82 lines
2.9 KiB
Markdown
82 lines
2.9 KiB
Markdown
<p align="center">
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<a href="http://gulpjs.com">
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<img height="257" width="114" src="https://raw.githubusercontent.com/gulpjs/artwork/master/gulp-2x.png">
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</a>
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</p>
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# last-run
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[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![Gitter chat][gitter-image]][gitter-url]
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Capture and retrieve the last time a function was run.
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## Usage
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```js
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var lastRun = require('last-run');
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function myFunc(){}
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myFunc();
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// capture the run after (or before) calling the function
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lastRun.capture(myFunc);
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// retrieve the last run time
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lastRun(myFunc);
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//-> outputs the Date.now() when capture was called
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```
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## API
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__Note: this module uses a WeakMap shim, and throws on non-extensible functions on platforms that
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don't have a native WeakMap implementation__
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### lastRun(fn, [timeResolution]) => [Timestamp]
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Takes a function (`fn`) and returns a timestamp of the last time the function was captured.
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Returns undefined if the function has not been captured.
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The timestamp is always given in millisecond but the time resolution can be reduced (rounded down).
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The use case is to be able to compare a build time to a file time attribute.
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On node v0.10 or with file system like HFS or FAT, `fs.stat` time attributes like `mtime` precision is one second.
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Assuming `lastRun(fn)` returns 1426000001111, `lastRun(fn, 1000)` returns 1426000001000.
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The default time resolution is 1000 on node v0.10, 0 on node 0.11+ and iojs.
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More information at [`default-resolution`][default-resolution] and
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[undertaker PR #17][undertaker-17].
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### lastRun.capture(fn, [timestamp])
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Takes a function (`fn`) and captures the current timestamp with `Date.now()`.
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If passed the optional timestamp, captures that time instead of `Date.now()`.
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The captured timestamp can then be retrieved using the `lastRun` function.
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### lastRun.release(fn)
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Takes a function (`fn`) and removes the last run timestamp for it.
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## License
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MIT
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[default-resolution]: https://github.com/gulpjs/default-resolution
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[undertaker-17]: https://github.com/gulpjs/undertaker/pull/17#issuecomment-82374512
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[downloads-image]: http://img.shields.io/npm/dm/last-run.svg
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[npm-url]: https://www.npmjs.com/package/last-run
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[npm-image]: http://img.shields.io/npm/v/last-run.svg
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[travis-url]: https://travis-ci.org/gulpjs/last-run
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[travis-image]: http://img.shields.io/travis/gulpjs/last-run.svg?label=travis-ci
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[appveyor-url]: https://ci.appveyor.com/project/gulpjs/last-run
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[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/last-run.svg?label=appveyor
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[coveralls-url]: https://coveralls.io/r/gulpjs/last-run
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[coveralls-image]: http://img.shields.io/coveralls/gulpjs/last-run/master.svg
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[gitter-url]: https://gitter.im/gulpjs/gulp
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[gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg
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