#!/bin/sh
#
#	@(#)mdepend.sh	1.3	5/11/88 19:44:36
#
#	Do the equivalent of the 'makedepend' program, but do it right.
#
#	Usage:
#
#	makedepend [cpp-flags] [-w width] [-s magic-string] [-f makefile]
#	  [-o object-suffix]
#
#	Notes:
#
#	The C compiler used can be overridden with the environment
#	variable "CC".
#
#	The "-v" switch of the "makedepend" program is not supported.
#
#
#	This script should
#	work on both USG and BSD systems.  However, when System V.4 comes out,
#	USG users will probably have to change "silent" to "-s" instead of
#	"-" (at least, that's what the documentation implies).
#
CC=${CC:-cc}

silent='-'

TMP=${TMPDIR:-/tmp}/mdep$$
CPPCMD=${TMP}a
DEPENDLINES=${TMP}b
TMPMAKEFILE=${TMP}c
MAGICLINE=${TMP}d

trap "rm -f ${TMP}*; exit 1" 1 2 15
trap "rm -f ${TMP}*; exit 0" 1 2 13

echo " \c" > $CPPCMD
if [ `wc -c < $CPPCMD` -eq 1 ]
then
    c="\c"
    n=
else
    c=
    n="-n"
fi

echo $n "exec $CC -E$c" > $CPPCMD
chmod +x $CPPCMD

files=
makefile=
magic_string='# DO NOT DELETE'
objsuffix='.o'
width=78
while [ $# != 0 ]
do
    case "$1" in
	-D*|-I*)
	    echo $n " '$1'$c" >> $CPPCMD
	    ;;
	-w)
	    width="$2"
	    shift
	    ;;
	-s)
	    magic_string="$2"
	    shift
	    ;;
	-f)
	    makefile="$2"
	    shift
	    ;;
	-o)
	    objsuffix="$2"
	    shift
	    ;;
	-*)
	    echo "Unknown option '$1' ignored" 1>&2
	    ;;
	*)
	    files="$files $1"
	    ;;
    esac
    shift
done
echo ' $*' >> $CPPCMD

case "$makefile" in
    '')
	if [ -r makefile ]
	then
	    makefile=makefile
	elif [ -r Makefile ]
	then
	    makefile=Makefile
	else
	    echo 'no makefile or Makefile found' 1>&2
	    exit 1
	fi
	;;
    -)
	makefile=$TMPMAKEFILE
	;;
esac

echo '' > $DEPENDLINES
for i in $files
do
    $CPPCMD $i \
      | sed -n "/^#/s;^;$i ;p"
done \
  | sed -e 's|/[^/.][^/]*/\.\.||g' -e 's|/\.[^.][^/]*/\.\.||g' \
    -e 's|"||g' -e 's| \./| |' \
  | awk '{
	if ($1 != $4  &&  $2 != "#ident")
	    {
	    ofile = substr ($1, 1, length ($1) - 2) "'"$objsuffix"'"
	    print ofile, $4
	    }
	}' \
  | sort -u \
  | awk '
	    {
	    newrec = rec " " $2
	    if ($1 != old1)
		{
		old1 = $1
		if (rec != "")
		    print rec
		rec = $1 ": " $2
		}
	    else if (length (newrec) > '"$width"')
		{
		print rec
		rec = $1 ": " $2
		}
	    else
		rec = newrec
	    }
	END \
	    {
	    if (rec != "")
		print rec
	    }' \
      >> $DEPENDLINES

trap "" 1 2 13 15	# Now we are committed
case "$makefile" in
    $TMPMAKEFILE)
	;;
    *)
	rm -f Makefile.bak
	cp Makefile Makefile.bak
	;;
esac

#
#	Before we go edit the Makefile, we must make sure that magic_string
#	exists, and that it's not the last line.  Otherwise, dear old ed
#	will exit prematurely.  What a pain.
#
cat >> $makefile <<- END_OF_APPEND
	$magic_string

END_OF_APPEND
ed $silent $makefile <<- END_OF_ED_SCRIPT
	/^$magic_string/w $MAGICLINE
	/^$magic_string/,\$d
	\$r $MAGICLINE
	\$r $DEPENDLINES
	w
	q
END_OF_ED_SCRIPT

case "$makefile" in
    $TMPMAKEFILE)
	cat $TMPMAKEFILE
	;;
esac

rm -f ${TMP}*