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source/_posts/omega-subtheme-drush-omega-tools.md

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+---
+title: Create an Omega Subtheme with LESS CSS Preprocessor using Omega Tools and Drush
+date: '2012-04-16'
+slug: create-omega-subtheme-less-css-preprocessor-using-omega-tools-and-drush
+tags:
+  - drupal-7
+  - omega
+  - theming
+  - less
+  - drupal-planet
+  - drupal
+use: [posts]
+---
+{% block excerpt %}
+In this tutorial I'll be showing how to create an [Omega](http://drupal.org/project/omega) subtheme using the [Omega Tools](http://drupal.org/project/omega_tools) module, and have it working with the [LESS CSS preprocessor](http://lesscss.org).
+
+The first thing that I need to do is download the Omega theme and the Omega Tools and [LESS](http://drupal.org/project/less "LESS module on drupal.org") modules, and then to enable both modules. I'm doing this using Drush, but you can of course do this via the admin interface at admin/modules.
+{% endblock %}
+
+{% block content %}
+```language-bash
+$ drush dl less omega omega_tools;
+$ drush en -y less omega_tools
+```
+
+With the Omega Tools module enabled I get the drush omega-subtheme command that creates my Omega subtheme programatically. Using this command, I'm creating a new subtheme, enabling it and setting it as the default theme on my site.
+
+```language-bash
+$ drush omega-subtheme "Oliver Davies" --machine_name="oliverdavies" --enable --set-default
+```
+
+By default, four stylesheets are created within the subtheme's css directory. The first thing that I'm going to do is rename `global.css` to `global.less`.
+
+```language-bash
+$ mv css/global.css css/global.less
+```
+
+Now I need to find all references to global.css within my oliverdavies.info file. I did this using `$ nano oliverdavies.info`, pressing `Ctrl+W` to search, then `Ctrl+R` to replace, entering `global.css` as the search phrase, and then `global.less` as the replacement text. After making any changes to oliverdavies.info, I need to clear Drupal's caches for the changes to be applied.
+
+```language-bash
+$ drush cc all
+```
+
+I tested my changes by making some quick additions to my global.less file and reloading the page.
+
+If your changes aren't applied, then confirm that your global.less file is enabled within your theme's configuration. I did this by going to admin/appearance/settings/oliverdavies, clicking on the Toggle styles tab within *Layout configuration* and finding global.less at the bottom of *Enable optional stylesheets*.
+{% endblock %}