Re: emacs-29 b18754bb179: Minor improvements in c-ts-mode and docs

[Dmitry Gutov]

On 16/02/2023 17:19, Eli Zaretskii wrote:
> > Date: Thu, 16 Feb 2023 14:51:09 +0200
> > Cc: emacs-devel@gnu.org
> > From: Dmitry Gutov <dgutov@yandex.ru>
> >
> > > We could at least discuss that, sure.  Is there a list of
> > > inconsistencies between those modes available anywhere?
> >
> >   From past discussions and looking at 'C-h m':
> >
> > - "electric" behaviors: CC Mode's commands vs. electric-indent-mode and
> > electric-pair-mode.
> > - c-subword-mode vs subword-mode
> > - c-display-defun-name vs which-function-mode
> > - c-indent-exp vs prog-indent-sexp
> > - c-indent-defun/c-fill-paragraph vs prog-fill-reindent-defun
> > - c-indent-line-or-region vs indent-for-tab-command and indent-region.
>
> These don't exist in c-ts-mode, with the single exception of the
> electric behavior of '#' (which is a must in C).

Could it work by adding ?# to electric-indent-chars?

> So I think we are
> already there, no?

We are at a crossroads. I think. To the left lies the approach I 
described. To the right -- adding more stuff from CC Mode verbatim, 
simply because a lot of people are already used to it.

> > Curious how c-indent-line-or-region doesn't mind depending on
> > transient-mark-mode being on.
>
> It does:
>
>    (c-indent-line-or-region &optional ARG REGION)
>
>    Indent active region, current line, or block starting on this line.
>    In Transient Mark mode, when the region is active, reindent the region.
>    Otherwise, with a prefix argument, rigidly reindent the expression
>    starting on the current line.
>    Otherwise reindent just the current line.

Does the description mean that using the prefix will force a "rigid 
reindentation" of the region?

> > > The next question, of course, is how to go about reducing the
> > > inconsistencies.  What you proposed here is simply drop the
> > > keybinding,
> >
> > I also suggested, alternatively, that transient-mark-mode, when turned
> > off, creates a global binding for comment-region (also with 'C-c C-c').
>
> I'm not sure this is a good idea.  I'd rather we used the prefix
> argument to M-; in some creative way, like if its value is zero or
> negative.

Could be a decent option. The meaning of C-u is already taken (to kill 
the comment), but 'C-u C-u' could do something different. As long as 
users with t-m-m=off think 'C-u C-u M-;' is a bearable substitute to 
'C-c C-c'.