bug#25708: 25.1.91; Allow users to inhibit printing for 'emacsclient -c -t'

[Peder O. Klingenberg]

Alex Hutcheson <alexhutcheson@google.com> writes:

> It would be great if emacsclient had a way to inhibit printing the
> result, for cases where the user is only eval'ing the expressions for
> their side effects.

Emacsclient claims to have that functionality already.  From the
usage-message:

-q, --quiet             Don't display messages on success

This should, in my opinion, cover the case of successfully eval-ing
forms.  However, -q currently has no effect on output from emacs, it
only inhibits messages about connecting to emacs.

The attached patch should prevent emacsclient from printing non-error
output from emacs to the terminal.

With this the terminal stays quiet after exiting the client frame when I
do "emacsclient -q -c -e '(+ 2 3)'".  Without the -q, the terminal
prints 5 as before.

0001-Extend-emacsclient-quiet-to-cover-eval-output.patch
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