If the '--socket-name' argument is unspecified, the environment
variable 'EMACS_SOCKET_NAME' is now consulted with the same
semantics. This mirrors the behavior of the '--server-file' argument,
and allows for easier configuration of emacsclient when the socket is
in a location other than 'TMPDIR' or '/tmp'.
* emacsclient.c (set_socket): Add support for the
EMACS_SOCKET_NAME environment variable. (Bug#33095)
* misc.texi (emacsclient Options):
* emacsclient.1: Document the EMACS_SOCKET_NAME environment
variable.
* etc/NEWS: Announce the new feature.
Copyright-paperwork-exempt: yes
* lib-src/emacsclient.c (fail): Parse ALTERNATE_EDITOR, or
corresponding command-line argument, into quote- or space-separated
tokens. If a token starts with a quote, then it naturally is expected
to end with a quote; escaping is not supported. This is enough to cope
with the typical case of requiring the initial path to be quoted,
common on Windows where it may contain spaces.
* etc/NEWS: Document.
* doc/emacs/misc.texi: Likewise.
* doc/man/emacsclient.1: Tweak to remove the implication that only an
editor can be specified (the manual already mentions a “command”).
Fix a small error where “EDITOR” is referred to rather than
“ALTERNATE_EDITOR”.
* test/lib-src/emacsclient-tests.el: Add tests.
* doc/emacs/misc.texi (emacsclient Options): Document how emacsclient
runs the Emacs daemon.
* doc/man/emacsclient.1: Document how -a "" starts the daemon.
Fixes: debbugs:9674
argument does for --alternate-editor.
* emacsclient.1: Describe what an empty string argument does for
--alternate-editor.
* emacsclient.c (print_help_and_exit): Describe what an empty
string argument does for --alternate-editor.
(set_socket): Make it possible to not exit in case of an error.
(start_daemon_and_retry_set_socket): New function.
(main): Use it. Restore the NULL value for socket_name and
server_file after the set_socket call.
