#!/bin/sh

YACC="$1"
SRC="$2"
DEST="$3"

dir=`dirname $SRC`
file=`basename $SRC`
base=`basename $SRC .y`
if [ -z "$YACC" ]; then
	echo "yacc not found"
	return;
fi
if [ -r $DEST ]; then
	if [ x`find $SRC -newer $DEST -print` != x$SRC ]; then
	    return;
    fi
fi
TOP=`pwd`
if cd $dir && $YACC -d $file; then
	sed -e "/^#/!b" -e "s|y\.tab\.h|$base.h|" y.tab.h > $base.h
	sed '/^#/ s|y\.tab\.c|$base.c|' y.tab.c > $base.c
	rm -f y.tab.c y.tab.h
fi
cd $TOP