Cut off cross importing things.

There was (and perhaps it exists in other modules, need to check) a bad
habit of importing objects out of module A into B just to be able of
import those object from module B. In this case there was import from
module config_base into module config. This commit fix this.

ebook_converter/customize/ui.py

@@ -12,6 +12,7 @@ from ebook_converter.customize import profiles
 from ebook_converter.customize import builtins
 from ebook_converter.ebooks import metadata
 from ebook_converter.utils import config as cfg
+from ebook_converter.utils import config_base
 
 
 builtin_names = frozenset(p.name for p in builtins.plugins)
@@ -23,7 +24,7 @@ class NameConflict(ValueError):
 
 
 def _config():
-    c = cfg.Config('customize')
+    c = config_base.Config('customize')
     c.add_opt('plugins', default={}, help='Installed plugins')
     c.add_opt('filetype_mapping', default={},
               help='Mapping for filetype plugins')
@@ -32,7 +33,7 @@ def _config():
     c.add_opt('disabled_plugins', default=set(), help='Disabled plugins')
     c.add_opt('enabled_plugins', default=set(), help='Enabled plugins')
 
-    return cfg.ConfigProxy(c)
+    return config_base.ConfigProxy(c)
 
 
 config = _config()

ebook_converter/ebooks/metadata/meta.py

@@ -1,6 +1,6 @@
 import os, re, collections
 
-from ebook_converter.utils.config import prefs
+from ebook_converter.utils.config_base import prefs
 from ebook_converter.constants_old import filesystem_encoding
 from ebook_converter.ebooks.metadata.opf2 import OPF
 from ebook_converter.customize.ui import get_file_type_metadata, set_file_type_metadata

ebook_converter/ebooks/metadata/opf2.py

@@ -33,7 +33,7 @@ from ebook_converter.ebooks.metadata.book.base import Metadata
 from ebook_converter.utils.date import parse_date, isoformat
 from ebook_converter.utils.localization import get_lang, canonicalize_lang
 from ebook_converter.utils.cleantext import clean_ascii_chars, clean_xml_chars
-from ebook_converter.utils.config import tweaks
+from ebook_converter.utils.config_base import tweaks
 from ebook_converter.polyglot.urllib import unquote
 
 
@@ -504,7 +504,7 @@ class TitleSortField(MetadataField):
 
 def serialize_user_metadata(metadata_elem, all_user_metadata,
                             tail='\n'+(' '*8)):
-    from ebook_converter.utils.config import to_json
+    from ebook_converter.utils.config_base import to_json
     from ebook_converter.ebooks.metadata.book.json_codec import \
         object_to_unicode, encode_is_multiple
 
@@ -654,7 +654,7 @@ class OPF(object):  # {{{
     def read_user_metadata(self):
         self._user_metadata_ = {}
         temp = Metadata('x', ['x'])
-        from ebook_converter.utils.config import from_json
+        from ebook_converter.utils.config_base import from_json
         from ebook_converter.ebooks.metadata.book.json_codec import \
             decode_is_multiple
         elems = self.root.xpath('//*[name() = "meta" and starts-with(@name,'

ebook_converter/ebooks/metadata/opf3.py

@@ -18,7 +18,7 @@ from ebook_converter.ebooks.metadata.utils import (
     create_manifest_item, ensure_unique, normalize_languages, parse_opf,
     pretty_print_opf
 )
-from ebook_converter.utils.config import from_json, to_json
+from ebook_converter.utils.config_base import from_json, to_json
 from ebook_converter.utils.date import (fix_only_date, is_date_undefined,
                                         isoformat, parse_date as parse_date_,
                                         utcnow, w3cdtf)

ebook_converter/ebooks/metadata/xmp.py

@@ -173,7 +173,7 @@ def read_series(root):
 
 
 def read_user_metadata(mi, root):
-    from ebook_converter.utils.config import from_json
+    from ebook_converter.utils.config_base import from_json
     from ebook_converter.ebooks.metadata.book.json_codec import \
         decode_is_multiple
     fields = set()
@@ -452,7 +452,7 @@ def create_series(calibre, series, series_index):
 
 
 def create_user_metadata(calibre, all_user_metadata):
-    from ebook_converter.utils.config import to_json
+    from ebook_converter.utils.config_base import to_json
     from ebook_converter.ebooks.metadata.book.json_codec import \
         object_to_unicode, encode_is_multiple
 

ebook_converter/library/__init__.py

@@ -10,7 +10,7 @@ __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
 def db(path=None, read_only=False):
     from ebook_converter.db.legacy import LibraryDatabase
-    from ebook_converter.utils.config import prefs
+    from ebook_converter.utils.config_base import prefs
     return LibraryDatabase(os.path.expanduser(path) if path else prefs['library_path'],
             read_only=read_only)
 
@@ -69,7 +69,7 @@ def generate_test_db(library_path,  # {{{
 
 
 def current_library_path():
-    from ebook_converter.utils.config import prefs
+    from ebook_converter.utils.config_base import prefs
     path = prefs['library_path']
     if path:
         path = path.replace('\\', '/')

ebook_converter/utils/config.py

@@ -7,17 +7,7 @@ from copy import deepcopy
 
 from ebook_converter import constants
 from ebook_converter import constants_old
-from ebook_converter.utils.config_base import (
-    Config, ConfigInterface, ConfigProxy, Option, OptionSet, OptionValues,
-    StringConfig, json_dumps, json_loads, make_config_dir, plugin_dir, prefs,
-    tweaks, from_json, to_json
-)
-
-
-if False:
-    # Make pyflakes happy
-    Config, ConfigProxy, Option, OptionValues, StringConfig, OptionSet,
-    ConfigInterface, tweaks, plugin_dir, prefs, from_json, to_json
+from ebook_converter.utils.config_base import json_dumps, json_loads
 
 
 def check_config_write_access():

ebook_converter/utils/formatter_functions.py

@@ -9,7 +9,7 @@ from math import trunc
 from ebook_converter import human_readable
 from ebook_converter.constants_old import DEBUG
 from ebook_converter.ebooks.metadata import title_sort
-from ebook_converter.utils.config import tweaks
+from ebook_converter.utils.config_base import tweaks
 from ebook_converter.utils.titlecase import titlecase
 from ebook_converter.utils.icu import capitalize, strcmp, sort_key
 from ebook_converter.utils.date import parse_date, format_date, now, UNDEFINED_DATE