init.ts

import * as path from 'path';
import * as argopts from 'cli';

const HelpMessage = `Initialize a new Wren project. 

USAGE:
    deno run -A -r https://wren.deno.dev <DIRECTORY>

OPTIONS:
    --vscode  setup this Wren project for VSCode
`;

const template = (name: string) => (element: string) =>
	`https://raw.githubusercontent.com/zaiste/wren/main/examples/${name}/${element}`;

const templates = {
	// FIXME automate with GitHub API
	bare: ['README.md', 'deno.json', 'import_map.json', 'main.ts', 'justfile'],
};

const download = async (url: string, path: string) => {
	const response = await fetch(url);
	const text = await response.text();

	Deno.writeTextFile(path, text);
};

const error = (message: string) => {
	console.error(`%cerror%c: ${message}`, 'color: red; font-weight: bold', '');
	Deno.exit(1);
};

const flags = argopts.parse(Deno.args, {
	boolean: ['vscode'],
	default: { 'vscode': null },
});

if (flags._.length !== 1) {
	error(HelpMessage);
}

console.log(
	`\n%c 🪶  Wren  %c`,
	'background-color: #d8cbc4; color: black; font-weight: bold',
	'',
);
console.log('A small, but powerful HTTP library built for convenience and simplicity');

const projectName = Deno.args[0];
const projectPath = path.resolve(projectName);

try {
	const dir = [...Deno.readDirSync(projectPath)];
	const isEmpty = dir.length === 0 ||
		dir.length === 1 && dir[0].name === '.git';
	if (!isEmpty) {
		error('Directory is not empty.');
	}
} catch (err) {
	if (!(err instanceof Deno.errors.NotFound)) {
		throw err;
	}
}

await Deno.mkdir(projectName, { recursive: true });

const input = 'bare';
for (const el of templates[input]) {
	await download(template(input)(el), path.join(projectName, el));
}

if (flags.vscode) {
	await Deno.mkdir(path.join(projectPath, '.vscode'), { recursive: true });

	const VSCodeSettings = {
		'deno.enable': true,
		'deno.lint': true,
		'editor.defaultFormatter': 'denoland.vscode-deno',
	};

	await Deno.writeTextFile(
		path.join(projectPath, '.vscode', 'settings.json'),
		JSON.stringify(VSCodeSettings, null, 2) + '\n',
	);

	const VSCodeExtensions = {
		recommendations: ['denoland.vscode-deno'],
	};

	await Deno.writeTextFile(
		path.join(projectPath, '.vscode', 'extensions.json'),
		JSON.stringify(VSCodeExtensions, null, 2) + '\n',
	);
}

console.log('\n%cProject initialized.\n', 'color: green; font-weight: bold');
console.log(
	`Enter the project directory using %ccd ${projectName}%c.`,
	'color: cyan',
	'',
);
console.log(
	'Run %cdeno task start%c to start the project. %cCTRL-C%c to stop.',
	'color: cyan',
	'',
	'color: cyan',
	'',
);