Host-dependent automatic prompt colorization

.bashrc

    # Set the gaudy prompt.

    # ^O puts terminal back into default text mode for every prompt,
    # preventing random glyphs.

    resetterm="\[\017\]"

    # \[ and \] prevent the shell from counting these characters
    # against the line length.

    usercolor="\[\033[35m\]"   # purple
    hostcolor="\[\033[4"$(( ( $(hostname|cksum|cut -d\  -f1|cut -d\	 -f1) / 7 ) % 7))"m\033[1;3"$(( $(hostname|cksum|cut -d\  -f1|cut -d\	 -f1) % 7))"m\]"   # bold-random-color on random-color
    timecolor="\[\033[35m\]"   # purple
    normcolor="\[\033[0m\]"    # prompt bg
    resetcolor="\[\033[0m\]"   # terminal default

    # To put in xterm titlebar, \007 ends string but \r backs over it
    # for non-parsing terminals.  Have to change this for non-parsing
    # terminals so that they won't beep at me for every line.

    title="\[\033]0;b:\w\007\r\]"

    export PS1=$resetterm""$title""$normcolor"["$usercolor"\u"$normcolor"@"$hostcolor"\h"$normcolor":"$timecolor"\A"$normcolor" \j \w]\$"$resetcolor" "