > 0;
 * const dirsWithES6 = getDirectories(__dirname).filter(hasES6File);
 * ```
 *
 * Thanks to https://stackoverflow.com/questions/18112204/get-all-directories-within-directory-nodejs
 * for many of the methods below.
 */

const fs = require('fs');
const path = require('path');

const isDirectory = source => fs.lstatSync(source).isDirectory();
const isFile = source => fs.lstatSync(source).isFile();
const isMatch = (regex, source) => regex.test(source);
const getDirectories = source =>
  fs.readdirSync(source).map(name => path.join(source, name)).filter(isDirectory);
const getFiles = source =>
  fs.readdirSync(source).map(name => path.join(source, name)).filter(isFile);