modularize waybar config, TODO: styles

modules/waybar/vpn.nix

@@ -0,0 +1,19 @@
+{ lib, config, ... }:
+let 
+  name = "custom/vpn";
+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}" = {
+      format = "VPN";
+      exec = "echo '{\"class\": \"connected\"}'";
+      exec-if = "test -d /proc/sys/net/ipv4/conf/tun0";
+      return-type = "json";
+      interval = 5;
+    };
+  };
+}