Give pserve the ability top open server in browser

E.g.:

    pserve app.ini --webbrowser-open

or:

    pserve app.ini -w

pyramid/scripts/pserve.py

@@ -21,9 +21,11 @@
 import threading
 import time
 import traceback
+import webbrowser
 
 from paste.deploy import loadserver
 from paste.deploy import loadapp
+from paste.deploy.loadwsgi import loadcontext, SERVER
 
 from pyramid.compat import PY3
 from pyramid.compat import WIN
@@ -121,6 +123,11 @@ class PServeCommand(object):
         dest='monitor_restart',
         action='store_true',
         help="Auto-restart server if it dies")
+    parser.add_option(
+        '-w', '--webbrowser-open',
+        dest='webbrowser_open',
+        action='store_true',
+        help="Open a web browser to server url")
     parser.add_option(
         '--status',
         action='store_true',
@@ -334,6 +341,17 @@ def serve():
                     msg = ''
                 self.out('Exiting%s (-v to see traceback)' % msg)
 
+        if self.options.webbrowser_open:
+            def open_browser():
+                context = loadcontext(SERVER, app_spec, name=app_name, relative_to=base,
+                        global_conf=vars)
+                url = 'http://{host}:{port}/'.format(**context.config())
+                time.sleep(1)
+                webbrowser.open(url)
+            t = threading.Thread(target=open_browser)
+            t.setDaemon(True)
+            t.start()
+
         serve()
 
     def loadapp(self, app_spec, name, relative_to, **kw): # pragma: no cover