bug#71856: 30.0.50; string-pad length vs width

bug#71856: 30.0.50; string-pad length vs width

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Package: Emacs
Version: 30.0.50


Is it just we or we should `s/length/width/` on the doc&code of
`string-pad`?  AFAIK counting codepoints rarely makes sense (unless
those code points have width==1, of course).

Same for `string-fill`.

I'd usually assume it was an oversight, but the doc keeps repeating
"length" enough times (and it's right next to `string-limit` which
insists it's about length).


        Stefan


 In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.38, cairo version 1.16.0) of 2024-06-25 built on pastel
Repository revision: 81a80256a2ce2718b1aedff315d147ba93be03d4
Repository branch: work
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)

Configured using:
 'configure -C --enable-checking --enable-check-lisp-object-type --with-modules --with-cairo --with-tiff=ifavailable
 'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign' --without-native-compilation
 PKG_CONFIG_PATH=/home/monnier/lib/pkgconfig'

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bug#71856: 30.0.50; string-pad length vs width

[Stefan Kangas]

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:

> Is it just we or we should `s/length/width/` on the doc&code of
> `string-pad`?  AFAIK counting codepoints rarely makes sense (unless
> those code points have width==1, of course).
>
> Same for `string-fill`.

I think that makes sense.

> I'd usually assume it was an oversight, but the doc keeps repeating
> "length" enough times (and it's right next to `string-limit` which
> insists it's about length).

Could this have been an oversight there also?

bug#71856: 30.0.50; string-pad length vs width

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

>> Is it just we or we should `s/length/width/` on the doc&code of
>> `string-pad`?  AFAIK counting codepoints rarely makes sense (unless
>> those code points have width==1, of course).
>> Same for `string-fill`.
> I think that makes sense.

Thanks.

>> I'd usually assume it was an oversight, but the doc keeps repeating
>> "length" enough times (and it's right next to `string-limit` which
>> insists it's about length).
>
> Could this have been an oversight there also?

No, this one is definitely done on purpose: for actual width, we already
have another function and `string-limit` explicitly refers to it.
[ Maybe the `coding-system` arg of `string-limit` should be mandatory,
  since it seems to be the most important use-case, tho.  ]


        Stefan

bug#71856: 30.0.50; string-pad length vs width

[Eli Zaretskii]

> Cc: monnier@iro.umontreal.ca
> Date: Sun, 30 Jun 2024 11:37:41 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Is it just we or we should `s/length/width/` on the doc&code of
> `string-pad`?  AFAIK counting codepoints rarely makes sense (unless
> those code points have width==1, of course).

Probably.  But the issue is not just with width==1, it is also with
character compositions.  Patches using string-width instead of length
are welcome.

There's another issue here: string-width ignores some of the
display-related issues, so we should consider whether we should use
string-width or string-pixel-width here (or maybe have optional
behavior, controlled by the caller, to use either one, as each one has
its advantages and disadvantages).

> Same for `string-fill`.

No, this one uses fill-region, which already handles the width of
characters.  So I've now fixed the doc string and renamed the argument
to WIDTH on the emacs-30 branch.