installer

#!/bin/sh -e
#
# (Un)installation script for the Makefile to call; the script is a bit complex
# to put in the Makefile. It tries to do stuff as a normal user and only falls
# back to root if necessary.

if test -z "$MAKEFILE"; then
	echo >&2 'Only run this command through make install'
	exit 1
fi

ask_to_proceed() {
	while :; do
		printf 'Do you wish to proceed? (yes/no) '
		read -r answer || exit 0
		case "$answer" in
		[Yy]*)	return 0 ;;
		[Nn]*)	exit 0 ;;
		esac
	done
}

do_or_sudo() {
	( exec "$@" ) || (
		: Trying again as super user
		exec sudo "$@"
	)
}

case "$1" in
install)
	echo
	echo "Installing executable to $EXE_INSTALL"
	echo " Installing game data to $DATA_INSTALL"
	echo "    Installing manual to $MAN_INSTALL"
	ask_to_proceed
	set -x
	do_or_sudo mkdir -p "$(dirname "$EXE_INSTALL")"
	do_or_sudo cp "$EXE" "$EXE_INSTALL"
	do_or_sudo mkdir -p "$DATA_INSTALL"
	do_or_sudo cp -fr "$DATA_DIR"/* LICENSE "$DATA_INSTALL"
	do_or_sudo mkdir -p "$(dirname "$MAN_INSTALL")"
	do_or_sudo cp -f "$MAN_PAGE" "$MAN_INSTALL"
	;;
uninstall)
	echo
	echo "Removing executable at $EXE_INSTALL"
	echo " Removing game data at $DATA_INSTALL"
	echo "    Removing manual at $MAN_INSTALL"
	ask_to_proceed
	set -x
	do_or_sudo rm -f "$EXE_INSTALL"
	do_or_sudo rm -rf "$DATA_INSTALL"
	do_or_sudo rm -f "$MAN_INSTALL"
	;;
esac