Ocaml-lsp-server: Text object queries

Ecosystem
1

I noticed that text object queries are not supported by ocaml-lsp-server.

❯ hx --health ocaml
Configured language servers:
  ✓ ocamllsp: /Users/joel/.opam/5.2.0+ox/bin/ocamllsp
Configured debug adapter: None
Configured formatter: ocamlformat
Binary for formatter: /Users/joel/.opam/5.2.0+ox/bin/ocamlformat
Tree-sitter parser: ✓
Highlight queries: ✓
Textobject queries: ✘
Indent queries: ✓

What does it take to add them?

2

Helix’ “text object queries” aren’t a LSP thing (or they use a strange name for some LSP feature Specification), but a Treesitter feature that has to be added to Helix itself, if I understand this page Adding textobject queries correctly

3

I don’t think that’s the case. Same Helix gives me the ability to select a type, function, etc. with Zig.

❯ hx --health zig
Configured language servers:
  ✓ zls: /opt/homebrew/bin/zls
Configured debug adapter: lldb-dap
Binary for debug adapter: /opt/homebrew/opt/llvm/bin/lldb-dap
Configured formatter: zig
Binary for formatter: /opt/homebrew/bin/zig
Tree-sitter parser: ✓
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓
4

Here is the textobjects.scm file for zig in the Helix source:

whereas for Ocaml it is missing: helix/runtime/queries/ocaml at 1491cbc8f3694e52a565d192eaef1a7bf200d33f · helix-editor/helix · GitHub

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5

Text objects are a Helix feature, not an LSP one, and they require a tree-sitter grammar (ugh) and tree-sitter queries file for language-specific support.

6

Mea culpa!

I’ll add it to my list of OCaml-related things to fix.

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7

I tried to add some to a similar neovim projects nvim-treesitter-textobjects/queries/ocaml/textobjects.scm at master · nvim-treesitter/nvim-treesitter-textobjects · GitHub.
I’m far from a treesitter expert, so I expect things can be done better, but it’s starting point.

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