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

const isWin32 = os.platform() === 'win32';

const dirTraveler = (dir: string, match?: RegExp) => {
  const base = dir;
  const memo: {
    [key: string]: string;
  } = {};
  (function walk(p) {
    try {
      const stats = fs.statSync(p);
      if (stats.isDirectory()) {
        const files = fs.readdirSync(p);
        files.forEach((file: string) => {
          if (/^\./.test(file)) {
            return;
          }
          walk(path.resolve(p, file));
        });
      } else {
        let key = path.relative(base, p);
        if (isWin32) {
          key = key.replace(/\\/g, '/');
        }
        if (!match || match.test(key)) {
          memo[key] = p;
        }
      }
    } catch (e) {
      throw e;
    }
  })(dir);
  return memo;
};

(dirTraveler as any).default = dirTraveler;

export = dirTraveler;