Remove Unreferenced Bibitems in Latex/Tex File

TidyBib.py

"""
Remove Unreferenced Bibitems in Latex/Tex File
Author: Raullen Chai
Date:   2012-04-12
"""

from random import *
import re

"""
Usage:
Set BIB_FILE as your bib file
Set ARTICLE as your latex file
Put these two files and this script in the same dir
Run 'Python TidyBib.py'
Collect your new BIB_FILE in the same dir
"""

BIB_FILE = r'referenc.tex'
ARTICLE = r'author.tex'

f = open(BIB_FILE, 'r')
ref_lines = f.readlines()
f.close()

if len(ref_lines) == 0:
    print 'Empty Bib?'
    exit()

f = open(ARTICLE, 'r')
content_data = f.read()
f.close()

if len(content_data) == 0:
    print 'Empty Article?'
    exit()

f = open(BIB_FILE+'(new)', 'w')
for line in ref_lines:
    bibitems = re.findall(r'bibitem{[^}]*}', line)
    if len(bibitems) == 0:
        f.write(line)
    else:
        for x in bibitems:
            x = x.replace(r'bibitem{', '').replace(r'}', '').strip()
            if content_data.find(x) != -1:
                f.write(line)
                break
f.close()