Linkable

Linkable is a lightweight WordPress plugin that automates internal linking by converting defined keywords into links to selected posts or pages.

Core functionality: * Automatically links keywords to chosen posts or pages * Works on singular posts and pages by filtering the_content at priority 20 * Searches for keyword matches inside <p>, <li>, <b>, <em>, and <i> tags * Skips self-links by excluding the current post from the keyword map * Uses the Yoast SEO title for link tooltips when Yoast is active, otherwise falls back to the WordPress title * Preserves existing <a> tags and shortcodes by backing them up before processing and restoring them afterward

Keyword management: * Keywords are stored per post and per page as JSON in the linkable_tags post meta field * linkable_tags is registered with REST support, sanitized via sanitize_text_field, and restricted to users with edit_posts

Settings: * Accessible via Settings → Linkable * max_links_per_target: limits how many times the same target can be linked from one post (default 1) * first_occurrence_only: when enabled, each keyword is linked only once per post

Performance: * Builds a global keyword map from all published posts and pages with linkable_tags * Caches the keyword map with a transient (global_linkable_tag_map) for one hour * Query optimized to fetch only IDs and avoid unnecessary meta/term caching

Editor compatibility: * Works with both the block editor and the classic editor * Enqueues an admin sidebar panel script (static/js/admin-sidebar-panel.js) with WordPress dependencies and versioning via filemtime

Security: * URLs are properly escaped with esc_url * Link titles are sanitized and HTML-escaped * Meta registration includes capability and sanitization checks

License

This plugin is licensed under the GPLv2 or later.