Re: [PATCH 1/6] emacs: add helper for tag change list manipulation

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+From: Jani Nikula <jani@nikula.org>\r
+To: Michal Nazarewicz <mina86@mina86.com>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH 1/6] emacs: add helper for tag change list manipulation\r
+In-Reply-To: <xa1tipbvwdb0.fsf@mina86.com>\r
+References: <cover.1346614915.git.jani@nikula.org>\r
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+Date: Mon, 03 Sep 2012 14:06:24 +0200\r
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+\r
+On Mon, 03 Sep 2012, Michal Nazarewicz <mina86@mina86.com> wrote:\r
+> Jani Nikula <jani@nikula.org> writes:\r
+>> Add a helper to create (and optionally reverse) a list of tag changes.\r
+>> ---\r
+>>  emacs/notmuch-tag.el |   17 +++++++++++++++++\r
+>>  1 file changed, 17 insertions(+)\r
+>>\r
+>> diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el\r
+>> index 0c0fc87..c1aeb99 100644\r
+>> --- a/emacs/notmuch-tag.el\r
+>> +++ b/emacs/notmuch-tag.el\r
+>> @@ -140,6 +140,23 @@ notmuch-after-tag-hook will be run."\r
+>>    ;; in all cases we return tag-changes as a list\r
+>>    tag-changes)\r
+>>=20=20\r
+>> +(defun notmuch-tag-change-list (tags &optional reverse)\r
+>> +  "Convert TAGS into a list of tag changes.\r
+>> +\r
+>> +Add a \"+\" prefix to any tag in TAGS list that doesn't already\r
+>> +begin with a \"+\" or a \"-\". If REVERSE is non-nil, replace all\r
+>> +\"+\" prefixes with \"-\" and vice versa in the result."\r
+>> +  (mapcar (lambda (str)\r
+>> +       (let ((s (if (not (string-match "^[+-]" str))\r
+>> +                    (concat "+" str)\r
+>> +                  str)))\r
+>\r
+> (if (string-match "^[-+]" str) str (concat "+" str))\r
+>\r
+> Negation only makes things less readable IMO.\r
+\r
+Agreed.\r
+\r
+Jani.\r
+\r
+>\r
+>> +         (if reverse\r
+>> +             (concat (if (=3D (string-to-char s) ?-) "+" "-")\r
+>> +                     (substring s 1))\r
+>> +           s)))\r
+>> +     tags))\r
+>> +\r
+>> +\r
+>>  ;;\r
+>>=20=20\r
+>>  (provide 'notmuch-tag)\r
+>\r
+> --=20\r
+> Best regards,                                         _     _\r
+> .o. | Liege of Serenely Enlightened Majesty of      o' \,=3D./ `o\r
+> ..o | Computer Science,  Micha=C5=82 =E2=80=9Cmina86=E2=80=9D Nazarewicz =\r
+   (o o)\r
+> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--\r