Re: Screenshots, frame shots straight from Emacs

[Leo Butler <leo.butler@umanitoba.ca>]

Tomas Hlavaty <tom@logand.com> writes:

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>
> Hi Leo,
>
> On Tue 20 Jul 2021 at 12:42, Leo Butler <leo.butler@umanitoba.ca> wrote:
>> Tomas Hlavaty <tom@logand.com> writes:
>>
>>> this one works with plain console emacs:
>>> https://logand.com/sw/emacs-framebuffer/file/emacs-framebuffer.el.html#l755
>>
>> Nice. I have not tried it yet, but I do notice that
>
> thanks for your feedback!
>
>> https://logand.com/sw/emacs-framebuffer/file/emacs-framebuffer.el.html#l28
>>
>> requires cl.
>>
>> Also, when byte-compiling the file, I ran into 3 warnings which are easy
>> to correct (see attached). I still haven't got it working, but I think
>> that is due to user error.
>
> What Emacs version are you using?

M-x emacs-version

GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.24,
cairo version 1.16.0) of 2021-03-27, modified by Debian

>
> In Emacs 27.2, I get 2 warnings:
>
> emacs-framebuffer.el:28:1:Warning: cl package required at runtime
>
> and
>
> In framebuffer-hh:mm:ss:
> emacs-framebuffer.el:666:38:Warning: reference to free variable ‘position’
>
> The first one does not break anything.
>
> The second one is a bug relevant only for viewing videos on the console
> from a chosen position.
>
> None of them break screenshot functionality.
>
> There is /dev/fb0 hardcoded so this might cause problems for some but I
> actually never experienced any other device.  It would be interesting to
> know, how to properly detect which device is actually used if there are
> more than one.
>
>> -(require 'cl)
>> +(require 'cl-lib)
>
> What is the difference?  Why is that needed?  Is it it backward
> compatible?  There have been changes to working with cl package for some
> time, has the dust settled yet?

I think cl was officially deprecated in v27, so if I start emacs as a
daemon and my .emacs tries to pull in cl, emacs freezes.

>
>> +(make-variable-buffer-local
>> + (defvar framebuffer-image-mode-current-page))
>> +
>>  (defun framebuffer-draw (x y w h sx sy sw sh file)
>>    (setq file (framebuffer-cache-remote file))
>>    (let ((format (framebuffer-file-format file)))
>> @@ -465,8 +468,6 @@
>>   (defvar framebuffer-image-mode-image-size))
>>  (make-variable-buffer-local
>>   (defvar framebuffer-image-mode-npages))
>> -(make-variable-buffer-local
>> - (defvar framebuffer-image-mode-current-page))
>
> I seems to be necessary to have these defined before use so I will
> probably move those to the beginning of the file.

Yes.

>
> I did not get a warning for this.  Did you get a warning?

Yes, I did.

>
>> -       (format "%d:%02d:%02d" (floor position 3600) (floor (- m s) 60) s)))))
>> +       (format "%d:%02d:%02d" (floor sec 3600) (floor (- m s) 60) s)))))
>
> Thanks, I'll fix this typo.

I'll try to get it working on my installation when I have time. It's
great to be able to do this sort of thing.

Leo