Re: slight workaround needed to use gnus-alias

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+From: David Bremner <david@tethera.net>\r
+To: Sanjoy Mahajan <sanjoy@olin.edu>, notmuch@notmuchmail.org\r
+Subject: Re: slight workaround needed to use gnus-alias\r
+In-Reply-To: <87lh3f1fb8.fsf@insight.mit.edu>\r
+References: <87lh3f1fb8.fsf@insight.mit.edu>\r
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+Date: Thu, 12 May 2016 12:55:19 -0300\r
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+Sanjoy Mahajan <sanjoy@olin.edu> writes:\r
+\r
+>\r
+> (require 'gnus-alias)\r
+> (gnus-alias-init)\r
+> ;;; upstream version checks just for message-mode, but notmuch uses\r
+> ;;; notmuch-message-mode, which is derived from message-mode\r
+> (defun gnus-alias-ensure-message-mode ()\r
+>   "Assert that the current buffer is a message buffer."\r
+>   (when (not (derived-mode-p 'notmuch-message-mode))\r
+>     (gnus-alias-error "Must be in `message-mode' or mode derived from it. ")))\r
+> (add-hook 'message-setup-hook 'gnus-alias-determine-identity)\r
+\r
+Maybe upstream Emacs would accept something like that if it says\r
+"(derived-mode-p 'message-mode)".\r
+\r
+d\r