extensions!

pi/files/agent/extensions/confirm-destructive.ts

@@ -0,0 +1,59 @@
+/**
+ * Confirm Destructive Actions Extension
+ *
+ * Prompts for confirmation before destructive session actions (clear, switch, branch).
+ * Demonstrates how to cancel session events using the before_* events.
+ */
+
+import type { ExtensionAPI, SessionBeforeSwitchEvent, SessionMessageEntry } from "@mariozechner/pi-coding-agent";
+
+export default function (pi: ExtensionAPI) {
+	pi.on("session_before_switch", async (event: SessionBeforeSwitchEvent, ctx) => {
+		if (!ctx.hasUI) return;
+
+		if (event.reason === "new") {
+			const confirmed = await ctx.ui.confirm(
+				"Clear session?",
+				"This will delete all messages in the current session.",
+			);
+
+			if (!confirmed) {
+				ctx.ui.notify("Clear cancelled", "info");
+				return { cancel: true };
+			}
+			return;
+		}
+
+		// reason === "resume" - check if there are unsaved changes (messages since last assistant response)
+		const entries = ctx.sessionManager.getEntries();
+		const hasUnsavedWork = entries.some(
+			(e): e is SessionMessageEntry => e.type === "message" && e.message.role === "user",
+		);
+
+		if (hasUnsavedWork) {
+			const confirmed = await ctx.ui.confirm(
+				"Switch session?",
+				"You have messages in the current session. Switch anyway?",
+			);
+
+			if (!confirmed) {
+				ctx.ui.notify("Switch cancelled", "info");
+				return { cancel: true };
+			}
+		}
+	});
+
+	pi.on("session_before_fork", async (event, ctx) => {
+		if (!ctx.hasUI) return;
+
+		const choice = await ctx.ui.select(`Fork from entry ${event.entryId.slice(0, 8)}?`, [
+			"Yes, create fork",
+			"No, stay in current session",
+		]);
+
+		if (choice !== "Yes, create fork") {
+			ctx.ui.notify("Fork cancelled", "info");
+			return { cancel: true };
+		}
+	});
+}