Exclude Markdown files and READMEs from theme.

Account for capitalization differences and all supported Markdown extensions. Fixes mkdocs#1766.

Author: waylan

docs/about/release-notes.md

@@ -56,6 +56,7 @@ your global navigation uses more than one level, things will likely be broken.
 
 ### Other Changes and Additions to Version 1.1
 
+* Bugfix: Exclude Markdown files and READMEs from theme. (#1766).
 * Bugfix: Account for encoded URLs (#1670).
 * Bugfix: Ensure theme files do not override `docs_dir` files (#1671).
 * Bugfix: Do not normalize URL fragments (#1655).

mkdocs/structure/files.py

@@ -66,10 +66,11 @@ def css_files(self):
     def add_files_from_theme(self, env, config):
         """ Retrieve static files from Jinja environment and add to collection. """
         def filter(name):
-            patterns = ['.*', '*.py', '*.pyc', '*.html', 'mkdocs_theme.yml']
+            patterns = ['.*', '*.py', '*.pyc', '*.html', '*readme*', 'mkdocs_theme.yml']
+            patterns.extend('*{0}'.format(x) for x in utils.markdown_extensions)
             patterns.extend(config['theme'].static_templates)
             for pattern in patterns:
-                if fnmatch.fnmatch(name, pattern):
+                if fnmatch.fnmatch(name.lower(), pattern):
                     return False
             return True
         for path in env.list_templates(filter_func=filter):

mkdocs/tests/structure/file_tests.py

@@ -322,7 +322,9 @@ def test_files(self):
     @tempdir(files=[
         'base.html',
         'favicon.ico',
-        'style.css'
+        'style.css',
+        'foo.md',
+        'README'
     ])
     def test_add_files_from_theme(self, tdir, ddir):
         config = load_config(docs_dir=ddir, theme={'name': None, 'custom_dir': tdir})