events are added on the fly as source loads

src/main/java/carpet/script/CarpetEventServer.java

@@ -133,6 +133,19 @@ public class CarpetEventServer
             callList.add(new Callback(hostName, udf));
             return true;
         }
+        public boolean addEventCallDirect(ScriptHost host, FunctionValue function)
+        {
+            if (function == null || function.getArguments().size() != reqArgs)
+            {
+                return false;
+            }
+            //all clear
+            //remove duplicates
+            removeEventCall(host.getName(), function.getString());
+            callList.add(new Callback(host.getName(), function));
+            return true;
+        }
+
         public void removeEventCall(String hostName, String funName)
         {
             callList.removeIf((c)->  c.udf.getString().equals(funName) && ( hostName == null || c.host.equalsIgnoreCase(hostName) ) );
@@ -461,6 +474,11 @@ public class CarpetEventServer
         return Event.byName.get(event).handler.addEventCall(host, funName);
     }
 
+    public boolean addEventDirectly(String event, ScriptHost host, FunctionValue function)
+    {
+        return Event.byName.get(event).handler.addEventCallDirect(host, function);
+    }
+
     public boolean removeEvent(String event, String funName)
     {
 

src/main/java/carpet/script/CarpetScriptServer.java

@@ -131,7 +131,7 @@ public class CarpetScriptServer
 
     private ScriptHost createMinecraftScriptHost(String name, ModuleInterface module, boolean perPlayer, ServerCommandSource source)
     {
-        ScriptHost host = new ScriptHost(name, module, perPlayer, null );
+        ScriptHost host = new ScriptHost(this, name, module, perPlayer, null );
         host.globalVariables.put("_x", (c, t) -> Value.ZERO);
         host.globalVariables.put("_y", (c, t) -> Value.ZERO);
         host.globalVariables.put("_z", (c, t) -> Value.ZERO);
@@ -192,7 +192,7 @@ public class CarpetScriptServer
             removeScriptHost(source, name);
             return false;
         }
-        addEvents(source, name);
+        //addEvents(source, name);
         addCommand(source, name);
         return true;
     }
@@ -220,6 +220,7 @@ public class CarpetScriptServer
     }
     private void addEvents(ServerCommandSource source, String hostName)
     {
+        if (1+2 == 3) throw new RuntimeException("This should run when code is evaluated");
         ScriptHost host = modules.get(hostName);
         if (host == null)
         {

src/main/java/carpet/script/Expression.java

@@ -680,7 +680,7 @@ public class Expression implements Cloneable
 
         FunctionValue result =  new FunctionValue(expr, token, name, code, arguments, contextValues);
         // do not store lambda definitions
-        if (!name.equals("_")) context.host.globalFunctions.put(name, result);
+        if (!name.equals("_")) context.host.addUserDefinedFunction(name, result);
         return result;
     }
 

src/main/java/carpet/script/ScriptHost.java

@@ -45,7 +45,9 @@ public class ScriptHost
     private final ModuleInterface myCode;
     private boolean perUser;
 
-    ScriptHost(String name, ModuleInterface code, boolean perUser, ScriptHost parent)
+    private CarpetScriptServer scriptServer;
+
+    ScriptHost(CarpetScriptServer server, String name, ModuleInterface code, boolean perUser, ScriptHost parent)
     {
         this.saveTimeout = 0;
         this.parent = parent;
@@ -65,6 +67,23 @@ public class ScriptHost
 
         if (parent == null && name != null)
             globalState = loadState();
+
+        this.scriptServer = server;
+    }
+
+    public void addUserDefinedFunction(String funName, FunctionValue function)
+    {
+        // generic
+        globalFunctions.put(funName, function);
+        // mcarpet
+        if (funName.startsWith("__on_"))
+        {
+            // this is nasty, we have the host and function, yet we add it via names, but hey - works for now
+            String event = funName.replaceFirst("__on_","");
+            if (CarpetEventServer.Event.byName.containsKey(event))
+                scriptServer.events.addEventDirectly(event, this, function);
+        }
+
     }
 
     private ScriptHost retrieveForExecution(String /*Nullable*/ user)
@@ -74,7 +93,7 @@ public class ScriptHost
         ScriptHost userHost = userHosts.get(user);
         if (userHost != null)
             return userHost;
-        userHost = new ScriptHost(this.name, myCode, false, this);
+        userHost = new ScriptHost(this.scriptServer, this.name, myCode, false, this);
         userHost.globalVariables.putAll(this.globalVariables);
         userHost.globalFunctions.putAll(this.globalFunctions);
         userHosts.put(user, userHost);