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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.
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.
I wasn’t an early adopter of TreeSitter in Emacs, as usually such big transitions are not smooth and the initial support for TreeSitter in Emacs left much to be desired. Recently, however, Emacs 30 was released with many improvements on that front, and I felt the time was right for me to (try to) embrace TreeSitter.
