Reacting to events
==================

Overview
--------

This example will show you how to react to the `torrent.finished` event and
write the info hash to a file when it finishes.

Example code
------------

.. code:: javascript

  var fs      = require("fs");
  var session = require("bittorrent").session;

  // File to write torrent info hashes to.
  var file = "C:/Temp/finished-torrents.json";

  function torrentFinished(args) {
    var contents = [];

    if(fs.fileExists(file)) {
      contents = JSON.parse(fs.readText(file));
    }

    // Add our info hash to the array.
    contents.push(args.torrent.infoHash);

    // Write the results to the file.
    fs.writeText(file, JSON.stringify(contents));
  }

  exports.load = function() {
    session.on("torrent.finished" torrentFinished);
  };