languages/elixir: add HEEx and EEx treesitter grammars

docs/release-notes/rl-0.8.md

@@ -492,3 +492,8 @@
 - Fix default [blink.cmp] sources "path" and "buffer" not working when
   `autocomplete.nvim-cmp.enable` was disabled and
   `autocomplete.nvim-cmp.sources` had not been modified.
+
+[Morsicus](https://github.com/Morsicus):
+
+- add [EEx Treesitter Grammar](https://github.com/connorlay/tree-sitter-eex) for Elixir
+- add [HEEx Treesitter Grammar](https://github.com/phoenixframework/tree-sitter-heex) for Elixir

modules/plugins/languages/elixir.nix

@@ -50,6 +50,8 @@ in {
     treesitter = {
       enable = mkEnableOption "Elixir treesitter" // {default = config.vim.languages.enableTreesitter;};
       package = mkGrammarOption pkgs "elixir";
+      heexPackage = mkGrammarOption pkgs "heex";
+      eexPackage = mkGrammarOption pkgs "eex";
     };
 
     lsp = {
@@ -93,7 +95,11 @@ in {
   config = mkIf cfg.enable (mkMerge [
     (mkIf cfg.treesitter.enable {
       vim.treesitter.enable = true;
-      vim.treesitter.grammars = [cfg.treesitter.package];
+      vim.treesitter.grammars = [
+        cfg.treesitter.package
+        cfg.treesitter.heexPackage
+        cfg.treesitter.eexPackage
+      ];
     })
 
     (mkIf cfg.lsp.enable {