#!/usr/bin/env python
# -*- coding: utf-8; tab-width: 4; indent-tabs-mode: nil -*-
r'''Report on space used by readahead

Report the space used and the largest files by the /etc/readahead.d/* files.
'''


__author__  = 'Tony Nelson'
__email__   = 'tonynelson@georgeanelson.com'
__url__     = 'http://georgeanelson.com/readaheadsize.py'
__copyright__ = 'Copyright 2007 by George A. Nelson.  All rights reserved.'
__license__ = 'GPL'
__date__ = '20 Feb 2007'
__version__ = '0.1.0'


import os
import sys


rd = '/etc/readahead.d/'
min_size = 4*1024*1024


rfl = os.listdir(rd)
rfl = [f for f in rfl if not f.endswith('~')]
rfl.sort()

for rfn in rfl:
    print '%-30s' % rfn,
    sizes = []
    missing = []
    for fn in open(os.path.join(rd, rfn), 'r'):
        fn = fn[:-1]
        size = 0
        if fn[0].isdigit():
            size, fn = fn.split(' ')
            size = int(size)
        if os.path.exists(fn):
            if size == 0:
                size = os.stat(fn).st_size
            sizes.append((fn, size))
        else:
            missing.append(fn)
    sizes.sort(key=lambda v: -v[1])
    tot = sum(size[1] for size in sizes)
    print '%4d files (%4d missing) %4d MB used' % (
        len(sizes)+len(missing), len(missing), tot/(1024*1024) )
    for i in xrange(min(len(sizes),15)):
        fn, size = sizes[i]
        if size < min_size:
            break
        print '    %6d KB  %s' % (size/1024, fn)
    print