feat: migrate-from-smush + Picture-tag rewriter (v0.2.0)
Unblocks production use on sites previously running Smush.
migrate-from-smush:
- Reads wp-smpro-smush-data postmeta, writes _h4b_img_optim marker
- --dry-run / --force-rescan / --remove-smush-meta / --limit flags
- Verified: 100 attachments migrated cleanly on dev.rds.ink,
bulk count drops from 734 → 634
Picture_Tag rewriter:
- Hooks the_content + post_thumbnail_html + widget_text + Elementor
frontend + wp_get_attachment_image at priority 99
- Wraps <img> in <picture><source avif><source webp><img></picture>
when sibling files exist
- Double-wrap protection via byte-range tracking of existing <picture> blocks
- Per-image opt-out via data-no-h4b attribute
- Cached sibling lookups per request
- 8 edge-case tests pass
LOC: 2480 (was 1997). Adds class-cli-migrate.php (193 LOC) and
class-picture-tag.php (284 LOC).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
193
includes/class-cli-migrate.php
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193
includes/class-cli-migrate.php
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@@ -0,0 +1,193 @@
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<?php
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/**
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* wp h4b-img migrate-from-smush
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*
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* Reads Smush's `wp-smpro-smush-data` postmeta and writes an equivalent
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* `_h4b_img_optim` marker so our bulk command skips already-processed images.
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*
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* @package H4B\ImageOptim
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*/
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namespace H4B\ImageOptim;
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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final class CLI_Migrate {
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public const SMUSH_META_KEY = 'wp-smpro-smush-data';
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/**
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* Migrate Smush optimisation history into h4b-image-optim's tracking.
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*
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* ## OPTIONS
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*
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* [--dry-run]
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* : Count only — do not write any postmeta.
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*
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* [--force-rescan]
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* : Mark Smush-processed images as UNPROCESSED so our bulk command
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* re-runs them through our pipeline. Use this when migrating off
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* Smush and you want to re-optimise everything with our ICC-safe
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* settings. Default: false (skip them, trust Smush did fine).
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*
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* [--remove-smush-meta]
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* : After migration, delete the wp-smpro-smush-data postmeta. Frees
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* ~1KB per attachment. Default: false (keep for audit).
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*
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* [--limit=<n>]
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* : Max attachments to migrate. 0 = unlimited.
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*
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* ## EXAMPLES
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* # See how many Smush-processed images exist
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* wp h4b-img migrate-from-smush --dry-run
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*
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* # Trust Smush's prior work — just mark them processed
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* wp h4b-img migrate-from-smush
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*
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* # Re-optimise everything from scratch through our pipeline
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* wp h4b-img migrate-from-smush --force-rescan
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*
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* # Also strip the Smush postmeta after migration
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* wp h4b-img migrate-from-smush --remove-smush-meta
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*/
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public function __invoke( $args, $assoc ): void {
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$dry_run = ! empty( $assoc['dry-run'] );
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$force_rescan = ! empty( $assoc['force-rescan'] );
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$remove_smush = ! empty( $assoc['remove-smush-meta'] );
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$limit = (int) ( $assoc['limit'] ?? 0 );
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global $wpdb;
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$base_sql = "SELECT pm.post_id, pm.meta_value, p.post_mime_type
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FROM {$wpdb->postmeta} pm
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INNER JOIN {$wpdb->posts} p ON p.ID = pm.post_id
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WHERE pm.meta_key = %s
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ORDER BY pm.post_id ASC";
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if ( $limit > 0 ) {
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$base_sql .= ' LIMIT ' . (int) $limit;
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}
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$rows = $wpdb->get_results( $wpdb->prepare( $base_sql, self::SMUSH_META_KEY ) );
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$total = count( $rows );
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\WP_CLI::log( "Found $total attachments with Smush optimisation history." );
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if ( $total === 0 ) {
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\WP_CLI::success( 'Nothing to migrate.' );
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return;
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}
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if ( $dry_run ) {
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$action = $force_rescan ? 'mark for re-optimisation' : 'mark as already processed';
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$remove = $remove_smush ? ' + remove Smush meta' : '';
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\WP_CLI::success( "Dry-run only. Would $action $total attachments$remove." );
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return;
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}
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$progress = \WP_CLI\Utils\make_progress_bar( 'Migrating', $total );
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$migrated = 0;
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$skipped = 0;
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$errored = 0;
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$removed_meta = 0;
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foreach ( $rows as $row ) {
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$id = (int) $row->post_id;
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try {
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if ( $force_rescan ) {
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// Wipe our marker so bulk treats this as unprocessed
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delete_post_meta( $id, Attachment_Meta::META_KEY );
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} else {
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$existing = Attachment_Meta::get( $id );
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if ( ! empty( $existing['processed_at'] ) ) {
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$skipped++;
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$progress->tick();
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continue;
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}
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$stats = self::translate_smush_stats( (string) $row->meta_value );
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$meta = [
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'version' => H4B_IMG_OPTIM_VERSION,
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'processed_at' => current_time( 'c' ),
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'migrated_from' => 'smush',
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'tool_chain' => [ 'smush_legacy' ],
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'sizes' => $stats['sizes'],
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'totals' => $stats['totals'],
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'note' => 'Migrated from Smush — not re-processed by h4b-image-optim.',
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];
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Attachment_Meta::set( $id, $meta );
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}
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if ( $remove_smush ) {
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if ( delete_post_meta( $id, self::SMUSH_META_KEY ) ) {
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$removed_meta++;
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}
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}
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$migrated++;
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} catch ( \Throwable $e ) {
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$errored++;
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}
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$progress->tick();
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}
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$progress->finish();
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\WP_CLI::success( sprintf(
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"Migration done.\n Migrated: %d\n Already-marked (skipped): %d\n Errors: %d\n Smush meta removed: %d",
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$migrated, $skipped, $errored, $removed_meta
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) );
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}
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/**
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* Translate Smush's serialized stats into our schema.
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*
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* Smush stores:
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* a:2:{
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* s:"stats" => [ time, bytes, percent, size_before, size_after, lossy, keep_exif, api_version ],
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* s:"sizes" => [ <size_key> => stdClass{ time, bytes, percent, size_before, size_after }, ... ]
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* }
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*/
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private static function translate_smush_stats( string $raw ): array {
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$result = [
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'sizes' => [],
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'totals' => [
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'bytes_saved' => 0,
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'bytes_before' => 0,
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'bytes_after' => 0,
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'percent' => 0,
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],
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];
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// Smush uses PHP serialize. Allow stdClass.
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$data = @unserialize( $raw, [ 'allowed_classes' => [ \stdClass::class ] ] );
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if ( ! is_array( $data ) ) {
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return $result;
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}
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if ( isset( $data['stats'] ) && is_array( $data['stats'] ) ) {
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$result['totals']['bytes_saved'] = (int) ( $data['stats']['bytes'] ?? 0 );
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$result['totals']['bytes_before'] = (int) ( $data['stats']['size_before'] ?? 0 );
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$result['totals']['bytes_after'] = (int) ( $data['stats']['size_after'] ?? 0 );
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$result['totals']['percent'] = (float) ( $data['stats']['percent'] ?? 0 );
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}
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if ( isset( $data['sizes'] ) && is_array( $data['sizes'] ) ) {
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foreach ( $data['sizes'] as $size_key => $info ) {
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// $info can be stdClass or array
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$arr = is_object( $info ) ? get_object_vars( $info ) : (array) $info;
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$result['sizes'][ (string) $size_key ] = [
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'status' => 'migrated_from_smush',
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'before' => (int) ( $arr['size_before'] ?? 0 ),
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'after' => (int) ( $arr['size_after'] ?? 0 ),
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'percent' => (float) ( $arr['percent'] ?? 0 ),
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'icc_preserved' => false, // unknown — Smush stripped it
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'tool_chain' => [ 'smush_legacy' ],
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'webp' => null,
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'avif' => null,
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'avif_status' => 'never_generated',
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'backup' => null,
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'error' => null,
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];
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}
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}
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return $result;
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}
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}
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@@ -15,8 +15,9 @@ final class CLI {
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public static function register(): void {
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\WP_CLI::add_command( 'h4b-img', __CLASS__ );
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\WP_CLI::add_command( 'h4b-img bulk', CLI_Bulk::class );
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\WP_CLI::add_command( 'h4b-img rescue', CLI_Rescue::class );
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\WP_CLI::add_command( 'h4b-img bulk', CLI_Bulk::class );
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\WP_CLI::add_command( 'h4b-img rescue', CLI_Rescue::class );
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\WP_CLI::add_command( 'h4b-img migrate-from-smush', CLI_Migrate::class );
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}
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/**
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284
includes/class-picture-tag.php
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284
includes/class-picture-tag.php
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@@ -0,0 +1,284 @@
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<?php
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/**
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* Rewrites <img src="…jpg|png"> tags to <picture> with WebP + AVIF sources.
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*
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* Design notes
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* ============
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* 1. We hook `the_content` (post body), `post_thumbnail_html` (featured image)
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* and `wp_get_attachment_image` (most theme/plugin image calls). For Elementor
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* we register on `elementor/frontend/the_content` as well — Elementor pipes
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* the_content through its own filter chain in some templates.
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*
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* 2. Sibling files MUST exist on disk for us to emit a <source>. If only WebP
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* exists, we emit just the WebP source; same for AVIF. We never emit a
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* <source> pointing at a non-existent file (would 404 in browsers).
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*
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* 3. Sibling naming convention is `<original>.webp` / `<original>.avif`.
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* That matches what Format_Generator produces AND what Smush already
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* produces in `wp-content/smush-webp/<rel>.webp` (we mirror-resolve too).
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*
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* 4. We DO NOT rewrite:
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* - <img> already inside a <picture> (avoid double-wrapping)
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* - <img> with data-no-h4b attribute
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* - <img> with no usable src
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* - srcset URLs (sources list is more semantic; let the browser pick)
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*
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* 5. Keep ALL original <img> attributes intact (class, alt, srcset, sizes,
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* width, height, loading, decoding, fetchpriority, …). The <img> remains
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* the visible fallback for browsers that don't understand <picture>.
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*
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* 6. Performance: build the regex once, iterate once over each filter call.
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* Cache the "do the siblings exist" check per request (static array).
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*
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* @package H4B\ImageOptim
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*/
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namespace H4B\ImageOptim;
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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final class Picture_Tag {
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/** @var array<string,array{webp:?string,avif:?string}> path → urls */
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private static array $sibling_cache = [];
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public static function register(): void {
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if ( ! Settings::get( 'rewrite_content_images', true ) ) {
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return;
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}
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// Run LATE so other filters get to manipulate the raw <img> first.
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add_filter( 'the_content', [ self::class, 'rewrite_html' ], 99 );
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add_filter( 'post_thumbnail_html', [ self::class, 'rewrite_html' ], 99 );
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add_filter( 'widget_text', [ self::class, 'rewrite_html' ], 99 );
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// Elementor's frontend content filter
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add_filter( 'elementor/frontend/the_content', [ self::class, 'rewrite_html' ], 99 );
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// Single attachment_image (commonly used by themes + WooCommerce)
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add_filter( 'wp_get_attachment_image', [ self::class, 'rewrite_html' ], 99, 5 );
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}
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/**
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* Rewrite all <img> tags in $html to <picture> wrappers where siblings exist.
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*
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* Skips <img> tags that are already inside an existing <picture>…</picture>
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* (whether the surrounding <picture> existed in the input or was added by
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* this same filter pass).
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*/
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public static function rewrite_html( $html, ...$_extra ): string {
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// Coerce to string; some filters can pass non-string in edge cases.
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if ( ! is_string( $html ) || $html === '' ) {
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return is_string( $html ) ? $html : '';
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}
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// Quick reject: no <img tag?
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if ( stripos( $html, '<img' ) === false ) {
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return $html;
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}
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// 1. Identify byte-range spans of existing <picture>…</picture> blocks
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// so we never touch <img> tags inside them.
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$picture_ranges = self::find_picture_ranges( $html );
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// 2. Single-pass walk: rebuild output with non-img bytes copied through
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// and <img> tags rewritten if they sit outside any picture range AND
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// have qualifying siblings.
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$out = '';
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$cursor = 0;
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$pattern = '#<img\\b[^>]*>#i';
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if ( ! preg_match_all( $pattern, $html, $matches, PREG_OFFSET_CAPTURE ) ) {
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return $html;
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}
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foreach ( $matches[0] as $match ) {
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[ $img_tag, $offset ] = $match;
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$end = $offset + strlen( $img_tag );
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// Copy through bytes preceding this <img>
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$out .= substr( $html, $cursor, $offset - $cursor );
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if ( self::is_inside_range( $offset, $picture_ranges ) ) {
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// Already inside an existing <picture>; leave alone.
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$out .= $img_tag;
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} else {
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$out .= self::maybe_wrap( $img_tag );
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}
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$cursor = $end;
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}
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$out .= substr( $html, $cursor );
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return $out;
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}
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/**
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* Build a list of [start, end_exclusive] byte ranges covering every
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* <picture>…</picture> block in $html.
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*
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* @return array<int, array{0:int,1:int}>
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*/
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private static function find_picture_ranges( string $html ): array {
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$ranges = [];
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$offset = 0;
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while ( true ) {
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$open = stripos( $html, '<picture', $offset );
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if ( $open === false ) {
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break;
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}
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$close = stripos( $html, '</picture>', $open );
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if ( $close === false ) {
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break;
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}
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$ranges[] = [ $open, $close + strlen( '</picture>' ) ];
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$offset = $close + 1;
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}
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return $ranges;
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}
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/**
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* @param array<int, array{0:int,1:int}> $ranges
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*/
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private static function is_inside_range( int $offset, array $ranges ): bool {
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foreach ( $ranges as [ $start, $end ] ) {
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if ( $offset >= $start && $offset < $end ) {
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return true;
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}
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}
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return false;
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}
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/**
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* Decide whether to wrap a single <img> tag.
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*/
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private static function maybe_wrap( string $img_tag ): string {
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// Skip if explicitly opted out
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if ( strpos( $img_tag, 'data-no-h4b' ) !== false ) {
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return $img_tag;
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}
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// Extract src
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if ( ! preg_match( '#\\bsrc=([\'"])(.+?)\\1#i', $img_tag, $sm ) ) {
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return $img_tag;
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}
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$src = $sm[2];
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// Only handle http(s) / protocol-relative / site-relative URLs
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$siblings = self::resolve_siblings( $src );
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if ( ! $siblings['webp'] && ! $siblings['avif'] ) {
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return $img_tag;
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}
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// Build srcset for picture sources if we can. For simplicity v0.1
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// emits a plain source URL (srcset handling for sizes is a v0.2 task).
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$sources = '';
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if ( $siblings['avif'] ) {
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$sources .= sprintf(
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"<source type=\"image/avif\" srcset=\"%s\">",
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esc_attr( $siblings['avif'] )
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);
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}
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if ( $siblings['webp'] ) {
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$sources .= sprintf(
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"<source type=\"image/webp\" srcset=\"%s\">",
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esc_attr( $siblings['webp'] )
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);
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}
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return '<picture>' . $sources . $img_tag . '</picture>';
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}
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/**
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* Given an image URL, return WebP + AVIF sibling URLs if they exist on disk.
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*
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* @return array{webp:?string, avif:?string}
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*/
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private static function resolve_siblings( string $url ): array {
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if ( isset( self::$sibling_cache[ $url ] ) ) {
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return self::$sibling_cache[ $url ];
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}
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$result = [ 'webp' => null, 'avif' => null ];
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// Only act on JPG / JPEG / PNG
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if ( ! preg_match( '#\\.(jpe?g|png)(\\?.*)?$#i', $url ) ) {
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return self::$sibling_cache[ $url ] = $result;
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}
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// Strip query string for filesystem lookup
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$url_clean = strtok( $url, '?' );
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// Convert URL → absolute path on disk
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$path = self::url_to_path( $url_clean );
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if ( $path === null ) {
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return self::$sibling_cache[ $url ] = $result;
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}
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// Candidate 1: alongside the source (what we generate)
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$webp_alongside = $path . '.webp';
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$avif_alongside = $path . '.avif';
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// Candidate 2: Smush's smush-webp/ tree
|
||||
$content_dir = trailingslashit( WP_CONTENT_DIR );
|
||||
$content_url = trailingslashit( WP_CONTENT_URL );
|
||||
$smush_webp_path = null;
|
||||
$smush_webp_url = null;
|
||||
if ( strpos( $path, $content_dir . 'uploads/' ) === 0 ) {
|
||||
$rel = substr( $path, strlen( $content_dir . 'uploads/' ) );
|
||||
$smush_webp_path = $content_dir . 'smush-webp/' . $rel . '.webp';
|
||||
$smush_webp_url = $content_url . 'smush-webp/' . $rel . '.webp';
|
||||
}
|
||||
|
||||
if ( is_readable( $webp_alongside ) ) {
|
||||
$result['webp'] = $url_clean . '.webp';
|
||||
} elseif ( $smush_webp_path && is_readable( $smush_webp_path ) ) {
|
||||
$result['webp'] = $smush_webp_url;
|
||||
}
|
||||
|
||||
if ( is_readable( $avif_alongside ) ) {
|
||||
$result['avif'] = $url_clean . '.avif';
|
||||
}
|
||||
|
||||
return self::$sibling_cache[ $url ] = $result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Convert a URL to its absolute filesystem path, or null if the URL is
|
||||
* external / can't be resolved to a local file.
|
||||
*/
|
||||
private static function url_to_path( string $url ): ?string {
|
||||
$uploads = wp_get_upload_dir();
|
||||
$content_dir = trailingslashit( WP_CONTENT_DIR );
|
||||
$content_url = trailingslashit( WP_CONTENT_URL );
|
||||
|
||||
// Strip protocol-relative
|
||||
if ( strpos( $url, '//' ) === 0 ) {
|
||||
$url = 'https:' . $url;
|
||||
}
|
||||
|
||||
// Site root (handles http vs https mismatches between admin + frontend)
|
||||
$home = home_url();
|
||||
$home_alt = preg_replace( '#^https?://#', '', $home );
|
||||
|
||||
// Match wp-content/ specifically (covers themes + plugins + uploads)
|
||||
if ( strpos( $url, $content_url ) === 0 ) {
|
||||
return $content_dir . substr( $url, strlen( $content_url ) );
|
||||
}
|
||||
|
||||
// Match the uploads URL even if served from a CDN-prefixed URL that
|
||||
// rewrites only the uploads part (we don't use a CDN but sites might)
|
||||
if ( strpos( $url, $uploads['baseurl'] ) === 0 ) {
|
||||
return $uploads['basedir'] . substr( $url, strlen( $uploads['baseurl'] ) );
|
||||
}
|
||||
|
||||
// Site-relative
|
||||
if ( $url !== '' && $url[0] === '/' && strpos( $url, '//' ) !== 0 ) {
|
||||
// /wp-content/uploads/2026/02/foo.jpg
|
||||
$content_path = '/' . wp_basename( $content_dir ) . '/';
|
||||
if ( strpos( $url, $content_path ) === 0 ) {
|
||||
return $content_dir . substr( $url, strlen( $content_path ) );
|
||||
}
|
||||
}
|
||||
|
||||
return null;
|
||||
}
|
||||
}
|
||||
@@ -22,6 +22,8 @@ require_once H4B_IMG_OPTIM_DIR . 'includes/class-rescue-detector.php';
|
||||
require_once H4B_IMG_OPTIM_DIR . 'includes/class-cli.php';
|
||||
require_once H4B_IMG_OPTIM_DIR . 'includes/class-cli-bulk.php';
|
||||
require_once H4B_IMG_OPTIM_DIR . 'includes/class-cli-rescue.php';
|
||||
require_once H4B_IMG_OPTIM_DIR . 'includes/class-cli-migrate.php';
|
||||
require_once H4B_IMG_OPTIM_DIR . 'includes/class-picture-tag.php';
|
||||
|
||||
final class Plugin {
|
||||
|
||||
@@ -45,6 +47,9 @@ final class Plugin {
|
||||
// Upload pipeline
|
||||
Uploader_Hook::register();
|
||||
|
||||
// Front-end <picture> rewriting
|
||||
Picture_Tag::register();
|
||||
|
||||
// Background AVIF queue (WP-Cron)
|
||||
Format_Generator::register_cron();
|
||||
|
||||
|
||||
Reference in New Issue
Block a user