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

[Jani Nikula]

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

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