languages/tera: add syntax highlighting support for tera templating

Author: snoweuph

configuration.nix

@@ -95,6 +95,7 @@ isMaximal: {
 
       tailwind.enable = false;
       svelte.enable = false;
+      tera.enable = false;
 
       # Nim LSP is broken on Darwin and therefore
       # should be disabled by default. Users may still enable

docs/manual/release-notes/rl-0.9.md

@@ -151,6 +151,9 @@
 - Added [Selenen](https://github.com/kampfkarren/selene) for more diagnostics in
   `languages.lua`.
 
+- Added [tera](https://keats.github.io/tera/) language support (syntax
+  highlighting only).
+
 [vagahbond](https://github.com/vagahbond): [codewindow.nvim]:
 https://github.com/gorbit99/codewindow.nvim
 

modules/plugins/languages/default.nix

@@ -19,6 +19,7 @@ in {
     ./helm.nix
     ./kotlin.nix
     ./html.nix
+    ./tera.nix
     ./haskell.nix
     ./java.nix
     ./json.nix

modules/plugins/languages/tera.nix

@@ -0,0 +1,28 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (lib.options) mkEnableOption;
+  inherit (lib.modules) mkIf mkMerge;
+  inherit (lib.nvim.types) mkGrammarOption;
+
+  cfg = config.vim.languages.tera;
+in {
+  options.vim.languages.tera = {
+    enable = mkEnableOption "Tera templating language support";
+
+    treesitter = {
+      enable = mkEnableOption "Tera treesitter" // {default = config.vim.languages.enableTreesitter;};
+      package = mkGrammarOption pkgs "tera";
+    };
+  };
+
+  config = mkIf cfg.enable (mkMerge [
+    (mkIf cfg.treesitter.enable {
+      vim.treesitter.enable = true;
+      vim.treesitter.grammars = [cfg.treesitter.package];
+    })
+  ]);
+}