nixd times out on large files #691
Description
Describe the bug
I'm using nvim. I'm testing by just directly calling vim.lsp.buf.format({}).
On a large file I tested (1428 lines) I get
[LSP][nixd] timeout
On a smaller flake file I tested (186 lines) the command works fine and I can see that the file has been reformatted.
Logs (Required)
[ERROR][2025-05-23 11:38:20] ...p/_transport.lua:0 "rpc" "nixd" "stderr" "I[11:38:20.409] 74232: "
[ERROR][2025-05-23 11:38:20] ...p/_transport.lua:0 "rpc" "nixd" "stderr" "<-- textDocument/formatting(18)\n"
[ERROR][2025-05-23 11:38:21] ...p/_transport.lua:0 "rpc" "nixd" "stderr" "I[11:38:21.438] 74232: <-- $/cancelRequest\nI[11:38:21.438] 74232: unhandled notification $/cancelRequest\n"
Configuration
I'm using nixvim, but its a super simple config.
nixd = {
enable = true;
settings.nixd = {
formatting.command = [ "nixfmt" ];
};
};
To Reproduce
On a flake.nix file from nixpkgs, 195 lines
Screen.Recording.2025-05-23.at.11.46.13.AM.mov
On the all-packages.nix file from nixpkgs, 18k lines
Screen.Recording.2025-05-23.at.11.48.34.AM.mov
time nixfmt all-packages.nix
real 0m0.583s
user 0m0.537s
sys 0m0.029s
This does not exceed the nvim format default timeout of 1s.
Expected behavior
It not to time out
Screenshots
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Additional context
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