watcher/main.js at master · korint/watcher · GitHub

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var sys = require('util'),
  fs = require('fs'),
  path = require('path'),
  events = require('events');


/**
 * Recursive file tree walker
 * @param  {String}   dir
 * @param  {[type]}   [options]
 * @param  {Function} callback
 */
var walk = function(dir, options, callback) {
    if(!callback) {
      callback = options;
      options = {};
    }
    if(!callback.files) {
      callback.files = {};
    }
    if(!callback.pending) {
      callback.pending = 0;
    }
    callback.pending += 1;

    fs.stat(dir, function(err, stat) {
      // can't get file stats
      if(err) {
        return callback(err);
      }
      callback.files[dir] = stat;
      fs.readdir(dir, function(err, files) {
        // can't read dir
        if(err) {
          return callback(err);
        }
        callback.pending -= 1;

        files.forEach(function(f, index) {
          f = path.join(dir, f);
          callback.pending += 1;

          fs.stat(f, function(err, stat) {
            var enoent = false,
              done = false;

            if(err) {
              if(err.code !== 'ENOENT') {
                return callback(err);
              } else {
                enoent = true;
              }
            }
            callback.pending -= 1;

            done = callback.pending === 0;

            if(!enoent) {
              if(options.ignoreDotFiles && path.basename(f)[0] === '.') {
                return done && callback(null, callback.files);
              }
              if(options.filter && options.filter(f, stat)) {
                return done && callback(null, callback.files);
              }
              callback.files[f] = stat;

              // recursion
              if(stat.isDirectory()) {
                walk(f, options, callback);
              }

              // done
              if(done) {
                callback(null, callback.files);
              }
            }
          });
        });
        if(callback.pending === 0) {
          callback(null, callback.files);
        }
      })

      if(callback.pending === 0) {
        callback(null, callback.files);
      }
    });
  };


var watchTree = function(root, options, callback) {
    if(!callback) {
      callback = options;
      options = {};
    }
    walk(root, options, function(err, files) {
      if(err) {
        throw err;
      }
      var fileWatcher = function(f) {
          fs.watchFile(f, options, function(c, p) {
            // Check if anything actually changed in stat
            if(files[f] && !files[f].isDirectory() && c.nlink !== 0 && files[f].mtime.getTime() == c.mtime.getTime()) {
              return;
            }

            files[f] = c;
            if(!files[f].isDirectory()) {
              callback(f, c, p);
            } else {
              fs.readdir(f, function(err, nfiles) {
                if(err) {
                  return;
                }

                nfiles.forEach(function(b) {
                  var file = path.join(f, b);
                  if(!files[file]) {
                    fs.stat(file, function(err, stat) {
                      callback(file, stat, null);
                      files[file] = stat;
                      fileWatcher(file);
                    });
                  }
                });
              });
            }

            if(c.nlink === 0) {
              // unwatch removed files.
              delete files[f];
              fs.unwatchFile(f);
            }
          });
        };

      fileWatcher(root);
      for(var i in files) {
        fileWatcher(i);
      }
      callback(files, null, null);
    })
  };

exports.monitor = function(root, options, callback) {
  if(!callback) {
    callback = options;
    options = {};
  }
  var monitor = new events.EventEmitter();
  watchTree(root, options, function(f, curr, prev) {
    if(typeof f == "object" && prev == null && curr === null) {
      monitor.files = f;
      return callback(monitor);
    }
    if(prev === null) {
      return monitor.emit("created", f, curr);
    }
    if(curr.nlink === 0) {
      return monitor.emit("removed", f, curr);
    }
    monitor.emit("changed", f, curr, prev);
  })
};