Improve ycdl_flask_dev helptext.

frontends/ycdl_flask/ycdl_flask_dev.py

@@ -1,8 +1,29 @@
 '''
+ycdl_flask_dev
+==============
+
 This file is the gevent launcher for local / development use.
 
-Simply run it on the command line:
-python ycdl_flask_dev.py [port]
+> ycdl_flask_dev port <flags>
+
+port:
+    Port number on which to run the server. Default 5000.
+
+--dont-create:
+    If this flag is passed, YCDL will raise an error if there is not an
+    existing ycdl.db in the current directory.
+
+--https:
+    If this flag is not passed, HTTPS will automatically be enabled if the port
+    is 443. You can pass this flag to enable HTTPS on other ports.
+    We expect to find ycdl.key and ycdl.crt in frontends/ycdl_flask/https.
+
+--localhost-only:
+    If this flag is passed, only localhost will be able to access the server.
+    Other users on the LAN will be blocked.
+
+--refresh-rate X:
+    Starts a background thread that refreshes all channels once every X seconds.
 '''
 import gevent.monkey; gevent.monkey.patch_all()
 
@@ -11,6 +32,7 @@ import gevent.pywsgi
 import os
 import sys
 
+from voussoirkit import betterhelp
 from voussoirkit import operatornotify
 from voussoirkit import pathclass
 from voussoirkit import vlogging
@@ -97,8 +119,7 @@ def main(argv):
     parser.add_argument('--refresh_rate', '--refresh-rate', dest='refresh_rate', type=int, default=None)
     parser.set_defaults(func=ycdl_flask_launch_argparse)
 
-    args = parser.parse_args(argv)
-    return args.func(args)
+    return betterhelp.single_main(argv, parser, __doc__)
 
 if __name__ == '__main__':
     raise SystemExit(main(sys.argv[1:]))