readers: Add debugging logging to read_file

pelican/readers.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals, print_function
 
+import logging
 import os
 import re
 try:
@@ -35,6 +36,8 @@ from pelican.contents import Page, Category, Tag, Author
 from pelican.utils import get_date, pelican_open
 
 
+logger = logging.getLogger(__name__)
+
 METADATA_PROCESSORS = {
     'tags': lambda x, y: [Tag(tag, y) for tag in x.split(',')],
     'date': lambda x, y: get_date(x),
@@ -343,6 +346,8 @@ def read_file(base_path, path, content_class=Page, fmt=None,
     path = os.path.abspath(os.path.join(base_path, path))
     source_path = os.path.relpath(path, base_path)
     base, ext = os.path.splitext(os.path.basename(path))
+    logger.debug('read file {} -> {}'.format(
+            source_path, content_class.__name__))
     if not fmt:
         fmt = ext[1:]