[RFC PATCH 3/4] emacs: add notmuch hello refresh hook to display message count change

[Dmitry Kurochkin]

Jani Nikula <jani at nikula.org> writes:

> Add a notmuch hello refresh hook to display a message about change in
> message count in the database since the notmuch-hello buffer was last
> refreshed manually (no-display is nil).

I like this idea.  But IMO we should avoid another call to notmuch
count.  Notmuch-hello buffer already displays the message count on the
first line.  I would propose to implement this functionality not as a
hook but as part of the section which outputs the first line.  We can
add an option to disable it if you prefer but I do not think it is
needed.  This is less flexible than a hook, but IMO it is not a big
issue.

Regards,
  Dmitry

> ---
>  emacs/notmuch-hello.el |   23 +++++++++++++++++++++++
>  1 files changed, 23 insertions(+), 0 deletions(-)
>
> diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el
> index 0596bbe..13da146 100644
> --- a/emacs/notmuch-hello.el
> +++ b/emacs/notmuch-hello.el
> @@ -148,6 +148,7 @@ International Bureau of Weights and Measures."
>  (defcustom notmuch-hello-refresh-hook nil
>    "Functions called after updating a `notmuch-hello' buffer."
>    :type 'hook
> +  :options '(notmuch-hello-refresh-status-message)
>    :group 'notmuch-hello
>    :group 'notmuch-hooks)
>  
> @@ -729,6 +730,28 @@ following:
>      (let ((fill-column (- (window-width) notmuch-hello-indent)))
>        (center-region start (point)))))
>  
> +(defvar notmuch-hello-refresh-count 0
> +  "Number of messages in the database when `notmuch-hello' was last run.
> +
> +Used internally by `notmuch-hello-refresh-status-message'.")
> +
> +(defun notmuch-hello-refresh-status-message (no-display)
> +  "Hook to display a status message when refreshing notmuch-hello buffer."
> +  (unless no-display
> +    (let* ((new-count
> +	    (string-to-number (car (process-lines notmuch-command "count"))))
> +	   (diff-count (- new-count notmuch-hello-refresh-count)))
> +      (if (= notmuch-hello-refresh-count 0)
> +	  (message "You have %s messages."
> +		   (notmuch-hello-nice-number new-count))
> +	(if (not (= diff-count 0))
> +	    (if (>= diff-count 0)
> +		(message "You have %s more messages since last refresh."
> +			 (notmuch-hello-nice-number diff-count))
> +	      (message "You have %s fewer messages since last refresh."
> +		       (notmuch-hello-nice-number (- diff-count))))))
> +      (setq notmuch-hello-refresh-count new-count))))
> +
>  ;;;###autoload
>  (defun notmuch-hello (&optional no-display)
>    "Run notmuch and display saved searches, known tags, etc."
> -- 
> 1.7.1
>
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