feature: svelte lsp and diagnostics

extra.nix

@@ -54,6 +54,7 @@ inputs: let
           crates.enable = true;
         };
         ts.enable = isMaximal;
+        svelte.enable = isMaximal;
         go.enable = isMaximal;
         zig.enable = isMaximal;
         python.enable = isMaximal;

lib/types/plugins.nix

@@ -81,6 +81,9 @@ with lib; let
     "project-nvim"
     "elixir-ls"
     "elixir-tools"
+    "vim-svelte"
+    "vim-javascript"
+    "vim-html"
   ];
   # You can either use the name of the plugin or a package.
   pluginsType = with types;

modules/languages/default.nix

@@ -22,6 +22,7 @@ in {
     ./ts.nix
     ./zig.nix
     ./html.nix
+    ./svelte.nix
   ];
 
   options.vim.languages = {

modules/languages/svelte.nix

@@ -0,0 +1,144 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.languages.svelte;
+
+  defaultServer = "svelte";
+  servers = {
+    svelte = {
+      package = pkgs.nodePackages.svelte-language-server;
+      lspConfig = ''
+        lspconfig.svelte.setup {
+          capabilities = capabilities;
+          on_attach = attach_keymaps,
+          cmd = { "${cfg.lsp.package}/bin/svelteserver", "--stdio" }
+        }
+      '';
+    };
+  };
+
+  # TODO: specify packages
+  defaultFormat = "prettier";
+  formats = {
+    prettier = {
+      package = pkgs.nodePackages.prettier;
+      nullConfig = ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.formatting.prettier.with({
+            command = "${cfg.format.package}/bin/prettier",
+          })
+        )
+      '';
+    };
+  };
+
+  # TODO: specify packages
+  defaultDiagnostics = ["eslint_d"];
+  diagnostics = {
+    eslint_d = {
+      package = pkgs.nodePackages.eslint_d;
+      nullConfig = pkg: ''
+        table.insert(
+          ls_sources,
+          null_ls.builtins.diagnostics.eslint_d.with({
+            command = "${lib.getExe pkg}",
+          })
+        )
+      '';
+    };
+  };
+in {
+  options.vim.languages.svelte = {
+    enable = mkEnableOption "Svelte language support";
+
+    treesitter = {
+      enable = mkOption {
+        description = "Enable Svelte treesitter";
+        type = types.bool;
+        default = config.vim.languages.enableTreesitter;
+      };
+      sveltePackage = nvim.types.mkGrammarOption pkgs "svelte";
+    };
+
+    lsp = {
+      enable = mkOption {
+        description = "Enable Svelte LSP support";
+        type = types.bool;
+        default = config.vim.languages.enableLSP;
+      };
+      server = mkOption {
+        description = "Svelte LSP server to use";
+        type = with types; enum (attrNames servers);
+        default = defaultServer;
+      };
+      package = mkOption {
+        description = "Svelte LSP server package";
+        type = types.package;
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+
+    format = {
+      enable = mkOption {
+        description = "Enable Svelte formatting";
+        type = types.bool;
+        default = config.vim.languages.enableFormat;
+      };
+      type = mkOption {
+        description = "Svelte formatter to use";
+        type = with types; enum (attrNames formats);
+        default = defaultFormat;
+      };
+      package = mkOption {
+        description = "Svelte formatter package";
+        type = types.package;
+        default = formats.${cfg.format.type}.package;
+      };
+    };
+
+    extraDiagnostics = {
+      enable = mkOption {
+        description = "Enable extra Svelte diagnostics";
+        type = types.bool;
+        default = config.vim.languages.enableExtraDiagnostics;
+      };
+      types = lib.nvim.types.diagnostics {
+        langDesc = "Svelte";
+        inherit diagnostics;
+        inherit defaultDiagnostics;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.sveltePackage];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.svelte-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+
+    (mkIf cfg.format.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources.svelte-format = formats.${cfg.format.type}.nullConfig;
+    })
+
+    (mkIf cfg.extraDiagnostics.enable {
+      vim.lsp.null-ls.enable = true;
+      vim.lsp.null-ls.sources = lib.nvim.languages.diagnosticsToLua {
+        lang = "svelte";
+        config = cfg.extraDiagnostics.types;
+        inherit diagnostics;
+      };
+    })
+  ]);
+}