continuously set/update chat variable $$player_oxygen_seconds

src/chat.rs

@@ -79,6 +79,7 @@ impl Plugin for ChatPlugin {
                 handle_new_conversations.before(handle_chat_events),
                 handle_chat_events.before(handle_chat_scripts),
                 handle_chat_scripts,
+                update_chat_variables,
             ),
         );
         app.add_event::<StartConversationEvent>();
@@ -939,3 +940,12 @@ pub fn handle_chat_scripts(
         }
     }
 }
+
+pub fn update_chat_variables(
+    mut vars: ResMut<var::GameVars>,
+    q_player: Query<&actor::Suit, With<actor::Player>>,
+) {
+    if let Ok(suit) = q_player.get_single() {
+        vars.set_in_scope("$", "player_oxygen_seconds", (suit.oxygen / nature::OXY_S).to_string());
+    }
+}