This hook can be used to update the message based on the results of
address completion. For example using message-templ or gnus-alias to set
the From address based on the To address just completed.

The post-completion command is added to the notmuch-company backend to
ensure that the hook is also called company completion is started
without going through notmuch-address-expand-name. See the docstring of
`company-backends' for more information.

Updates from Mark's second review
 emacs/notmuch-address.el | 14 +++++++++++++-
 emacs/notmuch-company.el |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/emacs/notmuch-address.el b/emacs/notmuch-address.el
index b2e1fba..36c796f 100644
--- a/emacs/notmuch-address.el
+++ b/emacs/notmuch-address.el
@@ -98,6 +98,17 @@ to know how address selection is made by default."
   :group 'notmuch-send
   :group 'notmuch-external)
+(defcustom notmuch-address-completion-hook nil
+  "Functions called after completing address.
+The completed address is passed as an argument to each function.
+Note that this hook will be invoked for completion in headers
+matching `notmuch-address-completion-headers-regexp'.
+  :type 'hook
+  :group 'notmuch-address
+  :group 'notmuch-hooks)
 (defun notmuch-address-selection-function (prompt collection initial-input)
   "Call (`completing-read'
       PROMPT COLLECTION nil nil INITIAL-INPUT 'notmuch-address-history)"
@@ -206,7 +217,8 @@ external commands."
            (push chosen notmuch-address-history)
            (delete-region beg end)
-           (insert chosen))
+           (insert chosen)
+           (run-hook-with-args 'notmuch-address-completion-hook chosen))
        (message "No matches.")
    (t nil)))
diff --git a/emacs/notmuch-company.el b/emacs/notmuch-company.el
index 168315f..91c4804 100644
--- a/emacs/notmuch-company.el
+++ b/emacs/notmuch-company.el
@@ -86,6 +86,7 @@
       (match (if (string-match notmuch-company-last-prefix arg)
                 (match-end 0)
+      (post-completion (run-hook-with-args 'notmuch-address-completion-hook 
       (no-cache t))))

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