My Adventures in Scheme (Anyone for a laugh?)

jazzon · **Posted:** Sun Aug 23, 2015 3:15 am **(#1)**

My adventures in Scheme can be summed up easily :gaah

!

I Was perusing these forums and found several comments on the 'difficulty' of getting python plugins to work on windows. Having set up python on windows I would disagree, but I am probably more computer literate than most Windows users (no slight intended) (my main OS is Linux based and has been for 15+ years). But it got me thinking. Maybe I should be using scheme to write My plugins/scripts...

SOOoooo ... having long been dismayed at GIMP's lack of what I considered three essential commands I began.

Finding gimp specific resources was terrible. In the end I tore apart one of RobA's scripts, and used the most ancient tutorial I could find from GIMP. (It was the only one which addressed arrays, which I needed).

And now at long last ! After 4 hours of banging my head against this! I have discovered I HATE :hit

Scheme

! But none-the-less I successfully created the three essential commands which I found GIMP lacking!

(And during a final search for some information found they had been there all along, just not as menu items, so ever since gimp 1.something I have been missing the fact that I could simply shift-click on an eyeball to hide all of the layers, or un-hide all of the layers.) :cry

But at any rate, for those who like the options on a menu, here they are. The appear under Layer->Hide, and in the right click context menu of the layer dialogue. THey provide Hide All, Hide All But Active, and Hide None.

And now that I have killed four hours, I am tired and going to bed! :otb

ps
Yeah, I kinda like the smilies!

[EDIT: Had to recode a version for GIMP 2.6 for (I presume) the Mac users out there. It is confirmed working and attached here now.]

Issabella · **Posted:** Sun Aug 23, 2015 3:33 am **(#2)**

jazzon, poor thing! but I think one never wastes time searching, there is always something positive. I thank you and people like you who invest your time to get things easier to everybody.

I know that pressing shift and the eye of the layer they open or close all at once.

Thanks jazzon for sharing your experience. :bigthup

jazzon · **Posted:** Sun Aug 23, 2015 5:12 am **(#3)**

Issabella As long as I made some one chuckle it was all worth it!

In fact, since I'm learning this from the ground up, maybe I'll do a tutorial on it.... worth a thought. I'm good a how-tos and such.

Wallace · **Posted:** Sun Aug 23, 2015 5:49 am **(#4)**

Even though I'm aware of the shortcut keys you mentioned. I agree with Issabella, so thanks for taking the time to create the hide-all-layers script.

Steve · **Joined:** Dec 26, 2014 **Posts:** 198

Thanks for the heads up on shift-click, a great tip

but sorry the scm file doesn’t work for me, with gimp 2.6 I get an

Execution error for 'All':
Error: eval: unbound variable: gimp-item-set-visible

jazzon · **Posted:** Sun Aug 23, 2015 6:00 am **(#6)**

Gimp 2.6 didnt have gimp-item set-visible
2 minutes for an update

jazzon · **Posted:** Sun Aug 23, 2015 6:03 am **(#7)**

Original post updated with 2.6 version.

Steve · **Joined:** Dec 26, 2014 **Posts:** 198

jazzon wrote:

Gimp 2.6 didnt have gimp-item set-visible
2 minutes for an update

Thanks, will do, :oops:

have a laugh on me :hehe

jazzon · **Posted:** Sun Aug 23, 2015 6:21 am **(#9)**

WAIT A MINUTE! I JUST REALIZED....

Steve wrote:

Thanks for the heads up on shift-click, a great tip

<snip>

That means I'm NOT the only one who didn't know!! :yes

!!

jazzon · **Posted:** Sun Aug 23, 2015 6:27 am **(#10)**

Wallace: Thanks for the compliment. Actually it served two purposes now I think about it. I learned from it, and it is such a simple script that it can be a starting out point for others as it shows the four most basic things:
Variable assignment,
Looping,
defining a function,
and registering the script with GIMP.
(All right so it doesn't have conditionals...) :lol

Steve · **Joined:** Dec 26, 2014 **Posts:** 198

jazzon wrote:

Original post updated with 2.6 version.

Thankyou

I suppose the clue was in the error message :oops:

jazzon · **Posted:** Sun Aug 23, 2015 6:55 am **(#12)**

Actually it was! I knew about the other command having a 'deprecated' tag, and you showing me the error told me just how new the command I used was! Thanks for the education

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4734

Compare:

Code: Select all

(define (script-fu-hide-all-layers image)
  (let*
    (
      (ct (- (car (gimp-image-get-layers image) ) 1) )
      (lst (cdr (gimp-image-get-layers image) ) )
      (array (car lst))
     )
     
     
  (while (> ct -1)
    (gimp-item-set-visible (aref array ct) 0)
    (set! ct (- ct 1))
  )
  (gimp-displays-flush)
 )
)

to

Code: Select all

def hide_all_layers(image):
    for layer in image.layers:
        layer.visible=False
    gimp.displays_flush()

But of course, this is fairly academic once you know about shift-click.

jazzon · **Posted:** Sun Aug 23, 2015 7:07 am **(#14)**

LOL PYTHON! My favorite!

I was trying scheme just as a thought. Most of what I do is Python.

Actually, I am playing with one of yours right now...Slinky.

MarFisk · **Joined:** Feb 28, 2014 **Posts:** 138

jazzon wrote:

Wallace: Thanks for the compliment. Actually it served two purposes now I think about it. I learned from it, and it is such a simple script that it can be a starting out point for others as it shows the four most basic things:
Variable assignment,
Looping,
defining a function,
and registering the script with GIMP.
(All right so it doesn't have conditionals...) :lol

Thanks for the template

. I did find the shift-click, but I've been meaning to try my hand at a script. I don't program in python yet, so having something clear as a guide is always nice

.

Rod · **Joined:** May 16, 2010 **Posts:** 14709 **Location:** USA

I believe the script "Layer Groups" http://registry.gimp.org/node/16563 (old but still functional), has these functions

But it is always nice to see new script writers out there. SCM scripting can be very powerful.
My suggestion is to either ask someone here if the script has been written or check gimpscripts.com or the GIMP filter registry at http://.registry.gimp.org because chances are it has been written already. Good luck with Scheme!

jazzon · **Posted:** Mon Aug 24, 2015 8:18 am **(#17)**

Rod: Do you happen to know if Layer Groups works 'properly' with GIMP 2.8's new layer groups? I would hate to muck up one with the other.

And to answer your pressing question ... -c (If the perception of light is caused by photons hitting our eyes at a speed of c, then if they were moving away from our eyes at c [relative -c] they would have achieved the speed of dark!)

Graechan · **Posted:** Mon Aug 24, 2015 7:38 pm **(#18)**

Although I could not track down It's origin this may help

Attachment:

all-visible-or-all-invisible.scm [2.04 KiB]
Downloaded 81 times

Rod · **Joined:** May 16, 2010 **Posts:** 14709 **Location:** USA

Quote:

Do you happen to know if Layer Groups works 'properly' with GIMP 2.8's new layer groups? I would hate to muck up one with the other.

It seems to work fine. You just need to define the group FOLDER name in the dialog that pops up.

Off Topic-
Dark is not moving at all. It is always there and the light only hides it from our observation.

ofnuts · **Joined:** Oct 25, 2010 **Posts:** 4734

Rod wrote:

Dark is not moving at all. It is always there and the light only hides it from our observation.

Everyone knows that lightbulbs are just sucking dark. So dark must be moving.

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