expose a copy of the custom block as "caller" to input slot reaction …

…scripts inside custom block definitions

HISTORY.md

@@ -1,6 +1,11 @@
 # Snap! (BYOB) History
 
 ## in development:
+* **New Features:**
+    * expose a copy of the custom block as "caller" to input slot reaction scripts inside custom block definitions
+
+### 2024-11-11
+* threads: expose a copy of the custom block as "caller" to input slot reaction scripts inside custom block definitions
 
 ## 10.2.2:
 * **Notable Changes:**

snap.html

@@ -17,7 +17,7 @@
         <script src="src/symbols.js?version=2024-09-13"></script>
         <script src="src/widgets.js?version=2024-07-24"></script>
         <script src="src/blocks.js?version=2024-11-10"></script>
-        <script src="src/threads.js?version=2024-11-10"></script>
+        <script src="src/threads.js?version=2024-11-11"></script>
         <script src="src/objects.js?version=2024-11-10"></script>
         <script src="src/scenes.js?version=2024-05-28"></script>
         <script src="src/gui.js?version=2024-11-10"></script>

src/threads.js

@@ -65,7 +65,7 @@ StagePickerMorph, CustomBlockDefinition, CommentMorph, BooleanSlotMorph*/
 
 /*jshint esversion: 11, bitwise: false, evil: true*/
 
-modules.threads = '2024-November-10';
+modules.threads = '2024-November-11';
 
 var ThreadManager;
 var Process;
@@ -1983,6 +1983,12 @@ Process.prototype.mergeVariables = function () {
         Symbol.for('block'),
         this.context.expression.block // expression is an InputList
     );
+    // bind a copy of the block instance to "this caller"
+    // not entirely convinced about the benefits, but let's play with it
+    this.context.outerContext.variables.addVar(
+        Symbol.for('caller'),
+        this.context.expression.block.fullCopy().reify()
+    );
     this.context.expression.names.forEach((name, i) =>
         this.context.outerContext.variables.addVar(name, this.context.inputs[i])
     );