#! /usr/bin/env python
#
# Sort bibliographies in chronological order
#

# Copyright (c) 2007, Peter Corke
#
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * The name of the copyright holder may not be used to endorse or 
#	promote products derived from this software without specific prior 
#	written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.

import Bibliography;
import BibEntry;
import BibTeX;
import string;
import sys;
import optparse;


## parse switches
usage = '''usage: %prog [options] [bibfiles]

:: Sort bibliographies in chronological order'''
p = optparse.OptionParser(usage)
p.add_option('--reverse', dest='reverseSort', action='store_true',
             help='sort into ascending data order (old at top)');
p.add_option('--resolve', dest='resolve', action='store_true',
             help='resolve cross reference entries');
p.set_defaults(reverseSort=False, resolve=False);
(opts, args) = p.parse_args()
globals().update(opts.__dict__)

if len(args) == 0 and sys.stdin.isatty():
	p.print_help();
	sys.exit(0);

count = {};

sortReturn = -1 if reverseSort else 1;

def sortByDate(a, b):
	# On input a and b are BibEntry objects
	ay = a.getYear();
	by = b.getYear();
	if ay > by:
		return -sortReturn;
	elif ay < by:
		return sortReturn;
	else:
		am = a.getMonth();
		bm = b.getMonth();
		if am > bm:
			return -sortReturn;
		elif am < bm:
			return sortReturn;
		else:
			return 0;

outbib = BibTeX.BibTeX();

if args:
	for f in args:
		bib = BibTeX.BibTeX();
		n = bib.parseFile(f);

		sys.stderr.write( "%d records read from %s\n" % (n, f) );

else:
	bib = BibTeX.BibTeX();
	bib.parseFile();

	sys.stderr.write( "%d records read from stdin\n" % len(bib) );

# sort it		
bib.sort(sortByDate);

# and output the result
for s in bib:
	s.write();