start to think about event model

marmots_todo.txt

@@ -1,3 +1,5 @@
+- listen to many events at once (required for vm, very useful to do away with awkward oob pattern most places)
+
 debugging output:
 - decorate classes which we expect not to be in the output, warn if we persist them
 - 
@@ -8,5 +10,3 @@ TRef
     
     -- we do not want to hold on to references
         -- actually in our case we don't want to save GameWBs at all, we want to persist boards lazily (except for metadata?)
-Cldg
-    -- well, this sucks :P  guid?  attach to game?

scripting.py

@@ -437,6 +437,20 @@ class SyntSet(SyntDesc):
         if not isinstance(val, Fail):
             vm.Log(vm.vars.Set(self.lvalue.syntVar, vm.Pop(), self))
 
+class SyntWhen(SyntDesc):
+    desc = [["When"], " ", (SyntEvent, 1), ":", (SyntBlock, 2)]
+
+class SyntEvent(SyntDesc):
+    rgclsSyntEvent = []
+    desc = [["     "]]
+    @classmethod
+    def RgsyntReplace(cls, syntChild, st, rtype):
+        for clsSyntEvent in cls.rgclsSyntEvent:
+            if clsSyntEvent.StForTypein().lower().startswith(st.lower()):
+                yield clsSyntEvent.SyntDefault()
+        for synt in SyntExpr.RgsyntReplace(syntChild, st, rtype):
+            yield synt
+
 #debug
 @RegStmt
 class SyntPrint(SyntDesc):