#!/bin/sh
# SP1 Aufgabe "Clash" in POSIX shell (meta-circular style)
# $Id: clash.sh,v 1.2 2024/04/13 11:21:42 oj14ozun Exp oj14ozun $
# https://wwwcip.cs.fau.de/~oj14ozun/src+etc/clash.sh

while true
do
    printf "%s> " "$PWD"
    read -r INPUT_LINE

    CMD="$(echo $INPUT_LINE | sed 's/ .*$//')"
    REST="$(echo $INPUT_LINE | sed 's/^.*? //')"

    if [ "$CMD" = 'cd' ]
    then
	cd "${REST%% }"
    elif [ "$CMD" = 'jobs' ]
    then
	jobs
    else
	LAST="$CMD"
	EXEC="$(for TOK in $REST
	do
		printf " \'%s\'" "$TOK"
	done)"

	if [ "$LAST" = "&" ]
	then
	    eval "$EXEC" &
	else
	    eval "$EXEC \"$LAST\""
	fi
    fi
done