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-# debug
-
- tiny node.js debugging utility modelled after node core's debugging technique.
-
-## Installation
-
-```bash
-$ npm install debug
-```
-
-## Usage
-
- With `debug` you simply invoke the exported function to generate your debug function, passing it a name which will determine if a noop function is returned, or a decorated `console.error`, so all of the `console` format string goodies you're used to work fine. A unique color is selected per-function for visibility.
-
-Example _app.js_:
-
-```js
-var debug = require('debug')('http')
- , http = require('http')
- , name = 'My App';
-
-// fake app
-
-debug('booting %s', name);
-
-http.createServer(function(req, res){
- debug(req.method + ' ' + req.url);
- res.end('hello\n');
-}).listen(3000, function(){
- debug('listening');
-});
-
-// fake worker of some kind
-
-require('./worker');
-```
-
-Example _worker.js_:
-
-```js
-var debug = require('debug')('worker');
-
-setInterval(function(){
- debug('doing some work');
-}, 1000);
-```
-
- The __DEBUG__ environment variable is then used to enable these based on space or comma-delimited names. Here are some examples:
-
- ![debug http and worker](http://f.cl.ly/items/18471z1H402O24072r1J/Screenshot.png)
-
- ![debug worker](http://f.cl.ly/items/1X413v1a3M0d3C2c1E0i/Screenshot.png)
-
-#### Windows note
-
- On Windows the environment variable is set using the `set` command.
-
- ```cmd
- set DEBUG=*,-not_this
- ```
-
-Then, run the program to be debugged as usual.
-
-## Millisecond diff
-
- When actively developing an application it can be useful to see when the time spent between one `debug()` call and the next. Suppose for example you invoke `debug()` before requesting a resource, and after as well, the "+NNNms" will show you how much time was spent between calls.
-
- ![](http://f.cl.ly/items/2i3h1d3t121M2Z1A3Q0N/Screenshot.png)
-
- When stdout is not a TTY, `Date#toUTCString()` is used, making it more useful for logging the debug information as shown below:
-
- ![](http://f.cl.ly/items/112H3i0e0o0P0a2Q2r11/Screenshot.png)
-
-## Conventions
-
- If you're using this in one or more of your libraries, you _should_ use the name of your library so that developers may toggle debugging as desired without guessing names. If you have more than one debuggers you _should_ prefix them with your library name and use ":" to separate features. For example "bodyParser" from Connect would then be "connect:bodyParser".
-
-## Wildcards
-
- The `*` character may be used as a wildcard. Suppose for example your library has debuggers named "connect:bodyParser", "connect:compress", "connect:session", instead of listing all three with `DEBUG=connect:bodyParser,connect.compress,connect:session`, you may simply do `DEBUG=connect:*`, or to run everything using this module simply use `DEBUG=*`.
-
- You can also exclude specific debuggers by prefixing them with a "-" character. For example, `DEBUG=*,-connect:*` would include all debuggers except those starting with "connect:".
-
-## Browser support
-
- Debug works in the browser as well, currently persisted by `localStorage`. Consider the situation shown below where you have `worker:a` and `worker:b`, and wish to debug both. Somewhere in the code on your page, include:
-
-```js
-window.myDebug = require("debug");
-```
-
- ("debug" is a global object in the browser so we give this object a different name.) When your page is open in the browser, type the following in the console:
-
-```js
-myDebug.enable("worker:*")
-```
-
- Refresh the page. Debug output will continue to be sent to the console until it is disabled by typing `myDebug.disable()` in the console.
-
-```js
-a = debug('worker:a');
-b = debug('worker:b');
-
-setInterval(function(){
- a('doing some work');
-}, 1000);
-
-setInterval(function(){
- b('doing some work');
-}, 1200);
-```
-
-#### Web Inspector Colors
-
- Colors are also enabled on "Web Inspectors" that understand the `%c` formatting
- option. These are WebKit web inspectors, Firefox ([since version
- 31](https://hacks.mozilla.org/2014/05/editable-box-model-multiple-selection-sublime-text-keys-much-more-firefox-developer-tools-episode-31/))
- and the Firebug plugin for Firefox (any version).
-
- Colored output looks something like:
-
- ![](https://cloud.githubusercontent.com/assets/71256/3139768/b98c5fd8-e8ef-11e3-862a-f7253b6f47c6.png)
-
-### stderr vs stdout
-
-You can set an alternative logging method per-namespace by overriding the `log` method on a per-namespace or globally:
-
-Example _stderr.js_:
-
-```js
-var debug = require('../');
-var log = debug('app:log');
-
-// by default console.log is used
-log('goes to stdout!');
-
-var error = debug('app:error');
-// set this namespace to log via console.error
-error.log = console.error.bind(console); // don't forget to bind to console!
-error('goes to stderr');
-log('still goes to stdout!');
-
-// set all output to go via console.warn
-// overrides all per-namespace log settings
-debug.log = console.warn.bind(console);
-log('now goes to stderr via console.warn');
-error('still goes to stderr, but via console.warn now');
-```
-
-## Authors
-
- - TJ Holowaychuk
- - Nathan Rajlich
-
-## License
-
-(The MIT License)
-
-Copyright (c) 2014 TJ Holowaychuk <tj@vision-media.ca>
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-'Software'), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be
-included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.