Sass, color schemes with bootstrap - twitter-bootstrap-3

Question

i read this article http://www.sitepoint.com/dealing-color-schemes-sass/ and I wanted to try to apply the method but I've a question: It's possible use this with a variable?
Ex. I use bootstrap and i wanna change only value (without assign a property) for $brand-primary, can i change this value with this method?
I've assigned a dynamic class on my body ( or ), and i wanna change a $brand-primary value for every class...
Another Ex.
If body class is "en" $brand-primary: red; if body class is "it" $brand-primary: blue; if body class is "fr" $brand-primary: green;
It's possible?
Thanks for your reply.

Answer 1

Perhaps the cleanest way to accomplish this is to create a mixin, and then pass in theme color variables.
The theme mixin code takes in all necessary colors, as well as a name that corresponds to the body class:
#mixin theme($name, $brand-primary) {
body.#{$name} {
background-color: $brand-primary;
}
}
Create a separate Sass partial for housing your theme color variables. In this case, it would look something like this:
$brand-primary: green;
Create as many of these files as you have themes.
Using the themes is then as simple as:
#import 'Themes/_theme-name.scss';
#include theme("theme-name", $brand-primary);
Bonus - if you need to apply styles to a specific theme, it's as easy as an #if statement in the mixin:
#if ($name == "theme-name") {
.class-name {background-image: url(example.png);}
}