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# byline — buffered stream for reading lines
`byline` is a simple module providing a `LineStream`.
- node v0.10 `streams2` (transform stream)
- supports `pipe`
- supports both UNIX and Windows line endings
- supports [Unicode UTS #18 line boundaries](http://www.unicode.org/reports/tr18/#Line_Boundaries)
- can wrap any readable stream
- can be used as a readable-writable "through-stream" (transform stream)
- super-simple: `stream = byline(stream);`
## Install
npm install byline
or from source:
git clone git://github.com/jahewson/node-byline.git
cd node-byline
npm link
# Convenience API
The `byline` module can be used as a function to quickly wrap a readable stream:
```javascript
var fs = require('fs'),
byline = require('byline');
var stream = byline(fs.createReadStream('sample.txt', { encoding: 'utf8' }));
```
The `data` event then emits lines:
```javascript
stream.on('data', function(line) {
console.log(line);
});
```
# Standard API
You just need to add one line to wrap your readable `Stream` with a `LineStream`.
```javascript
var fs = require('fs'),
byline = require('byline');
var stream = fs.createReadStream('sample.txt');
stream = byline.createStream(stream);
stream.on('data', function(line) {
console.log(line);
});
```
# Piping
`byline` supports `pipe` (though it strips the line endings, of course).
```javascript
var stream = fs.createReadStream('sample.txt');
stream = byline.createStream(stream);
stream.pipe(fs.createWriteStream('nolines.txt'));
```
Alternatively, you can create a readable/writable "through-stream" which doesn't wrap any specific
stream:
```javascript
var stream = fs.createReadStream('sample.txt');
stream = byline.createStream(stream);
stream.pipe(fs.createWriteStream('nolines.txt'));
var input = fs.createReadStream('LICENSE');
var lineStream = byline.createStream();
input.pipe(lineStream);
var output = fs.createWriteStream('test.txt');
lineStream.pipe(output);
```
# Streams2 API
Node v0.10 added a new streams2 API. This allows the stream to be used in non-flowing mode and is
preferred over the legacy pause() and resume() methods.
```javascript
var stream = fs.createReadStream('sample.txt');
stream = byline.createStream(stream);
stream.on('readable', function() {
var line;
while (null !== (line = stream.read())) {
console.log(line);
}
});
```
# Transform Stream
The `byline` transform stream can be directly manipulated like so:
```javascript
var LineStream = require('byline').LineStream;
var input = fs.createReadStream('sample.txt');
var output = fs.createWriteStream('nolines.txt');
var lineStream = new LineStream();
input.pipe(lineStream);
lineStream.pipe(output);
```
# Empty Lines
By default byline skips empty lines, if you want to keep them, pass the `keepEmptyLines` option in
the call to `byline.createStream(stream, options)` or `byline(stream, options)`.
# Tests
npm test
# v0.8
If you want to use `node-byline` with node v0.8 then you can use the 2.1.x series. Simply use the
following in your `package.json`:
```javascript
"dependencies": {
"byline": ">=2.1.0 <3.0.0"
},
```
# Simple
Unlike other modules (of which there are many), `byline` contains no:
- monkeypatching
- dependencies
- non-standard 'line' events which break `pipe`
- limitations to only file streams
- CoffeeScript
- unnecessary code