Function progress

packages/prompts/src/progress-bar.ts:22–73

({
	style = 'heavy',
	max: userMax = 100,
	size: userSize = 40,
	...spinnerOptions
}: ProgressOptions = {})

}

export function progress({
	style = 'heavy',
	max: userMax = 100,
	size: userSize = 40,
	...spinnerOptions
}: ProgressOptions = {}): ProgressResult {
	const spin = spinner(spinnerOptions);
	let value = 0;
	let previousMessage = '';

	const max = Math.max(1, userMax);
	const size = Math.max(1, userSize);

	const activeStyle = (state: State) => {
		switch (state) {
			case 'initial':
			case 'active':
				return (text: string) => styleText('magenta', text);
			case 'error':
			case 'cancel':
				return (text: string) => styleText('red', text);
			case 'submit':
				return (text: string) => styleText('green', text);
			default:
				return (text: string) => styleText('magenta', text);
		}
	};
	const drawProgress = (state: State, msg: string) => {
		const active = Math.floor((value / max) * size);
		return `${activeStyle(state)(S_PROGRESS_CHAR[style].repeat(active))}${styleText('dim', S_PROGRESS_CHAR[style].repeat(size - active))} ${msg}`;
	};

	const start = (msg = '') => {
		previousMessage = msg;
		spin.start(drawProgress('initial', msg));
	};
	const advance = (step = 1, msg?: string): void => {
		value = Math.min(max, step + value);
		spin.message(drawProgress('active', msg ?? previousMessage));
		previousMessage = msg ?? previousMessage;
	};
	return {
		start,
		stop: spin.stop,
		cancel: spin.cancel,
		error: spin.error,
		clear: spin.clear,
		advance,
		isCancelled: spin.isCancelled,
		message: (msg: string) => advance(0, msg),
	};
}