Adding built in extensions + example

web/extensions/core/dynamicPrompts.js

@@ -0,0 +1,40 @@
+import { app } from "../../scripts/app.js";
+
+// Allows for simple dynamic prompt replacement
+// Inputs in the format {a|b} will have a random value of a or b chosen when the prompt is queued.
+
+app.registerExtension({
+	name: "Comfy.DynamicPrompts",
+	nodeCreated(node) {
+		// TODO: Change this to replace the value and restore it after posting
+
+
+		if (node.widgets) {
+			// Locate dynamic prompt text widgets
+			// Include any widgets with dynamicPrompts set to true, and customtext
+			const widgets = node.widgets.filter(
+				(n) => (n.type === "customtext" && n.dynamicPrompts !== false) || n.dynamicPrompts
+			);
+			for (const widget of widgets) {
+				// Override the serialization of the value to resolve dynamic prompts for all widgets supporting it in this node
+				widget.serializeValue = () => {
+					let prompt = widget.value;
+					while (prompt.replace("\\{", "").includes("{") && prompt.replace("\\}", "").includes("}")) {
+						const startIndex = prompt.replace("\\{", "00").indexOf("{");
+						const endIndex = prompt.replace("\\}", "00").indexOf("}");
+
+						const optionsString = prompt.substring(startIndex + 1, endIndex);
+						const options = optionsString.split("|");
+
+						const randomIndex = Math.floor(Math.random() * options.length);
+						const randomOption = options[randomIndex];
+
+						prompt = prompt.substring(0, startIndex) + randomOption + prompt.substring(endIndex + 1);
+					}
+
+					return prompt;
+				};
+			}
+		}
+	},
+});