Split into core repo and grammars

[mjambon]

Goal: make it simple to use the ocaml-tree-sitter runtime library as a git submodule without pulling the big tree-sitter-* submodules that contain generated files for real-world languages.

Proposed split:

• ocaml-tree-sitter-core repo containing:
  • src and scripts folders with all the machinery for code generation and runtime
  • tests folder with the end-to-end tests on simple grammars
• ocaml-tree-sitter-semgrep repo containing:
  • lang folder which wraps around real-world grammars and includes tree-sitter-* repos as submodules
  • ocaml-tree-sitter-core repo as a submodule
• ocaml-tree-sitter-languages repo: similar to ocaml-tree-sitter-semgrep but without the grammar extensions for semgrep patterns. This is for the community of users of tree-sitter and ocaml, independently from semgrep.

Two-step plan

Phase 1

1. Clone ocaml-tree-sitter to ocaml-tree-sitter-core.
2. Remove the languages from the lang/ folder in ocaml-tree-sitter-core.
3. Create core submodule in ocaml-tree-sitter. Remove duplicate code. Create symlinks to core as needed.

Phase 2

1. Rename ocaml-tree-sitter → ocaml-tree-sitter-semgrep.
2. Make semgrep use ocaml-tree-sitter-core instead of ocaml-tree-sitter.
3. Create community repo ocaml-tree-sitter-languages on the same model as ocaml-tree-sitter-semgrep.

[Phase 3 - later]

Simplify the structure of the repos, minimize reliance on symlinks.

Progress

• [x] phase 1
• [x] phase 2.1
• [ ] phase 2.2
• [x] phase 2.3
• [x] update documentation in ocaml-tree-sitter-core
• [x] update documentation in ocaml-tree-sitter-semgrep
• [x] update links to documentation from semgrep

[aryx]

Yep, sounds good