[PATCH v2 1/6] emacs: add helper for tag change list manipulation
Jani Nikula
jani at nikula.org
Thu Sep 6 08:32:37 PDT 2012
Add a helper to create (and optionally reverse) a list of tag changes.
---
emacs/notmuch-tag.el | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el
index 0c0fc87..4fce3a9 100644
--- a/emacs/notmuch-tag.el
+++ b/emacs/notmuch-tag.el
@@ -140,6 +140,21 @@ notmuch-after-tag-hook will be run."
;; in all cases we return tag-changes as a list
tag-changes)
+(defun notmuch-tag-change-list (tags &optional reverse)
+ "Convert TAGS into a list of tag changes.
+
+Add a \"+\" prefix to any tag in TAGS list that doesn't already
+begin with a \"+\" or a \"-\". If REVERSE is non-nil, replace all
+\"+\" prefixes with \"-\" and vice versa in the result."
+ (mapcar (lambda (str)
+ (let ((s (if (string-match "^[+-]" str) str (concat "+" str))))
+ (if reverse
+ (concat (if (= (string-to-char s) ?-) "+" "-")
+ (substring s 1))
+ s)))
+ tags))
+
+
;;
(provide 'notmuch-tag)
--
1.7.9.5
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