Fix #1201

CHANGES.txt

@@ -57,6 +57,7 @@ Features
 Bugfixes
 --------
 
+* Make markdown extensions not break when markdown is not installed (Issue #1201)
 * hidetitle now works in posts, too (Issue #1188)
 * Refactoring of post translation checking (Issue #1194)
 * Trigger rebuild on gallery changes in auto mode (Issue #1180)

nikola/plugins/compile/markdown/mdx_gist.py

@@ -117,11 +117,18 @@
 
 '''
 from __future__ import unicode_literals, print_function
-from markdown.extensions import Extension
+
+try:
+    from markdown.extensions import Extension
+    from markdown.inlinepatterns import Pattern
+    from markdown.util import AtomicString
+    from markdown.util import etree
+except ImportError:
+    # No need to catch this, if you try to use this without Markdown,
+    # the markdown compiler will fail first
+    Extension = Pattern = object
+
 from nikola.plugin_categories import MarkdownExtension
-from markdown.inlinepatterns import Pattern
-from markdown.util import AtomicString
-from markdown.util import etree
 from nikola.utils import get_logger, req_missing, STDERR_HANDLER
 
 LOGGER = get_logger('compile_markdown.mdx_gist', STDERR_HANDLER)

nikola/plugins/compile/markdown/mdx_nikola.py

@@ -27,9 +27,15 @@
 """Markdown Extension for Nikola-specific post-processing"""
 from __future__ import unicode_literals
 import re
-from markdown.postprocessors import Postprocessor
+try:
+    from markdown.postprocessors import Postprocessor
+    from markdown.extensions import Extension
+except ImportError:
+    # No need to catch this, if you try to use this without Markdown,
+    # the markdown compiler will fail first
+    Postprocessor = Extension = object
+
 from nikola.plugin_categories import MarkdownExtension
-from markdown.extensions import Extension
 
 
 class NikolaPostProcessor(Postprocessor):

nikola/plugins/compile/markdown/mdx_podcast.py

@@ -40,9 +40,14 @@
 '''
 
 from nikola.plugin_categories import MarkdownExtension
-from markdown.extensions import Extension
-from markdown.inlinepatterns import Pattern
-from markdown.util import etree
+try:
+    from markdown.extensions import Extension
+    from markdown.inlinepatterns import Pattern
+    from markdown.util import etree
+except ImportError:
+    # No need to catch this, if you try to use this without Markdown,
+    # the markdown compiler will fail first
+    Pattern = Extension = object
 
 PODCAST_RE = r'\[podcast\](?P<url>.+)\[/podcast\]'