Add uninstall method to clean up plugin options

readme.md

@@ -109,6 +109,7 @@ Project and support maintained on github at [pfefferle/wordpress-webmention](htt
 * Fix `array_merge()` error when `_embedded` key is missing in WordPress API response.
 * Fix fatal error when parsing invalid date strings in webmentions.
 * Fix span tags inside anchor tags confusing WordPress auto-linking.
+* Add uninstall method to clean up plugin options on deletion.
 * Add `webmention_form_submit_text` filter to customize the "Ping me!" button text.
 * Fix distorted emoji display when avatars are disabled in Discussion settings.
 * Add basic styling for webmention form input and button elements.

uninstall.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * Webmention Uninstall
+ *
+ * Fired when the plugin is uninstalled to clean up plugin options and cached files.
+ *
+ * @package Webmention
+ */
+
+// If uninstall not called from WordPress, exit.
+if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
+	exit;
+}
+
+/**
+ * Delete all plugin options.
+ */
+$options = array(
+	// Settings registered in class-admin.php.
+	'webmention_disable_selfpings_same_url',
+	'webmention_disable_selfpings_same_domain',
+	'webmention_disable_media_mentions',
+	'webmention_support_post_types',
+	'webmention_show_comment_form',
+	'webmention_comment_form_text',
+	'webmention_home_mentions',
+	'webmention_approve_domains',
+	'webmention_avatars',
+	'webmention_avatar_store_enable',
+	'webmention_separate_comment',
+	'webmention_show_facepile',
+	'webmention_facepile_fold_limit',
+	// Legacy option for media mentions.
+	'webmention_send_media_mentions',
+	// Database version tracking.
+	'webmention_db_version',
+	// Migration lock.
+	'webmention_migration_lock',
+);
+
+foreach ( $options as $option ) {
+	delete_option( $option );
+}
+
+/**
+ * Delete cached avatar files using WP_Filesystem.
+ */
+global $wp_filesystem;
+
+if ( ! function_exists( 'WP_Filesystem' ) ) {
+	require_once ABSPATH . 'wp-admin/includes/file.php';
+}
+
+WP_Filesystem();
+
+if ( $wp_filesystem ) {
+	$upload_dir     = wp_get_upload_dir();
+	$webmention_dir = $upload_dir['basedir'] . '/webmention';
+
+	// Delete the entire webmention directory recursively.
+	if ( $wp_filesystem->is_dir( $webmention_dir ) ) {
+		$wp_filesystem->delete( $webmention_dir, true );
+	}
+}