Make WP-CLI Work For You

Extending WP-CLI With Custom Commands

https://chriswiegman.com/slides/wcchi16

Chris Wiegman / @chris

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What is WP-CLI?

WP-CLI is a PHP script that interacts with WordPress from the command line (Unix).

WP-CLI works on your server (or local dev environment). It is not necessarily part of WordPress itself.

WP-CLI lets you work with nearly all parts of WordPress, content, users, settings, plugins, etc.

WP-CLI has a simple API which makes it easily and infinitely extensible.

Why Extend WP-CLI?

By default WP-CLI only works with WordPress' core functionality. Extending WP-CLI lets you work with:

• Plugins
• Themes
• Other (non WordPress) Software

What Can a command do?

• Write to a log
• Enable/Disable options
• Write to other software
• Interact with an API
• Manage cache
• Handle security functions
• ALL THE THINGS!

Some Examples:

• Perform an index of the site with Elasticsearch/ElasticPress
• Create Munin and Monit plugins
• Clear iThemes Security logs and lockouts
• Compare a screenshot of a staging site to production
• Disable/handicap a user via Fail2ban
• Offload heavy tasks

Writing a new command

Each Command Must be Registered

				WP_CLI::add_command( 'hello', 'Hello_World_Command' );
			

A command is a simple class

				class Hello_World_Command extends WP_CLI_Command {

				public function __invoke() {

				WP_CLI::success( 'Hello World' );

				}

				}
			

$ wp hello

But... What about options?

				class Hello_World_Command extends WP_CLI_Command {

				/**
				* An improved Hello World
				*
				* @synopsis [<NAME>] [--name=<NAME>]
				*/
				public function __invoke( $args, $assoc_args) {

				$name = 'World';

				if ( isset( $args[0] ) || isset( $assoc_args['name'] ) ) {
				$name = isset( $args[0] ) ? $args[0] : $assoc_args['name'];
				}

				WP_CLI::success( 'Hello ' . sanitize_text_field( $name );

				}

				}
			

$ wp hello Chris

or

$ wp hello --name=Chris

A subcommand can expand it

				class Hello_World_Command extends WP_CLI_Command {

				public function world() {

				WP_CLI::success( 'Hello World' );

				}

				/**
				* An improved Hello World
				*
				* @synopsis <NAME>
				*/
				public function name( $args, $assoc_args) {

				WP_CLI::success( 'Hello ' . sanitize_text_field( $args[0] );

				}

				}

			

$ wp hello world

or

$ wp hello name Chris

Custom Command Tips

Don't Automatically Register Commands

				if ( defined( 'WP_CLI' ) && WP_CLI ) {
				WP_CLI::add_command( 'hello', 'Hello_World_Command' );
				}
			

Success and Failure are Not Treated Equal

WP_CLI::success( 'You Did Good' );

WP_CLI::error( "You Failed. I'm done" );

WP_CLI::error will, if called like success, terminate the script. Success will just go on

You can set the 2nd param, exit, to false on WP_CLI::error to continue execution

WP_CLI::error( "You Failed, but I'll keep going anyway.", false );

Use the Formatter

You can automattically output data in various formats:

• JSON
• Table
• csv
• IDs
• count

WP_CLI\Utils\format_items( 'json', get_users(), array( 'ID', 'user_login' ) );

WP_CLI\Utils\format_items( 'table', get_users(), array( 'ID', 'user_login' )
				);

It can do a Progress Bar too!

$notify = \WP_CLI\Utils\make_progress_bar( 'Generating posts', $current_post_count
				);

$notify->tick();

$notify->finish();

Use The Force Utils

Various [not well documented] utility function in php/utils.php

• locate_wp_config()
• write_csv( $fd, $rows, $headers = array() )
• launch_editor_for_input( $input, $title = 'WP-CLI' )
• parse_url( $url )
• is_windows()

We don't need no stinkin plugin

The path variable lets you execute a command from anywhere

Target file only needs the command registration and location of command class (require statement)

One command repo on the server/environment/etc can execute commands for all sites

Questions?

Thank You

https://chriswiegman.com/slides/wcchi16

Chris Wiegman / @chris