printHelp() — astro Function Reference

Architecture documentation for the printHelp() function in messages.ts from the astro codebase.

Function typescript CoreAstro RoutingSystem calls 1

Entity Profile

CoreAstro→ RoutingSystem→ printHelp() — astro Function Reference

Dependency Diagram

graph TD
  3bfc0f98_a98d_29d7_e47c_66152f1b568d["printHelp()"]
  d28938aa_d420_d4d1_6b36_01f3df03707d["messages.ts"]
  3bfc0f98_a98d_29d7_e47c_66152f1b568d -->|defined in| d28938aa_d420_d4d1_6b36_01f3df03707d
  ac3298d6_0c78_5a80_8fb7_ec8acfacd90c["log()"]
  3bfc0f98_a98d_29d7_e47c_66152f1b568d -->|calls| ac3298d6_0c78_5a80_8fb7_ec8acfacd90c
  style 3bfc0f98_a98d_29d7_e47c_66152f1b568d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/upgrade/src/messages.ts lines 169–220

export function printHelp({
	commandName,
	usage,
	tables,
	description,
}: {
	commandName: string;
	headline?: string;
	usage?: string;
	tables?: Record<string, [command: string, help: string][]>;
	description?: string;
}) {
	const linebreak = () => '';
	const table = (rows: [string, string][], { padding }: { padding: number }) => {
		const split = stdout.columns < 60;
		let raw = '';

		for (const row of rows) {
			if (split) {
				raw += `    ${row[0]}\n    `;
			} else {
				raw += `${`${row[0]}`.padStart(padding)}`;
			}
			raw += '  ' + color.dim(row[1]) + '\n';
		}

		return raw.slice(0, -1); // remove latest \n
	};

	let message = [];

	if (usage) {
		message.push(linebreak(), `${color.green(commandName)} ${color.bold(usage)}`);
	}

	if (tables) {
		function calculateTablePadding(rows: [string, string][]) {
			return rows.reduce((val, [first]) => Math.max(val, first.length), 0);
		}
		const tableEntries = Object.entries(tables);
		const padding = Math.max(...tableEntries.map(([, rows]) => calculateTablePadding(rows)));
		for (const [, tableRows] of tableEntries) {
			message.push(linebreak(), table(tableRows, { padding }));
		}
	}

	if (description) {
		message.push(linebreak(), `${description}`);
	}

	log(message.join('\n') + '\n');
}