gulpfile.js

var gulp = require('gulp');
var initGulpTasks = require('react-pack');
var request = require('request');
var cheerio = require('cheerio');
var fs = require('fs');

var taskConfig = require('./config');

initGulpTasks(gulp, taskConfig);

gulp.task('getoptions', function () {
  request('http://www.daterangepicker.com/', function (error, response, body) {
    var $ = cheerio.load(body);
    var options = $('#options ul li code').map(function () {
      return $(this).text().trim();
    }).get();
    // add options that aren't documented
    options.push('template');
    // de-dupe and sort
    options = options.filter(function (item, index) {
      return options.indexOf(item) === index;
    }).sort();

    fs.writeFile('./src/get-options.js', [
      '/* generated by gulpfile.js */',
      'module.exports = exports = function () {',
      '\treturn ' + JSON.stringify(options, null, '\t\t') + ';',
      '};'
    ].join('\n'), 'utf-8');

    // fix options that contain html strings
    options = options.map(function (option) {
      return option.replace(/\</gi, '&lt;').replace(/\>/gi, '&gt;');
    });
    // update README.md
    var before = 'You can pass all the same props as the original plugin:',
      after = 'You can listen to the following 7 events:',
      readme = fs.readFileSync('./README.md').toString(),
      newReadme = readme.slice(0, readme.indexOf(before) + before.length) +
        '\n\n- **' +
        wrap(options.join(', ')).slice(2) +
        '**\n\n' +
        readme.slice(readme.indexOf(after));
    fs.writeFileSync('./README.md', newReadme, 'utf-8');
  });
});