Add color to the output of svn diff

svn-color-diff.sh

nicediff() {
    RED='\033[31m'
    GREEN='\033[32m'
    CYAN='\033[36m'
    BOLD='\033[1;37m'
    NC='\033[0m'
    R_REMOVED="^\-([^-]|$)" 
    R_ADDED="^\+([^+]|$)"
    R_AT="^\@\@ \-[0-9]+,[0-9]+ \+[0-9]+,[0-9]+ \@\@$"
    R_DIFF_HEAD="^(\-\-\-|\+\+\+)[^\-\+]+$|^=+$|^Index:"
    $(which svn) diff $1 | sed 's:\r::' | while IFS= read -r line; do
        if [[ $line =~ $R_REMOVED ]]; then
            echo -ne "$RED"
        elif [[ $line =~ $R_ADDED ]]; then
            echo -ne "$GREEN"
        elif [[ $line =~ $R_AT ]]; then
            echo -ne "$CYAN"
        elif [[ $line =~ $R_DIFF_HEAD ]]; then
            echo -ne "$BOLD"
        fi
        echo -n "$line"
        echo -e "${NC}"
    done
}

svn() {
    case $1 in
    diff)
        nicediff $2 | less -R;; 
    *)  
       $(which svn) "$@";;
    esac
}