#!/bin/sh

if [ x${SMLNJ_HOME} = x ] ; then
    BIN_DIR="/mnt/gmirror/ports/lang/sml-nj-devel/work/bin"
else
    if x${CM_PATHCONFIG} = x ] ; then
	CM_PATHCONFIG=${SMLNJ_HOME}/lib/pathconfig
	export CM_PATHCONFIG
    fi
    BIN_DIR=${SMLNJ_HOME}/bin
fi
SML=$BIN_DIR/sml

mf=""
xx=$$
tmpmf=$xx-makefile
mlscript=$xx-mlscript.sml
thisscript=$0
archos=substitute
archstring='$(ARCH)'
osstring='$(OS)'
dulist=''

trap 'rm -f $tmpmf $mlscript' 0 1 2 3 15

usage() {
    echo $thisscript: $*
    echo Usage: $thisscript '[-f makefile] [-n] [-a arch] [-o os]' project.cm target
    exit 1
}

#
# process options
#
while [ $# != 0 ] ; do
    case $1 in
    -n)
	shift
	archos=real
	;;
    -a)
	shift
	if [ $# = 0 ] ; then
	    usage
	else
	    archstring=$1
	    shift
	fi
	;;
    -o)
	shift
	if [ $# = 0 ] ; then
	    usage
	else
	    osstring=$1
	    shift
	fi
	;;
    -f)
	shift
	if [ $# = 0 ] ; then
	    usage
	else
	    mf=$1
	    shift
	fi
	if [ -f "$mf" ] ; then
	    : ok
	else
	    echo $thisscript: $mf does not exist
	    exit 1
	fi
	;;
    -D*|-U*)
	dulist="$dulist $1"
	shift
	;;
    *)
	break
	;;
    esac
done

#
# if there was no -f option, check for makefile and then Makefile
#
if [ x$mf = x ] ; then
    if [ -f makefile ] ; then
	mf=makefile
    elif [ -f Makefile ] ; then
	mf=Makefile
    else
	echo $thisscript: no makefile, no Makefile, and no -f option
	exit 1
    fi
fi

#
# get the two mandatory arguments
#
if [ $# = 2 ] ; then
    cmfile=$1
    target=$2
else
    usage
fi

if [ $archos = substitute ] ; then
    archosarg="(SOME { arch = \"${archstring}\", os = \"${osstring}\" })"
else
    archosarg=NONE
fi

#
# the delimiter strings (start and end)
#
delims="# START: ml-makedepend (${cmfile}:${target}); DO NOT DELETE!"
delime="# END  : ml-makedepend (${cmfile}:${target}); DO NOT DELETE!"

#
# remove previous result of ml-makedepend
#  (other cmfile/target combinations are unaffected)
#
awk "BEGIN { c = 1; s = \"${delims}\"; e = \"${delime}\"; }
(\$0 == s) { c = 0; next; }
(\$0 == e) { c = 1; next; }
(c == 1) { print }" <$mf >$tmpmf
cp $tmpmf $mf
rm $tmpmf

#
# construct the ML script
#
cat >$mlscript <<stop
let val archos = ${archosarg}
    val lopt = CM.sources archos "${cmfile}"
in
    case lopt of
        NONE => ignore (OS.Process.exit OS.Process.failure)
      | SOME l => let
            val s = TextIO.openOut "$tmpmf"
            fun pr { derived = true, file, class } = ()
              | pr { file, ... } = TextIO.output (s, " \\\\\\n    " ^ file)
        in
            TextIO.output (s, "${delims}\\n${target}:");
            app pr l;
            TextIO.output (s, "\\n${delime}\\n");
            TextIO.closeOut s;
            ignore (OS.Process.exit OS.Process.success)
        end
end
stop

if $SML '$smlnj/cm.cm' $dulist $mlscript ; then
    cat $tmpmf >>$mf
else
    echo $thisscript: CM dependency analysis failed
    exit 1
fi

exit 0