Replace commonmark.py with python-markdown

makesite.py

@@ -36,6 +36,12 @@ import json
 import datetime
 import optparse
 
+try:
+    import markdown
+    has_markdown = True
+except ImportError as err:
+    print(f'Could not import markdown: {err}. Markdown cannot be rendered!')
+    has_markdown = False
 
 def fread(filename):
     """Read file and close the file."""
@@ -100,13 +106,12 @@ def read_content(filename):
 
     # Convert Markdown content to HTML.
     if filename.endswith(('.md', '.mkd', '.mkdn', '.mdown', '.markdown')):
-        try:
         if _test == 'ImportError':
             raise ImportError('Error forced by test')
-            import commonmark
-            text = commonmark.commonmark(text)
-        except ImportError as e:
-            log('WARNING: Cannot render Markdown in {}: {}', filename, str(e))
+        if has_markdown:
+            text = markdown.markdown(text, extensions=['codehilite', 'fenced_code'])
+        else:
+            log('WARNING: Cannot render Markdown in {}: python-markdown not available', filename)
 
     # Update the dictionary with content and RFC 2822 date.
     content.update({