theme/grubber-darker: add grubber-darker theme, which is inspired by tsodings emacs theme

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

@@ -172,6 +172,9 @@
 
 - Added [`golangci-lint`](https://golangci-lint.run/) for more diagnostics.
 
+- Added neovim theme `gruber-darker`
+  <https://github.com/blazkowolf/gruber-darker.nvim>.
+
 [vagahbond](https://github.com/vagahbond): [codewindow.nvim]:
 https://github.com/gorbit99/codewindow.nvim
 

modules/plugins/theme/supported-themes.nix

@@ -37,6 +37,33 @@ in {
     '';
     styles = ["dark" "darker" "cool" "deep" "warm" "warmer"];
   };
+  gruber-darker = {
+    setup = _:
+    /*
+    lua
+    */
+    ''
+      require('gruber-darker').setup({
+        -- defaults
+        bold = true,
+        invert = {
+          signs = false,
+          tabline = false,
+          visual = false,
+        },
+        italic = {
+          strings = true,
+          comments = true,
+          operators = false,
+          folds = true,
+        },
+        undercurl = true,
+        underline = true,
+      })
+      vim.cmd('colorscheme gruber-darker')
+    '';
+    styles = ["dark"];
+  };
 
   tokyonight = {
     setup = {

npins/sources.json

@@ -643,6 +643,19 @@
       "url": "https://github.com/ellisonleao/glow.nvim/archive/5d5954b2f22e109d4a6eba8b2618c5b96e4ee7a2.tar.gz",
       "hash": "sha256-CvBcmVWBgI+m+PS7p7PmsiPtTEfqx2kpIzz4mImONIc="
     },
+    "gruber-darker": {
+      "type": "Git",
+      "repository": {
+        "type": "GitHub",
+        "owner": "blazkowolf",
+        "repo": "gruber-darker.nvim"
+      },
+      "branch": "main",
+      "submodules": false,
+      "revision": "aba065c3a79b58cc3863d5c9db319255abd1258a",
+      "url": "https://github.com/blazkowolf/gruber-darker.nvim/archive/aba065c3a79b58cc3863d5c9db319255abd1258a.tar.gz",
+      "hash": "sha256-4xB/MRTDccA5gTKe6DrN+bNfDx6fzjuIGOLdkuxg8c0="
+    },
     "gruvbox": {
       "type": "Git",
       "repository": {