List CSS class and id usage within a directory of files

stylecheck.sh

#! /bin/sh
#  stylecheck.sh:
#                                                                                             
#      Find unused CSS class and id selectors, given a CSS file and a directory                            
#      of HTML documents.                                                                                  
#                                                                                                      
#      $1 = CSS document, $2 = HTML directory
#
#      Returns a report in YAML.                                                              
#                                                                                                      
#  by Mark
                                                                                             
echo -e "# Analyzing usage of $1 in $0\n---"
                                                           
classes=`grep -o -P '(?<=\.)[a-zA-Z][a-zA-z0-9_\-]*(?=([ ,\n]*[a-zA-Z0-9_\-#\.\:]*)*{)' <"$1" | sort | uniq`
ids=`grep -o -P '(?<=#)[a-zA-Z][a-zA-z0-9_\-]*(?=([ ,\n]*[a-zA-Z0-9_\-#\.\:]*)*{)' <"$1" | sort | uniq`

echo "CSS classes:"                                                                                    
for s in $classes; do                                                                                  
        echo "    $s:"                                                                                 
        for f in `ack "class=\"( |[a-zA-Z0-9]|-)*$s( |[a-zA-Z0-9]|-)*\"" $2 --type=nocss -l`; do       
                echo "        - $f"                                                                    
        done                                                                                           
done                                                                                                   

echo -e "\nCSS ids:"                                                                                   
for s in $ids; do                                                                                      
        echo "    $s:"                                                                                 
        for f in `ack "id=\"$s\"" $2 --type=nocss -l`; do                                              
                echo "        - $f"                                                                    
        done                                                                                           
done