Removed share_open function.

Also, some more cleanup style changes has been made.

ebook_converter/utils/shared_file.py

@@ -14,66 +14,7 @@ until all open file handles are closed. You also cannot delete the containing
 directory until all file handles are closed. To get around this, rename the
 file before deleting it.
 """
-import os, sys
-
-from ebook_converter.polyglot.builtins import reraise
-from ebook_converter.constants_old import iswindows, plugins
-
-
-__license__ = 'GPL v3'
-__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
-
-# speedup, err = plugins['speedup']
-
-# if not speedup:
-    # raise RuntimeError('Failed to load the speedup plugin with error: %s' % err)
-
-valid_modes = {'a', 'a+', 'a+b', 'ab', 'r', 'rb', 'r+', 'r+b', 'w', 'wb', 'w+', 'w+b'}
-
-
-def validate_mode(mode):
-    return mode in valid_modes
-
-
-class FlagConstants(object):
-
-    def __init__(self):
-        for x in 'APPEND CREAT TRUNC EXCL RDWR RDONLY WRONLY'.split():
-            x = 'O_' + x
-            setattr(self, x, getattr(os, x))
-        for x in 'RANDOM SEQUENTIAL TEXT BINARY'.split():
-            x = 'O_' + x
-            setattr(self, x, getattr(os, x, 0))
-
-
-fc = FlagConstants()
-
-
-def flags_from_mode(mode):
-    if not validate_mode(mode):
-        raise ValueError('The mode is invalid')
-    m = mode[0]
-    random = '+' in mode
-    binary = 'b' in mode
-    if m == 'a':
-        flags = fc.O_APPEND | fc.O_CREAT
-        if random:
-            flags |= fc.O_RDWR | fc.O_RANDOM
-        else:
-            flags |= fc.O_WRONLY | fc.O_SEQUENTIAL
-    elif m == 'r':
-        if random:
-            flags = fc.O_RDWR | fc.O_RANDOM
-        else:
-            flags = fc.O_RDONLY | fc.O_SEQUENTIAL
-    elif m == 'w':
-        if random:
-            flags = fc.O_RDWR | fc.O_RANDOM
-        else:
-            flags = fc.O_WRONLY | fc.O_SEQUENTIAL
-        flags |= fc.O_TRUNC | fc.O_CREAT
-    flags |= (fc.O_BINARY if binary else fc.O_TEXT)
-    return flags
+import os
 
 
 share_open = open