# Copyright (c) 2009 The Chromium Embedded Framework Authors. All rights
# reserved. Use of this source code is governed by a BSD-style license that
# can be found in the LICENSE file.

import pickle
from optparse import OptionParser
from os.path import isfile
import sys
from file_util import *
from patch_util import *


# cannot be loaded as a module
if __name__ != "__main__":
    sys.stderr.write('This file cannot be loaded as a module!')
    sys.exit()
    

# parse command-line options
disc = """
This utility applies patch files.
"""

parser = OptionParser(description=disc)
parser.add_option('--patch-dir', dest='patchdir', metavar='DIR',
                  help='source directory for patch files')
(options, args) = parser.parse_args()

# the patchdir option is required
if options.patchdir is None:
    parser.print_help(sys.stdout)
    sys.exit()

# normalize the directory value
patchdir = options.patchdir.replace('\\', '/')
if patchdir[-1] != '/':
    patchdir += '/'

# check if the patching should be skipped
if isfile(patchdir + 'NOPATCH'):
    nopatch = True
    sys.stdout.write('NOPATCH exists -- files have not been patched.\n')
else:
    nopatch = False
    # locate the patch configuration file
    patchcfg = patchdir + 'patch.cfg'
    if not isfile(patchcfg):
        sys.stderr.write('File '+patchcfg+' does not exist.\n')
        sys.exit()
    
    scope = {}
    execfile(patchcfg, scope)
    patches = scope["patches"]
    
    for name in patches.keys():
        file = patchdir+'patches/'+name+'.patch'
        if not isfile(file):
            sys.stderr.write('Patch file '+file+' does not exist.\n')
        else:
            sys.stderr.write('Reading patch file '+file+'\n')
            dir = patches[name]
            patchObj = from_file(file)
            patchObj.apply(dir)
        
# read the current include file, if any
incfile = patchdir + 'patch_state.h'
if nopatch:
    incnew = """// This file is generated by the patch tool and should not be edited manually.
#ifndef _PATCH_STATE_H
#define _PATCH_STATE_H
// No patches have been applied to the Chromium/WebKit source base.
#define CEF_PATCHES_APPLIED    0
#endif // _PATCH_STATE_H
"""
else:
    incnew = """// This file is generated by the patch tool and should not be edited manually.
#ifndef _PATCH_STATE_H
#define _PATCH_STATE_H
// Patches have been applied to the Chromium/WebKit source base.
#define CEF_PATCHES_APPLIED    1
#endif // _PATCH_STATE_H
"""

inccur = ''
if isfile(incfile):
    inccur = read_file(incfile)
    
if inccur != incnew:
    sys.stdout.write('Writing file '+incfile+'.\n')
    write_file(incfile, incnew)