Re: tree-sitter: conceptional problem solvable at Emacs' level?

[Eli Zaretskii]

> From: Konstantin Kharlamov <hi-angel@yandex.ru>
> Cc: Holger Schurig <holgerschurig@gmail.com>
> Date: Sat, 11 Feb 2023 10:11:24 +0300
> 
> On Sat, 2023-02-11 at 07:51 +0100, Theodor Thornhill wrote:
> > 
> > 
> > On 11 February 2023 07:36:26 CET, Konstantin Kharlamov <hi-angel@yandex.ru>
> > wrote:
> > > On Sat, 2023-02-11 at 09:25 +0300, Konstantin Kharlamov wrote:
> > > > On Sat, 2023-02-11 at 10:17 +0800, Po Lu wrote:
> > > > > Eli Zaretskii <eliz@gnu.org> writes:
> > > > > 
> > > > > > However, I meant the IDEs which are using tree-sitter and support
> > > > > > developing C/C++ programs.  I believe some do.
> > > > > 
> > > > > I think most of those have similar problems supporting macros.
> > > > > Who knows their names? I may be able to ask some of their users.
> > > > 
> > > > From my experience on and off work, there are just two IDEs (as in, not
> > > > editors)
> > > > used most widely for C++ code: QtCreator and Visual Studio. The first 
> > > > you
> > > > discussed, the second is proprietary.
> > > > 
> > > > Then again, people most often code in C++ and C with text editors, in 
> > > > that
> > > > case
> > > > popular choices from my experience: Sublime Text and VS Code. These two
> > > > have
> > > > don't use tree-sitter either.
> > > 
> > > I installed Sublime Text on my Archlinux and tested with the C++ code OP
> > > posted.
> > > 
> > > What I see is that ST does seem confused about indentation, while trying 
> > > to
> > > make
> > > a newline right after `slots:` line.
> > > 
> > > However, if you try to make a newline after the `void someSlot() {};` 
> > > line,
> > > it
> > > will use the indentation used on the previous line.
> > > 
> > > The default cc-mode in Emacs works similarly. The cc-ts-mode on the other
> > > hand
> > > doesn't make use of the previous indentation, and I think it should. It
> > > would
> > > resolve that problem and others, because in my experience it happens very
> > > often
> > > in C and C++ code that you want some custom indentation level, so you just
> > > make
> > > one and you expect the editor to keep it while creating more new lines.
> > > 
> > 
> > That last statement sounds easily solvable. Can you send me a short example
> > describing exactly what you want in a code snippet and I'll add it.
> > 
> > Thanks,
> > Theo
> 
> Thank you! The example is below, but please wait a bit just to make sure 
> there's no opposition from other people, because I don't know if it works 
> like this on purpose, or not.

Since we are close to a pretest, I think we should have a defcustom
which controls this behavior, and leave to users whether to turn this
on or off.