README

WP CLI PSR Logger

A PSR logger which calls WP_CLI::line() with the level name coloured.

Allows easy separation of logic and presentation for CLI commands. I.e. no intermingling of WP_CLI::line() in main application code.

Install

composer require brianhenryie/bh-wp-cli-logger

Operation

$logger = new \BrianHenryIE\WP_CLI_Logger\WP_CLI_Logger();
$logger->warning( 'Something happened!' );

• It is just a PSR Logger Interface implementation (aka a PSR-3 logger)
• It does not filter logs to above a certain level
• It does not record the logs anywhere

There is one filter for customising the output:

/**
 * Filter logs to control output style.
 *
 * NB: try to use the `context` to only apply this filter to logs output by your own plugin.
 * Return null, an empty array, or an empty message to prevent output.
 *
 * @var ?array{level:string, message:string, context:array<mixed>, prepend:string, ansi_color:string} $log
 */
$log = apply_filters( 'bh_wp_cli_logger_log', $log );

Try it out

composer install
npm install

npx wp-env start

npx wp-env run cli wp cli-logger

NAME

  wp cli-logger

DESCRIPTION

  Test the WP_CLI PSR logger.

SYNOPSIS

  wp cli-logger [<levels>...] [--message=<message>]

  [<levels>...]
    Optional list of log levels to show.

  [--message=<message>]
    A message to use in the output. Replaces `{level}` in the template if present.
    ---
    default: "This is a {level} log message."
    ---

EXAMPLES

     # Print out a log message for notice
     $ wp test-plugin notice
     Notice:  This is a notice log message.

     # Print out a custom log message for warning
     $ wp test-plugin warning --message="Uh, oh... something looks amiss."
     Warning: Uh, oh... something looks amiss.

     # Print out a log messages for two levels
     $ wp test-plugin notice debug
     Notice:  This is a notice log message.
     Debug:   This is a debug log message.

Delete the Docker containers afterwards:

npx wp-env destroy

Rationale

Error: red, warning: yellow, and notice: blue are the standard WordPress admin_notice colours.

Debug: blue is the standard WP_CLI debug colour.

Emergency, alert and critical use WP_CLI::error_multi_line().

Info logs are not prepended with "Info: ", as other levels are. I'm not 100% set on this.

TODO

Level Filtering

I imagine there is a Composer package that provides the same utility as WooCommerce's WC_Logger::should_handle() function, and is extensible. If I come across one, I'll include it here.

When WP CLI commands are appended with --debug or more specifically --debug=my-plugin-slug, all messages should be output. This should be part of any ::should_handle() function.

psr/log >=2.0

This currently requires "psr/log": "^1.0". v2.0 requires PHP 8.0 and introduces parameter types; 3.0 then introduces return types.

Context

Context is not printed.

See Also

• BH WP Logger – this class was extracted from that
• BH Color Logger – like this, for unit tests