node-debugger/src/index.js

a node debugger

var prev = {},
    prevColor = 0,
    sec = 1000,
    min = 60 * 1000,
    hour = 60 * min,
    colors = [
		32, // green
		33, // yellow
		34, // blue
		35, // magenta
		36, // cyan
		37, // white
		38,
	],
	others = [
        31, // red
        90, // grey
	];


function stylize(str, color) {
    if (color) return "\x1B[" + color + "m" + str + "\x1B[39m";
    return str;
}


function color() {
    return colors[prevColor++ % colors.length];
}


function humanize(ms) {
    var sec = 1000,
        min = 60 * 1000,
        hour = 60 * min;

    return (
        ms >= hour ? (ms / hour).toFixed(1) + "h" :
        ms >= min ? (ms / min).toFixed(1) + "m" :
        ms >= sec ? (ms / sec | 0) + "s" :
        ms + "ms"
    );
}


function debug(name) {
    var c = color();

    return function(fmt) {
        if (!debug.enabled && !debug[name]) return;
        var curr = new Date,
			font = others[1],
            ms = curr - (prev[name] || curr),
			tmp = c;

		if (fmt instanceof Error) {
			fmt = fmt.stack || fmt.message;
			font = c = others[0];
		}
        fmt = fmt instanceof Error ? fmt.stack || fmt.message : fmt;
			
        prev[name] = curr;
        fmt = "   " + stylize(name, c) + stylize(" - " + fmt, font) + stylize(" +" + humanize(ms), c);

        console.log.apply(console, arguments);
		c = tmp;
    }
};


debug.enabled = true;


module.exports = debug;