capture-stream

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Capture stream output.

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# capture-stream [![NPM version](https://img.shields.io/npm/v/capture-stream.svg)](https://www.npmjs.com/package/capture-stream) [![Build Status](https://img.shields.io/travis/doowb/capture-stream.svg)](https://travis-ci.org/doowb/capture-stream)

> Capture stream output.

## Install

Install with [npm](https://www.npmjs.com/):

```sh
$ npm install capture-stream --save
```

## Usage

```js
var capture = require('capture-stream');
var restore = capture(process.stdout);

console.log('Hello, world!!!');
console.log('foo', 'bar');

var output = restore();
console.log(output);
//=> [ [ 'Hello, world!!!\n' ], [ 'foo bar\n' ] ]
```

Pass `true` to `restore` to return a string instead of an array of output.

```js
var capture = require('capture-stream');
var restore = capture(process.stdout);

console.log('Hello, world!!!');
console.log('foo', 'bar');

var output = restore(true);
console.log(output);
//=> Hello, world!!!
//=> foo bar
//=>
```

This module has been built to be used in unit tests to easily capture output from `process.stdout` and `process.stderr` and test the results.

```js
describe('awesome module', function () {
  function log () {
    console.log.apply(console, arguments);
  }

it('should write "Hello, world!!!" to stdout', function () {
    var restore = capture(process.stdout);
    log('Hello, world!!!');
    var output = restore();
    assert.equal(output.length, 1);
    assert(output[0][0].indexOf('Hello, world!!!') === 0);
  });
});
```

## API

### [captureStream](index.js#L27)

Capture the output from a stream and store later.

**Params**

* `stream` **{Stream}**: A stream to capture output from (e.g. `process.stdout`, `process.stderr`)
* `returns` **{Function}** `restore`: function that restores normal output and returns an array of output.

**Example**

```js
var restore = capture(process.stdout);
console.log('Hello, world!!!');
console.log('foo', 'bar');

var output = restore();
console.log(output);
//=> [ [ 'Hello, world!!!\n' ], [ 'foo bar\n' ] ]
```

## Related projects

* [composer-errors](https://www.npmjs.com/package/composer-errors): Listen for and output Composer errors. | [homepage](https://github.com/doowb/composer-errors)
* [composer-runtimes](https://www.npmjs.com/package/composer-runtimes): Write composer task start and end times to a stream. | [homepage](https://github.com/doowb/composer-runtimes)

## Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](https://github.com/doowb/capture-stream/issues/new).

## Building docs

Generate readme and API documentation with [verb][]:

```sh
$ npm install verb && npm run docs
```

Or, if [verb][] is installed globally:

```sh
$ verb
```

## Running tests

Install dev dependencies:

```sh
$ npm install -d && npm test
```

## Author

**Brian Woodward**

* [github/doowb](https://github.com/doowb)
* [twitter/doowb](http://twitter.com/doowb)

## License

***

_This file was generated by [verb](https://github.com/verbose/verb), v0.9.0, on March 19, 2016._

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