#!/bin/sh
# requires simh
# based on the SDF unix50th script

udir=$HOME/unix/unix
repo=$HOME/unix/unixes

if [ ! -d "$udir" ]
then
	mkdir -p "$udir"
fi

check() {
	if [ -d "$udir/$1" ]
	then
		printf '%s' "Perform a fresh install of $1? [y/n] "
		read ans
		case "$ans" in
		y)	cp -RPp "$repo/$1" "$udir" ;;
		*) ;;
		esac
	else
		cp -RPp "$repo/$1" "$udir"
	fi
}

boot() {
	if [ ! -d "$udir/$1" ]
	then
		printf '%s\n' "You need to do a fresh install"
		sleep 2
		return 0
	else
		cd "$udir/$1"
		printf '%s\n' "To EXIT press CTRL-E and type 'q'"
		printf '\n'
		sleep 2
		"$machine" "$1-boot.ini"
	fi
}

while true
do
	clear
	printf '%s\n' "[a]	UNICS (Version Zero)	PDP-7		1969"
	printf '%s\n' "[b]	First Edition UNIX	PDP-11/20	1971"
	printf '%s\n' "[c]	Fifth Edition UNIX	PDP-11/40	1974"
	printf '%s\n' "[d]	Sixth Edition UNIX	PDP-11/45	1975"
	printf '%s\n' "[e]	Seventh Edition UNIX	PDP-11/70	1979"
	printf '%s\n' "[q]	QUIT"
	read ans
	case "$ans" in
	a)
		check v0
		machine=pdp7
		boot v0
	;;
	b)
		check v1
		machine=pdp11
		boot v1
	;;
	c)
		check v5
		machine=pdp11
		boot v5
	;;
	d)
		check v6
		machine=pdp11
		boot v6
	;;
	e)
		check v7
		machine=pdp11
		boot v7
	;;
	q)	exit 0 ;;
	*) ;;
	esac
done