R: adding LSP (#378)

* r: implementing lsp

* r: version bump to context fixes treesitter bug

* r: changing treesitter package definition to mkGrammarOption

* added changelog entry

* docs: wording

---------

Co-authored-by: raf <raf@notashelf.dev>

configuration.nix

@@ -59,6 +59,7 @@ isMaximal: {
       python.enable = isMaximal;
       dart.enable = isMaximal;
       bash.enable = isMaximal;
+      r.enable = isMaximal;
       tailwind.enable = isMaximal;
       typst.enable = isMaximal;
       clang = {

docs/release-notes/rl-0.7.md

@@ -108,6 +108,7 @@ everyone.
   plugin's options can now be found under `indentBlankline.setupOpts`, the
   previous iteration of the module also included out of place/broken options,
   which have been removed for the time being. These are:
+
   - `listChar` - this was already unused
   - `fillChar` - this had nothing to do with the plugin, please configure it
     yourself by adding `vim.opt.listchars:append({ space = '<char>' })` to your
@@ -191,3 +192,7 @@ everyone.
 - Telescope:
   - Fixed `project-nvim` command and keybinding
   - Added default ikeybind/command for `Telescope resume` (`<leader>fr`)
+
+[Soliprem](https://github.com/Soliprem)
+
+- Add LSP and Treesitter support for R under `vim.languages.R`.

flake.lock

@@ -1280,11 +1280,11 @@
     "plugin-nvim-treesitter-context": {
       "flake": false,
       "locked": {
-        "lastModified": 1716388265,
-        "narHash": "sha256-EY5Si6t7LXcxOP3ubGAAMd3lgbeaCOCIybSKi1Ucx98=",
+        "lastModified": 1726947805,
+        "narHash": "sha256-5oN/vyhSqDqjLEzECj01A7A+Yq7U1H1HXLbzkC1Ljqw=",
         "owner": "nvim-treesitter",
         "repo": "nvim-treesitter-context",
-        "rev": "f62bfe19e0fbc13ae95649dfb3cf22f4ff85b683",
+        "rev": "3d5390c49e3f8fe457b376df2a49aa39d75b7911",
         "type": "github"
       },
       "original": {

modules/plugins/languages/default.nix

@@ -17,6 +17,7 @@ in {
     ./ocaml.nix
     ./php.nix
     ./python.nix
+    ./r.nix
     ./rust.nix
     ./sql.nix
     ./svelte.nix

modules/plugins/languages/r.nix

@@ -0,0 +1,78 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (builtins) attrNames;
+  inherit (lib.options) mkEnableOption mkOption literalExpression;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.lists) isList;
+  inherit (lib.types) enum either listOf package str;
+  inherit (lib.nvim.lua) expToLua;
+  inherit (lib.nvim.types) mkGrammarOption;
+
+  cfg = config.vim.languages.r;
+
+  r-with-languageserver = pkgs.rWrapper.override {
+    packages = with pkgs.rPackages; [languageserver];
+  };
+
+  defaultServer = "r_language_server";
+  servers = {
+    r_language_server = {
+      package = pkgs.writeShellScriptBin "r_lsp" ''
+        ${r-with-languageserver}/bin/R --slave -e "languageserver::run()"
+      '';
+      lspConfig = ''
+        lspconfig.r_language_server.setup{
+          capabilities = capabilities;
+          on_attach = default_on_attach;
+          cmd = ${
+          if isList cfg.lsp.package
+          then expToLua cfg.lsp.package
+          else ''{"${lib.getExe cfg.lsp.package}"}''
+        }
+        }
+      '';
+    };
+  };
+in {
+  options.vim.languages.r = {
+    enable = mkEnableOption "R language support";
+
+    treesitter = {
+      enable = mkEnableOption "R treesitter" // {default = config.vim.languages.enableTreesitter;};
+      package = mkGrammarOption pkgs "r";
+    };
+
+    lsp = {
+      enable = mkEnableOption "R LSP support" // {default = config.vim.languages.enableLSP;};
+
+      server = mkOption {
+        description = "R LSP server to use";
+        type = enum (attrNames servers);
+        default = defaultServer;
+      };
+
+      package = mkOption {
+        description = "R LSP server package, or the command to run as a list of strings";
+        example = literalExpression "[ (lib.getExe pkgs.jdt-language-server) \"-data\" \"~/.cache/jdtls/workspace\" ]";
+        type = either package (listOf str);
+        default = servers.${cfg.lsp.server}.package;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+
+    (mkIf cfg.lsp.enable {
+      vim.lsp.lspconfig.enable = true;
+      vim.lsp.lspconfig.sources.r-lsp = servers.${cfg.lsp.server}.lspConfig;
+    })
+  ]);
+}