Adding tags queries

See tree-sitter's documentation on Code Navigation Systems for more background on tags queries.

Helix provides LSP-like features such as document and workspace symbol pickers out-of-the-box for languages with tags.scm queries based on syntax trees. To be analyzed a language must have a tree-sitter grammar and a tags.scm query file which pattern matches interesting nodes from syntax trees.

Query files should be placed in runtime/queries/{language}/tags.scm when contributing to Helix. You may place these under your local runtime directory (~/.config/helix/runtime in Linux for example) for the sake of testing.

The following captures are recognized:

Example query files can be found in the Helix GitHub repository.