Include only 10 (by default) most recent files in the feed.

gemfeed.py

@@ -21,14 +21,16 @@ def get_feed_title():
             return extract_first_heading(filename, default)
     return default
 
-def find_files():
+def find_files(n=10):
     files = []
     for extension in ("gmi", "gem", "gemini"):
         files.extend(glob.glob("*.{}".format(extension)))
         index = "index.{}".format(extension)
         if index in files:
             files.remove(index)
-    return [f for f in files if is_world_readable(f)]
+    files = [f for f in files if is_world_readable(f)]
+    files.sort(key=os.path.getctime, reverse=True)
+    return files[0:n]
 
 def extract_first_heading(filename, default=""):
     with open(filename) as fp:
@@ -71,6 +73,8 @@ def main():
             required=True, help='base URL for feed and entries')
     parser.add_argument('-e', '--email', dest='email', type=str,
             help="feed author's email address")
+    parser.add_argument('-n', dest='n', type=int, default=10,
+            help='include N most recently created files in feed (default 10)')
     parser.add_argument('-o', '--output', dest='output', type=str,
             default="atom.xml", help='output filename')
     parser.add_argument('-s', '--subtitle', dest='subtitle', type=str,
@@ -104,7 +108,7 @@ def main():
     feed.link(href=urljoin(args.base_url, args.output), rel='self')
 
     # Add one entry per .gmi file
-    files = find_files()
+    files = find_files(args.n)
     latest_update = datetime.datetime.fromtimestamp(0, tz=datetime.timezone.utc)
     for filename in files:
         entry = feed.add_entry()