Change color in Terminal tab depending on current working directory in zsh

color_change.sh

# put this in your .zshrc
function background_danger_color_change() {
case $PWD/ in
/Users/frogor/dangerous/*)
    # uh oh, be careful in here
osascript<<END
tell application "Terminal"
    get the background color of the selected tab of the front window
    if the result is not equal to {65535, 0, 0} then
        set the background color of the selected tab of the front window to {65535, 0, 0}
    end if
end tell
END
;;
*)
    # reset it back, if we're not in dangerous land
osascript<<END
tell application "Terminal"
    get the background color of the selected tab of the front window
    if the result is equal to {65535, 0, 0} then
        set the background color of the selected tab of the front window to {5866, 5866, 5866}
    end if
end tell
END
;;
esac
}
chpwd_functions=(${chpwd_functions[@]} "background_danger_color_change")