bug#68493: Got to be a better way to customize c-ts-mode indentation

Eli Zaretskii <[email protected]> writes:

>> From: Daniel Colascione <[email protected]>
>> Date: Mon, 15 Jan 2024 18:51:25 -0500
>> 
>> There's got to be a way to customize tree-sitter-based indentation
>> that's cleaner than the patching I'm doing below.
>
> Agreed.  Patches welcome.
>
>> Wouldn't it be nice if we could use cc-mode indentation rules with
>> c-ts-mode?
>
> It would, indeed.  Of course, it isn't easy: CC Mode's indentation
> rules are defined in terms of pseudo-syntactic parameters that don't
> map easily (to say the least) into what a parser returns, and many of
> the rules invoke CC Mode functions (as opposed to reference variables
> and literals) that are specific to CC Mode and its analysis of the C
> source.  Again, patches welcome.

Is the following description this bug? Or should I talk more about it in
some other or new report?

Its about indentation of concatanated strings like this (in a c-buffer)

char *lines =
  "line1\n"
  "line2\n"

The above is what I "get" with c-mode (in emacs -Q). If I switch over to
c-ts-mode and say C-x h and TAB, I get

char *lines =
  "line1\n"
    "line2\n"

Further literals will align with "line2\n". I would like it to be
aligned as with c-mode. Is there a setting for this?

This has been observed with

GNU Emacs 31.0.90 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.49, cairo version 1.18.4) of 2026-07-02