akirk / extract-wp-hooks

A script to extract available WordPress hooks for a Github Wiki

extract-hooks

This script is intended for WordPress plugins that provide hooks that can be used by other plugins. By parsing its source code, it creates a documentation in a Github wiki.

Typically, you'd first create a extract-wp-hooks.json, and check out the Github wiki in a folder above the repo. Modify the extract-wp-hooks.json accordingly and execute extract-wp-hooks.php. This will create markdown files in the wiki folder. You can then git commit and git push the changes.

Examples

• https://github.com/akirk/extract-hooks/wiki/Hooks (extracted from example.php)
• https://github.com/akirk/friends/wiki/Hooks
• https://github.com/akirk/enable-mastodon-apps/wiki/Hooks

How it works

The PHP script doesn't have any dependencies. It uses PHP's internal parser (using token_get_all) to identify PHP function calls to apply_filters() or do_action().

It generates a markdown file for each filter which is suitable for a Github wiki. The page contains potentially provided documentation (via a comment in the source code), an (auto-generated) example, parameters, return value, references to the source code (including extracted source snippet).

Example: Provide Documentation Via a Comment

For each filter, it looks at the comment preceeding the filter, so that you can document it, for example:

/*
 * This is example filter 1.
 *
 * @param string $text The text to modify.
 * @param string $mode Extra information that might be useful.
 * @return string The modified text.
 */
$result = apply_filters( 'example_filter1', $text, $mode );

This will generate an example_filter1.md that contains the text This is an example filter and a list of parameters and return value:

example_filter1

This is an example filter.

Parameters

• string $text The text to modify.
• string $mode Extra information that might be useful.

Returns

string The modified text.

But not only that, it will contain an auto-generated example:

Auto-generated Example

add_filter(
    'example_filter1',
    function(
        string $text,
        string $mode
    ) {
        // Your code
        return $text;
    },
    10,
    2
);

Provide an Example

You can also provide your own example in the comment, that will override the auto-generated example:

/*
 * This is example filter 2.
 *
 * Example:
 * ```php
 * add_filter( 'example_filter2', function ( $text ) {
 *     return strtolower( $text );
 * } );
 * ```
 *
 * @param string $text The text to modify.
 * @param string $mode Extra information that might be useful.
 * @return string The modified text.
 */
$result = apply_filters( 'example_filter2', $text, $mode );

It generates this output: example_filter2

Example

add_filter( 'example_filter2', function ( $text ) {
    return strtolower( $text );
} );

No Documentation

Finally, if you have an filter without any documentation, the script attempts to create a useful auto-generated example. So suppose you have code

$result = apply_filters( 'example_filter3', $text, $mode );

It generates this output: example_filter3

Auto-generated Example

add_filter(
    'example_filter3',
    function (
        $text,
        $mode
    ) {
        // Your code here
        return $text;
    },
    10,
    2
);

Parameters

• $text
• $mode

Install

Via composer:

composer require --dev akirk/extract-wp-hooks

You will then be able to run extract-wp-hooks.php from the vendor bin directory:

./vendor/bin/extract-wp-hooks.php

Place a .extract-wp-hooks.json or extract-wp-hooks.json in your project directory to use it.