bash colors

if test -t 1; then
    ncolors=$(tput colors)
    if test -n "$ncolors" && test $ncolors -ge 8; then
        black=$(eval tput setaf 0);
        red=$(eval tput setaf 1);
        green=$(eval tput setaf 2);
        yellow=$(eval tput setaf 3);
        blue=$(eval tput setaf 4);
        magenta=$(eval tput setaf 5);
        cyan=$(eval tput setaf 6);
        white=$(eval tput setaf 7);
        reset=$(eval tput sgr0);
    fi
else
    black="";
    red="";
    green="";
    yellow="";
    blue="";
    magenta="";
    cyan="";
    white="";
    reset="";
fi