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

diff --git a/9a/7823b8fcae43a4501f6bc024d8cfdd9d6c27b8 b/9a/7823b8fcae43a4501f6bc024d8cfdd9d6c27b8
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@@ -0,0 +1,104 @@
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+From: Jani Nikula <jani@nikula.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 1/6] emacs: add helper for tag change list manipulation\r
+Date: Sun,  2 Sep 2012 22:58:00 +0300\r
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+\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
+ \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
++            (if reverse\r
++                (concat (if (= (string-to-char s) ?-) "+" "-")\r
++                        (substring s 1))\r
++              s)))\r
++        tags))\r
++\r
++\r
+ ;;\r
+ \r
+ (provide 'notmuch-tag)\r
+-- \r
+1.7.9.5\r
+\r