start migrating waybar to modularity

modules/waybar/clock.nix

@@ -0,0 +1,29 @@
+{ lib, config, pkgs, ... }:
+let 
+  name = "clock";
+in
+{
+  options.modules.waybar.modules = import ./addname.nix lib name;
+  options.modules.waybar.${name} = {
+    enable = lib.mkEnableOption "enable ${name} waybar module";
+  };
+  config = lib.mkIf config.modules.waybar.${name}.enable {
+    programs.waybar.settings.mainbar.${name} = {
+      tooltip-format = "<big>{:%Y %B}</big>\n\n{calendar}";
+      interval = 1;
+      format = "{:%H:%M:%S}";
+      format-alt = "{:%Y-%m-%d %H:%M:%S}";
+      on-click-middle = "gnome-clocks";
+      calendar = {
+        weeks-pos = "left";
+        format = {
+          today = "<span color='#FF6666'><u>{}</u></span>"; # TODO: use nix-colors
+          weeks = "<span color='#707A8C'>{}</span>"; # TODO: use nix-colors
+        };
+      };
+      home.packages = [
+        pkgs.gnome.gnome-clocks
+      ];
+    };
+  };
+}