Convert bibtex library to use cite keys

convert.py

#!/usr/bin/env python

import sys
import os.path as op
import re
import glob
import shutil


CITETYPES = ('@{}{{(?P<{}>[^,]+)'.format(x[0], x[1]) for x in (('Article', 'A'), ('InCollection', 'I'), ('PhdThesis', 'P'), ('Unpublished', 'U'), ('InProceedings', 'IP')))
CITERE = '|'.join(x for x in CITETYPES)

KEYTYPES = ('\s*{}\s*=\s*{{(?P<{}>[^,]+)'.format(x[0], x[1]) for x in (('Title', 'T'), ('Author', 'A'), ('Year', 'Y')))
KEYRE = '|'.join(x for x in KEYTYPES)

def convert_bibfiles(directory, bibfile):
    with open(op.join(directory, bibfile), mode='r') as f:
        indef = False
        for l in f.readlines():
            print(indef, l, end='')
            m = re.match(CITERE, l)
            if m:
                kind = m.lastgroup
                key = m.group(kind)
                indef = True
                titlewords = None
                authorname = None
                year = None
            m = re.match('}', l)
            if m:
                if not indef:
                    print(titlewords, authorname, year)
                    raise ValueError('End of key found when not in key')
                indef = False
                if titlewords is None or authorname is None or year is None:
                    print(titlewords, authorname, year)
                    raise ValueError('Did not find all required files')
                matches = glob.glob(op.join(directory, authorname, str(year))+'*')
                print(matches)
                if len(matches) == 0:
                    print('Could not find matches for {} {}', authorname, year)
                    continue
                if len(matches) == 1:
                    filename = matches[0]
                elif len(matches) > 1:
                    print('Multiple matches found')
                    done = False
                    for w in titlewords:
                        for c in matches:
                            if w in c:
                                filename = c
                                done = True
                                break
                        if done: break
                shutil.move(filename, op.join(directory, key)+'.pdf')
            if indef:
                m = re.match(KEYRE, l)
                if m:                    
                    kind = m.lastgroup
                    content = m.group(kind).rstrip('}')
                    if kind == 'T':
                        titlewords = content.split()
                    elif kind == 'A':
                        while '{' in content:
                            print(content)
                            content = re.sub('\{[^}]+\}', '*', content)
                            print(content)
                        if '{' in content: content = content.replace('{', '*')
                        if '}' in content: content = content.replace('}', '*')
                        authorname = content
                    elif kind == 'Y':
                        year = int(content)


if __name__ == '__main__':
    convert_bibfiles(sys.argv[1], 'main.bib')