lux/modules/capabilities/helix.nix

{ inputs, ... }:
{
  flake.modules.nixos.helix = {
    nix.settings = {
      extra-substituters = [ "https://helix.cachix.org" ];
      extra-trusted-public-keys = [
        "helix.cachix.org-1:ejp9KQpR1FBI2onstMQ34yogDm4OgU2ru6lIwPvuCVs="
      ];
    };
  };

  flake.modules.homeManager.helix =
    { pkgs, ... }:
    let
      svelteLanguageServer = pkgs.svelte-language-server.overrideAttrs (
        finalAttrs: previousAttrs: {
          version = "0.18.3";

          pnpmWorkspaces = [
            "svelte-language-server..."
            "typescript-svelte-plugin..."
          ];

          src = pkgs.fetchFromGitHub {
            owner = "sveltejs";
            repo = "language-tools";
            tag = "svelte-language-server@${finalAttrs.version}";
            hash = "sha256-FTOkJPXbsG6R53yr4n0/IR2lzFCovrdV0+epOi07lBQ=";
          };

          pnpmDeps = pkgs.fetchPnpmDeps {
            inherit (finalAttrs)
              pname
              version
              src
              pnpmWorkspaces
              ;
            pnpm = pkgs.pnpm_10;
            fetcherVersion = 3;
            hash = "sha256-fY3hrCkr/soJk1gp39/jec8lT2ZJI27xRBCZi006oWA=";
          };

          buildPhase = builtins.replaceStrings
            [ "pnpm run --filter=svelte-language-server... build" ]
            [ ''
              pnpm run --filter=svelte-language-server... build
              pnpm --filter=typescript-svelte-plugin exec tsc \
                -p ./ \
                --pretty false \
                --types node \
                --typeRoots ../../node_modules/.pnpm/node_modules/@types
            '' ]
            previousAttrs.buildPhase;

          installPhase = builtins.replaceStrings
            [ "pnpm install --filter=svelte-language-server..." ]
            [ "pnpm install --filter=svelte-language-server... --filter=typescript-svelte-plugin..." ]
            previousAttrs.installPhase;

          postInstall = (previousAttrs.postInstall or "") + ''
            substituteInPlace \
              "$out/lib/node_modules/svelte-language-server/packages/language-server/node_modules/@vscode/emmet-helper/lib/cjs/emmetHelper.js" \
              --replace-fail \
              "'jsx.enabled': syntax === 'jsx'," \
              "'jsx.enabled': syntax === 'jsx' || syntax === 'html',"

            ln -s ../packages/typescript-plugin \
              "$out/lib/node_modules/svelte-language-server/node_modules/typescript-svelte-plugin"

            ln -s ../packages/language-server/node_modules/svelte \
              "$out/lib/node_modules/svelte-language-server/node_modules/svelte"
          '';
        }
      );
    in
    {
      programs.helix = {
        enable = true;
        defaultEditor = true;
        package = inputs.helix.packages.${pkgs.stdenv.hostPlatform.system}.default;
        extraPackages = with pkgs; [
          vtsls
          svelteLanguageServer
          tailwindcss-language-server

          nixd
          nixfmt
          oxfmt

          simple-completion-language-server

          odin
          ols

          rust-analyzer
          rustfmt
          cargo
        ];

        settings = {
          theme = "kanagawa-custom";
          editor = {
            soft-wrap.enable = true;
            lsp = {
              auto-document-highlight = true;
              display-inlay-hints = false;
            };
            rainbow-brackets = true;
            line-number = "relative";
            cursorline = true;
            gutters = [
              "code-action-hint"
              "diagnostics"
              "spacer"
              "line-numbers"
              "spacer"
              "diff"
            ];
            color-modes = true;
            cursor-shape = {
              insert = "bar";
              normal = "block";
              select = "underline";
            };
          };
        };

        themes.kanagawa-custom = {
          inherits = "kanagawa";
          "ui.highlight".underline = {
            color = "dragonBlue";
            style = "line";
          };
        };

        languages = {
          language-server.scls = {
            command = "simple-completion-language-server";
            environment.SNIPPETS_PATH = "${pkgs.vimPlugins.friendly-snippets}/snippets";
          };

          language-server.vtsls.config.vtsls = {
            autoUseWorkspaceTsdk = true;
            tsserver.globalPlugins = [
              {
                name = "typescript-svelte-plugin";
                location = "${svelteLanguageServer}/lib/node_modules/svelte-language-server";
                enableForWorkspaceTypeScriptVersions = true;
              }
            ];
          };

          language = [
            {
              name = "javascript";
              language-servers = [
                "vtsls"
                "scls"
              ];
              auto-format = true;
            }
            {
              name = "jsx";
              language-servers = [
                "vtsls"
                "scls"
              ];
              auto-format = true;
            }
            {
              name = "typescript";
              language-servers = [
                "vtsls"
                "scls"
              ];
              auto-format = true;
            }
            {
              name = "tsx";
              language-servers = [
                "vtsls"
                "scls"
              ];
              auto-format = true;
            }
            {
              name = "svelte";
              formatter = {
                command = "${pkgs.coreutils}/bin/env";
                args = [
                  "NODE_PATH=%{workspace_directory}/node_modules"
                  "oxfmt"
                  "--stdin-filepath=%{buffer_name}"
                ];
              };
              auto-format = true;
              language-servers = [
                "scls"
                "svelteserver"
                "tailwindcss-ls"
              ];
            }
            {
              name = "nix";
              auto-format = true;
            }
            {
              name = "rust";
              auto-format = true;
            }
          ];
        };
      };
    };
}