macOS Terminal bash_profile script to color windows by directory

.bash_profile

set_terminal_color() {
  osascript -e "tell application \"Terminal\"
set current settings of window 1 to settings set \"$window_color\"
end tell"
}
colorize_terminal() {
  update_terminal_cwd
  if [ "$PWD" != "$MYOLDPWD" ]; then
    MYOLDPWD="$PWD";
    x="$PWD"
    while [ "$x" != "/" ] ; do
      if [[ `find "$x" -maxdepth 1 -name .window_color` ]]; then
        window_color=`cat $x/.window_color`
        set_terminal_color
        break
      fi
      x=`dirname "$x"`
    done
    if [ "$x" == "/" ] ; then
      window_color=`defaults read com.apple.Terminal "Default Window Settings"`
      set_terminal_color
    fi
  fi
}
#
export PROMPT_COMMAND=colorize_terminal
# A convenience command to set the color for the current directory
dircolor() {
  window_color=`sed -e 's/^"//' -e 's/"$//' <<<"$1"`
  set_terminal_color
  echo "$window_color" > .window_color
  MYOLDPWD="$PWD";
}

Just stick it in your .bash_profile and use dircolor something to set the window color for the directory.