Assuming you have Mixture and XAMPP (or similar local server) installed and your WordPress site is already working locally.

• Make sure there’s no existing compass folder or config.rb file in your theme folder.
• Start XAMPP (or other local server).
• Start Mixture.
• Click Open in Mixture and select your theme folder inside wp-content/themes
• Select your theme folder for the Preprocessor location.
• Enter your localhost URL for the Partner server address, in my case it’s http://localhost

Mixture will now report errors. Here’s how to fix them.

Assuming you have the following file structure in your theme folder:

• A style.css in the root of the theme that only contains theme information header, an @import statement for your “global” css file (that contains all your styles) and maybe also an @import statement for your parent theme’s stylesheet if you are working on a child theme. Here’s an example style.css for a child theme:

/*
Theme Name:     Twenty Twelve Child
Description:    Child theme for the Twenty Twelve theme 
Author:         Ben Pearson
Author URI:     http://benpearson.com.au
Template:       twentytwelve
Version:        1.0
*/

@import url("../twentytwelve/style.css");

@import url("css/global.css");

• All your SCSS files are kept in the an scss folder. I have a global.scss file in this folder that imports all the partials like _navigation.scss. This global.scss will be compiled to css/global.css and then imported by style.css
• All your CSS will the exception of style.css is kept/compiled in a css folder.
• All your images are kept in an images folder
• All your javascript is kept in an js folder

Open the mixture.json file that has been newly created in your theme’s root folder and make the following change:

"useCompass": true,

This will create a compass folder in your theme folder with a config.rb file inside it.

Now change the preprocessorLocations in mixture.json to the root like so:

"preprocessorLocations": "/",

Open compass/config.rb and change the CSS, SCSS, images and javascript paths to the following:

css_dir = "css"
sass_dir = "scss"
images_dir = "images"
javascripts_dir = "js"

Click View locally in Mixture to view your site through Mixture and take advantage of it’s SASS/Compass compiler and live reload functionality.

 

Using Mixture with a virtual host (optional)

The following instructions work on Windows 7. They may also work on other operating systems.

Assuming you have already setup a virtual host.

Make the following changes to mixture.json, substituting bp.benpearson for the name of your virtual host.

"serverHostname": "bp.benpearson",
"serverPort": 80,
"simpleModePartnerServer": "http://bp.benpearson/",

When you click View locally in Mixture it will open the site at a URL like:

http://bp.benpearson:63229/

The :63229 is there because that’s the port that Mixture is using. To get rid of this you need to make sure port 80 is free for Mixture to use. In my case port 80 is being used by XAMPP.

 

References

• Mixture docs and video tutorials
• Why root preprocessorLocations in mixture.json need to be set manually and not in the Open dialog box in Mixture
• Using Mixture with a custom host name
• Compass compiling and WordPress themes