#!/usr/bin/env node
var gift = require('gift'),
    fs = require('fs'),
    argv = require('optimist')
      .usage('Update vtt.jsm with the latest from a vtt.js directory.\nUsage:' +
             ' $0 -d [dir]')
      .demand('d')
      .options('d', {
        alias: 'dir',
        describe: 'Path to WebVTT directory.'
      })
      .options('r', {
        alias: 'rev',
        describe: 'Revision to update to.',
        default: 'master'
      })
      .options('w', {
        alias: 'write',
        describe: 'Path to file to write to.',
        default: "./vtt.jsm"
      })
      .argv;

var repo = gift(argv.d);
repo.status(function(err, status) {
  if (!status.clean) {
    console.log("The repository's working directory is not clean. Aborting.");
    process.exit(1);
  }
  repo.checkout(argv.r, function() {
    repo.commits(argv.r, 1, function(err, commits) {
      var vttjs = fs.readFileSync(argv.d + "/lib/vtt.js", 'utf8');

      // Remove settings for VIM and Emacs.
      vttjs = vttjs.replace(/\/\* -\*-.*-\*- \*\/\n/, '');
      vttjs = vttjs.replace(/\/\* vim:.* \*\/\n/, '');

      // Concatenate header and vttjs code.
      vttjs =
        '/* This Source Code Form is subject to the terms of the Mozilla Public\n' +
        ' * License, v. 2.0. If a copy of the MPL was not distributed with this\n' +
        ' * file, You can obtain one at http://mozilla.org/MPL/2.0/. */\n\n' +
        'this.EXPORTED_SYMBOLS = ["WebVTT"];\n\n' +
        '/**\n' +
        ' * Code below is vtt.js the JS WebVTT implementation.\n' +
        ' * Current source code can be found at http://github.com/mozilla/vtt.js\n' +
        ' *\n' +
        ' * Code taken from commit ' + commits[0].id + '\n' +
        ' */\n' +
        vttjs;

      fs.writeFileSync(argv.w, vttjs);
    });
});
});