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<!-- @file Instructions for subtheming using the Less Starterkit. -->
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<!-- @defgroup subtheme_less -->
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<!-- @ingroup subtheme -->
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# Less Starterkit
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Below are instructions on how to create a Bootstrap sub-theme using a Less
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preprocessor.
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- [Prerequisites](#prerequisites)
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- [Additional Setup](#setup)
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- [Overrides](#overrides)
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## Prerequisites
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- Read the @link getting_started Getting Started @endlink and @link subtheme Sub-theming @endlink documentation topics.
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- You must understand the basic concept of using the [Less] CSS pre-processor.
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- You must use a **[local Less compiler](https://www.google.com/search?q=less+compiler)**.
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- You must use the [Bootstrap Framework Source Files] ending in the `.less`
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extension, not files ending in `.css`.
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## Additional Setup {#setup}
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Download and extract the **latest** 3.x.x version of
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[Bootstrap Framework Source Files] into your new sub-theme. After it has been
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extracted, the folder should read `./subtheme/bootstrap`.
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If for whatever reason you have an additional `bootstrap` folder wrapping the
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first `bootstrap` folder (e.g. `./subtheme/bootstrap/bootstrap`), remove the
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wrapping `bootstrap` folder. You will only ever need to touch these files if
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or when you upgrade your version of the [Bootstrap Framework].
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{.alert.alert-warning} **WARNING:** Do not modify the files inside of
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`./subtheme/bootstrap` directly. Doing so may cause issues when upgrading the
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[Bootstrap Framework] in the future.
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## Overrides {#overrides}
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The `./subtheme/less/variable-overrides.less` file is generally where you will
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the majority of your time overriding the variables provided by the [Bootstrap
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Framework].
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The `./subtheme/less/bootstrap.less` file is nearly an exact copy from the
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[Bootstrap Framework Source Files]. The only difference is that it injects the
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`variable-overrides.less` file directly after it has imported the [Bootstrap
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Framework]'s `variables.less` file. This allows you to easily override variables
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without having to constantly keep up with newer or missing variables during an
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upgrade.
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The `./subtheme/less/overrides.less` file contains various Drupal overrides to
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properly integrate with the [Bootstrap Framework]. It may contain a few
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enhancements, feel free to edit this file as you see fit.
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The `./subtheme/less/style.less` file is the glue that combines the
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`bootstrap.less` and `overrides.less` files together. Generally, you will not
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need to modify this file unless you need to add or remove files to be imported.
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This is the file that you should compile to `./subtheme/css/styles.css` (note
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the same file name, using a different extension of course).
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#### See also:
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- @link templates Templates @endlink
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- @link theme_settings Theme Settings @endlink
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- @link registry Theme Registry @endlink
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[Bootstrap Framework]: http://getbootstrap.com
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[Bootstrap Framework Source Files]: https://github.com/twbs/bootstrap/releases
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[Less]: http://lesscss.org
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