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The LESS module allows you to use LESS stylesheets in your Play application, without having to manually compile them to CSS.
Add the less module to your application.conf:
module.less=${play.path}/modules/less
Now any file in your public/ directory that ends in .less is automatically processed by the plugin, and outputted as CSS.
Example Create a file called public/stylesheets/style.less, with contents:
@color: red;
h1 {
color: @color;
}
Now, add the stylesheet to your main template in app/views/main.html:
<link type="text/css" rel="stylesheet" href="@{'public/stylesheets/style.less'}" />
The less module sets and listens to Last-Modified and ETag headers, so most browsers will retrieve the file only once. At the server, a compiled CSS file is stored in the cache, and automatically invalidated when the less file changes, or when one of the imported files change. So you can change your less files even while Play is running in production mode.
In case of an error in your less file, the error will be shown on your page to help you debug.