125 lines
2.2 KiB
JavaScript
125 lines
2.2 KiB
JavaScript
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/**
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* Expose `debug()` as the module.
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*/
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module.exports = debug;
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/**
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* Create a debugger with the given `name`.
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*
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* @param {String} name
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* @return {Type}
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* @api public
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*/
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function debug(name) {
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if (!debug.enabled(name)) return function(){};
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return function(fmt){
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var curr = new Date;
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var ms = curr - (debug[name] || curr);
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debug[name] = curr;
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fmt = name
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+ ' '
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+ fmt
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+ ' +' + debug.humanize(ms);
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// This hackery is required for IE8
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// where `console.log` doesn't have 'apply'
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window.console
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&& console.log
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&& Function.prototype.apply.call(console.log, console, arguments);
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}
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}
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/**
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* The currently active debug mode names.
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*/
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debug.names = [];
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debug.skips = [];
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/**
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* Enables a debug mode by name. This can include modes
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* separated by a colon and wildcards.
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*
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* @param {String} name
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* @api public
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*/
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debug.enable = function(name) {
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try {
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localStorage.debug = name;
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} catch(e){}
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var split = (name || '').split(/[\s,]+/)
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, len = split.length;
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for (var i = 0; i < len; i++) {
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name = split[i].replace('*', '.*?');
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if (name[0] === '-') {
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debug.skips.push(new RegExp('^' + name.substr(1) + '$'));
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}
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else {
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debug.names.push(new RegExp('^' + name + '$'));
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}
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}
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};
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/**
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* Disable debug output.
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*
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* @api public
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*/
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debug.disable = function(){
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debug.enable('');
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};
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/**
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* Humanize the given `ms`.
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*
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* @param {Number} m
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* @return {String}
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* @api private
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*/
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debug.humanize = function(ms) {
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var sec = 1000
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, min = 60 * 1000
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, hour = 60 * min;
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if (ms >= hour) return (ms / hour).toFixed(1) + 'h';
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if (ms >= min) return (ms / min).toFixed(1) + 'm';
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if (ms >= sec) return (ms / sec | 0) + 's';
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return ms + 'ms';
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};
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/**
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* Returns true if the given mode name is enabled, false otherwise.
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*
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* @param {String} name
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* @return {Boolean}
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* @api public
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*/
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debug.enabled = function(name) {
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for (var i = 0, len = debug.skips.length; i < len; i++) {
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if (debug.skips[i].test(name)) {
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return false;
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}
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}
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for (var i = 0, len = debug.names.length; i < len; i++) {
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if (debug.names[i].test(name)) {
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return true;
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}
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}
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return false;
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};
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// persist
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if (window.localStorage) debug.enable(localStorage.debug);
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