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3aa365ae93
On Node.js, if you set a process.env field to either null or undefined, it gets cast to string 'null' or 'undefined'. For debug, this means that if you don't have DEBUG set, it will get set to the string 'undefined'. There are other modules (like node-rest-client) which use the DEBUG environment variable that will start spewing debug output when you don't want it to.
112 lines
2.1 KiB
JavaScript
112 lines
2.1 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var tty = require('tty');
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var util = require('util');
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/**
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* This is the Node.js 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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exports.useColors = useColors;
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/**
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* Colors.
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*/
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exports.colors = [6, 2, 3, 4, 5, 1];
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/**
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* Is stdout a TTY? Colored output is enabled when `true`.
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*/
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function useColors() {
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var debugColors = (process.env.DEBUG_COLORS || '').trim().toLowerCase();
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if (0 === debugColors.length) {
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return tty.isatty(1);
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} else {
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return '0' !== debugColors
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&& 'no' !== debugColors
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&& 'false' !== debugColors
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&& 'disabled' !== debugColors;
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}
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}
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/**
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* Map %o to `util.inspect()`, since Node doesn't do that out of the box.
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*/
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exports.formatters.o = function(v) {
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return util.inspect(v, { colors: this.useColors })
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.replace(/\s*\n\s*/g, ' ');
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};
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/**
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* Invokes `console.log()` with the specified arguments,
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* after adding ANSI color escape codes if enabled.
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*
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* @api public
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*/
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function log() {
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var args = arguments;
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var useColors = this.useColors;
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var name = this.namespace;
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if (useColors) {
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var c = this.color;
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args[0] = ' \u001b[9' + c + 'm' + name + ' '
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+ '\u001b[0m'
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+ args[0] + '\u001b[3' + c + 'm'
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+ ' +' + exports.humanize(this.diff) + '\u001b[0m';
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} else {
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args[0] = new Date().toUTCString()
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+ ' ' + name + ' ' + args[0];
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}
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console.log.apply(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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if (null == namespaces) {
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// If you set a process.env field to null or undefined, it gets cast to the
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// string 'null' or 'undefined'. Just delete instead.
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delete process.env.DEBUG;
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} else {
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process.env.DEBUG = namespaces;
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}
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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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return process.env.DEBUG;
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}
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/**
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* Enable namespaces listed in `process.env.DEBUG` initially.
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*/
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exports.enable(load());
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