modifying/deleting ovelrays; also, un-sparsifying tree?

modifying/deleting ovelrays; also, un-sparsifying tree?

[Matt Price]

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In my gradesheets I use overlays to display the grade property in headlines
-- that way I can see at a glance approximately how my students are doing:

;; still imperfect, but good enough for me.
(defun org-grading-overlay-headings ()
  "Show grades at end of headlines that have a 'GRADE' property."
  (interactive)
  (require 'ov)

  (org-map-entries
   (lambda ()
     (when (org-entry-get (point) "GRADE")
       (ov-clear (- (line-end-position) 1)
                 (+ 0 (line-end-position)))
       (setq ov (make-overlay (- (line-end-position) 1)
                              (+ 0 (line-end-position))))
       (setq character (buffer-substring (- (line-end-position) 1)
(line-end-position)))
       (overlay-put
        ov 'display
        (format  "%s  GRADE: %s CHITS: %s" character (org-entry-get (point)
"GRADE") (org-entry-get (point) "CHITS")))
       (overlay-put ov 'name "grading")
       (message "%s" (overlay-get ov "name")))))
  )

This mostly works, except that I've noticed that, when I regenerate the
overlays after changes, certain folded trees end up with a duplicate
overlay, for reasons that I don't quite understand (maybe because the
ellipses at the end of the fold interfere with my counting somehow)?
I ould like to be able to find the named overlays and remove them all at
once, something like this:

(defun matt-clear-overlay ()
  (interactive)
  (let ((all-overlays (overlays-in (point-min) (point-max))))
    (dolist (x all-overlays)
      (if (string= (overlay-get x "name") "grading")
          (delete-overlay x)
          )))) ;; sorry for hanging brackets, I know it's bad form

this doesn't seem to do anything, so maybe I'm not testing right, or I'm
misnderstanding overlays. In any case ,I would love to be able to locate
the overlays properly, and modify or delete-and-recreate them
appropriately. Can you guys help out? Just clearing all overlays is not a
good option, as org seems to make heavy use of them to hide e.g. property
drawers.

An unrelated simple question: if I make a sparse tree (e.g. by searching
for all subtrees with a "GRADE" property of "0" or "FAIL",), can i
un-sparsify hte buffer afterwards? I didn't immediately find that option in
the manual.

thanks everyone!
matt

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Re: modifying/deleting ovelrays; also, un-sparsifying tree?

[Nicolas Goaziou]

Matt Price <moptop99@gmail.com> writes:

> In my gradesheets I use overlays to display the grade property in headlines
> -- that way I can see at a glance approximately how my students are doing:
>
> ;; still imperfect, but good enough for me.
> (defun org-grading-overlay-headings ()

Why don't you use column view instead?

> An unrelated simple question: if I make a sparse tree (e.g. by searching
> for all subtrees with a "GRADE" property of "0" or "FAIL",), can i
> un-sparsify hte buffer afterwards? I didn't immediately find that option in
> the manual.

See `org-reveal' or `org-cycle'.

Regards,

-- 
Nicolas Goaziou

Re: modifying/deleting ovelrays; also, un-sparsifying tree?

[Matt Price]

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On Fri, Jul 29, 2016 at 10:46 AM, Nicolas Goaziou <mail@nicolasgoaziou.fr>
wrote:

> Matt Price <moptop99@gmail.com> writes:
>
> > In my gradesheets I use overlays to display the grade property in
> headlines
> > -- that way I can see at a glance approximately how my students are
> doing:
> >
> > ;; still imperfect, but good enough for me.
> > (defun org-grading-overlay-headings ()
>
> Why don't you use column view instead?
>

um.  because...  um.... I guess I had some reason a year ago when I
designed this system. Looking at it again today, column view looks great...

>
> > An unrelated simple question: if I make a sparse tree (e.g. by searching
> > for all subtrees with a "GRADE" property of "0" or "FAIL",), can i
> > un-sparsify hte buffer afterwards? I didn't immediately find that option
> in
> > the manual.
>
> See `org-reveal' or `org-cycle'.
>
org-reveal is what I'm looking for, thank you!

>
> Regards,
>
> --
> Nicolas Goaziou
>

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Re: modifying/deleting ovelrays; also, un-sparsifying tree?

[Matt Price]

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On Fri, Jul 29, 2016 at 11:31 AM, Matt Price <moptop99@gmail.com> wrote:

>
>
> On Fri, Jul 29, 2016 at 10:46 AM, Nicolas Goaziou <mail@nicolasgoaziou.fr>
> wrote:
>
>> Matt Price <moptop99@gmail.com> writes:
>>
>> > In my gradesheets I use overlays to display the grade property in
>> headlines
>> > -- that way I can see at a glance approximately how my students are
>> doing:
>> >
>> > ;; still imperfect, but good enough for me.
>> > (defun org-grading-overlay-headings ()
>>
>> Why don't you use column view instead?
>>
>
> um.  because...  um.... I guess I had some reason a year ago when I
> designed this system. Looking at it again today, column view looks great...
>

small question: Is it possible to get one or more columns to always line up
o nthe right hand side of the buffer? Or to assign a width to the first
column (in my case the item name) that is somehting like "buffer-width
minus 30"?



>
>

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Re: modifying/deleting ovelrays; also, un-sparsifying tree?

[Nicolas Goaziou]

Matt Price <moptop99@gmail.com> writes:

> small question: Is it possible to get one or more columns to always line up
> o nthe right hand side of the buffer? Or to assign a width to the first
> column (in my case the item name) that is somehting like "buffer-width
> minus 30"?

No, it isn't.

Regards,