correctly determine canonical URLs for subfolders

build.py

@@ -32,9 +32,6 @@ for (dirpath, _, filenames) in os.walk(static_directory):
     shutil.copy2(source, dest)
 
 
-out_filenames = []
-
-
 for (dirpath, _, filenames) in os.walk(input_directory):
   for filename in filenames:
     markdown_filename = os.path.join(dirpath, filename)
@@ -59,20 +56,19 @@ for (dirpath, _, filenames) in os.walk(input_directory):
 
     out_filename = os.path.basename(markdown_filename).replace('.md', '.html')
 
+    out_dirpath = os.path.join(output_directory, dirpath)
+    out_dirpath = out_dirpath.replace('/content', '', 1)
+    out_fullpath = os.path.join(out_dirpath, out_filename)
+    page_url = out_fullpath.replace('output/', '', 1)
+    if page_url.endswith('index.html'):  # strip off index.html
+      page_url = page_url[:-len('index.html')]
+
     html = markdown.markdown(text, extensions=md_extensions, output_format='html5')
     output = template.replace('__TITLE_GOES_HERE__', title)
     output = output.replace('__CONTENT_GOES_HERE__', html)
-
-    page_url = out_filename
-    if page_url.endswith('index.html'):  # strip off index.html
-      page_url = page_url[:-len('index.html')]
     output = output.replace('__PAGE_URL_GOES_HERE__', page_url)
 
-    out_filenames.append(out_filename)
-    out_dirpath = os.path.join(output_directory, dirpath)
-    out_dirpath = out_dirpath.replace('/content', '', 1)
     os.makedirs(out_dirpath, exist_ok=True)
-    out_fullpath = os.path.join(out_dirpath, out_filename)
     print_file(markdown_filename, out_fullpath)
     out_file = open(out_fullpath, 'w')
     out_file.write(output)