Sorted out mime initialization.

Every mime related function in main __init__.py has a flag check for the
check if initialization has already done. This is nonsense, since it
should be done implicitly early on the converter is starting.

This commit straight the things out, and initialization is done in cli
module.

Also, function guess_type was removed, since it's just a proxy for
mimetypes.guess_type function.

ebook_converter/ebooks/docx/container.py

@@ -1,10 +1,11 @@
+import mimetypes
 import os
 import shutil
 import sys
 
 from lxml import etree
 
-from ebook_converter import walk, guess_type
+from ebook_converter import walk
 from ebook_converter.ebooks.metadata import authors_to_sort_string
 from ebook_converter.ebooks.metadata import string_to_authors
 from ebook_converter.ebooks.metadata.book.base import Metadata
@@ -150,7 +151,7 @@ class DOCX(object):
         ext = name.rpartition('.')[-1].lower()
         if ext in self.default_content_types:
             return self.default_content_types[ext]
-        return guess_type(name)[0]
+        return mimetypes.guess_type(name)[0]
 
     def read_package_relationships(self):
         try:

ebook_converter/ebooks/docx/to_html.py

@@ -1,5 +1,6 @@
 import sys, os, re, math, errno, uuid, numbers
 from collections import OrderedDict, defaultdict
+import mimetypes
 
 from lxml import etree
 from lxml import html
@@ -24,8 +25,6 @@ from ebook_converter.ebooks.metadata.opf2 import OPFCreator
 from ebook_converter.utils.localization import canonicalize_lang, lang_as_iso639_1
 
 
-__license__ = 'GPL v3'
-__copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
 NBSP = '\xa0'
 
@@ -384,7 +383,7 @@ class Convert(object):
         opf.create_manifest_from_files_in([self.dest_dir])
         for item in opf.manifest:
             if item.media_type == 'text/html':
-                item.media_type = guess_type('a.xhtml')[0]
+                item.media_type = mimetypes.guess_type('a.xhtml')[0]
         opf.create_spine(['index.html'])
         if self.cover_image is not None:
             opf.guide.set_cover(self.cover_image)

ebook_converter/ebooks/docx/writer/container.py

@@ -1,9 +1,9 @@
+import mimetypes
 import textwrap, os
 
 from lxml import etree
 from lxml.builder import ElementMaker
 
-from ebook_converter import guess_type
 from ebook_converter.constants_old import numeric_version, __appname__
 from ebook_converter.ebooks.docx.names import DOCXNamespace
 from ebook_converter.ebooks.metadata import authors_to_string
@@ -179,16 +179,20 @@ class DOCX(object):
             types.append(E.Override(PartName=partname, ContentType=mt))
         added = {'png', 'gif', 'jpeg', 'jpg', 'svg', 'xml'}
         for ext in added:
-            types.append(E.Default(Extension=ext, ContentType=guess_type('a.'+ext)[0]))
-        for ext, mt in {"rels": "application/vnd.openxmlformats-package.relationships+xml",
-                        "odttf": "application/vnd.openxmlformats-officedocument.obfuscatedFont"}.items():
+            types.append(E.Default(Extension=ext,
+                                   ContentType=mimetypes.guess_type('a.' +
+                                                                    ext)[0]))
+        for ext, mt in {"rels": "application/vnd.openxmlformats-package"
+                        ".relationships+xml",
+                        "odttf": "application/vnd.openxmlformats-"
+                        "officedocument.obfuscatedFont"}.items():
             added.add(ext)
             types.append(E.Default(Extension=ext, ContentType=mt))
         for fname in self.images:
             ext = fname.rpartition(os.extsep)[-1]
             if ext not in added:
                 added.add(ext)
-                mt = guess_type('a.' + ext)[0]
+                mt = mimetypes.guess_type('a.' + ext)[0]
                 if mt:
                     types.append(E.Default(Extension=ext, ContentType=mt))
         return xml2str(types)