Drupal example source code file (API.txt)
The API.txt Drupal example source code
$Id: API.txt,v 188.8.131.52 2010/08/09 19:00:03 davereid Exp $ This document explains how to provide "Pathauto integration" in a module. You need this if you would like to provide additional tokens or if your module has paths and you wish to have them automatically aliased. The simplest integration is just to provide tokens so we cover that first. More advanced integration requires an implementation of hook_pathauto to provide a settings form. It may be helpful to review some examples of integration from the pathauto_node.inc, pathauto_taxonomy.inc, and pathauto_user.inc files. ================== 1 - Providing additional tokens ================== If all you want is to enable tokens for your module you will simply need to implement two functions: hook_token_values hook_token_list See the token.module and it's API.txt for more information about this process. If the token is intended to generate a path expected to contain slashes, the token name must end in 'path', 'path-raw' or 'alias'. This indicates to Pathauto that the slashes should not be removed from the replacement value. When an object is created (whether it is a node or a user or a taxonomy term) the data that Pathauto hands to the token_values in the $object is in a specific format. This is the format that most people write code to handle. However, during edits and bulk updates the data may be in a totally different format. So, if you are writing a hook_token_values implementation to add special tokens, be sure to test creation, edit, and bulk update cases to make sure your code will handle it. ================== 2 - Settings hook - To create aliases for your module ================== You must implement hook_pathauto($op), where $op is always (at this time) 'settings'. Return an object (NOT an array) containing the following members, which will be used by pathauto to build a group of settings for your module and define the variables for saving your settings: module - The name of your module (e.g., 'node') groupheader - The translated label for the settings group (e.g., t('Node path settings') patterndescr - The translated label for the default pattern (e.g., t('Default path pattern (applies to all node types with blank patterns below)') patterndefault - A translated default pattern (e.g., t('[cat]/[title].html')) placeholders - An array whose keys consist of the translated placeholders which will appear in patterns (e.g., t('[title]')) and values are the translated description of the placeholders (e.g., t('The title of the node, with spaces and punctuation.') patternitems - For modules which need to express multiple patterns (for example, the node module supports a separate pattern for each node type), an array whose keys consist of identifiers for each pattern (e.g., the node type name) and values consist of the translated label for the pattern supportsfeeds - Modules which support RSS feeds should set this to the string that's appended to a path for its feed (usually 'feed') , so when administrators enable "Create feed aliases" an alias for this content type's feed will be generated in addition to the base alias. bulkname - For modules which support a bulk update operation, the translated label for the action (e.g., t('Bulk update node paths')) bulkdescr - For modules which support a bulk update operation, a translated, more thorough description of what the operation will do (e.g., t('Generate aliases for all existing nodes which do not already have aliases.')) ================== 2 - $alias = pathauto_create_alias($module, $op, $placeholders, $src, $type=NULL) ================== At the appropriate time (usually when a new item is being created for which a generated alias is desired), call pathauto_create_alias() to generate and create the alias. See the user, taxonomy, and nodeapi hook implementations in pathauto.module for examples. $module - The name of your module (e.g., 'node') $op - Operation being performed on the item ('insert', 'update', or 'bulkupdate') $placeholders - An array whose keys consist of the translated placeholders which appear in patterns and values are the "clean" values to be substituted into the pattern. Call pathauto_cleanstring() on any values which you do not know to be purely alphanumeric, to substitute any non-alphanumerics with the user's designated separator. Note that if the pattern has multiple slash-separated components (e.g., [catpath]), pathauto_cleanstring() should be called for each component, not the complete string. Example: $placeholders[t('[title]')] = pathauto_cleanstring($node->title); $src - The "real" URI of the content to be aliased (e.g., "node/$node->nid") $type - For modules which provided patternitems in hook_autopath(), the relevant identifier for the specific item to be aliased (e.g., $node->type) pathauto_create_alias() returns the alias that was created. ================== 3 - Bulk update function ================== If a module supports bulk updating of aliases, it must provide a function of this form, to be called by pathauto when the corresponding checkbox is selected and the settings page submitted: function <module>_pathauto_bulkupdate() The function should iterate over the content items controlled by the module, calling pathauto_create_alias() for each one. It is recommended that the function report on its success (e.g., with a count of created aliases) via drupal_set_message(). ================== 4 - Bulk delete hook_path_alias_types() ================== For modules that create new types of pages that can be aliased with pathauto, a hook implementation is needed to allow the user to delete them all at once. function hook_path_alias_types() This hook returns an array whose keys match the beginning of the source paths (e.g.: "node/", "user/", etc.) and whose values describe the type of page (e.g.: "content", "users"). Like all displayed strings, these descriptionsshould be localized with t(). Use % to match interior pieces of a path; "user/%/track". This is a database wildcard, so be careful. ================== Modules that extend node and/or taxonomy ================== NOTE: this is basically not true any more. If you feel you need this file an issue. Many contributed Drupal modules extend the core node and taxonomy modules. To extend pathauto patterns to support their extensions, they may implement the pathauto_node and pathauto_taxonomy hooks. To do so, implement the function <modulename>_pathauto_node (or _taxonomy), accepting the arguments $op and $node (or $term). Two operations are supported: $op = 'placeholders' - return an array keyed on placeholder strings (e.g., t('[eventyyyy]')) valued with descriptions (e.g. t('The year the event starts.')). $op = 'values' - return an array keyed on placeholder strings, valued with the "clean" actual value for the passed node or category (e.g., pathauto_cleanstring(date('M', $eventstart))); See contrib/pathauto_node_event.inc for an example of extending node patterns.
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