languages/haskell.nix: move haskell-tools config into languages.haskell.extensions and hls presets into lsp/presets/hls.nix

modules/plugins/lsp/presets/default.nix

@@ -22,6 +22,7 @@
     ./gopls.nix
     ./harper.nix
     ./helm-ls.nix
+    ./hls.nix
     ./intelephense.nix
     ./jdt-language-server.nix
     ./jinja-lsp.nix

modules/plugins/lsp/presets/hls.nix

@@ -0,0 +1,42 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib.meta) getExe';
+  inherit (lib.modules) mkDefault mkIf;
+  inherit (lib.nvim.types) mkLspPresetEnableOption;
+  inherit (lib.generators) mkLuaInline;
+
+  cfg = config.vim.lsp.presets.hls;
+in {
+  options.vim.lsp.presets.hls = {
+    enable = mkLspPresetEnableOption "hls" "Haskell" [];
+  };
+
+  config = mkIf cfg.enable {
+    vim.lsp.servers.hls = {
+      enable = true;
+      cmd = [(getExe' pkgs.haskellPackages.haskell-language-server "haskell-language-server-wrapper") "--lsp"];
+      filetypes = ["haskell" "lhaskell"];
+      root_dir =
+        mkLuaInline
+        /*
+        lua
+        */
+        ''
+          function(bufnr, on_dir)
+            local fname = vim.api.nvim_buf_get_name(bufnr)
+            on_dir(util.root_pattern('hie.yaml', 'stack.yaml', 'cabal.project', '*.cabal', 'package.yaml')(fname))
+          end
+        '';
+      settings = {
+        haskell = {
+          formattingProvider = mkDefault "ormolu";
+          cabalFormattingProvider = "cabal-fmt";
+        };
+      };
+    };
+  };
+}