Code block index / TOC for posts

[ajaydsouza]

Summary

A shortcode/block that lists all code blocks in the current post with jump links, using each block's language and filename/title, optionally filterable by language.

Details

• Depends on stable per-block anchors (see issue Line-number anchor links (shareable deep links) #7); reuse the same id scheme.
• [wzcbh_index] shortcode plus a small dynamic block; server-side render walks parse_blocks() output for core/code blocks and builds the list.
• Entries show filename (issue Filename / caption tab header above code block #2) or title attribute, language label, and line count.
• Language filter chips are progressive enhancement (plain list without JS).

Why

Long tutorials and reference posts with many snippets benefit from quick navigation; pairs naturally with the KB/documentation use case.

Speed to implement: Medium · Usefulness: Low-Medium · Rank: 10