Re: [PATCH 2/2] Allow check-mark to be changed for CLI

[Eli Zaretskii <eliz@gnu.org>]

> From: Tom Tromey <tromey@adacore.com>
> Cc: Tom Tromey <tromey@adacore.com>,  gdb-patches@sourceware.org
> Date: Fri, 16 May 2025 08:20:03 -0600
> 
> >>>>> "Andrew" == Andrew Burgess <aburgess@redhat.com> writes:
> 
> Andrew> Tom Tromey <tromey@adacore.com> writes:
> >> In keeping with the emojification of gdb, this patch changes the
> >> default "current" marker to be a check-mark.  It adds a knob to allow
> >> the character to be changed, and, as always, reverts to the old output
> >> when emojis are disabled.
> 
> Andrew> I haven't tested this patch just yet (short of time), but I wonder if I
> Andrew> set the check-mark character to a multi-character string, does that
> Andrew> corrupt the output?  I'm guessing so as I don't think table columns
> Andrew> auto-adjust.
> 
> Andrew> So my real question: at a minimum, should the docs mention that the
> Andrew> STRING should only be a single character.  And better yet, can we check
> Andrew> that the string is only a single character in width somewhere?
> 
> Yeah, I will update the docs in v2.
> 
> I don't think there's any way to figure out what the display width of a
> string might be.  At least, not unless gdb adds a dependency on
> something like libicu.

I don't think even libicu will be enough, because the terminal
emulators vary in this respect.

There's some recent protocol to help with this, but I don't think it's
supported widely enough for GDB to rely on it.