opusdev/vector-similarity-api
1
1# debug2[](https://travis-ci.org/visionmedia/debug) [](https://coveralls.io/github/visionmedia/debug?branch=master) [](https://visionmedia-community-slackin.now.sh/) [](#backers) 3[](#sponsors)4 5 6 7A tiny node.js debugging utility modelled after node core's debugging technique.8 9**Discussion around the V3 API is under way [here](https://github.com/visionmedia/debug/issues/370)**10 11## Installation12 13```bash14$ npm install debug15```16 17## Usage18 19`debug` exposes a function; simply pass this function the name of your module, and it will return a decorated version of `console.error` for you to pass debug statements to. This will allow you to toggle the debug output for different parts of your module as well as the module as a whole.20 21Example _app.js_:22 23```js24var debug = require('debug')('http')25 , http = require('http')26 , name = 'My App';27 28// fake app29 30debug('booting %s', name);31 32http.createServer(function(req, res){33 debug(req.method + ' ' + req.url);34 res.end('hello\n');35}).listen(3000, function(){36 debug('listening');37});38 39// fake worker of some kind40 41require('./worker');42```43 44Example _worker.js_:45 46```js47var debug = require('debug')('worker');48 49setInterval(function(){50 debug('doing some work');51}, 1000);52```53 54 The __DEBUG__ environment variable is then used to enable these based on space or comma-delimited names. Here are some examples:55 56 57 58 59 60#### Windows note61 62 On Windows the environment variable is set using the `set` command.63 64 ```cmd65 set DEBUG=*,-not_this66 ```67 68 Note that PowerShell uses different syntax to set environment variables.69 70 ```cmd71 $env:DEBUG = "*,-not_this"72 ```73 74Then, run the program to be debugged as usual.75 76## Millisecond diff77 78 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.79 80 81 82 When stdout is not a TTY, `Date#toUTCString()` is used, making it more useful for logging the debug information as shown below:83 84 85 86## Conventions87 88 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".89 90## Wildcards91 92 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=*`.93 94 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:".95 96## Environment Variables97 98 When running through Node.js, you can set a few environment variables that will99 change the behavior of the debug logging:100 101| Name | Purpose |102|-----------|-------------------------------------------------|103| `DEBUG` | Enables/disables specific debugging namespaces. |104| `DEBUG_COLORS`| Whether or not to use colors in the debug output. |105| `DEBUG_DEPTH` | Object inspection depth. |106| `DEBUG_SHOW_HIDDEN` | Shows hidden properties on inspected objects. |107 108 109 __Note:__ The environment variables beginning with `DEBUG_` end up being110 converted into an Options object that gets used with `%o`/`%O` formatters.111 See the Node.js documentation for112 [`util.inspect()`](https://nodejs.org/api/util.html#util_util_inspect_object_options)113 for the complete list.114 115## Formatters116 117 118 Debug uses [printf-style](https://wikipedia.org/wiki/Printf_format_string) formatting. Below are the officially supported formatters:119 120| Formatter | Representation |121|-----------|----------------|122| `%O` | Pretty-print an Object on multiple lines. |123| `%o` | Pretty-print an Object all on a single line. |124| `%s` | String. |125| `%d` | Number (both integer and float). |126| `%j` | JSON. Replaced with the string '[Circular]' if the argument contains circular references. |127| `%%` | Single percent sign ('%'). This does not consume an argument. |128 129### Custom formatters130 131 You can add custom formatters by extending the `debug.formatters` object. For example, if you wanted to add support for rendering a Buffer as hex with `%h`, you could do something like:132 133```js134const createDebug = require('debug')135createDebug.formatters.h = (v) => {136 return v.toString('hex')137}138 139// …elsewhere140const debug = createDebug('foo')141debug('this is hex: %h', new Buffer('hello world'))142// foo this is hex: 68656c6c6f20776f726c6421 +0ms143```144 145## Browser support146 You can build a browser-ready script using [browserify](https://github.com/substack/node-browserify),147 or just use the [browserify-as-a-service](https://wzrd.in/) [build](https://wzrd.in/standalone/debug@latest),148 if you don't want to build it yourself.149 150 Debug's enable state is currently persisted by `localStorage`.151 Consider the situation shown below where you have `worker:a` and `worker:b`,152 and wish to debug both. You can enable this using `localStorage.debug`:153 154```js155localStorage.debug = 'worker:*'156```157 158And then refresh the page.159 160```js161a = debug('worker:a');162b = debug('worker:b');163 164setInterval(function(){165 a('doing some work');166}, 1000);167 168setInterval(function(){169 b('doing some work');170}, 1200);171```172 173#### Web Inspector Colors174 175 Colors are also enabled on "Web Inspectors" that understand the `%c` formatting176 option. These are WebKit web inspectors, Firefox ([since version177 31](https://hacks.mozilla.org/2014/05/editable-box-model-multiple-selection-sublime-text-keys-much-more-firefox-developer-tools-episode-31/))178 and the Firebug plugin for Firefox (any version).179 180 Colored output looks something like:181 182 183 184 185## Output streams186 187 By default `debug` will log to stderr, however this can be configured per-namespace by overriding the `log` method:188 189Example _stdout.js_:190 191```js192var debug = require('debug');193var error = debug('app:error');194 195// by default stderr is used196error('goes to stderr!');197 198var log = debug('app:log');199// set this namespace to log via console.log200log.log = console.log.bind(console); // don't forget to bind to console!201log('goes to stdout');202error('still goes to stderr!');203 204// set all output to go via console.info205// overrides all per-namespace log settings206debug.log = console.info.bind(console);207error('now goes to stdout via console.info');208log('still goes to stdout, but via console.info now');209```210 211 212## Authors213 214 - TJ Holowaychuk215 - Nathan Rajlich216 - Andrew Rhyne217 218## Backers219 220Support us with a monthly donation and help us continue our activities. 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limitation the rights to use, copy, modify, merge, publish,299distribute, sublicense, and/or sell copies of the Software, and to300permit persons to whom the Software is furnished to do so, subject to301the following conditions:302 303The above copyright notice and this permission notice shall be304included in all copies or substantial portions of the Software.305 306THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,307EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF308MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.309IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY310CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,311TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE312SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.313