Extract feed title from index.gmi if it exists and is world readable.

gemfeed.py

@@ -8,6 +8,19 @@ import urllib.parse
 
 from feedgen.feed import FeedGenerator
 
+def is_world_readable(filename):
+    st = os.stat(filename)
+    return st.st_mode & stat.S_IROTH
+
+def get_feed_title():
+    default = "Just another Gemini feed"
+    for extension in ("gmi", "gem", "gemini"):
+        filename = "index.{}".format(extension)
+        print(filename)
+        if os.path.exists(filename) and is_world_readable(filename):
+            return extract_first_heading(filename, default)
+    return default
+
 def find_files():
     files = []
     for extension in ("gmi", "gem", "gemini"):
@@ -15,12 +28,16 @@ def find_files():
         index = "index.{}".format(extension)
         if index in files:
             files.remove(index)
-    world_readable = []
-    for filename in files:
-        st = os.stat(filename)
-        if st.st_mode & stat.S_IROTH:
-            world_readable.append(filename)
-    return world_readable
+    return [f for f in files if is_world_readable(f)]
+
+def extract_first_heading(filename, default=""):
+    with open(filename) as fp:
+        for line in fp:
+            if line.startswith("#"):
+                while line[0] == "#":
+                    line = line[1:]
+                return line.strip()
+    return default
 
 def populate_entry_from_file(filename, base_url, entry):
     url = urljoin(base_url, filename)
@@ -29,15 +46,7 @@ def populate_entry_from_file(filename, base_url, entry):
     updated = os.path.getctime(filename)
     updated = datetime.datetime.fromtimestamp(updated, tz=datetime.timezone.utc)
     entry.updated(updated)
-    with open(filename) as fp:
-        for line in fp:
-            if line.startswith("#"):
-                while line[0] == "#":
-                    line = line[1:]
-                title = line.strip()
-                break
-        else:
-            title = filename
+    title = extract_first_heading(filename, filename)
     entry.title(title)
 
 def urljoin(base, url):
@@ -51,6 +60,9 @@ def urljoin(base, url):
 
 def main():
 
+    # Get default title from index page, if there is one
+    feed_title = get_feed_title()
+
     # Parse arguments
     parser = argparse.ArgumentParser(description='Generate an Atom feed for Gemini content.')
     parser.add_argument('-a', '--author', dest='author', type=str,
@@ -64,7 +76,7 @@ def main():
     parser.add_argument('-s', '--subtitle', dest='subtitle', type=str,
             help='feed subtitle')
     parser.add_argument('-t', '--title', dest='title', type=str,
-            default="A Gemini feed", help='feed title')
+            default=feed_title, help='feed title')
     args = parser.parse_args()
 
     # Normalise base URL