Gleam syntax highlighting is broken

[manveru]

Summary

Syntax highlighting for Gleam doesn't work, presumably since #13807 was merged, I tried with 25.07.1 (43990ed0) and latest HEAD: 25.07.1 (001efa80).

Reproduction Steps

Happens when opening any .gleam file.

Helix log

~/.cache/helix/helix.log

2025-08-14T15:47:33.671 helix_core::syntax [ERROR] Failed to compile highlights for 'gleam': invalid node type "doc_comment_content"
  --> 5:3
   |
 4 | ; Inject markdown into documentation comments
 5 | ((doc_comment_content) @injection.content
   |   ^^^^^^^^^^^^^^^^^^^
 6 |  (#set! injection.language "markdown")
   |

Platform

Linux

Terminal Emulator

Ghostty 1.1.3-889478f-nix

Installation Method

nix

Helix Version

helix 25.07.1 (43990ed)

[RoloEdits]

have you tried to rebuild the grammar with hx --grammar fetch and hx --grammar build?

[manveru]

Yes, I even tried deleting everything in ~/.config/helix/runtime and fetching/building grammars again to no avail.

❯ : rm -rf ~/.config/helix/runtime
❯ : hx -g fetch
Fetching 255 grammars
255 updated grammars
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        vim                now on f3cd62d8bd043ef20507e84bb6b4b53731ccf3a7
        vue                now on 91fe2754796cd8fba5f229505a23fa08f3546c06
        wast               now on 2ca28a9f9d709847bf7a3de0942a84e912f59088
        wat                now on 2ca28a9f9d709847bf7a3de0942a84e912f59088
        werk               now on 92b0f7fe98465c4c435794a58e961306193d1c1e
        wesl               now on 94ee6122680ef8ce2173853ca7c99f7aaeeda8ce
        wgsl               now on 272e89ef2aeac74178edb9db4a83c1ffef80a463
        wit                now on c917790ab9aec50c5fd664cbfad8dd45110cfff3
        xit                now on 7d7902456061bc2ad21c64c44054f67b5515734c
        xml                now on 48a7c2b6fb9d515577e115e6788937e837815651
        xtc                now on 7bc11b736250c45e25cfb0215db2f8393779957e
        yaml               now on 0e36bed171768908f331ff7dff9d956bae016efb
        yara               now on eb3ede203275c38000177f72ec0f9965312806ef
        yuck               now on e3d91a3c65decdea467adebe4127b8366fa47919
        zig                now on eb7d58c2dc4fbeea4745019dee8df013034ae66b

❯ : hx -g build
Building 255 grammars
255 grammars built now
        ["ada", "adl", "agda", "alloy", "amber", "astro", "awk", "bash", "bass", "beancount", "bibtex", "bicep", "bitbake", "blade", "blueprint", "c", "c-sharp", "caddyfile", "cairo", "capnp", "cel", "circom", "clarity", "clojure", "cmake", "comment", "cpon", "cpp", "crystal", "css", "csv", "cue", "cylc", "d", "dart", "dbml", "debian", "devicetree", "dhall", "diff", "djot", "dockerfile", "dot", "dtd", "dunstrc", "earthfile", "edoc", "eex", "elisp", "elixir", "elm", "elvish", "embedded-template", "erlang", "esdl", "fennel", "fga", "fidl", "fish", "forth", "fortran", "fsharp", "gas", "gdscript", "gherkin", "ghostty", "git-config", "git-rebase", "gitattributes", "gitcommit", "gitignore", "gleam", "glimmer", "glsl", "gn", "go", "go-format-string", "godot-resource", "gomod", "gotmpl", "gowork", "gpr", "graphql", "gren", "groovy", "hare", "haskell", "haskell-persistent", "hcl", "hdl", "heex", "hocon", "hoon", "hosts", "html", "htmldjango", "hurl", "hyprlang", "iex", "ini", "ink", "inko", "janet-simple", "java", "javascript", "jinja2", "jjdescription", "jjrevset", "jjtemplate", "jq", "jsdoc", "json", "json5", "jsonnet", "julia", "just", "kdl", "koka", "kotlin", "koto", "latex", "ld", "ldif", "lean", "ledger", "llvm", "llvm-mir", "lobster", "log", "lpf", "lua", "luap", "luau", "mail", "make", "markdoc", "markdown", "markdown_inline", "matlab", "mermaid", "meson", "mojo", "move", "nasm", "nginx", "nickel", "nim", "nix", "nu", "ocaml", "ocaml-interface", "odin", "ohm", "opencl", "openscad", "org", "pascal", "passwd", "pem", "perl", "pest", "php", "php-only", "pkl", "po", "pod", "ponylang", "powershell", "prisma", "prolog", "properties", "proto", "prql", "pug", "purescript", "python", "ql", "qmljs", "query", "quint", "r", "regex", "rego", "rescript", "robot", "robots", "roc", "ron", "rst", "ruby", "rust", "rust-format-args", "scala", "scheme", "scss", "slang", "slim", "slint", "smali", "smithy", "sml", "snakemake", "solidity", "sourcepawn", "spade", "spicedb", "sql", "sshclientconfig", "strace", "supercollider", "svelte", "sway", "swift", "t32", "tablegen", "tact", "task", "tcl", "teal", "templ", "tera", "textproto", "thrift", "tlaplus", "todotxt", "toml", "tsx", "twig", "typescript", "typespec", "typst", "ungrammar", "unison", "uxntal", "v", "vala", "vento", "verilog", "vhdl", "vhs", "vim", "vue", "wast", "wat", "werk", "wesl", "wgsl", "wit", "xit", "xml", "xtc", "yaml", "yara", "yuck", "zig"]

[RoloEdits]

On latest master I am still getting highlighting:

Does highlighting work with other languages?

[manveru]

No highlighting for me on latest master (001efa801e28cd19147d9369890133c2d631842a).
Every other language I tried works (Nix, Ruby, Markdown, TOML, JSON, Erlang, Javascript, CSV, HTML, and more).

[manveru]

I think it should be easily reproducible by using
nix build github:helix-editor/helix/001efa801e28cd19147d9369890133c2d631842a

[the-mikedavis]

The highlighting fails because the highlights.scm query fails to compile:

2025-08-14T15:47:33.671 helix_core::syntax [ERROR] Failed to compile highlights for 'gleam': invalid node type "doc_comment_content"
  --> 5:3
   |
 4 | ; Inject markdown into documentation comments
 5 | ((doc_comment_content) @injection.content
   |   ^^^^^^^^^^^^^^^^^^^
 6 |  (#set! injection.language "markdown")
   |

That doc_comment_content node is new, so you must be running an older revision of tree-sitter-gleam which doesn't have this node. I'm guessing you have a [[grammar]] entry in your languages.toml config which is setting an older revision.

It's not reproducible on master, queries are checked in CI

[manveru]

Thank you very much, I forgot that I had that customized. Updating it fixed it.