[PATCH v2 1/6] emacs: add helper for tag change list manipulation

diff --git a/b1/3bc91b732aa025e8d211400b86c43655b55719 b/b1/3bc91b732aa025e8d211400b86c43655b55719
new file mode 100644 (file)
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+++ b/b1/3bc91b732aa025e8d211400b86c43655b55719
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+From: Jani Nikula <jani@nikula.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v2 1/6] emacs: add helper for tag change list manipulation\r
+Date: Thu,  6 Sep 2012 18:32:37 +0300\r
+Message-Id:\r
+ <507c09a1872c15b3febeb215542a81fc8dce6938.1346945257.git.jani@nikula.org>\r
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+Cc: Tomi Ollila <tomi.ollila@iki.fi>\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 |   15 +++++++++++++++\r
+ 1 file changed, 15 insertions(+)\r
+\r
+diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el\r
+index 0c0fc87..4fce3a9 100644\r
+--- a/emacs/notmuch-tag.el\r
++++ b/emacs/notmuch-tag.el\r
+@@ -140,6 +140,21 @@ 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 (string-match "^[+-]" str) str (concat "+" 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