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Building Emacs Major Modes with Tree-sitter: Lessons Learned

Over the past year I’ve been spending a lot of time building Tree-sitter-powered major modes for Emacs – clojure-ts-mode (as co-maintainer), neocaml (from scratch), and asciidoc-mode (also from scratch). Between the three projects I’ve accumulated enough knowledge (and battle scars) to write about the experience. This post distills the key lessons for anyone thinking about writing a Tree-sitter-based major mode, or curious about what it’s actually like.

27 Feb 2026

Bozhidar Batsov

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Building Emacs Major Modes with TreeSitter: Lessons Learned

Over the past year I’ve been spending a lot of time building TreeSitter-powered major modes for Emacs – clojure-ts-mode (as co-maintainer), neocaml (from scratch), and asciidoc-mode (also from scratch). Between the three projects I’ve accumulated enough battle scars to write about the experience. This post distills the key lessons for anyone thinking about writing a TreeSitter-based major mode, or curious about what it’s actually like.

27 Feb 2026

Bozhidar Batsov

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Reading Camlp4, part 6: parsing

In this post I want to discuss Camlp4’s stream parsers and grammars . Since the OCaml parsers in Camlp4 (which we touched on previously ) u...

20 May 2010

Jake Donham

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