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Re: [Emacs-orgmode] Re: Org-mode 'organized' visibility


From: Eddward DeVilla
Subject: Re: [Emacs-orgmode] Re: Org-mode 'organized' visibility
Date: Thu, 24 Aug 2006 15:17:32 -0500

I don't know if I'm following or not.  I think I get the grouping you
are after.  If trailing blank line are empty it does not collapse into
the text for a heading.  If it is blank, but contains white space
character, it does collapse.

So I am able to do the following

   ------
   * heading
     I have something to say
   <space or tab>
   *heading 2
     I have more to say

   * unrelated heading
     Now for something completely different

   ------

And this will collapse down to

   ------
   * heading
   * heading 2

   * unrelated heading

   ------

Along these lines, I used to wish for something like a horizontal line
that I could throw in between 'sections'.  For the moment, I have a
layout style that looks fine without it and without playing too many
games with trailing blank (but not empty) lines.

On 8/24/06, Carsten Dominik <address@hidden> wrote:
Hi Caspar,

On Aug 23, 2006, at 15:13, Casper Gripenberg wrote:

> Hi..is it possible to not make S-TAB collapse
> empty spaces between items. If I have a long
> list of items I like to organize them into
> groups..and then when I collapse the whole
> tree I'd like my groupings it to be visible like this:
>
> * Tasks...
>
> * Something important...
> * Something related to above...
>
> * Something else not related...
> * Again related...
> * Related...
>
> * Not related...
>
> Instead of the current way:
>
> * Tasks...
> * Something important...
> * Something related to above...
> * Something else not related...
> * Again related...
> * Related...
> * Not related...
>
> ..which doesn't allow me to see the groupings
> between the tasks I have. I just think grouping provides
> much quicker visual feedback of the tasks/headlines and
> their relations to each other.
>
> To implement the groupings you might have a rule that
> more than two empty lines between two headings will
> then activate 'grouping'.
>
> So if I have:
>
> * Important
>
>   Blah blah
>
> * Related
>
>   Blah blah
>
>
> * Not related
>
> This would collapse into:
>
> * Important...
> * Related...
>
> * Not related...
>
> Or something along those lines..is that possible to
> do somehow?
>
> Thanks..
>
> Regards,
>   Casper

This is something outside the direct control of Org-mode, it is
entirely done by outline-mode.  Looking at outline.el, I see two
possibilities to address this:

1.  For this first one, you need a current version of Emacs (must be
CVS, Emacs 21 does not have this).  Outline has an undocumented feature
which makes it possible to relate an empty line before a heading to the
heading.  So when the heading is shown, the empty line is shows along
with it.  Similarly, a subtree is then defined to be before that empty
line.  As I said, this is an undocumented feature in so far as the
corresponding variable is not customizable.  However, you can still set
it in the old way using

     (setq outline-blank-line t)

If you do it in this way, there will be no difference between a single
or a double empty line.  An empty line before a heading will create an
empty line in the CONTENT and CHILDREN views of org-cycle.

2. If we insist on your convention on using two line to mark a
separation (we should, because it is the better convention), you would
have to redefine a function in outline.  This is not clean, but who
gives a s*** :-)  And I like this convention better, because I very
often want to have an empty line above a headline without it meaning a
separation.

The function to modify is outline-show-heading, and it must be modified
after outline.el has been loaded.  If you are only using outline in
connection with Org-mode, here is a way to do this:

(add-hook 'org-load-hook
          (lambda ()
            (defun outline-show-heading ()
              "Show the current heading and move to its end."
              (outline-flag-region
               (- (point)
                  (cond
                   ((bobp) 0)
                   ((equal (buffer-substring
                            (max (point-min) (- (point) 3))  (point))
                           "\n\n\n")
                    2)
                   (t 1)))
               (progn (outline-end-of-heading) (point))
               nil))))

If you want this for other uses of outline as well, you could use
`eval-after-load' or defadvice to achieve this change.

There is a small possibility that doing either of these things might
break something else in org-mode.  I don't think so, but maybe I am not
overseeing it fully.  If you see something strange, let me know.

Hope this helps.

- Carsten



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