dotool/dotoold

#!/bin/sh
if [ $# != 0 ]; then
	echo 'dotoold runs dotool reading from a pipe for dotoolc to write to.
dotoold will exit immediately if the pipe is already being read.
The path used for the pipe is $DOTOOL_PIPE else /tmp/dotool_pipe.
' >&2
	[ "$1" = -h ] || [ "$1" = --help ]; exit
fi

fifo_being_read(){
	[ -p "$1" ] && /bin/echo 1<>"$1" >"$1"
}

p="${DOTOOL_PIPE:-/tmp/dotool_pipe}"

if fifo_being_read "$p" 2> /dev/null; then
	printf %s\\n "dotoold: another instance is already reading the pipe: $p" >&2
	exit 1
fi

rm -f -- "$p" || exit 1
trap 'rm -f -- "$p"; pkill -P $$; trap - EXIT; exit' EXIT INT TERM HUP
mkfifo -m 660 "$p" || exit 1
dotool <> "$p" &
wait