Add :coding support to open-network-stream and open-gnutls-stream

* doc/lispref/processes.texi (Network): Describe :coding keyword support.

* doc/misc/emacs-gnutls.texi (Help For Developers): Describe :coding
keyword support.

* etc/NEWS: Announce change to open-network-stream and
open-gnutls-stream.

* lisp/net/gnutls.el (open-gnutls-stream): Add support for :coding, pass it
down to open-network-stream.

* lisp/net/network-stream.el (open-network-stream)
(network-stream-open-plain, network-stream-open-starttls): Add
support for :coding, pass it down to make-network-process.
(network-stream-open-shell): Add support-for :coding, use
set-process-coding-system to set it after process creation.

1 files changed, 9 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 1af368caa63..ef2697f4853 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -339,6 +339,15 @@ Emacs depended on the previous behavior; if you really want the
 process' coding-system to be nil, use 'set-process-coding-system'
 after the process has been created, or pass in ":coding '(nil nil)".
 
++++
+** 'open-network-stream' now accepts a :coding argument.
+This allows specifying the coding systems used by a network process
+for encoding and decoding without having to bind
+coding-system-for-{read,write} or call 'set-process-coding-system'.
+
++++
+** 'open-gnutls-stream' now also accepts a :coding argument.
+
 
 * Changes in Emacs 28.1 on Non-Free Operating Systems