#!/bin/sh

#

prepend_path() {

	local _pname _pname_prepend="${1}" IFS=":";

	for _pname in ${PATH}; do

		if [ "${_pname}" = "${_pname_prepend}" ]; then

			return;

		fi;

	done; export PATH="${_pname_prepend}${PATH:+:${PATH}}";

};

prepend_path /bin;

if [ "${1}" = -h ]; then

	echo "usage: $0 [drive_letter [dirname]]"; exit 0;

elif [ ${#} -eq 0 ]; then

	PWD_ABSOLUTE="$(cygpath -am .)" || exit 1;

	MIDIPIX_DRIVE="${PWD_ABSOLUTE%:*}";

	MIDIPIX_PNAME="${PWD_ABSOLUTE#${MIDIPIX_DRIVE}:}";

	unset PWD_ABSOLUTE;

else

	MIDIPIX_DRIVE="${1}"; MIDIPIX_PNAME="${2}";

fi;

UNAME_OS="$(uname -o)" || exit 2;

if [ "${MIDIPIX_DRIVE#*[ 	]*}" != "${MIDIPIX_DRIVE}" ]\

|| [ "${MIDIPIX_PNAME#*[ 	]*}" != "${MIDIPIX_PNAME}" ]; then

	echo "Error: drive_letter/dirname must not contain SP (\` ') or VT (\`\\\t') characters.";

	exit 3;

fi;

MIDIPIX_PATH=/${MIDIPIX_DRIVE}${MIDIPIX_PNAME:+/${MIDIPIX_PNAME#/}};

MIDIPIX_PATH=${MIDIPIX_PATH%/};

if [ ! -d /proc/cygdrive${MIDIPIX_PATH} ]; then

	echo "Error: Midipix path non-existent or invalid (\`${MIDIPIX_PATH}'.)";

	exit 4;

else

	if [ -f /proc/cygdrive${MIDIPIX_PATH}/bin/libpsxscl.log ]; then

		echo Found libpsxscl.log, copying to /proc/cygdrive${MIDIPIX_PATH}/bin/libpsxscl.last.

		cp /proc/cygdrive${MIDIPIX_PATH}/bin/libpsxscl.log	\

			/proc/cygdrive${MIDIPIX_PATH}/bin/libpsxscl.last || exit 5;

	fi;

	OLD_CYGDRIVE_PREFIX="$(readlink /proc/cygdrive)" || exit 6;

	echo "Midipix drive letter.....: ${MIDIPIX_DRIVE}";

	echo "Midipix pathname.........: ${MIDIPIX_PNAME}";

	echo "Absolute Midipix pathname: ${MIDIPIX_PATH}";

	echo --------------------------------------------------------

	echo WARNING: The cygdrive path prefix will be changed to /

	echo whilst the Midipix shell window is running. It will be

	echo reset to its previous value of ${OLD_CYGDRIVE_PREFIX} after it exits.

	echo --------------------------------------------------------

	if [ "${UNAME_OS}" = "Msys" ]; then

		export MSYS2_ARG_CONV_EXCL="*";

	fi;

	mintty -h always -e /bin/sh -c "

		set -o errexit; stty raw -echo;

		mount --change-cygdrive-prefix /;

		cd ${MIDIPIX_PATH}/native/bin;

		export PATH=${MIDIPIX_PATH}/native/bin:${MIDIPIX_PATH}/native/lib;

		./ntctty.exe -e chroot //${MIDIPIX_PATH#/}/native /bin/bash";

	echo --------------------------------------------------------

	echo Resetting cygdrive path prefix to ${OLD_CYGDRIVE_PREFIX}.

	echo --------------------------------------------------------

	mount --change-cygdrive-prefix "${OLD_CYGDRIVE_PREFIX}";

fi;