#!/bin/sh

# SPDX-License-Identifier: BSD-2-Clause

# Our input is the output of something like:
#
#	(cd ${SRCTOP} &&
#	find *bin etc lib* -name Makefile |
#	xargs grep '^PACKAGE[[:space:]]*=' )
#
# With some cleanup and looks like:
#
#	usr.bin/ofed/libibverbs/Makefile:PACKAGE=FreeBSD-rdma
#	usr.bin/last/Makefile:PACKAGE=acct
#	usr.bin/lastcomm/Makefile:PACKAGE=acct
#	usr.bin/users/Makefile:PACKAGE=acct
#	usr.bin/who/Makefile:PACKAGE=acct
#	usr.sbin/ac/Makefile:PACKAGE=acct
#	usr.sbin/accton/Makefile:PACKAGE=acct
#	usr.sbin/lastlogin/Makefile:PACKAGE=acct
#	..
#
# which we use to populate $PACKAGES/*/Makefile.depend
# and $PACKAGES/Makefile.depend to make it easier to keep
# Makefile.depend files throughout the tree up-to-date.
#
# The result is not ideal, as we do not (yet) take into account all
# the MK_* knobs that can impact DIRDEPS.
#

Mydir=`dirname $0`

while :
do
    case "$1" in
    *=*) eval "$1"; shift;;
    *) break;;
    esac
done

to_reldir() {
    sed "s,$SRCTOP/,,"
}

SRCTOP=${SRCTOP:-$(realpath $Mydir/../../..)}
PACKAGES=${PACKAGES:-$(realpath $Mydir/../..)}
case "$PACKAGES" in
/*) ;;
*) PACKAGES=$SRCTOP/$PACKAGES;;
esac

script_name=$(realpath $0 | to_reldir)

start_depend() {
    depfile=$1

    mkdir -p ${depfile%/*}
    cat <<EOF > $depfile
# Generated by $script_name

DIRDEPS= \\
EOF
}

end_depend() {
    depfile=$1

    cat <<EOF >> $depfile

.include <dirdeps.mk>
EOF
}

start_depend $PACKAGES/Makefile.depend || exit 1
sort -t= -k2 "$@" | sed 's,/Makefile:PACKAGE=, ,' |
(
    lpackage=
    while read reldir package
    do
        case "$package" in \
	lib?{LIB}) package=${reldir##*/};;
	lib?{LIB:tl}) package=`echo ${reldir##*/} | tr 'A-Z' 'a-z'`;;
	esac
	if test "$package" != "$lpackage"; then \
	    test -z "$lpackage" || end_depend $ddeps
	    target=$PACKAGES/$package
            ddeps=$target/Makefile.depend
            start_depend $ddeps
	    lpackage=$package
	    echo "	$target \\"
	fi
	echo "	$reldir \\" >> $ddeps
    done
    end_depend $ddeps
) | to_reldir >> $PACKAGES/Makefile.depend
end_depend $PACKAGES/Makefile.depend