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Drupal example source code file (wysiwyg.module)

This example Drupal source code file (wysiwyg.module) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, callback, directory, editors, file, foreach, function, if, isset, path, php, profile, return, variable

The wysiwyg.module Drupal example source code

<?php
// $Id: wysiwyg.module,v 1.51 2011/01/06 01:43:26 sun Exp $

/**
 * @file
 * Integrate client-side editors with Drupal.
 */

/**
 * Implementation of hook_menu().
 */
function wysiwyg_menu() {
  $items['admin/config/content/wysiwyg'] = array(
    'title' => 'Wysiwyg profiles',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('wysiwyg_profile_overview'),
    'description' => 'Configure client-side editors.',
    'access arguments' => array('administer filters'),
    'file' => 'wysiwyg.admin.inc',
  );
  $items['admin/config/content/wysiwyg/profile'] = array(
    'title' => 'List',
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['admin/config/content/wysiwyg/profile/%wysiwyg_profile/edit'] = array(
    'title' => 'Edit',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('wysiwyg_profile_form', 5),
    'access arguments' => array('administer filters'),
    'file' => 'wysiwyg.admin.inc',
    'tab_root' => 'admin/config/content/wysiwyg/profile',
    'tab_parent' => 'admin/config/content/wysiwyg/profile/%wysiwyg_profile',
    'type' => MENU_LOCAL_TASK,
  );
  $items['admin/config/content/wysiwyg/profile/%wysiwyg_profile/delete'] = array(
    'title' => 'Remove',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('wysiwyg_profile_delete_confirm', 5),
    'access arguments' => array('administer filters'),
    'file' => 'wysiwyg.admin.inc',
    'tab_root' => 'admin/config/content/wysiwyg/profile',
    'tab_parent' => 'admin/config/content/wysiwyg/profile/%wysiwyg_profile',
    'type' => MENU_LOCAL_TASK,
    'weight' => 10,
  );
  $items['wysiwyg/%'] = array(
    'page callback' => 'wysiwyg_dialog',
    'page arguments' => array(1),
    'access arguments' => array('access content'),
    'type' => MENU_CALLBACK,
    'file' => 'wysiwyg.dialog.inc',
  );
  return $items;
}

/**
 * Implementation of hook_theme().
 *
 * @see drupal_common_theme(), common.inc
 * @see template_preprocess_page(), theme.inc
 */
function wysiwyg_theme() {
  return array(
    'wysiwyg_profile_overview' => array(
      'render element' => 'form',
    ),
    'wysiwyg_admin_button_table' => array(
      'render element' => 'form',
    ),
    'wysiwyg_dialog_page' => array(
      'variables' => array('content' => NULL, 'show_messages' => TRUE),
      'file' => 'wysiwyg.dialog.inc',
      'template' => 'wysiwyg-dialog-page',
    ),
  );
}

/**
 * Implementation of hook_help().
 */
function wysiwyg_help($path, $arg) {
  switch ($path) {
    case 'admin/config/content/wysiwyg':
      $output = '<p>' . t('A Wysiwyg profile is associated with an input format. A Wysiwyg profile defines which client-side editor is loaded with a particular input format, what buttons or themes are enabled for the editor, how the editor is displayed, and a few other editor-specific functions.') . '</p>';
      return $output;
  }
}

/**
 * Implementation of hook_form_alter().
 */
function wysiwyg_form_alter(&$form, &$form_state) {
  // Teaser splitter is unconditionally removed and NOT supported.
  if (isset($form['body_field'])) {
    unset($form['body_field']['teaser_js']);
  }
}

/**
 * Implements hook_element_info_alter().
 */
function wysiwyg_element_info_alter(&$types) {
  $types['text_format']['#pre_render'][] = 'wysiwyg_pre_render_text_format';
}

/**
 * Process a text format widget to load and attach editors.
 *
 * The element's #id is used as reference to attach client-side editors.
 */
function wysiwyg_pre_render_text_format($element) {
  // filter_process_format() copies properties to the expanded 'value' child
  // element. Skip this text format widget, if it contains no 'format' or when
  // the current user does not have access to edit the value.
  if (!isset($element['format']) || !empty($element['value']['#disabled'])) {
    return $element;
  }

  $format_field = &$element['format'];
  $field = &$element['value'];
  $settings = array(
    'field' => $field['#id'],
  );

  // If this textarea is #resizable and we will load at least one
  // editor, then only load the behavior and let the 'none' editor
  // attach/detach it to avoid hi-jacking the UI. Due to our CSS class
  // parsing, we can add arbitrary parameters for each input format.
  // The #resizable property will be removed below, if at least one
  // profile has been loaded.
  $resizable = 0;
  if (!empty($field['#resizable'])) {
    $resizable = 1;
    drupal_add_js('misc/textarea.js');
  }
  // Determine the available text formats.
  foreach ($format_field['format']['#options'] as $format_id => $format_name) {
    $format = 'format' . $format_id;
    // Initialize default settings, defaulting to 'none' editor.
    $settings[$format] = array(
      'editor' => 'none',
      'status' => 1,
      'toggle' => 1,
      'resizable' => $resizable,
    );

    // Fetch the profile associated to this text format.
    $profile = wysiwyg_get_profile($format_id);
    if ($profile) {
      $loaded = TRUE;
      $settings[$format]['editor'] = $profile->editor;
      $settings[$format]['status'] = (int) wysiwyg_user_get_status($profile);
      if (isset($profile->settings['show_toggle'])) {
        $settings[$format]['toggle'] = (int) $profile->settings['show_toggle'];
      }
      // Check editor theme (and reset it if not/no longer available).
      $theme = wysiwyg_get_editor_themes($profile, (isset($profile->settings['theme']) ? $profile->settings['theme'] : ''));

      // Add plugin settings (first) for this text format.
      wysiwyg_add_plugin_settings($profile);
      // Add profile settings for this text format.
      wysiwyg_add_editor_settings($profile, $theme);
    }
  }
  // Use a hidden element for a single text format.
  if (!$format_field['format']['#access']) {
    $format_field['wysiwyg'] = array(
      '#type' => 'hidden',
      '#name' => $format_field['format']['#name'],
      '#value' => $format_id,
      '#attributes' => array(
        'id' => $format_field['format']['#id'],
        'class' => array('wysiwyg'),
      ),
    );
    $format_field['wysiwyg']['#attached']['js'][] = array(
      'data' => array(
        'wysiwyg' => array(
          'triggers' => array(
            $format_field['format']['#id'] => $settings,
          ),
        ),
      ),
      'type' => 'setting',
    );
  }
  // Otherwise, attach to text format selector.
  else {
    $format_field['format']['#attributes']['class'][] = 'wysiwyg';
    $format_field['format']['#attached']['js'][] = array(
      'data' => array(
        'wysiwyg' => array(
          'triggers' => array(
            $format_field['format']['#id'] => $settings,
          ),
        ),
      ),
      'type' => 'setting',
    );
  }

  // If we loaded at least one editor, then the 'none' editor will
  // handle resizable textareas instead of core.
  if (isset($loaded) && $resizable) {
    $field['#resizable'] = FALSE;
  }

  return $element;
}

/**
 * Determine the profile to use for a given input format id.
 *
 * This function also performs sanity checks for the configured editor in a
 * profile to ensure that we do not load a malformed editor.
 *
 * @param $format
 *   The internal id of an input format.
 *
 * @return
 *   A wysiwyg profile.
 *
 * @see wysiwyg_load_editor(), wysiwyg_get_editor()
 */
function wysiwyg_get_profile($format) {
  if ($profile = wysiwyg_profile_load($format)) {
    if (wysiwyg_load_editor($profile)) {
      return $profile;
    }
  }
  return FALSE;
}

/**
 * Load an editor library and initialize basic Wysiwyg settings.
 *
 * @param $profile
 *   A wysiwyg editor profile.
 *
 * @return
 *   TRUE if the editor has been loaded, FALSE if not.
 *
 * @see wysiwyg_get_profile()
 */
function wysiwyg_load_editor($profile) {
  static $settings_added;
  static $loaded = array();

  $name = $profile->editor;
  // Library files must be loaded only once.
  if (!isset($loaded[$name])) {
    // Load editor.
    $editor = wysiwyg_get_editor($name);
    if ($editor) {
      // Determine library files to load.
      // @todo Allow to configure the library/execMode to use.
      if (isset($profile->settings['library']) && isset($editor['libraries'][$profile->settings['library']])) {
        $library = $profile->settings['library'];
        $files = $editor['libraries'][$library]['files'];
      }
      else {
        // Fallback to the first defined library by default (external libraries can change).
        $library = key($editor['libraries']);
        $files = array_shift($editor['libraries']);
        $files = $files['files'];
      }
      foreach ($files as $file => $options) {
        if (is_array($options)) {
          $options += array('type' => 'file', 'scope' => 'header', 'defer' => FALSE, 'cache' => TRUE, 'preprocess' => TRUE);
          drupal_add_js($editor['library path'] . '/' . $file, $options);
        }
        else {
          drupal_add_js($editor['library path'] . '/' . $options);
        }
      }
      // If editor defines an additional load callback, invoke it.
      // @todo Isn't the settings callback sufficient?
      if (isset($editor['load callback']) && function_exists($editor['load callback'])) {
        $editor['load callback']($editor, $library);
      }
      // Load JavaScript integration files for this editor.
      $files = array();
      if (isset($editor['js files'])) {
        $files = $editor['js files'];
      }
      foreach ($files as $file) {
        drupal_add_js($editor['js path'] . '/' . $file);
      }
      // Load CSS stylesheets for this editor.
      $files = array();
      if (isset($editor['css files'])) {
        $files = $editor['css files'];
      }
      foreach ($files as $file) {
        drupal_add_css($editor['css path'] . '/' . $file);
      }

      drupal_add_js(array('wysiwyg' => array(
        'configs' => array($editor['name'] => array('global' => array(
          // @todo Move into (global) editor settings.
          // If JS compression is enabled, at least TinyMCE is unable to determine
          // its own base path and exec mode since it can't find the script name.
          'editorBasePath' => base_path() . $editor['library path'],
          'execMode' => $library,
        ))),
      )), 'setting');

      $loaded[$name] = TRUE;
    }
    else {
      $loaded[$name] = FALSE;
    }
  }

  // Add basic Wysiwyg settings if any editor has been added.
  if (!isset($settings_added) && $loaded[$name]) {
    drupal_add_js(array('wysiwyg' => array(
      'configs' => array(),
      'plugins' => array(),
      'disable' => t('Disable rich-text'),
      'enable' => t('Enable rich-text'),
    )), 'setting');

    $path = drupal_get_path('module', 'wysiwyg');
    // Initialize our namespaces in the *header* to do not force editor
    // integration scripts to check and define Drupal.wysiwyg on its own.
    drupal_add_js($path . '/wysiwyg.init.js', array('group' => JS_LIBRARY));

    // The 'none' editor is a special editor implementation, allowing us to
    // attach and detach regular Drupal behaviors just like any other editor.
    drupal_add_js($path . '/editors/js/none.js');

    // Add wysiwyg.js to the footer to ensure it's executed after the
    // Drupal.settings array has been rendered and populated. Also, since editor
    // library initialization functions must be loaded first by the browser,
    // and Drupal.wysiwygInit() must be executed AFTER editors registered
    // their callbacks and BEFORE Drupal.behaviors are applied, this must come
    // last.
    drupal_add_js($path . '/wysiwyg.js', array('scope' => 'footer'));

    $settings_added = TRUE;
  }

  return $loaded[$name];
}

/**
 * Add editor settings for a given input format.
 */
function wysiwyg_add_editor_settings($profile, $theme) {
  static $formats = array();

  if (!isset($formats[$profile->format])) {
    $config = wysiwyg_get_editor_config($profile, $theme);
    // drupal_to_js() does not properly convert numeric array keys, so we need
    // to use a string instead of the format id.
    if ($config) {
      drupal_add_js(array('wysiwyg' => array('configs' => array($profile->editor => array('format' . $profile->format => $config)))), 'setting');
    }
    $formats[$profile->format] = TRUE;
  }
}

/**
 * Add settings for external plugins.
 *
 * Plugins can be used in multiple profiles, but not necessarily in all. Because
 * of that, we need to process plugins for each profile, even if most of their
 * settings are not stored per profile.
 *
 * Implementations of hook_wysiwyg_plugin() may execute different code for each
 * editor. Therefore, we have to invoke those implementations for each editor,
 * but process the resulting plugins separately for each profile.
 *
 * Drupal plugins differ to native plugins in that they have plugin-specific
 * definitions and settings, which need to be processed only once. But they are
 * also passed to the editor to prepare settings specific to the editor.
 * Therefore, we load and process the Drupal plugins only once, and hand off the
 * effective definitions for each profile to the editor.
 *
 * @param $profile
 *   A wysiwyg editor profile.
 *
 * @todo Rewrite wysiwyg_process_form() to build a registry of effective
 *   profiles in use, so we can process plugins in multiple profiles in one shot
 *   and simplify this entire function.
 */
function wysiwyg_add_plugin_settings($profile) {
  static $plugins = array();
  static $processed_plugins = array();
  static $processed_formats = array();

  // Each input format must only processed once.
  // @todo ...as long as we do not have multiple profiles per format.
  if (isset($processed_formats[$profile->format])) {
    return;
  }
  $processed_formats[$profile->format] = TRUE;

  $editor = wysiwyg_get_editor($profile->editor);

  // Collect native plugins for this editor provided via hook_wysiwyg_plugin()
  // and Drupal plugins provided via hook_wysiwyg_include_directory().
  if (!array_key_exists($editor['name'], $plugins)) {
    $plugins[$editor['name']] = wysiwyg_get_plugins($editor['name']);
  }

  // Nothing to do, if there are no plugins.
  if (empty($plugins[$editor['name']])) {
    return;
  }

  // Determine name of proxy plugin for Drupal plugins.
  $proxy = (isset($editor['proxy plugin']) ? key($editor['proxy plugin']) : '');

  // Process native editor plugins.
  if (isset($editor['plugin settings callback'])) {
    // @todo Require PHP 5.1 in 3.x and use array_intersect_key().
    $profile_plugins_native = array();
    foreach ($plugins[$editor['name']] as $plugin => $meta) {
      // Skip Drupal plugins (handled below).
      if ($plugin === $proxy) {
        continue;
      }
      // Only keep native plugins that are enabled in this profile.
      if (isset($profile->settings['buttons'][$plugin])) {
        $profile_plugins_native[$plugin] = $meta;
      }
    }
    // Invoke the editor's plugin settings callback, so it can populate the
    // settings for native external plugins with required values.
    $settings_native = call_user_func($editor['plugin settings callback'], $editor, $profile, $profile_plugins_native);

    if ($settings_native) {
      drupal_add_js(array('wysiwyg' => array('plugins' => array('format' . $profile->format => array('native' => $settings_native)))), 'setting');
    }
  }

  // Process Drupal plugins.
  if ($proxy && isset($editor['proxy plugin settings callback'])) {
    $profile_plugins_drupal = array();
    foreach (wysiwyg_get_all_plugins() as $plugin => $meta) {
      if (isset($profile->settings['buttons'][$proxy][$plugin])) {
        // JavaScript and plugin-specific settings for Drupal plugins must be
        // loaded and processed only once. Plugin information is cached
        // statically to pass it to the editor's proxy plugin settings callback.
        if (!isset($processed_plugins[$proxy][$plugin])) {
          $profile_plugins_drupal[$plugin] = $processed_plugins[$proxy][$plugin] = $meta;
          // Load the Drupal plugin's JavaScript.
          drupal_add_js($meta['js path'] . '/' . $meta['js file']);
          // Add plugin-specific settings.
          if (isset($meta['settings'])) {
            drupal_add_js(array('wysiwyg' => array('plugins' => array('drupal' => array($plugin => $meta['settings'])))), 'setting');
          }
        }
        else {
          $profile_plugins_drupal[$plugin] = $processed_plugins[$proxy][$plugin];
        }
      }
    }
    // Invoke the editor's proxy plugin settings callback, so it can populate
    // the settings for Drupal plugins with custom, required values.
    $settings_drupal = call_user_func($editor['proxy plugin settings callback'], $editor, $profile, $profile_plugins_drupal);

    if ($settings_drupal) {
      drupal_add_js(array('wysiwyg' => array('plugins' => array('format' . $profile->format => array('drupal' => $settings_drupal)))), 'setting');
    }
  }
}

/**
 * Retrieve available themes for an editor.
 *
 * Editor themes control the visual presentation of an editor.
 *
 * @param $profile
 *   A wysiwyg editor profile; passed/altered by reference.
 * @param $selected_theme
 *   An optional theme name that ought to be used.
 *
 * @return
 *   An array of theme names, or a single, checked theme name if $selected_theme
 *   was given.
 */
function wysiwyg_get_editor_themes(&$profile, $selected_theme = NULL) {
  static $themes = array();

  if (!isset($themes[$profile->editor])) {
    $editor = wysiwyg_get_editor($profile->editor);
    if (isset($editor['themes callback']) && function_exists($editor['themes callback'])) {
      $themes[$editor['name']] = $editor['themes callback']($editor, $profile);
    }
    // Fallback to 'default' otherwise.
    else {
      $themes[$editor['name']] = array('default');
    }
  }

  // Check optional $selected_theme argument, if given.
  if (isset($selected_theme)) {
    // If the passed theme name does not exist, use the first available.
    if (!in_array($selected_theme, $themes[$profile->editor])) {
      $selected_theme = $profile->settings['theme'] = $themes[$profile->editor][0];
    }
  }

  return isset($selected_theme) ? $selected_theme : $themes[$profile->editor];
}

/**
 * Return plugin metadata from the plugin registry.
 *
 * @param $editor_name
 *   The internal name of an editor to return plugins for.
 *
 * @return
 *   An array for each plugin.
 */
function wysiwyg_get_plugins($editor_name) {
  $plugins = array();
  if (!empty($editor_name)) {
    $editor = wysiwyg_get_editor($editor_name);
    // Add internal editor plugins.
    if (isset($editor['plugin callback']) && function_exists($editor['plugin callback'])) {
      $plugins = $editor['plugin callback']($editor);
    }
    // Add editor plugins provided via hook_wysiwyg_plugin().
    $plugins = array_merge($plugins, module_invoke_all('wysiwyg_plugin', $editor['name'], $editor['installed version']));
    // Add API plugins provided by Drupal modules.
    // @todo We need to pass the filepath to the plugin icon for Drupal plugins.
    if (isset($editor['proxy plugin'])) {
      $plugins += $editor['proxy plugin'];
      $proxy = key($editor['proxy plugin']);
      foreach (wysiwyg_get_all_plugins() as $plugin_name => $info) {
        $plugins[$proxy]['buttons'][$plugin_name] = $info['title'];
      }
    }
  }
  return $plugins;
}

/**
 * Return an array of initial editor settings for a Wysiwyg profile.
 */
function wysiwyg_get_editor_config($profile, $theme) {
  $editor = wysiwyg_get_editor($profile->editor);
  $settings = array();
  if (!empty($editor['settings callback']) && function_exists($editor['settings callback'])) {
    $settings = $editor['settings callback']($editor, $profile->settings, $theme);

    // Allow other modules to alter the editor settings for this format.
    $context = array('editor' => $editor, 'profile' => $profile, 'theme' => $theme);
    drupal_alter('wysiwyg_editor_settings', $settings, $context);
  }
  return $settings;
}

/**
 * Retrieve stylesheets for HTML/IFRAME-based editors.
 *
 * This assumes that the content editing area only needs stylesheets defined
 * for the scope 'theme'.
 *
 * @return
 *   An array containing CSS files, including proper base path.
 */
function wysiwyg_get_css() {
  static $files;

  if (isset($files)) {
    return $files;
  }
  // In node form previews, the theme has not been initialized yet.
  if (!empty($_POST)) {
    drupal_theme_initialize();
  }

  $files = array();
  foreach (drupal_add_css() as $filepath => $info) {
    if ($info['group'] >= CSS_THEME && $info['media'] != 'print') {
      if (file_exists($filepath)) {
        $files[] = base_path() . $filepath;
      }
    }
  }
  return $files;
}

/**
 * Load profile for a given input format.
 */
function wysiwyg_profile_load($format) {
  static $profiles;

  if ($cached = cache_get('wysiwyg_profiles')) {
    $profiles = $cached->data;
  }
  else {
    $result = db_query('SELECT format, editor, settings FROM {wysiwyg}');
    foreach ($result as $profile) {
      $profile->settings = unserialize($profile->settings);
      $profiles[$profile->format] = $profile;
    }
    cache_set('wysiwyg_profiles', $profiles);
  }

  return (isset($profiles[$format]) ? $profiles[$format] : FALSE);
}

/**
 * Load all profiles.
 */
function wysiwyg_profile_load_all() {
  static $profiles;

  if (!isset($profiles)) {
    $profiles = array();
    $result = db_query('SELECT format, editor, settings FROM {wysiwyg}');
    foreach ($result as $profile) {
      $profile->settings = unserialize($profile->settings);
      $profiles[$profile->format] = $profile;
    }
  }

  return $profiles;
}

/**
 * Implements hook_form_FORM_ID_alter().
 */
function wysiwyg_form_user_profile_form_alter(&$form, &$form_state, $form_id) {
  $account = $form['#user'];
  $user_formats = filter_formats($account);
  $options = array();
  $options_default = array();
  foreach (wysiwyg_profile_load_all() as $format => $profile) {
    // Only show profiles that have user_choose enabled.
    if (!empty($profile->settings['user_choose']) && isset($user_formats[$format])) {
      $options[$format] = check_plain($user_formats[$format]->name);
      if (wysiwyg_user_get_status($profile, $account)) {
        $options_default[] = $format;
      }
    }
  }
  if (!empty($options)) {
    $form['wysiwyg']['wysiwyg_status'] = array(
      '#type' => 'checkboxes',
      '#title' => t('Text formats enabled for rich-text editing'),
      '#options' => $options,
      '#default_value' => $options_default,
    );
  }
}

/**
 * Implements hook_user_insert().
 *
 * Wysiwyg's user preferences are normally not exposed on the user registration
 * form, but in case they are manually altered in, we invoke
 * wysiwyg_user_update() accordingly.
 */
function wysiwyg_user_insert(&$edit, $account, $category) {
  wysiwyg_user_update($edit, $account, $category);
}

/**
 * Implements hook_user_update().
 */
function wysiwyg_user_update(&$edit, $account, $category) {
  if (isset($edit['wysiwyg_status'])) {
    db_delete('wysiwyg_user')
      ->condition('uid', $account->uid)
      ->execute();
    $query = db_insert('wysiwyg_user')
      ->fields(array('uid', 'format', 'status'));
    foreach ($edit['wysiwyg_status'] as $format => $status) {
      $query->values(array(
        'uid' => $account->uid,
        'format' => $format,
        'status' => (int) (bool) $status,
      ));
    }
    $query->execute();
  }
}

function wysiwyg_user_get_status($profile, $account = NULL) {
  global $user;

  if (!isset($account)) {
    $account = $user;
  }

  // Default wysiwyg editor status information is only required on forms, so we
  // do not pre-emptively load and attach this information on every user_load().
  if (!isset($account->wysiwyg_status)) {
    $account->wysiwyg_status = db_query("SELECT format, status FROM {wysiwyg_user} WHERE uid = :uid", array(
      ':uid' => $account->uid,
    ))->fetchAllKeyed();
  }

  if (!empty($profile->settings['user_choose']) && isset($account->wysiwyg_status[$profile->format])) {
    $status = $account->wysiwyg_status[$profile->format];
  }
  else {
    $status = isset($profile->settings['default']) ? $profile->settings['default'] : TRUE;
  }

  return (bool) $status;
}

/**
 * @defgroup wysiwyg_api Wysiwyg API
 * @{
 *
 * @todo Forked from Panels; abstract into a separate API module that allows
 *   contrib modules to define supported include/plugin types.
 */

/**
 * Return library information for a given editor.
 *
 * @param $name
 *   The internal name of an editor.
 *
 * @return
 *   The library information for the editor, or FALSE if $name is unknown or not
 *   installed properly.
 */
function wysiwyg_get_editor($name) {
  $editors = wysiwyg_get_all_editors();
  return isset($editors[$name]) && $editors[$name]['installed'] ? $editors[$name] : FALSE;
}

/**
 * Compile a list holding all supported editors including installed editor version information.
 */
function wysiwyg_get_all_editors() {
  static $editors;

  if (isset($editors)) {
    return $editors;
  }

  $editors = wysiwyg_load_includes('editors', 'editor');
  foreach ($editors as $editor => $properties) {
    // Fill in required properties.
    $editors[$editor] += array(
      'title' => '',
      'vendor url' => '',
      'download url' => '',
      'editor path' => wysiwyg_get_path($editors[$editor]['name']),
      'library path' => wysiwyg_get_path($editors[$editor]['name']),
      'libraries' => array(),
      'version callback' => NULL,
      'themes callback' => NULL,
      'settings callback' => NULL,
      'plugin callback' => NULL,
      'plugin settings callback' => NULL,
      'versions' => array(),
      'js path' => $editors[$editor]['path'] . '/js',
      'css path' => $editors[$editor]['path'] . '/css',
    );
    // Check whether library is present.
    if (!($editors[$editor]['installed'] = file_exists($editors[$editor]['library path']))) {
      continue;
    }
    // Detect library version.
    if (function_exists($editors[$editor]['version callback'])) {
      $editors[$editor]['installed version'] = $editors[$editor]['version callback']($editors[$editor]);
    }
    if (empty($editors[$editor]['installed version'])) {
      $editors[$editor]['error'] = t('The version of %editor could not be detected.', array('%editor' => $properties['title']));
      $editors[$editor]['installed'] = FALSE;
      continue;
    }
    // Determine to which supported version the installed version maps.
    ksort($editors[$editor]['versions']);
    $version = 0;
    foreach ($editors[$editor]['versions'] as $supported_version => $version_properties) {
      if (version_compare($editors[$editor]['installed version'], $supported_version, '>=')) {
        $version = $supported_version;
      }
    }
    if (!$version) {
      $editors[$editor]['error'] = t('The installed version %version of %editor is not supported.', array('%version' => $editors[$editor]['installed version'], '%editor' => $editors[$editor]['title']));
      $editors[$editor]['installed'] = FALSE;
      continue;
    }
    // Apply library version specific definitions and overrides.
    $editors[$editor] = array_merge($editors[$editor], $editors[$editor]['versions'][$version]);
    unset($editors[$editor]['versions']);
  }
  return $editors;
}

/**
 * Invoke hook_wysiwyg_plugin() in all modules.
 */
function wysiwyg_get_all_plugins() {
  static $plugins;

  if (isset($plugins)) {
    return $plugins;
  }

  $plugins = wysiwyg_load_includes('plugins', 'plugin');
  foreach ($plugins as $name => $properties) {
    $plugin = &$plugins[$name];
    // Fill in required/default properties.
    $plugin += array(
      'title' => $plugin['name'],
      'vendor url' => '',
      'js path' => $plugin['path'] . '/' . $plugin['name'],
      'js file' => $plugin['name'] . '.js',
      'css path' => $plugin['path'] . '/' . $plugin['name'],
      'css file' => $plugin['name'] . '.css',
      'icon path' => $plugin['path'] . '/' . $plugin['name'] . '/images',
      'icon file' => $plugin['name'] . '.png',
      'dialog path' => $plugin['name'],
      'dialog settings' => array(),
      'settings callback' => NULL,
      'settings form callback' => NULL,
    );
    // Fill in default settings.
    $plugin['settings'] += array(
      'path' => base_path() . $plugin['path'] . '/' . $plugin['name'],
    );
    // Check whether library is present.
    if (!($plugin['installed'] = file_exists($plugin['js path'] . '/' . $plugin['js file']))) {
      continue;
    }
  }
  return $plugins;
}

/**
 * Load include files for wysiwyg implemented by all modules.
 *
 * @param $type
 *   The type of includes to search for, can be 'editors'.
 * @param $hook
 *   The hook name to invoke.
 * @param $file
 *   An optional include file name without .inc extension to limit the search to.
 *
 * @see wysiwyg_get_directories(), _wysiwyg_process_include()
 */
function wysiwyg_load_includes($type = 'editors', $hook = 'editor', $file = NULL) {
  // Determine implementations.
  $directories = wysiwyg_get_directories($type);
  $directories['wysiwyg'] = drupal_get_path('module', 'wysiwyg') . '/' . $type;
  $file_list = array();
  foreach ($directories as $module => $path) {
    $file_list[$module] = drupal_system_listing("/{$file}.inc\$/", $path, 'name', 0);
  }

  // Load implementations.
  $info = array();
  foreach (array_filter($file_list) as $module => $files) {
    foreach ($files as $file) {
      include_once './' . $file->uri;
      $result = _wysiwyg_process_include($module, $module . '_' . $file->name, dirname($file->uri), $hook);
      if (is_array($result)) {
        $info = array_merge($info, $result);
      }
    }
  }
  return $info;
}

/**
 * Helper function to build paths to libraries.
 *
 * @param $library
 *   The external library name to return the path for.
 * @param $base_path
 *   Whether to prefix the resulting path with base_path().
 *
 * @return
 *   The path to the specified library.
 *
 * @ingroup libraries
 */
function wysiwyg_get_path($library, $base_path = FALSE) {
  static $libraries;

  if (!isset($libraries)) {
    $libraries = wysiwyg_get_libraries();
  }
  if (!isset($libraries[$library])) {
    // Most often, external libraries can be shared across multiple sites.
    return 'sites/all/libraries/' . $library;
  }

  $path = ($base_path ? base_path() : '');
  $path .= $libraries[$library];

  return $path;
}

/**
 * Return an array of library directories.
 *
 * Returns an array of library directories from the all-sites directory
 * (i.e. sites/all/libraries/), the profiles directory, and site-specific
 * directory (i.e. sites/somesite/libraries/). The returned array will be keyed
 * by the library name. Site-specific libraries are prioritized over libraries
 * in the default directories. That is, if a library with the same name appears
 * in both the site-wide directory and site-specific directory, only the
 * site-specific version will be listed.
 *
 * @return
 *   A list of library directories.
 *
 * @ingroup libraries
 */
function wysiwyg_get_libraries() {
  global $profile;

  // When this function is called during Drupal's initial installation process,
  // the name of the profile that is about to be installed is stored in the
  // global $profile variable. At all other times, the regular system variable
  // contains the name of the current profile, and we can call variable_get()
  // to determine the profile.
  if (!isset($profile)) {
    $profile = variable_get('install_profile', 'default');
  }

  $directory = 'libraries';
  $searchdir = array();
  $config = conf_path();

  // The 'profiles' directory contains pristine collections of modules and
  // themes as organized by a distribution.  It is pristine in the same way
  // that /modules is pristine for core; users should avoid changing anything
  // there in favor of sites/all or sites/<domain> directories.
  if (file_exists("profiles/$profile/$directory")) {
    $searchdir[] = "profiles/$profile/$directory";
  }

  // Always search sites/all/*.
  $searchdir[] = 'sites/all/' . $directory;

  // Also search sites/<domain>/*.
  if (file_exists("$config/$directory")) {
    $searchdir[] = "$config/$directory";
  }

  // Retrieve list of directories.
  // @todo Core: Allow to scan for directories.
  $directories = array();
  $nomask = array('CVS');
  foreach ($searchdir as $dir) {
    if (is_dir($dir) && $handle = opendir($dir)) {
      while (FALSE !== ($file = readdir($handle))) {
        if (!in_array($file, $nomask) && $file[0] != '.') {
          if (is_dir("$dir/$file")) {
            $directories[$file] = "$dir/$file";
          }
        }
      }
      closedir($handle);
    }
  }

  return $directories;
}

/**
 * Return a list of directories by modules implementing wysiwyg_include_directory().
 *
 * @param $plugintype
 *   The type of a plugin; can be 'editors'.
 *
 * @return
 *   An array containing module names suffixed with '_' and their defined
 *   directory.
 *
 * @see wysiwyg_load_includes(), _wysiwyg_process_include()
 */
function wysiwyg_get_directories($plugintype) {
  $directories = array();
  foreach (module_implements('wysiwyg_include_directory') as $module) {
    $result = module_invoke($module, 'wysiwyg_include_directory', $plugintype);
    if (isset($result) && is_string($result)) {
      $directories[$module] = drupal_get_path('module', $module) . '/' . $result;
    }
  }
  return $directories;
}

/**
 * Process a single hook implementation of a wysiwyg editor.
 *
 * @param $module
 *   The module that owns the hook.
 * @param $identifier
 *   Either the module or 'wysiwyg_' . $file->name
 * @param $hook
 *   The name of the hook being invoked.
 */
function _wysiwyg_process_include($module, $identifier, $path, $hook) {
  $function = $identifier . '_' . $hook;
  if (!function_exists($function)) {
    return NULL;
  }
  $result = $function();
  if (!isset($result) || !is_array($result)) {
    return NULL;
  }

  // Fill in defaults.
  foreach ($result as $editor => $properties) {
    $result[$editor]['module'] = $module;
    $result[$editor]['name'] = $editor;
    $result[$editor]['path'] = $path;
  }
  return $result;
}

/**
 * @} End of "defgroup wysiwyg_api".
 */

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