gulp-rev-append
gulp plugin for cache-busting files using file hash
installation
$ npm install gulp-rev-append --save-dev
how?
gulpfile.js
var rev = require('gulp-rev-append');
gulp.task('rev', function() {
gulp.src('./index.html')
.pipe(rev())
.pipe(gulp.dest('.'));
});
terminal
$ gulp rev
what?
The gulp-rev-append task allows for appending a file hash to dependencies declared in html files defined using the following regex: (?:href|src)="(.*)[\?]rev=(.*)[\"]
That's fancy talk for any stylesheet or script declarations that are declared in an html file such as the following:
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style/style-one.css?rev=@@hash">
<script src="script/script-one.js?rev=@@hash"></script>
<script src="script/script-two.js"></script>
</head>
<body>
<div><p>hello, world!</p></div>
<script src="script/script-three.js?rev=@@hash"></script>
</body>
</html>
will turn into something similar as the following after running gulp-rev-append
:
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style/style-one.css?rev=d65aaba987e9c1eefeb4be9cfd34e0de">
<script src="script/script-one.js?rev=17a5da6c8a2d875cf48aefb722eefa07"></script>
<script src="script/script-two.js"></script>
</head>
<body>
<div><p>hello, world!</p></div>
<script src="script/script-three.js?rev=5cadf43edba6a97980d42331f9fffd17"></script>
</body>
</html>
Any subsequent runs of the gulp-rev-append
file will change the output only if the target file(s) delcared have changed. This is because the revision hash is computed using the target file contents.
The only requirement is that the dependency is declared with the appendage ?rev=
. @@hash
is not required, and any value will be overriden as the dependency file contents change.
why?
I wanted to easily define dependencies that require cache-busting by appending the file declaration in an html file. The hash is based on file content, so any change to the dependency would result in a change to the generated and appended hash - effectively cahe-busting the dependency.
no, but why
There are several gulp plugins that already support revisioning and cache-busting: https://www.npmjs.org/search?q=gulp-rev
I created this plugin as it fit my needs more clearly in:
- enabling cache-busting by appending a file hash based on a query param
- not requiring additionally markup commenting
- not generating an additional manifest to be a dependency in file access for production-level application
If the intent of this plugin does not meet your needs, please checkout the other possible solutions made by some awesome developers.
Tests
$ npm run test
License
Copyright (c) 2014 Todd Anderson
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.