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<?php

/**

 * @file

 * Hooks provided by the Variable module.

 */

/**

 * @defgroup variable_api_hooks Variable API Hooks

 * @{

 * Functions to define and modify information about variables.

 *

 * These hooks and all the related callbacks may be defined in a separate file

 * named module.variable.inc

 *

 * @}

 */

/**

 * Define variables used by a module.

 *

 * Provides meta-information for each variable that includes at the very least some human readable title.

 * This information may be used by other modules to select variables from a list for translating, exporting, etc.

 *

 * Though not required we can also provide some more information to be able to handle the variable in an effective

 * way, like which type of data and form element it uses, default value, etc.. There are multiple predefined

 * variable types ('type' attribute) that will add a predefined set of properties. Some of them are:

 *

 * - "string": Simple plain string variable. The form element will be a text field and it will be localizable.

 * - "number": Simple numeric value. The form element will be a text field.

 * - "boolean": Simple TRUE/FALSE value. It will be a checkbox.

 * - "enable": Enabled / Disabled selector. It will display as two radio buttons.

 * - "select": Selectable list of options. Depending on the number of options, the element will be a list of

 *   radios or a drop down.

 * - "options": List of options with multiple choices. It will be a list of checkboxes.

 * ...

 *

 * More variable types can be defined by modules using hook_variable_type_info().

 *

 * For the case of variable names that depend on some other parameter (like variables per content-type),

 * there's some special type of variables: Multiple variables. These can be defined like this:

 *

 * @code

 *   $variables['node_options_[node_type]'] = array(

 *     'type' => 'multiple',

 *     'title' => t('Default options', array(), $options),

 *     'repeat' => array(

 *       'type' => 'options',

 *       'default' => array('status', 'promote'),

 *       'options callback' => 'node_variable_option_list',

 *     ),

 *   );

 * @endcode

 *

 * This multiple variable will spawn into one variable for each node type. Note the variable name that includes

 * the property [node_type]. Values for [node_type] will be defined on hook_variable_type_info().

 *

 * The 'repeat' property defines the properties of children variables. In this case the 'type' property is optional

 * and will default to 'multiple'.

 *

 * @param $options

 *   Array of options to build variable properties. Since variable properties are cached per language

 *   these options should be used at the very least for string translations, so titles and defaults are

 *   localized. Possible options:

 *   - "language" => Language object for which strings and defaults must be returned. This one will be always defined.

 *

 * @return

 *   An array of information defining the module's variables. The array

 *   contains a sub-array for each node variable, with the variable name

 *   as the key. Possible attributes:

 *   - "title": The human readable name of the variable, will be used in auto generated forms.

 *   - "type": Variable type, should be one of the defined on hook_variable_type_info().

 *   - "group": Group key, should be one of the defined on hook_variable_group_info().

 *   - "description": Variable description, will be used in auto generated forms.

 *   - "options": Array of selectable options, or option name as defined on hook_variable_option_info().

 *   - "options callback": Function to invoke to get the list of options.

 *   - "default": Default value.

 *   - "default callback": Function to invoke to get the default value.

 *   - "multiple": Array of multiple children variables to be created from this one.

 *   - "multiple callback": Function to invoke to get children variables.

 *   - "element": Form element properties to override the default ones for this variable type.

 *   - "element callback": Function to invoke to get a form element for this variable.

 *   - "module": Module to which this variable belongs. This property will be added automatically.

 *   - "repeat": Array of variable properties for children variables.

 *   - "localize": Boolean value, TRUE for variables that should be localized. This may be used by other modules.

 *   - "validate callback": Callback to validate the variable value, it will be added to form element #validate.

 *

 * @see hook_variable_info_alter()

 */

function hook_variable_info($options) {

  $variables['site_name'] = array(

    'type' => 'string',

    'title' => t('Name', array(), $options),

    'default' => 'Drupal',

    'description' => t('The name of this website.', array(), $options),

    'required' => TRUE,

  );

  $variables['site_403'] = array(

    'type' => 'drupal_path',

    'title' => t('Default 403 (access denied) page', array(), $options),

    'default' => '',

    'description' => t('This page is displayed when the requested document is denied to the current user. Leave blank to display a generic "access denied" page.', array(), $options),

  );

  return $variables;

}

/**

 * Alter the variable definitions.

 *

 * @param $info

 *   The variable info array, keyed by variable name.

 *

 * @see hook_variable_info()

 */

function hook_variable_info_alter(&$info) {

}

/**

 * Define types of variables or list of values used by a module.

 *

 * These subtypes can be used to provide defaults for all properties of variables of this type

 * or to provide a list of options either for variable options (selectable values) or for children

 * variables in the case of multiple variables.

 *

 * Example, three usages of variable type:

 * @code

 *   // Use variable type 'weekday' to provide a selector for a day of the week

 *   $variables['date_first_day'] = array(

 *            'type' => 'weekday',

 *            'title' => t('First day of week'),

 *            'default' => 0,

 *          );

 *

 *   // Use 'options' with value 'weekday' for any other variable that needs to provide a selectable

 *   // list of days of the week. In this example you can select one or more days.

 *   $variables['working_days'] = array(

 *           'type' => 'options',

 *    'options' => 'weekday',

 *    'title' => t('Select working days from the list.'),

 *   );

 *

 *   // Use 'multiple' with value 'weekday' to create a subset of variables, one for each day of the week.

 *   // In fact, using '[weekday]' in the variable name will set these properties ('type' and 'multiple') automatically.

 *          $variables['daily_greeting_[weekday]'] = array(

 *      'type' => 'multiple',

 *                         'multiple' => 'weekday',

 *      'repeat' => array('type' => 'string'),

 *      'title' => t('Greeting to display each day of the week'),

 *          );

 * @endcode

 *

 * @return

 *   An array of information defining variable types. The array contains

 *   a sub-array for each variable type, with the variable type as the key.

 *

 *   The possible attributes are the same as for hook_variable_info(), with the

 *   type attributes being added on top of the variable attributes.

 *

 *   A special attribute:

 *   - "type": Variable subtype, the properties for the subtype will be added to these ones.

 *

 * @see hook_variable_type_info_alter()

 */

function hook_variable_type_info() {

  $type['mail_address'] = array(

    'title' => t('E-mail address'),

    'element' => array('#type' => 'textfield'),

    'token' => TRUE,

  );

  $type['mail_text'] = array(

    'title' => t('Mail text'),

    'multiple' => array('subject' => t('Subject'), 'body' => t('Body')),

    'build callback' => 'variable_build_mail_text',

    'localize' => TRUE,

    'type' => 'multiple',

  );

  return $type;

}

/**

 * Alter the variable type definitions.

 *

 * @param $info

 *   The variable type info array, keyed by variable type name.

 *

 * @see hook_variable_type_info()

 */

function hook_variable_type_info_alter(&$info) {

}

/**

 * Define groups of variables used by a module.

 *

 * Variable groups are used for presentation only, to display and edit the variables

 * on manageable groups. Groups can define a subset of a module's variables and can

 * be reused accross modules to group related variables.

 *

 * A form to edit all variables in a group can be generated with:

 *

 *   drupal_get_form('variable_group_form', group_name);

 *

 * @return

 *   An array of information defining variable types. The array contains

 *   a sub-array for each variable group, with the group as the key.

 *   Possible attributes:

 *   - "title": The human readable name of the group. Must be localized.

 *   - "description": The human readable description of the group. Must be localized.

 *   - "access": Permission required to edit group's variables. Will default to 'administer site configuration'.

 *   - "path": Array of administration paths where these variables can be accessed.

 *

 * @see hook_variable_group_info_alter()

 */

function hook_variable_group_info() {

  $groups['system_site_information'] = array(

    'title' => t('Site information'),

    'description' => t('Site information and maintenance mode'),

    'access' => 'administer site configuration',

    'path' => array('admin/config/system/site-information', 'admin/config/development/maintenance'),

  );

  $groups['system_feed_settings'] = array(

    'title' => t('Feed settings'),

    'description' => t('Feed settings'),

    'access' => 'administer site configuration',

  );

  return $groups;

}

/**

 * Alter the variable group definitions.

 *

 * @param $info

 *   The variable type info array, keyed by variable group name.

 *

 * @see hook_variable_group_info()

 */

function hook_variable_group_info_alter(&$info) {

}

/**

 * Alter system settings forms.

 *

 * This is a special version of hook_form_alter() that is triggered only for

 * system settings forms, and only after any other module has added/removed

 * variables using hook_form_alter().

 *

 * It is used to mark / replace special realm variables that are contained in the form.

 *

 * @see hook_form_alter()

 * @see variable_module_implements_alter()

 */

function hook_variable_settings_form_alter(&$form, &$form_state, $form_id) {

}