add 'wormhole send --text -' to read message from stdin

NEWS.md

@@ -7,6 +7,7 @@ User-visible changes in "magic-wormhole":
   current (0.5.0) server, instead of an ugly stack trace. Unfortunately 0.4.0
   receivers still display the traceback, since they don't check the welcome
   message before using a missing API.
+* Fix `wormhole send --text -` to read the text message from stdin.
 
 ## Release 0.5.0 (07-Oct-2015)
 

src/wormhole/scripts/cmd_send.py

@@ -13,6 +13,9 @@ def send(args):
     assert isinstance(args.relay_url, type(u""))
 
     text = args.text
+    if text == "-":
+        print("Reading text message from stdin..")
+        text = sys.stdin.read()
     if not text and not args.what:
         text = six.moves.input("Text to send: ")
 

src/wormhole/scripts/runner.py

@@ -68,7 +68,7 @@ p = subparsers.add_parser("send",
                           description="Send text message or file",
                           usage="wormhole send [FILENAME]")
 p.add_argument("--text", metavar="MESSAGE",
-               help="text message to send, instead of a file")
+               help="text message to send, instead of a file. Use '-' to read from stdin.")
 p.add_argument("--code", metavar="CODE", help="human-generated code phrase",
                type=type(u""))
 p.add_argument("-0", dest="zeromode", action="store_true",