bug#51454: Progress bar in Org source blocks

[zimoun <zimon.toutoune@gmail.com>]

Hi,

On Sat, 30 Oct 2021 at 06:55, excalamus@tutanota.com wrote:
>> try the environment variable INSIDE_EMACS with turns off
>> some fancy shell things.
>>
> This is a good suggestion.  Maybe I'm misunderstanding how
> INSIDE_EMACS works. The docs say:

Thanks for the pointing the Emacs doc.  From my understanding, the
environment variable INSIDE_EMACS is used by Guix to turn on/off
hyperlink support.  It reads,

--8<---------------cut here---------------start------------->8---
(define* (supports-hyperlinks? #:optional (port (current-output-port)))
  "Return true if PORT is a terminal that supports hyperlink escapes."
  ;; Note that terminals are supposed to ignore OSC escapes they don't
  ;; understand (this is the case of xterm as of version 349, for instance.)
  ;; However, Emacs comint as of 26.3 does not ignore it and instead lets it
  ;; through, hence the 'INSIDE_EMACS' special case below.
  (and (isatty?* port)
       (not (getenv "INSIDE_EMACS"))))
--8<---------------cut here---------------end--------------->8---

> "Emacs sets the environment variable INSIDE_EMACS in thesubshell to
> ‘version,comint’, where version is the Emacs version (e.g., ‘24.1’).
> Programs can check this variableto determine whether they are running
> inside an Emacs subshell."

Indeed, Emacs sets automatically this variable.  That’s why it is used
by Guix. :-)


> I understand this to mean that INSIDE_EMACS *is* being set and that
> it's the guix command's responsibility to do something with it (if it
> wants to).

Yes.


> If instead I set INSIDE_EMACS to something falsey (e.g. 1) and run
> through things, I see the same result with color and control
> characters.

Thanks for reporting. I though tweaking that variable would be enough to
fix the odd behaviour you are seeing,

--8<---------------cut here---------------start------------->8---
: guix package: [1;35mwarning: [0mnothing to do
--8<---------------cut here---------------end--------------->8---

which are related to shell fancy “controllers”.  If you have not tried
yet, then NO_COLOR=1 should do the job.  Sorry to not have thought
before. :-)


Cheers,
simon