g13013/broccoli-compass

var fs = require('fs');
var path = require('path');
var splice = Array.prototype.splice;

module.exports = walkCachedSync;

function mapFn(file) {
  return this + '/' + file;
}

function walkCachedSync(baseDir, options) {
  baseDir = baseDir || '.';
  options = options || {};
  var file, sub, oldHash;
  var cache = options.cache && options.cache.paths || {};
  var paths = fs.readdirSync(baseDir).sort();
  var len = paths.length;
  var ignore = options.ignore;
  dirStats = {paths: {}};
  dirStats.baseDir = path.resolve(process.cwd() + '/' + baseDir);
  dirStats.changed = [];
  for(var i = 0; i < len; i += 1) {
    file = paths[i];
    if (ignore && ignore.test(file)) {
      continue;
    }
    oldHash = cache[file] && cache[file].statsHash;
    dirStats.paths[file] = {};
    try {
      stats = fs.statSync(baseDir + '/' + file);
    } catch (err) {
      console.warn('Warning: failed to stat ' + file, err.message);
      continue;
    }
    dirStats.paths[file].statsHash = stats.mode + '_' + stats.size + '_' + stats.mtime.getTime();
    if (!oldHash || dirStats.paths[file].statsHash !== oldHash) {
      dirStats.changed.push(file);
    }
    if (stats.isDirectory()) {
      dirStats.paths[file].isDirectory = true;
      sub = fs.readdirSync(baseDir + '/' + file).sort().map(mapFn.bind(file));
      len += sub.length;
      splice.apply(paths, [i + 1, 0].concat(sub));
    }
    dirStats.paths[file].stats = stats;
  }
  return dirStats;
}