create-better-t-stack/apps/cli/src/prompts/examples.ts

import { cancel, isCancel, multiselect } from "@clack/prompts";
import pc from "picocolors";
import { DEFAULT_CONFIG } from "../constants";
import type { API, Backend, Database, Examples, Frontend } from "../types";
import {
	isExampleAIAllowed,
	isExampleTodoAllowed,
} from "../utils/compatibility-rules";

export async function getExamplesChoice(
	examples?: Examples[],
	database?: Database,
	frontends?: Frontend[],
	backend?: Backend,
	api?: API,
): Promise<Examples[]> {
	if (api === "none") {
		return [];
	}
	if (examples !== undefined) return examples;

	if (backend === "convex") {
		return ["todo"];
	}

	if (backend === "none") {
		return [];
	}

	if (database === "none") return [];

	const noFrontendSelected = !frontends || frontends.length === 0;

	if (noFrontendSelected) return [];

	let response: Examples[] | symbol = [];
	const options: { value: Examples; label: string; hint: string }[] = [];

	if (isExampleTodoAllowed(backend, database)) {
		options.push({
			value: "todo" as const,
			label: "Todo App",
			hint: "A simple CRUD example app",
		});
	}

	if (isExampleAIAllowed(backend, frontends ?? [])) {
		options.push({
			value: "ai" as const,
			label: "AI Chat",
			hint: "A simple AI chat interface using AI SDK",
		});
	}

	if (options.length === 0) return [];

	response = await multiselect<Examples>({
		message: "Include examples",
		options: options,
		required: false,
		initialValues: DEFAULT_CONFIG.examples?.filter((ex) =>
			options.some((o) => o.value === ex),
		),
	});

	if (isCancel(response)) {
		cancel(pc.red("Operation cancelled"));
		process.exit(0);
	}

	return response;
}