nixvim: support highlight groups

modules/highlights.nix

@@ -0,0 +1,30 @@
+{ config, lib, helpers, ... }:
+with lib;
+{
+  options = {
+    highlight = mkOption {
+      type = types.attrsOf types.anything;
+      default = { };
+      description = "Define highlight groups";
+      example = ''
+        highlight = {
+          Comment.fg = '#ff0000';
+        };
+      '';
+    };
+  };
+
+  config = mkIf (config.highlight != { }) {
+    extraConfigLuaPost = ''
+      -- Highlight groups {{
+      do
+        local highlights = ${helpers.toLuaObject config.highlight}
+
+        for k,v in pairs(highlights) do
+          vim.api.nvim_set_hl(0, k, v)
+        end
+      end
+      -- }}
+    '';
+  };
+}

tests/flake.lock

@@ -97,12 +97,12 @@
       },
       "locked": {
         "lastModified": 0,
-        "narHash": "sha256-2xKbMFW3jSlyvl1ZKoe9sNe4h5k5Qk410Dom4TU3nls=",
+        "narHash": "sha256-3m9eDTuaK9RS8HpctJwSu1wnyx5/CILSGppr+6OjTPw=",
-        "path": "/nix/store/89k711hq8f8j87h2kadz5kivkcpxjv58-source",
+        "path": "/nix/store/pp50jx20wrkbrkv3mxkwzckciy8xcqy2-source",
         "type": "path"
       },
       "original": {
-        "path": "/nix/store/89k711hq8f8j87h2kadz5kivkcpxjv58-source",
+        "path": "/nix/store/pp50jx20wrkbrkv3mxkwzckciy8xcqy2-source",
         "type": "path"
       }
     },
@@ -116,12 +116,12 @@
       },
       "locked": {
         "lastModified": 0,
-        "narHash": "sha256-2xKbMFW3jSlyvl1ZKoe9sNe4h5k5Qk410Dom4TU3nls=",
+        "narHash": "sha256-3m9eDTuaK9RS8HpctJwSu1wnyx5/CILSGppr+6OjTPw=",
-        "path": "/nix/store/89k711hq8f8j87h2kadz5kivkcpxjv58-source",
+        "path": "/nix/store/pp50jx20wrkbrkv3mxkwzckciy8xcqy2-source",
         "type": "path"
       },
       "original": {
-        "path": "/nix/store/89k711hq8f8j87h2kadz5kivkcpxjv58-source",
+        "path": "/nix/store/pp50jx20wrkbrkv3mxkwzckciy8xcqy2-source",
         "type": "path"
       }
     },

tests/flake.nix

@@ -211,6 +211,13 @@
                 lspkind.enable = true;
               };
             };
+
+            highlight = build {
+              options.termguicolors = true;
+              highlight = {
+                Normal.fg = "#ff0000";
+              };
+            };
           };
         })) // {
       nixosConfigurations.nixvim-machine = nixpkgs.lib.nixosSystem {