From the commit message:

    emacs: add notmuch-before- and notmuch-after-tag-hook
    
    This patch adds hooks that are run before/after messages are tagged
    from the emacs interface.  In order to implement this and to avoid
    having hooks parse all the arguments to the notmuch binary again, I
    created a `notmuch-tag' function that other modules should use instead
    of running (notmuch-call-notmuch-process "tag" ...) directly.

I wasn't sure about adding the notmuch-tag function, but I think it is a
bit cleaner than calling notmuch-call-notmuch-process directly in so
many places anyway.

Of course, any comments or criticism is appreciated.

-- Daniel
From 1acc99736a84e5294ba44368690dd79001e2e347 Mon Sep 17 00:00:00 2001
From: Daniel Schoepe <daniel.scho...@googlemail.com>
Date: Sun, 15 May 2011 17:48:58 +0200
Subject: [PATCH] emacs: add notmuch-before- and notmuch-after-tag-hook

This patch adds hooks that are run before/after messages are tagged
From the emacs interface.  In order to implement this and to avoid
having hooks parse all the arguments to the notmuch binary again, I
created a `notmuch-tag' function that other modules should use instead
of running (notmuch-call-notmuch-process "tag" ...) directly.
---
 emacs/notmuch-message.el |    3 +--
 emacs/notmuch-show.el    |   12 ++++--------
 emacs/notmuch.el         |   45 +++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 46 insertions(+), 14 deletions(-)

diff --git a/emacs/notmuch-message.el b/emacs/notmuch-message.el
index d5c96c2..aefd3fb 100644
--- a/emacs/notmuch-message.el
+++ b/emacs/notmuch-message.el
@@ -44,8 +44,7 @@ the \"inbox\" and \"todo\", you would set
 				 (concat "+" str)
 			       str))
 			  notmuch-message-replied-tags)))
-	(apply 'notmuch-call-notmuch-process "tag"
-	       (append tags (list (concat "id:" (car (car rep)))) nil))))))
+	(apply 'notmuch-tag (concat "id:" (car (car rep))) tags)))))
 
 (add-hook 'message-send-hook 'notmuch-message-mark-replied)
 
diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 825988c..2b905c8 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1273,10 +1273,8 @@ the result."
 	 (new-tags (notmuch-show-add-tags-worker current-tags toadd)))
 
     (unless (equal current-tags new-tags)
-      (apply 'notmuch-call-notmuch-process
-	     (append (cons "tag"
-			   (mapcar (lambda (s) (concat "+" s)) toadd))
-		     (cons (notmuch-show-get-message-id) nil)))
+      (apply 'notmuch-tag (notmuch-show-get-message-id)
+	     (mapcar (lambda (s) (concat "+" s)) toadd))
       (notmuch-show-set-tags new-tags))))
 
 (defun notmuch-show-remove-tag (&rest toremove)
@@ -1289,10 +1287,8 @@ the result."
 	 (new-tags (notmuch-show-del-tags-worker current-tags toremove)))
 
     (unless (equal current-tags new-tags)
-      (apply 'notmuch-call-notmuch-process
-	     (append (cons "tag"
-			   (mapcar (lambda (s) (concat "-" s)) toremove))
-		     (cons (notmuch-show-get-message-id) nil)))
+      (apply 'notmuch-tag (notmuch-show-get-message-id)
+	     (mapcar (lambda (s) (concat "-" s)) toremove))
       (notmuch-show-set-tags new-tags))))
 
 (defun notmuch-show-toggle-headers ()
diff --git a/emacs/notmuch.el b/emacs/notmuch.el
index 1d683f8..837136d 100644
--- a/emacs/notmuch.el
+++ b/emacs/notmuch.el
@@ -465,6 +465,44 @@ and will also appear in a buffer named \"*Notmuch errors*\"."
 	    (error (buffer-substring beg end))
 	    ))))))
 
+(defun notmuch-tag (query &rest tags)
+  "Add/remove tags in TAGS to messages matching QUERY.
+
+TAGS should be a list of strings of the form \"+TAG\" or \"-TAG\" and
+QUERY should be a string containing the search-query.
+
+Note: Other code should always use this function alter tags of
+messages instead of running (notmuch-call-notmuch-process \"tag\" ..)
+directly, so that hooks specified in notmuch-before-tag-hook and
+notmuch-after-tag-hook will be run."
+  (run-hooks 'notmuch-before-tag-hook)
+  (apply 'notmuch-call-notmuch-process
+	 (append (list "tag") tags (list "--" query)))
+  (run-hooks 'notmuch-after-tag-hook))
+
+(defcustom notmuch-before-tag-hook nil
+  "Hooks that are run before tags of a message are modified.
+
+'tags' will contain the tags that are about to be added or removed as
+a list of strings of the form \"+TAG\" or \"-TAG\".
+'query' will be a string containing the search query that determines
+the messages that are about to be tagged"
+
+  :type 'hook
+  :options '(hl-line-mode)
+  :group 'notmuch)
+
+(defcustom notmuch-after-tag-hook nil
+  "Hooks that are run before tags of a message are modified.
+
+'tags' will contain the tags that were added or removed as
+a list of strings of the form \"+TAG\" or \"-TAG\".
+'query' will be a string containing the search query that determines
+the messages that were tagged"
+  :type 'hook
+  :options '(hl-line-mode)
+  :group 'notmuch)
+
 (defun notmuch-search-set-tags (tags)
   (save-excursion
     (end-of-line)
@@ -504,7 +542,7 @@ and will also appear in a buffer named \"*Notmuch errors*\"."
 
 (defun notmuch-search-add-tag-region (tag beg end)
   (let ((search-id-string (mapconcat 'identity (notmuch-search-find-thread-id-region beg end) " or ")))
-    (notmuch-call-notmuch-process "tag" (concat "+" tag) search-id-string)
+    (notmuch-tag search-id-string (concat "+" tag))
     (save-excursion
       (let ((last-line (line-number-at-pos end))
 	    (max-line (- (line-number-at-pos (point-max)) 2)))
@@ -518,7 +556,7 @@ and will also appear in a buffer named \"*Notmuch errors*\"."
 
 (defun notmuch-search-remove-tag-region (tag beg end)
   (let ((search-id-string (mapconcat 'identity (notmuch-search-find-thread-id-region beg end) " or ")))
-    (notmuch-call-notmuch-process "tag" (concat "-" tag) search-id-string)
+    (notmuch-tag search-id-string (concat "-" tag))
     (save-excursion
       (let ((last-line (line-number-at-pos end))
 	    (max-line (- (line-number-at-pos (point-max)) 2)))
@@ -815,8 +853,7 @@ characters as well as `_.+-'.
 	(unless (string-match-p "^[-+][-+_.[:word:]]+$" (car words))
 	  (error "Action must be of the form `+thistag -that_tag'"))
 	(setq words (cdr words))))
-    (apply 'notmuch-call-notmuch-process "tag"
-	   (append action-split (list notmuch-search-query-string) nil))))
+    (apply 'notmuch-tag notmuch-search-query-string action-split)))
 
 (defun notmuch-search-buffer-title (query)
   "Returns the title for a buffer with notmuch search results."
-- 
1.7.5.1

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