feat(nvim): nixify theming (and add 'vscode' theme)

home/modules/nvim/default.nix

@@ -1,15 +1,28 @@
 {
-  config,
-  lib,
-  pkgs,
   inputs,
+  pkgs,
+  lib,
+  config,
   ...
 }:
 
+let
+  themes = import "${inputs.nvim}/themes.nix" pkgs;
+  plugins = themes.${config.nvim.colorscheme};
+in
 {
-  options.nvim.enable = lib.mkEnableOption "nvim";
+  imports = [ inputs.nvim.homeModules.default ];
+
+  options.nvim.colorscheme = lib.mkOption {
+    type = lib.types.enum (lib.attrNames themes);
+    default = "zenwritten";
+  };
 
   config = lib.mkIf config.nvim.enable {
+    nvim.packageDefinitions.merge.nvim = _: {
+      categories.colorscheme = config.nvim.colorscheme;
+    };
+
     home = {
       sessionVariables = {
         EDITOR = "nvim";
@@ -19,10 +32,21 @@
         PAGER = "nvimpager";
         MANWIDTH = "80";
       };
-      packages = with pkgs; [
-        inputs.nvim.packages.${pkgs.stdenv.hostPlatform.system}.nvim
-        nvimpager
-      ];
+      packages = with pkgs; [ nvimpager ];
     };
+
+    xdg.configFile =
+      lib.listToAttrs (
+        map (
+          package: lib.nameValuePair "nvimpager/pack/themes/opt/${package.pname}" { source = package; }
+        ) plugins
+      )
+      // {
+        "nvimpager/init.lua".text = ''
+          vim.g.theme = "${config.nvim.colorscheme}"
+          vim.g.theme_packs = ${lib.generators.toLua { } (map (package: package.pname) plugins)}
+          dofile("${./nvimpager.lua}")
+        '';
+      };
   };
 }