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

[Dmitry Kurochkin]

Jani Nikula <jani at nikula.org> writes:

> On Tue, 17 Apr 2012 13:13:15 +0400, Dmitry Kurochkin <dmitry.kurochkin at gmail.com> wrote:
>> 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.
>
> And what if someone has disabled the header section but would want the
> message?

Well, that is what I meant by "less flexible than a hook".

> Also, you'd have to pass no-display there too.

Sure, we can pass it to sections.

> IMHO one call to
> notmuch count is not a big issue, especially for an optional feature.
> And having it as a hook very nicely isolates the feature from everything
> else.
>

I think this feature should be enabled by default.

I guess you are right that it is not a big issue.  I still think we
would be better without it (and we still can isolate the feature), but I
would not object to having the extra call.

Regards,
  Dmitry

> Jani.
>
>
>> 
>> 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
>> >
>> > _______________________________________________
>> > notmuch mailing list
>> > notmuch at notmuchmail.org
>> > http://notmuchmail.org/mailman/listinfo/notmuch