cli-loader/index.js

cli loader

'use strict';

module.exports = loader;

var lib = {
	basic: {
		frames: ['-', '\\', '|', '/'],
		interval: 50
	},
	'basic-reverse': {
		frames: ['-', '/', '|', '\\'],
		interval: 50
	},
	stack: {
		frames: ['▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'],
		interval: 200
	},
	arrow: {
		frames: ['>', '>>', '>>>', ''],
		interval: 200
	}
};

function loader(opts) {
	var id,
		spinner,
		stream = process.stdout;

	if (!opts) {
		spinner = lib.basic;
	} else if (typeof opts === 'string') {
		spinner = lib[opts] || lib.basic;
	} else if (typeof opts === 'object') {
		spinner = {
			frames: opts.frames || lib.basic.frames,
			interval: opts.interval || 50
		};
	}

	return {
		start: start,
		stop: stop
	};

	function start() {
		var frames = spinner.frames,
			len = frames.length,
			interval = spinner.interval,
			i = 0;

		clearInterval(id);
		id = setInterval(function() {
			stream.clearLine();
			stream.cursorTo(0);
			stream.write(frames[i++ % len]);
		}, interval);
	}

	function stop() {
		stream.clearLine();
		stream.cursorTo(0);
		clearInterval(id);
	}
}

loader.spinner = function(name) {
	return lib[name];
};