Christmas update: we celebrate Knut.

src/eressea/lua/eressea.cpp

@@ -226,10 +226,10 @@ is_function(struct lua_State * luaState, const char * fname)
 }
 
 static const char *
-get_season(void)
+get_season(int turnno)
 {
   gamedate gd;
-  get_gamedate(turn, &gd);
+  get_gamedate(turnno, &gd);
   return seasonnames[gd.season];
 }
 

src/scripts/eressea/xmas2006.lua

@@ -1,7 +1,7 @@
 function use_xmastree(u, amount)
   u.region:set_key("xm06", true)
   u:use_pooled("xmastree", amount)
-  msg = message("usepotion")
+  local msg = message("usepotion")
   msg:set_unit("unit", u)
   msg:set_resource("potion", "xmastree")
   msg:send_region(u.region)
@@ -9,10 +9,13 @@ function use_xmastree(u, amount)
 end
 
 function update_xmas2006()
-  season = get_season()
+  local turn = get_turn()
+  local season = get_season(turn)
   if season == "calendar::winter" then
     print("it is " .. season .. ", the christmas trees do their magic")
-    msg = message("xmastree_effect")
+    local msg = message("xmastree_effect")
+    local nextseason = get_season(turn-1)
+    local clear = (nextseason ~= "calendar::winter")
     for r in regions() do
       if r:get_key("xm06") then
         trees = r:get_resource("tree")
@@ -20,6 +23,10 @@ function update_xmas2006()
           r:set_resource("tree", trees * 1.1)
           msg:send_region(r)
         end
+        if clear then
+          -- we celebrate knut and kick out the trees.
+          r:set_key("xm06", false)
+        end
       end
     end
   end