Only write to stdout when asked, to facilitate use in scripts instead of as a command line tool.

gemfeed.py

@@ -90,7 +90,8 @@ def populate_entry_from_file(filename, base_url, entry):
     title = extract_first_heading(filename, filename)
     entry.title(title)
 
-def build_feed(base_url, output="atom.xml", n=10, title="", subtitle="", author="", email=""):
+def build_feed(base_url, output="atom.xml", n=10, title="", subtitle="",
+        author="", email="", verbose=False):
     """
     Build an Atom feed for all world readable Gemini files in the current
     directory, and write it to atom.xml.
@@ -118,18 +119,21 @@ def build_feed(base_url, output="atom.xml", n=10, title="", subtitle="", author=
     # Add one entry per .gmi file
     files = find_files(n)
     if not files:
-        print("No world-readable Gemini content found! :(")
+        if verbose:
+            print("No world-readable Gemini content found! :(")
         return
     for n, filename in enumerate(files):
         entry = feed.add_entry()
         populate_entry_from_file(filename, base_url, entry)
-        print("Adding {} with title '{}'...".format(filename, entry.title()))
         if n == 0:
             feed.updated(entry.updated())
+        if verbose:
+            print("Adding {} with title '{}'...".format(filename, entry.title()))
 
     # Write file
     feed.atom_file(output, pretty=True)
-    print("Wrote Atom feed to {}.".format(output))
+    if verbose:
+        print("Wrote Atom feed to {}.".format(output))
 
 def main():
     """
@@ -148,6 +152,8 @@ def main():
             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('-q', '--quiet', dest='verbose', action="store_false",
+            help='Write nothing to stdout under non-error conditions')
     parser.add_argument('-s', '--subtitle', dest='subtitle', type=str,
             help='feed subtitle')
     parser.add_argument('-t', '--title', dest='title', type=str,
@@ -164,7 +170,7 @@ def main():
 
     # Build the feed
     build_feed(args.base_url, args.output, args.n, args.title, args.subtitle,
-            args.author, args.email)
+            args.author, args.email, args.verbose)
 
 if __name__ == "__main__":
     main()