division/lib/extensions/watch.js

Simple yet powerful wrapper over node.js cluster API. This module is inspired by impressive, but abandoned project Cluster created by TJ Holowaychuk.

var fs, path;

fs = require('fs');

path = require('path');

module.exports = function(files, options) {
  var extensions, ignored, interval, resolvePath, traverse, watch, __dirname__;
  if (options == null) {
    options = {};
  }
  __dirname__ = process.cwd();
  if (!files) {
    files = __dirname__;
  }
  if (!Array.isArray(files)) {
    files = [files];
  }
  ignored = ['node_modules', 'test', 'bin', '.git'].concat(options.ignored);
  interval = options.interval || 100;
  extensions = options.extensions || ['.js'];
  resolvePath = function(path) {
    if ('/' === path[0]) {
      return path;
    } else {
      return __dirname__ + '/' + path;
    }
  };
  traverse = function(file) {
    file = resolvePath(path.normalize(file));
    return fs.stat(file, function(error, stat) {
      if (!error) {
        if (stat.isDirectory()) {
          if (~ignored.indexOf(path.basename(file))) {
            return;
          }
          return fs.readdir(file, function(err, files) {
            return files.map(function(f) {
              return file + '/' + f;
            }).forEach(traverse);
          });
        } else {
          if (file !== process.argv[1]) {
            return watch(file);
          }
        }
      }
    });
  };
  watch = (function(_this) {
    return function(file) {
      if (!~extensions.indexOf(path.extname(file))) {
        return;
      }
      return fs.watchFile(file, {
        interval: interval,
        persistent: false
      }, function(curr, prev) {
        if (curr.mtime > prev.mtime) {
          _this.emit('filechange', file);
          return _this.restart();
        }
      });
    };
  })(this);
  return files.forEach(traverse);
};