No syntax highlight for gleam until ran :TSBufEnable highlight

[glyh]

Describe the bug

For gleam, I have to run :TSBufEnable highlight to see the highlight, this doesn't happen to other languages.

To Reproduce

1. Install gleam on nvim-treesitter
2. Open some gleam files

Expected behavior

Syntax highlighting works just fine.

Output of :checkhealth nvim-treesitter

==============================================================================
nvim-treesitter: require("nvim-treesitter.health").check()

Installation ~
- WARNING `tree-sitter` executable not found (parser generator, only needed for :TSInstallFromGrammar, not required for :TSInstall)
- OK `node` found v21.7.3 (only needed for :TSInstallFromGrammar)
- OK `git` executable found.
- OK `cc` executable found. Selected from { vim.NIL, "cc", "gcc", "clang", "cl", "zig" }
  Version: cc (GCC) 13.2.1 20240417
- OK Neovim was compiled with tree-sitter runtime ABI version 14 (required >=13). Parsers must be compatible with runtime ABI.

OS Info:
{
  machine = "x86_64",
  release = "6.8.9-arch1-1",
  sysname = "Linux",
  version = "#1 SMP PREEMPT_DYNAMIC Thu, 02 May 2024 17:49:46 +0000"
} ~

Parser/Features         H L F I J
  - bash                ✓ ✓ ✓ . ✓
  - c                   ✓ ✓ ✓ ✓ ✓
  - cuda                ✓ ✓ ✓ ✓ ✓
  - gleam               ✓ ✓ ✓ ✓ ✓
  - go                  ✓ ✓ ✓ ✓ ✓
  - lua                 ✓ ✓ ✓ ✓ ✓
  - markdown            ✓ . ✓ ✓ ✓
  - markdown_inline     ✓ . . . ✓
  - python              ✓ ✓ ✓ ✓ ✓
  - query               ✓ ✓ ✓ ✓ ✓
  - ruby                ✓ ✓ ✓ ✓ ✓
  - vim                 ✓ ✓ ✓ . ✓
  - vimdoc              ✓ . . . ✓

  Legend: H[ighlight], L[ocals], F[olds], I[ndents], In[j]ections
         +) multiple parsers found, only one will be used
         x) errors found in the query, try to run :TSUpdate {lang} ~

Output of nvim --version

NVIM v0.10.0-dev-3096+g17c89eac1
Build type: RelWithDebInfo
LuaJIT 2.1.1713484068
Run "nvim -V1 -v" for more info

Additional context

No response

[clason]

Need a reproducible setup, otherwise there's nothing we can do. Also, make sure your filetype is actually set to gleam (before nvim-treesitter is loaded; lazy-loading is not supported).

[jjramsey]

FWIW, I have a similar problem, but with hyprlang instead of gleam. In my case, either :TSEnable highlight or :TSBufEnable highlight works.

Output of :checkhealth nvim-treesitter:

==============================================================================
nvim-treesitter: require("nvim-treesitter.health").check()

Installation ~
- OK `tree-sitter` found 0.22.6 (b40f342067a89cd6331bf4c27407588320f3c263) (parser generator, only needed for :TSInstallFromGrammar)
- OK `node` found v22.4.1 (only needed for :TSInstallFromGrammar)
- OK `git` executable found.
- OK `cc` executable found. Selected from { vim.NIL, "cc", "gcc", "clang", "cl", "zig" }
  Version: cc (GCC) 14.1.1 20240522
- OK Neovim was compiled with tree-sitter runtime ABI version 14 (required >=13). Parsers must be compatible with runtime ABI.

OS Info:
{
  machine = "x86_64",
  release = "6.6.40-1-lts",
  sysname = "Linux",
  version = "#1 SMP PREEMPT_DYNAMIC Mon, 15 Jul 2024 09:23:08 +0000"
} ~

Parser/Features         H L F I J
  - bash                ✓ ✓ ✓ . ✓
  - c                   ✓ ✓ ✓ ✓ ✓
  - hyprlang            ✓ . ✓ ✓ ✓
  - lua                 ✓ ✓ ✓ ✓ ✓
  - markdown            ✓ . ✓ ✓ ✓
  - markdown_inline     ✓ . . . ✓
  - python              ✓ ✓ ✓ ✓ ✓
  - query               ✓ ✓ ✓ ✓ ✓
  - vimdoc              ✓ . . . ✓

  Legend: H[ighlight], L[ocals], F[olds], I[ndents], In[j]ections
         +) multiple parsers found, only one will be used
         x) errors found in the query, try to run :TSUpdate {lang} ~

I had installed the nvim-treesetter plugin via vim-plug. Here's my init.lua:

local vim = vim

vim.filetype.add({
  pattern = { [".*/hypr/.*%.conf"] = "hyprlang" },
})

local Plug = vim.fn['plug#']

vim.call('plug#begin')

Plug('nvim-treesitter/nvim-treesitter', { ['do'] = ':TSUpdate' })

vim.call('plug#end')

The file that I was editing had the name ~/.config/hypr/hyprland.conf. The pattern for filename matching was cribbed from https://github.com/tree-sitter-grammars/tree-sitter-hyprlang.

Running :set filetype=hyprlang does nothing.

Neovim and tree-sitter (not nvim-treesitter) were installed via regular Arch Linux packages. (The neovim-nvim-treesitter package from the AUR wasn't used because it got me the sort of errors described here: #3092.)