Re: [PATCH 2/3] emacs: `notmuch-show-buttonize-links' only `notmuch-show's a message...

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+To: Pieter Praet <pieter@praet.org>,\r
+       Jameson Graef Rollins <jrollins@finestructure.net>\r
+Subject: Re: [PATCH 2/3] emacs: `notmuch-show-buttonize-links' only\r
+       `notmuch-show's a message if it exists\r
+In-Reply-To: <1326389025-18877-2-git-send-email-pieter@praet.org>\r
+References: <874nw0ltwz.fsf@praet.org>\r
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+       (x86_64-pc-linux-gnu)\r
+From: David Edmondson <dme@dme.org>\r
+Date: Mon, 16 Jan 2012 11:43:25 +0000\r
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+--=-=-=\r
+Content-Type: text/plain\r
+\r
+On Thu, 12 Jan 2012 18:23:44 +0100, Pieter Praet <pieter@praet.org> wrote:\r
+> +      (make-text-button string-start string-end\r
+>                      'action `(lambda (arg)\r
+> -                               (notmuch-show ,(match-string-no-properties 0)))\r
+> +                               (notmuch-show-if-found ,message-id))\r
+\r
+I like this, but wonder idly about the performance impact (not enough to\r
+suggest denying it, though).\r
+\r
+> +(defun notmuch-show-found-target-p (target)\r
+> +  (let ((args `("count" ,target)))\r
+> +    (> (string-to-number (substring\r
+> +      (with-output-to-string\r
+> +        (apply 'call-process notmuch-command nil standard-output nil args))\r
+> +      0 -1)) 0)))\r
+\r
+`substring' seems unnecessary, presuming that it's to get rid of the\r
+carriage return.\r
+\r
+> +(defun notmuch-show-if-found (target &rest args)\r
+> +  (if (notmuch-show-found-target-p target nil)\r
+> +      (notmuch-show target args)\r
+> +    (error (format "Can't find target: %s" target))))\r
+\r
+`error' will format strings without help.\r
+\r
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