#!/usr/local/bin/perl
#
# slim-bibl-file -- return a smaller bib file
# Copyright (C) 1994, 1995 Bryan O'Sullivan
#
# Author: Andrew Condon <afcondon@dsg.cs.tcd.ie>
# Modified-By: Bryan O'Sullivan <bos@serpentine.com>
# $Revision: 1.2 $
# $Date: 1995/05/23 22:19:56 $
# $Source: /u/other/ugrad/bosullvn/lib/elisp/bibl-mode/RCS/slim-bibl-file,v $
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# COMMENTARY:
#
# Sort of grep through a bibliography file, producing another one of
# the same sort, but only containing entries which have the given
# keywords (as command line arguments) in them.
#
# If you're using this in a CGI setting, make sure that bibl-grep
# knows exactly where this file is.

foreach $i (0 .. $#ARGV){
    $keywords{$ARGV[$i]} = 1;
}
	
# Get past the header glop.

while (<STDIN>) {
    print;
    last if ($_ eq "\f\n");
}

$*=1;

$/="";

while (<STDIN>) {
    $record=$_;

    if ($keywords = /^Keywords:\s(.*)\n/) {
	$keywords = $1;
	$keywords =~ tr/A-Z/a-z/;
	foreach $i (split(/, /, $keywords)) {
	    if ($keywords{$i}) { 
		print $record;
		last;
	    }
	}
    }
}