Confirm an available connection method before visiting a timeline.

* twittering-mode.el: Confirm an available connection method
before visiting a timeline.
(twittering-visit-timeline): confirm connection method.

ChangeLog

@@ -29,6 +29,10 @@
 	(twittering-lookup-http-start-function): reimplemented.
 	(twittering-lookup-connection-type): new function.
 
+	* twittering-mode.el: Confirm an available connection method
+	before visiting a timeline.
+	(twittering-visit-timeline): confirm connection method.
+
 2010-05-20  Tadashi MATSUO  <tad@mymail.twin.jp>
 
 	* twittering-mode.el: The configuration of a proxy is referred via

twittering-mode.el

@@ -4953,15 +4953,16 @@ managed by `twittering-mode'."
 
 (defun twittering-visit-timeline (&optional timeline-spec initial)
   (interactive)
-  (twittering-initialize-global-variables-if-necessary)
-  (twittering-prepare-account-info)
-  (let ((timeline-spec
-	 (or timeline-spec
-	     (twittering-read-timeline-spec-with-completion
-	      "timeline: " initial t))))
-    (when timeline-spec
-      (twittering-verify-credentials)
-      (switch-to-buffer (twittering-get-managed-buffer timeline-spec)))))
+  (when (twittering-lookup-http-start-function)
+    (twittering-initialize-global-variables-if-necessary)
+    (twittering-prepare-account-info)
+    (let ((timeline-spec
+	   (or timeline-spec
+	       (twittering-read-timeline-spec-with-completion
+		"timeline: " initial t))))
+      (when timeline-spec
+	(twittering-verify-credentials)
+	(switch-to-buffer (twittering-get-managed-buffer timeline-spec))))))
 
 (defun twittering-other-user-timeline ()
   (interactive)