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languages/haskell.nix: add cabal formatter options

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Unwrap cabal-fmt from the haskell-language-server binary, and add an
option to configure the executable between cabal-fmt and cabal-gild.
This commit is contained in:
dathegreat 2026-05-15 14:04:47 -06:00
commit e7f3af5445
2 changed files with 50 additions and 15 deletions
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19
modules/plugins/lsp/presets/haskell-language-server.nix
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@ -4,11 +4,16 @@
pkgs,
...
}: let
inherit (lib.meta) getExe';
inherit (lib.meta) getExe getExe';
inherit (lib.modules) mkIf;
inherit (lib.nvim.types) mkLspPresetEnableOption;
cfg = config.vim.lsp.presets.haskell-language-server;
cabalFmtCfg = config.vim.languages.haskell.cabalFormat;
cabalFormats = {
cabal-fmt = pkgs.haskellPackages.cabal-fmt;
cabal-gild = pkgs.haskellPackages.cabal-gild;
};
in {
options.vim.lsp.presets.haskell-language-server = {
enable = mkLspPresetEnableOption "haskell-language-server" "Haskell" [];
@ -23,18 +28,16 @@ in {
paths = [pkgs.haskellPackages.haskell-language-server];
meta.mainProgram = "haskell-language-server-wrapper";
buildInputs = [pkgs.makeBinaryWrapper];
postBuild = ''
wrapProgram $out/bin/haskell-language-server-wrapper \
--prefix PATH : ${pkgs.haskellPackages.cabal-fmt}/bin
'';
}) "haskell-language-server-wrapper")
"--lsp"
];
root_markers = ["hie.yaml" "stack.yaml" "cabal.project" "*.cabal" "package.yaml"];
settings = {
settings = mkIf cabalFmtCfg.enable {
haskell = {
# cabal-fmt is an external tool; it is wrapped into the LSP binary's PATH above
cabalFormattingProvider = "cabal-fmt";
cabalFormattingProvider = cabalFmtCfg.type;
# This option is undocumented in the haskell-language-server docs, but it does exist in the plugin API
# https://github.com/haskell/haskell-language-server/blob/f158128ec034bec1667c440262641086bbb4d359/plugins/hls-cabal-fmt-plugin/src/Ide/Plugin/CabalFmt.hs#L51
plugin.${cabalFmtCfg.type}.config.path = getExe cabalFormats.${cabalFmtCfg.type};
};
};
};