Racket LSP disables syntax highlighting

[HereComesTheMoon]

Summary

If the Racket LSP is enabled there's no syntax highlighting whatsoever. Here's my languages.toml file:

[[language]]
name = "racket"
scope = "source.rkt"
roots = []
file-types = ["rkt"]
shebangs = ["racket"]
comment-token = ";"
grammar = "racket"
language-server = { command = "racket", args = ["-l", "racket-langserver"] }

[[grammar]]
name = "racket"
source = { git = "https://github.com/6cdh/tree-sitter-racket", rev = "09cb27a06415bce529a26774a842f5a80d50d362" }

Notes:

• The language server appears to connect to helix, and is installed properly.
• If I change the rkt in file-types = ["rkt"] to gibberish (or comment out the entire language block), then there is syntax highlighting
• I tried to install the tree-sitter-racket thing to see if that'd help at all. It was a bit of a struggle, and I still don't think that it works.
• Without tree-sitter-racket the issue persists
• I used the latest version of Helix in the Arch repositories (from September), and the latest git build, there were no observable differences

Reproduction Steps

Install racket and the racket language server (using raco) as specified on the installation page. Have this in your language.toml.

[[language]]
name = "racket"
scope = "source.rkt"
roots = []
file-types = ["rkt"]
shebangs = ["racket"]
comment-token = ";"
grammar = "racket"
language-server = { command = "racket", args = ["-l", "racket-langserver"] }

Racket files (ie. those with extension .rkt) will have no syntax highlighting if the above is set correctly. When removing the above lines .rkt files will have syntax highlighting.

Helix log

With LSP enabled and opening a racket file with hx -v, these are the the log entries:

~/.cache/helix/helix.log

2022-11-27T23:21:58.408 helix_view::editor [ERROR] Failed to initialize the LSP for `source.toml` { cannot find binary path }
2022-11-27T23:22:37.361 helix_view::clipboard [INFO] Using wl-copy+wl-paste to interact with the system and selection (primary) clipboard
2022-11-27T23:22:37.362 helix_lsp::transport [INFO] -> {"jsonrpc":"2.0","method":"initialize","params":{"capabilities":{"textDocument":{"codeAction":{"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}}},"completion":{"completionItem":{"insertReplaceSupport":true,"resolveSupport":{"properties":["documentation","detail","additionalTextEdits"]},"snippetSupport":false},"completionItemKind":{}},"hover":{"contentFormat":["markdown"]},"publishDiagnostics":{},"rename":{"dynamicRegistration":false,"honorsChangeAnnotations":false,"prepareSupport":false},"signatureHelp":{"signatureInformation":{"activeParameterSupport":true,"documentationFormat":["markdown"],"parameterInformation":{"labelOffsetSupport":true}}}},"window":{"workDoneProgress":true},"workspace":{"applyEdit":true,"configuration":true,"didChangeConfiguration":{"dynamicRegistration":false},"executeCommand":{"dynamicRegistration":false},"symbol":{"dynamicRegistration":false},"workspaceFolders":true}},"processId":206149,"rootPath":"/home/mond/Racket/AdventOfCode2022","rootUri":"file:///home/mond/Racket/AdventOfCode2022","workspaceFolders":[{"name":"AdventOfCode2022","uri":"file:///home/mond/Racket/AdventOfCode2022"}]},"id":0}

Platform

Linux

Terminal Emulator

foot-extra

Helix Version

helix 22.08.1 (583c2a5)

[the-mikedavis]

Syntax highlighting is done through tree-sitter rather than LSP. Currently the highlighting is provided by tree-sitter-scheme:

helix/languages.toml

Lines 1525 to 1536 in bf908cc

	[[language]]
	name = "scheme"
	scope = "source.scheme"
	injection-regex = "scheme"
	file-types = ["ss", "rkt"] # "scm",
	roots = []
	comment-token = ";"
	indent = { tab-width = 2, unit = " " }
	[[grammar]]
	name = "scheme"
	source = { git = "https://github.com/6cdh/tree-sitter-scheme", rev = "27fb77db05f890c2823b4bd751c6420378df146b" }

Adding that block to your ~/.config/helix/languages.toml must change the precedence so that we use racket over scheme for rkt files.

It looks like since rkt files belong to scheme, you can't currently use the racket language server. This can be fixed in this repository's languages.toml by explicitly using the scheme grammar for the racket [[language]] entry and setting up queries that inherit from scheme.