fifoify -- replace every .xz file on the command line by a fifo with an xz process attached

fifoify.sh

#!/bin/sh

new_args="${1}"
shift
for arg; do
	case "${arg}" in
	(*".xz")
		repl="${arg%.xz}"
		if ! test -e "${repl}"; then
			mkfifo "${repl}"
		fi
		if test -p "${repl}"; then
			fifos="'${repl}' ${fifos}"
			new_args="${new_args} '${repl}'"
			xz -dc "${arg}" > "${repl}" &
			pids="${!} ${pids}"
		else
			new_args="${new_args} '${arg}'"
		fi
		;;
	(*)
		new_args="${new_args} '${arg}'"
		;;
	esac
done

eval "${new_args}"
for i in ${pids}; do
	wait "${i}"
done
eval "rm -f -- ${fifos}"