Add check-update commands for plugins and themes

[Copilot]

Adds wp plugin check-update and wp theme check-update commands, providing parity with wp core check-update.

Implementation

Commands added:

• wp plugin check-update [<plugin>...] [--all] [--fields=<fields>] [--format=<format>]
• wp theme check-update [<theme>...] [--all] [--fields=<fields>] [--format=<format>]

Behavior:

• Exit code 0 always (matches core check-update)
• Success message when no updates available
• Table output listing available updates (name, status, version, update_version)
• Supports filtering by specific items or --all flag
• Supports output formats: table, csv, json, yaml

Files modified:

• src/Plugin_Command.php - Added check_update() method with @subcommand check-update annotation
• src/Theme_Command.php - Added check_update() method with @subcommand check-update annotation
• composer.json - Registered new commands

Tests:

• features/plugin-check-update.feature - 7 scenarios
• features/theme-check-update.feature - 7 scenarios

Example Usage

# Check for updates
$ wp plugin check-update
+-----------+--------+---------+----------------+
| name      | status | version | update_version |
+-----------+--------+---------+----------------+
| akismet   | active | 4.1.0   | 4.1.1          |
+-----------+--------+---------+----------------+

# No updates available
$ wp theme check-update
Success: All themes are up to date.

# Check specific items or all
$ wp plugin check-update akismet
$ wp theme check-update --all --format=json

Resolves #112

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Possibility to check-updates for plugins, themes and languages</issue_title>
<issue_description>I think it would be very helpful if there is a possibility to check if updates exist.
Thes feature is already implemented for the wp core:

https://developer.wordpress.org/cli/commands/core/check-update/

But there is no such a feature for plugins, themes and languagepacks.

Plugin parameter overview:

https://developer.wordpress.org/cli/commands/plugin/

Theme parameter overview:

https://developer.wordpress.org/cli/commands/theme/

Langauge parameter overview:

https://developer.wordpress.org/cli/commands/language/core/
https://developer.wordpress.org/cli/commands/language/plugin/
https://developer.wordpress.org/cli/commands/language/theme/

It would be also nice, if the check-update parameter provide returncodes.
Example:

wp plugin check-update -> no updates -> returncode = 0

wp core check-update -> update available -> returncode = 1

wp theme check-update -> unknown error -> returncode = 2

Thanks and Cheers

</issue_description>

Comments on the Issue (you are @copilot in this section)

@danielbachhuber Thanks for the suggestion, @MoBlockbuster !

I'm amenable to creating parity with wp core check-update. We'll want to follow its behavior, though:

$ wp core check-update
Success: WordPress is at the latest version.
$ echo $?
0
$ wp core check-update
+---------+-------------+-----------------------------------------------------------------------+
| version | update_type | package_url                                                           |
+---------+-------------+-----------------------------------------------------------------------+
| 6.1.4   | minor       | https://downloads.wordpress.org/release/wordpress-6.1.4-partial-0.zip |
| 6.4.1   | major       | https://downloads.wordpress.org/release/wordpress-6.4.1.zip           |
+---------+-------------+-----------------------------------------------------------------------+
$ echo $?
0

Notably, the return code is always 0, even when there are updates available.</comment_new>
<comment_new>@mrsdizzie
If you want to se if there are any plugin or theme updates (as in your example) this currently works and provides sort of similar information:

wp plugin list --update=available
wp theme list --update=available

I'm not familiar with languages but I think it works similarly:
wp language plugin list --all --update=available

I don't know if plugins can provide details on if something is a patch or major update since they all probably use different versioning.</comment_new>

• Fixes Possibility to check-updates for plugins, themes and languages #384

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[swissspidy]

@copilot you're missing the @subcommand check-update annotation for the two new subcommand methods.

[Copilot]

@copilot you're missing the @subcommand check-update annotation for the two new subcommand methods.

Added the @subcommand check-update annotation to both methods in commit 0f4b688.

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Plugin_Command.php	96.66%	1 Missing ⚠️
src/Theme_Command.php	94.44%	1 Missing ⚠️

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