Bows - custom inspect method for printing time diff

bows-custom-inspect.js

(function() {
	function checkColorSupport() {
		if (typeof window === 'undefined' || typeof navigator === 'undefined') {
			return false;
		}
		var chrome = !!window.chrome,
			firefox = /firefox/i.test(navigator.userAgent),
			firefoxVersion;

		if (firefox) {
			var match = navigator.userAgent.match(/Firefox\/(\d+\.\d+)/);
			if (match && match[1] && Number(match[1])) {
				firefoxVersion = Number(match[1]);
			}
		}
		return chrome || firefoxVersion >= 31.0;
	}

	var yieldColor = function() {
		var goldenRatio = 0.618033988749895;
		hue += goldenRatio;
		hue = hue % 1;
		return hue * 360;
	};

	var inNode = typeof window === 'undefined',
		ls = !inNode && window.localStorage,
		debugKey = ls.andlogKey || 'debug',
		debug = ls[debugKey],
		logger = require('andlog'),
		bind = Function.prototype.bind,
		hue = 0,
		padLength = 15,
		noop = function() {},
		colorsSupported = ls.debugColors || checkColorSupport(),
		bows = null,
		debugRegex = null,
		invertRegex = false,
		moduleColorsMap = {};

	if (debug && debug[0] === '!' && debug[1] === '/') {
		invertRegex = true;
		debug = debug.slice(1);
	}
	debugRegex = debug && debug[0] === '/' && new RegExp(debug.substring(1, debug.length - 1));

	var logLevels = ['log', 'debug', 'warn', 'error', 'info'];

	//Noop should noop
	for (var i = 0, ii = logLevels.length; i < ii; i++) {
		noop[logLevels[i]] = noop;
	}

	var lastInvokedAt;

	diff = function() {
		var now = Date.now();

		var diff = now - (lastInvokedAt || now);
		lastInvokedAt = now;

		return '+' + diff + 'ms';
	};

	bows = function(str) {
		var msg, colorString, logfn;
		msg = (str.slice(0, padLength));
		msg += Array(padLength + 3 - msg.length).join(' ');

		if (debugRegex) {
			var matches = str.match(debugRegex);
			if (
				(!invertRegex && !matches) ||
				(invertRegex && matches)
			) return noop;
		}

		if (!bind) return noop;

		var logArgs = [logger];
		if (colorsSupported) {
			if (!moduleColorsMap[str]) {
				moduleColorsMap[str] = yieldColor();
			}
			var color = moduleColorsMap[str];
			msg = "%c" + msg;
			colorString = "color: hsl(" + (color) + ",99%,40%); font-weight: bold";

			logArgs.push(msg, colorString);
		} else {
			logArgs.push(msg);
		}

		if (arguments.length > 1) {
			var args = Array.prototype.slice.call(arguments, 1);
			logArgs = logArgs.concat(args);
		}

		function TimeDiff() {};
		TimeDiff.prototype.inspect = function() {
			return diff();
		};
		logArgs.push(new TimeDiff());
		logArgs.push('|');

		logfn = bind.apply(logger.log, logArgs);

		logLevels.forEach(function(f) {
			logfn[f] = bind.apply(logger[f] || logfn, logArgs);
		});
		return logfn;
	};

	bows.config = function(config) {
		if (config.padLength) {
			padLength = config.padLength;
		}
	};

	if (typeof module !== 'undefined') {
		module.exports = bows;
	} else {
		window.bows = bows;
	}
}).call();