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72 lines
1.5 KiB
Markdown
72 lines
1.5 KiB
Markdown
# last-line-stream
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> A PassThrough stream that keeps track of last line written.
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[](https://travis-ci.org/jamestalmage/last-line-stream) [](https://coveralls.io/github/jamestalmage/last-line-stream?branch=master)
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## Install
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```
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$ npm install --save last-line-stream
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```
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## Usage
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```js
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const lastLineStream = require('last-line-stream');
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const stream = lastLineStream();
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stream.write('foo');
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assert(stream.lastLine === 'foo');
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stream.write('bar');
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assert(stream.lastLine === 'foobar');
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stream.write('baz\nquz');
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assert(stream.lastLine === 'quz');
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```
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## API
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### lastLineStream([pipeTo])
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Returns a new instance of the spying PassThrough stream,
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#### pipeTo
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Type: `stream`
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If supplied, the new instance will automatically be piped to this stream.
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### stream.lastLine
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Type: `string`
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The last line written out to this stream. The `lastLine` value will grow until the stream sees a newline character (`'\n'`).
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## Low Level API
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A low-level non-stream based API is available. It has only two methods.
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```js
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var createTracker = require('last-line-stream/tracker');
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var tracker = createTracker();
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// append some text.
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tracker.update(someString);
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// Find the complete last line of all the text appended.
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tracker.lastLine();
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```
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## License
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MIT © [James Talmage](http://github.com/jamestalmage)
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