#!/bin/sh
#
# JavaSig - generate method signature files
#
# This script uses javap to generate a method signature file for each
# source file.  These are stored in .sig files.
#
# If the signature hasn't changed from the last time this script was run,
# the file is not updated.  This means you can use .sig files in makefile
# dependency rules, so that clients of a class get recompiled only when
# its interface changes, and not for every piddling implementation or
# documentation change.
#
# Copyright (C) 1996 by Jef Poskanzer <jef@mail.acme.com>.  All rights reserved.

tmp=/tmp/jcs.$$
rm -f $tmp

for a in $* ; do
    case "$a" in
	-*)
	;;
	*.java)
	s=`echo "$a" | sed -e 's/\.java$/.sig/'`
	javap `JavaClass $a` > $tmp
	# Ought to put in public static final variables too, since they
	# get inlined.
	if [ -f "$s" ] ; then
	    if cmp $tmp "$s" > /dev/null 2>&1 ; then
		# Unchanged, do nothing.
		echo > /dev/null	# null command for broken shells
	    else
		rm -f "$s"
		mv $tmp "$s"
	    fi
	else
	    mv $tmp "$s"
	fi
	;;
    esac
done

rm -f $tmp