On Fri, Nov 04 2016, David Bremner <david@tethera.net> wrote:

> 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."
>  	  (progn
>  	    (push chosen notmuch-address-history)
>  	    (delete-region beg end)
> -	    (insert chosen))
> +	    (insert chosen)
> +	    (run-hook-with-args 'notmuch-address-completion-hook chosen))

Like someone (whose message I cannot find just now) mentioned in another
thread, just now it is right time to mention here too...

https://www.gnu.org/software/emacs/manual/html_node/elisp/Hooks.html

... that when hook name ends with `-hook` it is supposed to be "normal hook"
-- a function which does not take arguments nor return values.

So, I'd like to suggest that this variable is renamed to 
notmuch-address-completion-functions


Tomi


>  	(message "No matches.")
>  	(ding))))
>     (t nil)))