interfaces and package config externalized, also tmux added and version variable

wireguard.nix

@@ -1,8 +1,8 @@
-{ config, pkgs, ... }: {
+{ config, lib, pkgs, ... }: {
 
   networking.nat.enable = true;
-  networking.nat.externalInterface = "enp1s0";
-  networking.nat.internalInterfaces = [ "wg0" ];
+  networking.nat.externalInterface = lib.head config.vars.interfaces;
+  networking.nat.internalInterfaces = [ "wg0" ] ++ config.vars.interfaces;
   
   networking.wg-quick.interfaces = {
     wg0 = {
@@ -11,11 +11,11 @@
       autostart = true;
       postUp = ''
         ${pkgs.iptables}/bin/iptables -A FORWARD -i wg0 -j ACCEPT
-        ${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -o enp1s0 -j MASQUERADE
+        ${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -o ${lib.head config.vars.interfaces} -j MASQUERADE
       '';
       postDown = ''
         ${pkgs.iptables}/bin/iptables -D FORWARD -i wg0 -j ACCEPT
-        ${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -o enp1s0
+        ${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -o ${lib.head config.vars.interfaces}
       '';
       privateKey = config.vars.wg_privateKey;
       peers = [{
@@ -27,5 +27,6 @@
       }];
     };
   };
-}
 
+  environment.systemPackages = [ pkgs.wireguard-tools ];
+}