#! /bin/sh

# $NetBSD: grab-version.sh,v 1.3 2026/07/10 21:54:30 kre Exp $

# Free unlicensed public-domain code.
# Found under a bush behind an outdoor dunny in Wagga Wagga (mid 1800's).
# Your risk entirely if you use it.

case "$#" in
1)	;;
*)	printf >&2 'Usage: %s NETBSDSRCDIR\n' "${0##*/}"; exit 1;;
esac

# GEN='$NetBSD: grab-version.sh,v 1.3 2026/07/10 21:54:30 kre Exp $'
# GEN=${GEN#'$NetBSD: '}
# GEN=${GEN%' Exp $'}

VERSION_FILE="${1}/sys/sys/param.h"

: ${SED:=sed}
: ${DATE:=date}

if ( O=$(eval "printf %s $'X\tY'") && [ "$O" = 'X	Y' ] ) >/dev/null 2>&1
then
	# Use this when possible, it is more obvious what is happening.
	VERS_MATCH=$'^#define[ \t][ \t]*__NetBSD_Version__[ \t][ \t]*[1-9]'
	IFS=$' \t'
else
	# The same as above, avoiding use of $'...' (for old shells)
	VERS_MATCH='^#define[ 	][ 	]*__NetBSD_Version__[ 	][ 	]*[1-9]'
	IFS=' 	'
fi

VL=$( "${SED}" -n							\
	-e "/${VERS_MATCH}/ {"						\
	-e	p							\
	-e	q							\
	-e }			"${VERSION_FILE}"
     )	||
{
	printf >&2 '%s: No __NetBSD_Version__ in %s\n'			\
			"${0##*/}" "${VERSION_FILE}"
	exit 1
}

# See IFS setting above (this is the sole occasion it is used)
read -r def nbv version comment <<!EOF!
${VL}
!EOF!

format()
{
	printf >&2 '%s: Badly formatted version line from %s:\n\t%s\n'	\
		"${0##*/}" "${VERSION_FILE}" "${VL}"
	exit 1
}

if [ "${def}" != '#define' ] || [ "${nbv}" != __NetBSD_Version__ ]
then
	format
fi

comment=${comment#* }
comment=${comment% *}
case "${comment}" in
*[/*]*)	format		;;
'NetBSD '[1-9]*)	comment="${comment#NetBSD }";;
*)	format		;;
esac

case "${version}" in
*[!0-9]*)	format	;;
[1-9]*[0-9])		;;
*)		format	;;
esac

printf "'%s'\n" '-DUSER_OSTYPE_VALUE="NetBSD"'
printf "'%s'\n" "-DUSER_OSREVISION_VALUE=${version}"
printf "'-DUSER_OSRELEASE_VALUE=\"%s\"'\n" "${comment}"
printf "'-DUSER_BUILDTIME_VALUE=\"%s%s\"'\n"			\
    "$( TZ=UTC "${DATE}" -u					\
	${MKREPRO_TIMESTAMP:+-r "${MKREPRO_TIMESTAMP}"}		\
	'+%Y-%m-%d %T UTC' )"					\
    "${MKREPRO_TIMESTAMP:+ !}"