#!/usr/local/bin/perl -w

#
# btsort
#
# Reads an entire BibTeX file, sorts the entries, and spits them back out
# again.
#
# $Id: btsort 448 1997-12-21 01:45:46Z greg $
#

use strict;
use Text::BibTeX (':metatypes');

my ($filename, $structure, @options, $bibfile, $entry, %sortkey, @entries);
die "usage: btcheck file [structure [options]]\n" unless @ARGV >= 1;
($filename, $structure, @options) = @ARGV;
$structure ||= 'Bib';

$bibfile = new Text::BibTeX::File $filename or die "$filename: $!\n";
$bibfile->set_structure ('Bib', @options);

while ($entry = new Text::BibTeX::Entry $bibfile)
{
   next unless $entry->parse_ok && $entry->metatype == BTE_REGULAR;
   $entry->check;
   $sortkey{$entry} = $entry->sort_key;
   push (@entries, $entry);
}
$bibfile->close;

@entries = sort { $sortkey{$a} cmp $sortkey{$b} } @entries;
$entry->print while $entry = shift @entries;