Corey Salzano

I replicated wordpress.org’s code reference system for my own project.

WordPress provides a template tag get_the_title() and it’s documented at https://developer.wordpress.org/reference/functions/get_the_title/.

A plugin I just launched provides a template tag invp_get_the_price() and it’s documented at https://inventorypresser.com/docs/reference/functions/invp_get_the_price/

I learned that the .org docs page content is generated by scanning the project source code, extracting PHPDoc comments, and parsing them into custom post types. The piece of software that does that is https://github.com/WordPress/phpdoc-parser.

Build the Data

1. Add PHPDoc comments to all classes and methods in your plugin.
2. Use a server that provides the WordPress Command Line Interface.
3. Upload your plugin to the site where you want to generate documentation.
4. Activate the phpdoc-parser plugin on the same site
5. Connect via SSH and run a wp-cli command similar to wp parser create ../../sites/inventorypress/wp-content/plugins/inventory-presser/ --user=corey
   1. Replace the path with a path to the plugin for which you want documentation.
   2. Change the user name to the name of an administrator on your site.

Build the Theme

WordPress.org uses a handful of themes at once. The developer reference pieces live in the wporg-developer theme.

Take Files from wporg-developer

SIDE NOTE: I would like to include wporg-developer in my theme or child theme instead of copying files, but step 2 below makes it hard to use wporg-developer as a dependency. It must be edited. I would enjoy having easy access to updates, and perhaps I could contribute to the theme to add necessary filters someday in the future.

How to download wordpress.org source code

This SVN command will download the whole theme. Paste the command into a terminal or command prompt window:

svn co https://meta.svn.wordpress.org/sites/trunk/wordpress.org/public_html/wp-content/themes/pub/wporg-developer/

Copy these files from wporg-developer into your child theme

• /inc
• /js
• /reference
• /stylesheets
• content-reference.php
• content-reference-archive.php
• functions.php (comingle it with your functions.php)

Theme Mods

1. Change option value wp_parser_root_import_dir to contain a path to the project. For me, this path points to a plugin in the wp-content/plugins folder.
2. Change get_template_directory_uri() calls to get_stylesheet_directory_uri() calls
3. Create single.php by taking a copy from the parent theme. Modify it to serve a different content template for the post types populated by phpdoc-parser. Here is a code sample that shows what to change to create a Twenty Twenty-One child theme.
4. Optional: Change “View on Trac” links
   I added two filters that wrap the URL and the text in the “View on Trac” link below the source code section of each page. These changes allow me to change the links to “View on Github” or wherever I want.
   1. wp-parser_source_url_base line 1173 of template-tags.php
   2. wp-parser_view_on_trac_link_text in a few places in template-source.php

Twenty Twenty-One Child Theme

Download a Twenty Twenty-One child theme with the files listed and mods 1-3 completed: https://github.com/csalzano/twentytwentyone-wporg-child

Also Run This Plugin

SyntaxHighlighter Evolved styles the source code editors.

Troubleshooting

Missing Source Code

If no source code is displaying, edit the option wp_parser_root_import_dir to contain a full path to the directory of the plugin. Example: /corey/sites/inventorypress/wp-content/plugins/inventory-presser

My Observations So Far

1. I love it, but I didn’t try anything else. Writing code comments is now also writing web pages and a great motivator to do it right.
2. Done! See Add-on Plugins phpdoc-parser reruns do not delete items. I need to write code that deletes functions, methods, hooks, and classes that are removed from the project.
3. Done! See Automating Updates to Docs I want to write a Github action to automate wp-parser runs on new versions of the plugin. When I push updates to the public repo, a copy of the plugin is written to the webserver, and wp-parser is run to generate new docs.

Automating Updates to Docs

Four months after I published this post, I designed a Github Action to automate the creation and updating of the docs pages. When I push to the master branch of my plugin’s repo, the plugin is deployed to the site on WP Engine where the docs pages are hosted, and the wp-cli command that generates the docs is run.

Here is the workflow file that defines the Action at Github: https://github.com/fridaysystems/inventory-presser/blob/master/.github/workflows/main.yml

It contains one job with two steps that are marked with these comments:

• # Deploy to WP Engine
• # Run phpdoc-parser to Build Documentation

Add-on Plugins

I wrote two add-on plugins to modify the behavior of phpdoc-parser.

1. phpdoc-ignorer instructs phpdoc-parser to ignore the /vendor folder in my plugin
2. phpdoc-deleter keeps track of every post created or updated by phpdoc-parser. After the run is complete, it deletes all posts that were not touched and then empty taxonomy terms.

I built a WordPress plugin that saves a copy of all Gravity Forms entries in a Google Sheet as they are received. Entries to Google Sheet is the glue between a Gravity Form and a Google Sheet.

https://entriestogooglesheet.com

This is confusing: calls to get_fields() find no Advanced Custom Fields values saved with a specific post, but calls to get_field() find values for the same post.

This happens when ACF did not insert the field values, and the secondary value with the meta_key beginning with an underscore does not exist.

The post has the values, but the Advanced Custom Fields plugin expects an additional value in a hidden field for each field.

ACF Creates a Second Key Value Pair

1. my_custom_value
2. _my_custom_value (this one is missing)

• Migrate Specific Posts or Attachments With a Third WordPress Install
• Duplicate the Site and Delete Posts That Won’t Move
• The Built-in Tools > Export Feature Preserves Post IDs

An easy way to move WordPress content from one site to another is with the built-in XML import and export scripts located under the Tools menu. This tool does not allow users to export only specific posts, attachments, or other content. If you want Posts and Media, you get them all. Here is how I worked around this limitation to migrate 700 specific attachments among thousands.

Use a Third WordPress Install

I duplicated the site to a third, throwaway instance of WordPress using exfil, deleted the attachments I was not interested in (so only the attachments I wanted to move remained), and exported all Media with Tools > Export. 

The Hard Part is Deleting All The Posts That Won’t Move

Deleting a few thousand attachments from WordPress is not fast using PHP. Like me, you might imagine writing a small loop with a call to wp_delete_attachment() inside. This is painful, and I do not recommend. (My local Laravel Valet development environment skid to a stop, and after many valet restart to rescue my local server, I decided to move on.)

I probably could have used a database query like DELETE FROM wp_posts WHERE ID NOT IN ( 32281, 32279, ... ), but I opted for the assistance of wp-cli, the WordPress Command Line Interface. This giant command to delete attachments by providing all of their IDs works great and finishes in under one minute:

wp post delete 32281 32279 32263 32258 32248 32247 32241 32239 32238 32230 32222 32195 32152 32151 32150 32131 32130 32129 32102 32067 32066 32060 32059 32058 32057 32052 31977 31957 31954 31953 31919 31918 31889 31875 31868 31864 31863 31859 31843 31839 31838 31837 31836 31835 31817 31816 31815 31814 31813 31812 31810 31801 31799 31798 31777 31776 31775 31774 31764 31763 31751 31731 31730 31726 31725 31721 31720 31719 31714 31707 31706 31681 24802 31646 31631 31623 31612 31605 31603 31584 31578 31572 31571 31552 31544 31541 31531 31501 31498 31497 31480 31441 31439 31397 31395 31391 31390 31389 31388 31323 31322 31316 31289 31287 31249 31237 31236 31224 31222 31206 31183 31175 31172 31170 31168 31161 31160 31158 31156 31148 31120 31107 31098 31097 31096 31073 31037 31036 31035 31029 31033 31032 31031 31030 31026 31025 31024 31007 31003 30992 30991 30935 30930 30928 30925 30924 30918 30917 30913 30912 30911 30909 30907 30899 30880 30781 30756 30743 30742 30731 30674 30673 30643 30634 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381 382 372 271 268 265 223 210 194 189 --force

The --force argument skips Trash and permanently deletes.

What Gave Birth to That Hideous Command

I wrote a bit of PHP to find the post IDs of attachments I wanted to migrate, and used the exclude argument in a get_posts() call to find the post IDs of all other attachments in the site. Then, I built the above wp-cli command in a string, and wrote it to a text file.

After deleting all the posts that should not be migrated, I was then ready to run Tools > Export for Media. The resulting XML file only contains attachments that remain after the massive deletion. The file also has URLs containing .test domains for my local environment, so I replaced those with the production domain. These URL changes mean the attachments will be pulled from the production site, not my local copy that’s only accessible from on my computer.

Provide the XML file to the WordPress importer at Tools > Import. Some servers will kill PHP processes that run longer than a specific amount of time. It’s OK to re-run the Import until it finishes. Because post IDs are preserved, no duplicate posts will result from running an XML import more than once.

I have written and released a bash script that extracts WordPress websites and updates their local copies in my computer. It’s called exfil, it’s free and open-source, and lives on Github at https://github.com/csalzano/exfil/.

To celebrate it’s release, I demoed exfil at the August 2020 burbswp.com virtual meetup, “What I’ve Learned Since Lockdowns Started”.

I plan to use this script for years because it saves time and is already better than the migration plugin I was using previously. Let me know if you try it or have a better script I could learn from.

Out of the box, The Events Calendar plugin for WordPress is amazing and a pleasure to work with as a developer. However, it does not show users Media Library uploads that are attached to event posts.

I made a plugin to bring this functionality to the Single Event view, it’s free and open-source, and you can download it here: https://github.com/csalzano/the-events-calendar-show-attachments

As of this writing, it is not possible to delete a meta value using the WordPress REST API. Post meta updates must be communicated while inserting and updating post objects, and the only way to “remove” meta fields is to write blank values over their current values.

I wrote a free and open-source plugin to provide granular control over post and term meta fields. It lives on Github. The plugin is called Manipulate Meta with the WP API, and it extends the REST API to allow one request to retrieve, update, or delete a meta field independently from a post or term object.

The instructions are located in the repo’s README.md.