bspwm/examples/panel/panel_bar

#! /bin/sh
#
# Example panel for LemonBoy's bar

while read -r line ; do
    case $line in
        S*)
            sys_infos="\\r\\f5${line#?}\\fr"
            ;;
        T*)
            title="\\c${line#?}"
            ;;
        *)
            wm_infos=""
            IFS=':'
            set - $line
            while [ $# -gt 0 ] ; do
                item=$1
                case $item in
                    [Dd_]!*)
                        # urgent desktop
                        wm_infos="$wm_infos \\b3\\f0${item#??}\\fr\\br"
                        ;;
                    D*)
                        # active desktop
                        wm_infos="$wm_infos \\u5\\b2\\f9${item#??}\\fr\\br\\ur"
                        ;;
                    d*)
                        # inactive but occupied desktop
                        wm_infos="$wm_infos \\f7${item#??}\\fr"
                        ;;
                    _*)
                        # inactive desktop
                        wm_infos="$wm_infos ${item#??}"
                        ;;
                    L*)
                        # layout
                        layout=$(printf "%s" "${item#?}" | sed 's/\(.\).*/\U\1/')
                        wm_infos="$wm_infos \\b4\\f0$layout\\br\\fr"
                        ;;
                esac
                shift
            done
            ;;
    esac
    printf "%s\n" "$wm_infos $title $sys_infos"
done