bug#74833: 31.0.50; Copy to OS clipboard doesn't work in macOS Terminal.app with xterm-mouse-mode enabled

[Jared Finder]

On 2024-12-27 00:02, Eli Zaretskii wrote:
> > Date: Thu, 26 Dec 2024 15:51:14 -0800
> > From: Jared Finder <jared@finder.org>
> > Cc: Eli Zaretskii <eliz@gnu.org>, rms@gnu.org, 
> > gerd.moellmann@gmail.com,
> >  fgunbin@fastmail.fm, 74833@debbugs.gnu.org
> >
> > On 2024-12-23 11:43, Ship Mints wrote:
> > > On Mon, Dec 23, 2024 at 4:07 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > >>> From: Ship Mints <shipmints@gmail.com>
> > >>>
> > >>> Away from a computer, but I think this is still the same in 0.82
> > >>> these days and I assume you're using modern
> > >>> ssh.
> > >>>
> > >>> https://serverfault.com/a/819740
> > >>
> > >> OK, so does this mean we want to tell PuTTY users to configure this in
> > >> some specific way that Emacs can recognize?
> > >
> > > Still away from a computer. If you can set a variable using that method
> > > and have it pass through for you to test in lisp, then it would be a
> > > good idea to recommend. We could suggest using TERM_PROGRAM and setting
> > > it to "Putty".
> >
> > What if we only auto-enabled xterm-mouse-mode on OSC52 compatible
> > terminals?
>
> On OSC52 compatible terminals, or on OSC52 compatible terminals that
> define TERM to xterm-like string?  The latter sounds like a good idea
> to me, but only if support for OSC52 necessarily means xterm-mouse
> escape sequences must be supported.  Is this conjecture indeed true?

I'm proposing Emacs have a manually curated allow list for now for 
auto-enabling xterm-mouse-mode. Being OSC52 compatible gets us the copy 
/ paste issue this bug mentioned. We can add other conditions going 
forward.

> > Between $TERM and the results from the terminal escape
> > sequence "ESC [ > 0 q", Emacs can have high confidence if it is 
> > running
> > on an OSC52 compatible terminal. I checked against most of the 
> > terminals
> > mentioned at
> > https://can-i-use-terminal.github.io/features/osc52copy.html I just
> > wasn't able to test Foot (Wayland-only), hterm (Chromebook-only), 
> > mintty
> > (Cygwin-only), or xterm.js (I have no idea how to test).
>
> How do I check this? can you show some script or Lisp or whatever you
> used to check?

Run the following lisp code in Emacs:

(progn
  (send-string-to-terminal "\e[>0q")
  (let ((str "")
        chr)
    (while (setq chr (xterm--read-event-for-query))
      (setq str (concat str (string chr))))
    str))

You should get the string "\eP>|terminal name and version\e\\". For 
example, under iTerm2 I get iTerm2 3.5.10 as the terminal name and 
version and under Kitty I get kitty(0.38.1).

  -- MJF