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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
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