my-pi/extensions/bash-override.ts

import {
	createBashToolDefinition,
	type ExtensionAPI,
	getAgentDir,
	SettingsManager,
} from "@earendil-works/pi-coding-agent";
import { guardExtensionApi } from "./prompt-guard.ts";

type BashDefinition = ReturnType<typeof createBashToolDefinition>;

/** Re-register Pi's bash so tools.jsonc can append to its model-facing description; execution stays upstream. */
export default function bashOverrideExtension(pi: ExtensionAPI): void {
	const sessionDefinitions = new Map<string, BashDefinition>();
	const sessionDefinition = (cwd: string): BashDefinition => {
		let definition = sessionDefinitions.get(cwd);
		if (definition === undefined) {
			const settings = SettingsManager.create(cwd, getAgentDir());
			definition = createBashToolDefinition(cwd, {
				shellPath: settings.getShellPath(),
				commandPrefix: settings.getShellCommandPrefix(),
			});
			sessionDefinitions.set(cwd, definition);
		}
		return definition;
	};

	guardExtensionApi(pi).registerTool({
		...sessionDefinition(process.cwd()),
		execute: (toolCallId, params, signal, onUpdate, ctx) =>
			sessionDefinition(ctx?.cwd ?? process.cwd()).execute(
				toolCallId,
				params,
				signal,
				onUpdate,
				ctx,
			),
	});
}