term-size/index.js

Reliably get the terminal window size (columns & rows)

import process from 'node:process';
import {execFileSync} from 'node:child_process';
import path from 'node:path';
import {fileURLToPath} from 'node:url';

const exec = (command, arguments_, shell) =>
	execFileSync(command, arguments_, {encoding: 'utf8', shell, stdio: ['ignore', 'pipe', 'ignore']}).trim();

function execNative(command, shell) {
	const __dirname = path.dirname(fileURLToPath(import.meta.url));
	return exec(path.join(__dirname, command), [], shell).split(/\r?\n/);
}

const create = (columns, rows) => ({
	columns: Number.parseInt(columns, 10),
	rows: Number.parseInt(rows, 10),
});

export default function terminalSize() {
	const {env, stdout, stderr} = process;

	if (stdout && stdout.columns && stdout.rows) {
		return create(stdout.columns, stdout.rows);
	}

	if (stderr && stderr.columns && stderr.rows) {
		return create(stderr.columns, stderr.rows);
	}

	// These values are static, so not the first choice
	if (env.COLUMNS && env.LINES) {
		return create(env.COLUMNS, env.LINES);
	}

	if (process.platform === 'win32') {
		try {
			// Binary: https://github.com/sindresorhus/win-term-size
			const size = execNative('vendor/windows/term-size.exe', false);

			if (size.length === 2) {
				return create(size[0], size[1]);
			}
		} catch {}
	} else {
		if (process.platform === 'darwin') {
			try {
				// Binary: https://github.com/sindresorhus/macos-term-size
				const size = execNative('vendor/macos/term-size', true);

				if (size.length === 2) {
					return create(size[0], size[1]);
				}
			} catch {}
		}

		// `resize` is preferred as it works even when all file descriptors are redirected
		// https://linux.die.net/man/1/resize
		try {
			const size = exec('resize', ['-u']).match(/\d+/g);

			if (size.length === 2) {
				return create(size[0], size[1]);
			}
		} catch {}

		if (process.env.TERM) {
			try {
				const columns = exec('tput', ['cols']);
				const rows = exec('tput', ['lines']);

				if (columns && rows) {
					return create(columns, rows);
				}
			} catch {}
		}
	}

	return create(80, 24);
}