Remove background-image from within :hover tags

gistfile1.groovy

// Strip all background-image styles from :hover elements
// This causes weird issues in Chrome
// http://stackoverflow.com/questions/8035366/image-flickering-on-mouseover-even-when-sprites-are-used-for-hover-image/8057250#8057250
//
// Note - this snippet has not been thoroughly tested, and uses simple regex - it's not aware of the actual CSS structure, and might make mistakes
// (E.g. a "}" inside of a comment might fool it
def cssFile = new File("$outputDir/css/combined-sprite.css")
String newCss = ""
boolean inHover = false
cssFile.eachLine(){ line ->
    def writeThisLine = ({
        // in/out hover mode
        if (line =~  /\:\s*hover.*\{/) { // entering hover
            assert !inHover, "Can't enter hover while in hover mode"
            inHover = true;
            return true;
        }
        if (inHover && line =~ /\}/) {
            inHover = false;
            return true;
        }
        return !(inHover && line =~ /background-image\s*:/)
    })()
    if (writeThisLine) {
        newCss += line + "\r\n";
    }
}
cssFile.text = newCss