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Re: [PATCH] lisp/ob-scheme.el

From: Ihor Radchenko
Subject: Re: [PATCH] lisp/ob-scheme.el
Date: Sun, 26 Mar 2023 09:32:19 +0000

Zelphir Kaltstahl <zelphirkaltstahl@posteo.de> writes:

>>> +  "Expand :var header arguments given as VARS."
>>> +  (mapconcat
>>> +   (lambda (var)
>>> +     (format "(define %s %S)" (car var) (cdr var)))
>> Is there any reason why you use %s for variable name? Previously it was
>> formatted with escapes (using %S).
> That was me thinking: "The name of the variable should just be itself, not 
> wrapped in double quotes, because in Scheme I cannot create a variable as 
> (define "abc" 123)". But maybe I misunderstood %s and %S. I also do not know, 
> how elisp's `print' treats its arguments. Will use 2 times %S then.

The main difference between %S and %s can be demonstrated using the

(insert (format "%s" 'symbol\#w\ spaces))
(insert (format "%S" 'symbol\#w\ spaces))

Basically, if symbol name contains funny chars, reader may need to have
them escaped. %S does the escaping, while %s does not.

Of course, %S escapes according to Elisp reader, not Scheme.
I am not sure if Scheme syntax allows escapes in symbol names.
If not, there should be no real difference.

Also, `print' is the same as %S.

>> Also, previous version quoted the variable value with "'". Why didn't
>> you do it here?
> I am not sure I understand what you are referring to in the previous version. 
> Do 
> you mean that `print' quoted variable values with a single quote? Do you mean 
> this part of the previous code:
> (print `(,(car var) ',(cdr var)))
> ?

Yes, but upon closer look, it should not matter. Your code will work
just fine.

>>> +         (concat (org-babel-expand-header-arg-vars:scheme vars) body))
>> `mapconcat' you used in `org-babel-expand-header-arg-vars:scheme' does
>> not add trailing newline, unlike done previously.

> Am I not adding a newline? I think I do?:

I meant after variable definitions.
You have
   (concat (org-babel-scheme-expand-header-arg-vars vars) body)
but string returned by `org-babel-scheme-expand-header-arg-vars' will
not have final newline after the very last define.

> I have a question or suggestion:
> When I save the file in Emacs, my Emacs turns all the tabs in there into 
> spaces. 
> Probably my own custom global config's choice about indentation. Could a 
> general 
> mode line thing be added to avoid that and nail down the current formatting 
> style, so that contributors only need to allow Emacs to run those settings 
> and 
> then not need to care about it? Currently the indentation style seems to be a 
> mix of tabs and spaces.

This is something about your setup overriding Org mode project defaults.
If you open org-mode/.dir-locals.el, you will see that we enable
indent-tabs-mode. If you still do not get it enabled, you probably
set indentation defaults aggressively it in your config via hooks or
something similar.

> And one more question:
> Does the name of the patch file matter? Git changed the name and I will 
> attach 
> it as it was created by git. Hope that's alright.

Patch file name does not matter.

Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>

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