change process_one virtual function for script to process_batch, add extra args and docs

modules/processing.py

@@ -502,7 +502,7 @@ def process_images_inner(p: StableDiffusionProcessing) -> Processed:
                 break
 
             if p.scripts is not None:
-                p.scripts.process_one(p, n)
+                p.scripts.process_batch(p, batch_number=n, prompts=prompts, seeds=seeds, subseeds=subseeds)
 
             with devices.autocast():
                 uc = prompt_parser.get_learned_conditioning(shared.sd_model, len(prompts) * [p.negative_prompt], p.steps)

modules/scripts.py

@@ -73,9 +73,15 @@ class Script:
 
         pass
 
-    def process_one(self, p, n, *args):
+    def process_batch(self, p, *args, **kwargs):
         """
-        Same as process(), but called for every iteration
+        Same as process(), but called for every batch.
+
+        **kwargs will have those items:
+          - batch_number - index of current batch, from 0 to number of batches-1
+          - prompts - list of prompts for current batch; you can change contents of this list but changing the number of entries will likely break things
+          - seeds - list of seeds for current batch
+          - subseeds - list of subseeds for current batch
         """
 
         pass
@@ -303,13 +309,13 @@ class ScriptRunner:
                 print(f"Error running process: {script.filename}", file=sys.stderr)
                 print(traceback.format_exc(), file=sys.stderr)
 
-    def process_one(self, p, n):
+    def process_batch(self, p, **kwargs):
         for script in self.alwayson_scripts:
             try:
                 script_args = p.script_args[script.args_from:script.args_to]
-                script.process_one(p, n, *script_args)
+                script.process_batch(p, *script_args, **kwargs)
             except Exception:
-                print(f"Error running process_one: {script.filename}", file=sys.stderr)
+                print(f"Error running process_batch: {script.filename}", file=sys.stderr)
                 print(traceback.format_exc(), file=sys.stderr)
 
     def postprocess(self, p, processed):