hyde.module

<?php

/**
 * Implements hook_menu().
 */
function hyde_menu() {
  _hyde_init();
  $hyde_path = _hyde_path();

  $files = file_scan_directory($hyde_path, '/\.md$/');
  $items = array();
  foreach ($files as $file) {
    $rel_path = substr($file->uri, 1 + strlen($hyde_path));
    $name = preg_replace(';\.md$;', '', $rel_path);
    $items[$name] = array(
      'page callback' => '_hyde_render',
      'page arguments' => [$rel_path],
      'access callback' => TRUE,
    );
  }

  return $items;
}

/**
 * @param string $rel_path
 *   The relative path to the Markdown document.
 * @return string
 *   Rendered HTML document.
 * @throws \Exception
 */
function _hyde_render($rel_path) {
  _hyde_init();

  if (strpos($rel_path, '..') !== FALSE) {
    throw new Exception("I don't like your filename. Yes, this is too persnickity.");
  }

  $md_file = _hyde_path() . DIRECTORY_SEPARATOR . $rel_path;
  if (!file_exists($md_file)) {
    drupal_not_found();
  }

  $markdown = file_get_contents($md_file);
  list($headers, $markdown) = _hyde_parse_headers($markdown);

  if (isset($headers['title'])) {
    drupal_set_title($headers['title']);
  }

  $parser = new Parsedown();
  return
    $parser->text($markdown);
}

/**
 * Split apart the YAML headers and the main content of the Markdown document.
 *
 * @param string $markdown
 *   Ex: "---\ntitle: \"War and Peace\"\n---\nHello world"
 * @return array
 *   Array(0 => $headers, 1 => $markdownText).
 *   Ex: [['title' => 'War and Peace'], 'Hello world']
 */
function _hyde_parse_headers($markdown) {
  $headers = array();
  if (preg_match(';^---\n(.*)\n---\n;m', $markdown, $matches)) {
    $headers = Symfony\Component\Yaml\Yaml::parse($matches[1]);
    $markdown = preg_replace(';^---\n(.*)\n---\n;m', '', $markdown, 1);
  }
  return array($headers, $markdown);
}

/**
 * Ensure that all classes/resources are available.
 */
function _hyde_init() {
  if (file_exists(__DIR__ . DIRECTORY_SEPARATOR . 'vendor')) {
    // It seems we installed with composer inside this repo. What dirty proof-of-concept hacking is this.
    require_once __DIR__ . DIRECTORY_SEPARATOR . 'vendor' . DIRECTORY_SEPARATOR . 'autoload.php';
  }
}

/**
 * Get the storage path for Markdown content.
 *
 * @return string
 */
function _hyde_path() {
  return variable_get('hyde_path', variable_get('file_private_path') . DIRECTORY_SEPARATOR . 'hyde');
}