mirror of
https://github.com/debug-js/debug.git
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79b75ad626
Based off of the implemention from #67, except this one matches the Node.js colored output exactly, including the trailing `diff` value.
117 lines
2.0 KiB
JavaScript
117 lines
2.0 KiB
JavaScript
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/**
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* This is the web browser implementation of `debug()`.
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*
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* Expose `debug()` as the module.
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*/
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exports = module.exports = require('./debug');
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exports.log = log;
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exports.save = save;
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exports.load = load;
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/**
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* Colors.
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*/
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var colors = [
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'cyan',
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'green',
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'goldenrod', // "yellow" is just too bright on a white background...
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'blue',
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'purple',
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'red'
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];
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/**
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* Previously assigned color.
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*/
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var prevColor = 0;
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/**
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* Currently only WebKit-based Web Inspectors are known
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* to support "%c" CSS customizations.
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*/
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var useColors = 'WebkitAppearance' in document.documentElement.style;
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/**
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* Select a color.
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*
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* @return {Number}
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* @api private
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*/
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function selectColor() {
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return colors[prevColor++ % colors.length];
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}
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/**
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* Invokes `console.log()` when available.
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* No-op when `console.log` is not a "function".
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*
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* @api public
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*/
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function log(fmt) {
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var args = arguments;
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var curr = new Date();
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var ms = curr - (this.prev || curr);
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this.prev = curr;
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fmt = (useColors ? '%c' : '')
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+ this.namespace
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+ (useColors ? '%c ' : ' ')
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+ fmt
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+ (useColors ? '%c ' : ' ')
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+ '+' + exports.humanize(ms);
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if (useColors) {
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if (null == this.c) this.c = selectColor();
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var c = 'color: ' + this.c;
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args = [args[0], c, ''].concat(Array.prototype.slice.call(arguments, 1));
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args.push(c);
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}
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// This hackery is required for IE8,
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// where the `console.log` function doesn't have 'apply'
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return 'object' == typeof console
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&& 'function' == typeof console.log
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&& Function.prototype.apply.call(console.log, console, args);
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}
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/**
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* Save `namespaces`.
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*
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* @param {String} namespaces
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* @api private
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*/
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function save(namespaces) {
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try {
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localStorage.debug = namespaces;
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} catch(e) {}
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}
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/**
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* Load `namespaces`.
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*
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* @return {String} returns the previously persisted debug modes
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* @api private
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*/
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function load() {
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var r;
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try {
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r = localStorage.debug;
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} catch(e) {}
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return r;
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}
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/**
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* Enable namespaces listed in `localStorage.debug` initially.
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*/
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exports.enable(load());
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