monsterwm invoked via this script

wmrun.sh

#!/usr/bin/env sh

# from c00kiemon5ter's config here https://github.com/c00kiemon5ter/scripts/blob/master/wmrun.sh
# adapted for bipolarbar

: "${wm:=monsterwm}"
: "${ff:="/tmp/${wm}.fifo"}"

trap 'rm -f "$ff"' TERM INT EXIT
[ -p "$ff" ] || { rm -f "$ff"; mkfifo -m 600 "$ff"; }

# spawn a statusbar
while read -t 60 -r line || true; do
    echo "$line" | grep -qEx "(([[:digit:]]+:){4,6}[[:digit:]]+ ?)+[|]?.*" && prev="$line" || line=
    statusinfo.sh ${line:-$prev}
done < "$ff" | bipolarbar &

bipolarbar_status &

"$wm" > "$ff"