allow nodes to map over lists

execution.py

@@ -26,20 +26,74 @@ def get_input_data(inputs, class_def, unique_id, outputs={}, prompt={}, extra_da
             input_data_all[x] = obj
         else:
             if ("required" in valid_inputs and x in valid_inputs["required"]) or ("optional" in valid_inputs and x in valid_inputs["optional"]):
-                input_data_all[x] = input_data
+                input_data_all[x] = [input_data]
 
     if "hidden" in valid_inputs:
         h = valid_inputs["hidden"]
         for x in h:
             if h[x] == "PROMPT":
-                input_data_all[x] = prompt
+                input_data_all[x] = [prompt]
             if h[x] == "EXTRA_PNGINFO":
                 if "extra_pnginfo" in extra_data:
-                    input_data_all[x] = extra_data['extra_pnginfo']
+                    input_data_all[x] = [extra_data['extra_pnginfo']]
             if h[x] == "UNIQUE_ID":
-                input_data_all[x] = unique_id
+                input_data_all[x] = [unique_id]
     return input_data_all
 
+def get_output_data(obj, input_data_all):
+    
+    # check if node wants the lists
+    intput_is_list = False
+    if hasattr(obj, "INPUT_IS_LIST"):
+        intput_is_list = obj.INPUT_IS_LIST
+
+    max_len_input = max([len(x) for x in input_data_all.values()])
+    results = []
+    uis = []
+
+    # get a slice of inputs, repeat last input when list isn't long enough
+    def slice_dict(d, i):
+        d_new = dict()
+        for k,v in d.items():
+            d_new[k] = v[i if len(v) > i else -1]
+        return d_new
+    
+    def append_return(input):
+        nodes.before_node_execution()
+        node_result = getattr(obj, obj.FUNCTION)(**input)
+        if isinstance(node_result, dict):
+            if 'ui' in node_result:
+                uis.append(node_result['ui'])
+            if 'result' in node_result:
+                results.append(node_result['result'])
+        else:
+            results.append(node_result)
+    
+    if intput_is_list:
+        append_return(**input_data_all)
+    else: 
+        for i in range(max_len_input):
+            append_return(slice_dict(input_data_all, i))
+    
+    output = []
+    if len(results) > 0:
+        # check which outputs need concatenating
+        output_is_list = [False] * len(results[0])
+        if hasattr(obj, "OUTPUT_IS_LIST"):
+            output_is_list = obj.OUTPUT_IS_LIST
+
+        # merge node execution results
+        for i, is_list in zip(range(len(results[0])), output_is_list):
+            if is_list:
+                output.append([x for o in results for x in o[i]])
+            else:
+                output.append([o[i] for o in results])
+
+    ui = dict()    
+    if len(uis) > 0:
+        ui = {k: [y for x in uis for y in x[k]] for k in uis[0].keys()}
+    return output, ui
+
 def recursive_execute(server, prompt, outputs, current_item, extra_data, executed):
     unique_id = current_item
     inputs = prompt[unique_id]['inputs']
@@ -63,13 +117,11 @@ def recursive_execute(server, prompt, outputs, current_item, extra_data, execute
         server.send_sync("executing", { "node": unique_id }, server.client_id)
     obj = class_def()
 
-    nodes.before_node_execution()
-    outputs[unique_id] = getattr(obj, obj.FUNCTION)(**input_data_all)
-    if "ui" in outputs[unique_id]:
+    output_data, output_ui = get_output_data(obj, input_data_all)
+    outputs[unique_id] = output_data
+    if len(output_ui) > 0:
         if server.client_id is not None:
-            server.send_sync("executed", { "node": unique_id, "output": outputs[unique_id]["ui"] }, server.client_id)
-        if "result" in outputs[unique_id]:
-            outputs[unique_id] = outputs[unique_id]["result"]
+            server.send_sync("executed", { "node": unique_id, "output": output_ui }, server.client_id)
     executed.add(unique_id)
 
 def recursive_will_execute(prompt, outputs, current_item):