#!/bin/sh
#---------------------------------------------------------------------------#
# Copyright (C) 2002 The University of Melbourne.
# This file may only be copied under the terms of the GNU General
# Public License - see the file COPYING in the Mercury distribution.
#---------------------------------------------------------------------------#

# Replace any sequence of blank lines in the input with a single blank line.
# If invoked with arguments, the input is the concatenation of the named files;
# if invoked without arguments, the input is standard input.

awk '
$0 ~ /^[ \t]*$/		{
				if (empties == 0)
					print;

				empties++;
			}
$0 !~ /^[ \t]*$/	{
				empties = 0;
				print;
			}
' $@