README

Batch migration of WordPress classic editor content to Gutenberg blocks.

Requirements

PHP 8.2+
WordPress 6.2+
Composer

Installation

This plugin uses Composer for autoloading. You must run composer install before activating:

composer install

If dependencies are missing, the plugin displays an admin notice and does not load.

Usage

WP-CLI

# Show how many classic posts need conversion
wp classic-to-gutenberg status

# Preview conversion without saving
wp classic-to-gutenberg convert --dry-run

# Convert all classic posts
wp classic-to-gutenberg convert

# Convert specific post types
wp classic-to-gutenberg convert --post-type=post,page

# Detect unparseable content before converting
wp classic-to-gutenberg detect
wp classic-to-gutenberg detect --format=csv

# Rollback a converted post
wp classic-to-gutenberg rollback 42

Admin Row Actions

On the Posts/Pages list screen, classic posts (without block markup) show two additional row actions:

Convert to Blocks — converts the post content and saves immediately
Preview Blocks — shows a preview of the converted block markup without saving

Supported Conversions

Classic HTML	Gutenberg Block
`<p>`	`core/paragraph`
`<h1>`–`<h6>`	`core/heading`
`<ul>`, `<ol>`	`core/list` with `core/list-item`
`<blockquote>`	`core/quote` with inner `core/paragraph`
`<table>`	`core/table` (requires `<thead>` + `<tbody>`)
`<img>`	`core/image` (standalone, linked, or in `<figure>`)
`<pre>`	`core/preformatted`
`<hr>`	`core/separator`
`<!--more-->`	`core/more`
`<!--nextpage-->`	`core/nextpage`
`[caption]`	`core/image` with caption
`[gallery]`	`core/gallery` with inner `core/image`
Other shortcodes	`core/shortcode`
Unrecognized HTML	`core/html` (fallback)

Hooks

Filters

classic_to_gutenberg_converters — register custom block converters
classic_to_gutenberg_pre_convert — filter content before conversion
classic_to_gutenberg_post_convert — filter content after conversion
classic_to_gutenberg_finder_args — filter post finder query arguments
classic_to_gutenberg_shortcode_handlers — extend shortcode handler registry

Actions

classic_to_gutenberg_post_converted — fired after each post conversion
classic_to_gutenberg_post_rolled_back — fired after rollback
classic_to_gutenberg_batch_started — fired before batch conversion
classic_to_gutenberg_batch_completed — fired after batch conversion

Development

composer cs               # Run PHPCS
composer cs:fix           # Fix PHPCS violations
composer analyse          # Run PHPStan
composer test             # Run all tests
composer test:unit        # Run unit tests only
composer test:integration # Run integration tests only

Local WordPress Environment

ddev start && ddev orchestrate

Git Hooks

Enable the pre-commit hook (PHPCS + PHPStan on staged files):

git config core.hooksPath .githooks

Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

Acknowledgements

Development of this plugin is supported by

License

GPL-2.0-or-later

apermo/classic-to-gutenberg

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