Define ERC message-formatting templates with defvar

Define ERC message-formatting templates with defvar

* etc/ERC-NEWS: Mention convenience macro being preferred means of
defining message templates.  Mention renaming of `notify' formatting
templates.
* lisp/erc/erc-common.el (erc--define-catalog,
erc-define-message-format-catalog): New macro and internal variant to
replace `erc-define-catalog-entry'.  The internal variant allows us to
defer reindenting existing definitions until meaningfully edited.
* lisp/erc/erc-dcc.el (erc-message-english-dcc-chat-discarded,
erc-message-english-dcc-chat-ended,
erc-message-english-dcc-chat-no-request,
erc-message-english-dcc-chat-offered,
erc-message-english-dcc-chat-offer,
erc-message-english-dcc-chat-accept,
erc-message-english-dcc-chat-privmsg, erc-message-english-dcc-closed,
erc-message-english-dcc-command-undefined,
erc-message-english-dcc-ctcp-errmsg,
erc-message-english-dcc-ctcp-unknown,
erc-message-english-dcc-get-bytes-received,
erc-message-english-dcc-get-complete,
erc-message-english-dcc-get-failed,
erc-message-english-dcc-get-cmd-aborted,
erc-message-english-dcc-get-file-too-long,
erc-message-english-dcc-get-notfound,
erc-message-english-dcc-list-head, erc-message-english-dcc-list-line,
erc-message-english-dcc-list-item, erc-message-english-dcc-list-end,
erc-message-english-dcc-malformed,
erc-message-english-dcc-privileged-port,
erc-message-english-dcc-request-bogus,
erc-message-english-dcc-send-finished,
erc-message-english-dcc-send-offered,
erc-message-english-dcc-send-offer): Define at top level using
`defvar'.
* lisp/erc/erc-netsplit.el (erc-netsplit-mode, erc-netsplit-enable):
Don't call `erc-netsplit-install-message-catalogs'.
(erc-netsplit-install-message-catalogs): Deprecate function.
(erc-message-english-netsplit, erc-message-english-netjoin,
erc-message-english-netjoin-done, erc-message-english-netsplit-none,
erc-message-english-netsplit-wholeft): Define at top level using
`defvar'.
* lisp/erc/erc-notify.el (erc-notify-install-message-catalogs):
Deprecate, and rename all format templates with hyphens instead of
underscores.
(erc-notify-timer, erc-notify-JOIN, erc-notify-NICK, erc-notify-QUIT):
Use hyphenated template names.
(erc-cmd-NOTIFY): Use hyphenated template names.  Load the module when
necessary and emit a warning.  Otherwise, people who discover this
autoloaded command without being aware of the module's existence may
think it's "broken".
(pcomplete/erc-mode/NOTIFY): Replace top-level autoload with `require'
in function body.  Include `erc-notify-list' in list of completions,
which makes removal easier if you don't share any channels with a
person, and they're not in `erc-server-users'.  A better long-term
solution might be to WHOIS folks we're unsure about when they're
listed in a 303.
(erc-message-english-notify_current, erc-message-english-notify_list,
erc-message-english-notify_on, erc-message-english-notify_off): Define
at top level using `defvar'.  Replace nonstandard underscores with
hyphens.  Alias obsolete names.
* lisp/erc/erc-page.el (erc-message-english-CTCP-PAGE): Define at top
level using `defvar'.
* lisp/erc/erc-sasl.el (erc-message-english-s902,
erc-message-english-s904, erc-message-english-s905,
erc-message-english-s906, erc-message-english-s907,
erc-message-english-s908): Define at top level using `defvar'.
* lisp/erc/erc-sound.el (erc-message-english-CTCP-SOUND): Define using
`defvar'.
* lisp/erc/erc.el (erc--make-message-variable-name): New function to
replace `erc-make-message-variable-name' internally, where most uses
previously checked whether the returned variable was bound.  This
helper now does that conditionally, when asked.
(erc-make-message-variable-name): Defer to internal variant,
`erc--make-message-variable-name'.
(erc-define-catalog-entry, erc-define-catalog): Deprecate.
(erc-retrieve-catalog-entry): Refactor to favor
`default-toplevel-value' of `erc-current-message-catalog' before
falling back to `english'.  Not doing this was arguably a bug.
(erc-message-english-bad-ping-response,
erc-message-english-bad-syntax, erc-message-english-incorrect-args,
erc-message-english-cannot-find-file,
erc-message-english-cannot-read-file, erc-message-english-connect,
erc-message-english-country, erc-message-english-country-unknown,
erc-message-english-ctcp-empty, erc-message-english-ctcp-request,
erc-message-english-ctcp-request-to,
erc-message-english-ctcp-too-many, erc-message-english-flood-ctcp-off,
erc-message-english-flood-strict-mode,
erc-message-english-disconnected,
erc-message-english-disconnected-noreconnect,
erc-message-english-reconnecting,
erc-message-english-reconnect-canceled, erc-message-english-finished,
erc-message-english-terminated, erc-message-english-login,
erc-message-english-nick-in-use, erc-message-english-nick-too-long,
erc-message-english-no-default-channel,
erc-message-english-no-invitation, erc-message-english-no-target,
erc-message-english-ops, erc-message-english-ops-none,
erc-message-english-undefined-ctcp,
erc-message-english-user-mode-redundant-add,
erc-message-english-user-mode-redundant-drop,
erc-message-english-variable-not-bound, erc-message-english-ACTION,
erc-message-english-CTCP-CLIENTINFO, erc-message-english-CTCP-ECHO,
erc-message-english-CTCP-FINGER, erc-message-english-CTCP-PING,
erc-message-english-CTCP-TIME, erc-message-english-CTCP-UNKNOWN,
erc-message-english-CTCP-VERSION, erc-message-english-ERROR,
erc-message-english-INVITE, erc-message-english-JOIN,
erc-message-english-JOIN-you, erc-message-english-KICK,
erc-message-english-KICK-you, erc-message-english-KICK-by-you,
erc-message-english-MODE, erc-message-english-MODE-nick,
erc-message-english-NICK, erc-message-english-NICK-you,
erc-message-english-PART, erc-message-english-PING,
erc-message-english-PONG, erc-message-english-QUIT,
erc-message-english-TOPIC, erc-message-english-WALLOPS,
erc-message-english-s004, erc-message-english-s221,
erc-message-english-s252, erc-message-english-s253,
erc-message-english-s254, erc-message-english-s275,
erc-message-english-s301, erc-message-english-s303,
erc-message-english-s305, erc-message-english-s306,
erc-message-english-s307, erc-message-english-s311,
erc-message-english-s312, erc-message-english-s313,
erc-message-english-s314, erc-message-english-s317,
erc-message-english-s317-on-since, erc-message-english-s319,
erc-message-english-s320, erc-message-english-s321,
erc-message-english-s322, erc-message-english-s324,
erc-message-english-s328, erc-message-english-s329,
erc-message-english-s330, erc-message-english-s331,
erc-message-english-s332, erc-message-english-s333,
erc-message-english-s341, erc-message-english-s352,
erc-message-english-s353, erc-message-english-s367,
erc-message-english-s367-set-by, erc-message-english-s368,
erc-message-english-s379, erc-message-english-s391,
erc-message-english-s396, erc-message-english-s401,
erc-message-english-s402, erc-message-english-s403,
erc-message-english-s404, erc-message-english-s405,
erc-message-english-s406, erc-message-english-s412,
erc-message-english-s421, erc-message-english-s431,
erc-message-english-s432, erc-message-english-s442,
erc-message-english-s445, erc-message-english-s446,
erc-message-english-s451, erc-message-english-s461,
erc-message-english-s462, erc-message-english-s463,
erc-message-english-s464, erc-message-english-s465,
erc-message-english-s471, erc-message-english-s473,
erc-message-english-s474, erc-message-english-s475,
erc-message-english-s481, erc-message-english-s482,
erc-message-english-s483, erc-message-english-s484,
erc-message-english-s485, erc-message-english-s491,
erc-message-english-s501, erc-message-english-s502,
erc-message-english-s671): Define at top level using `defvar'.
* test/lisp/erc/erc-tests.el (erc-tests--string-to-propertized-parts,
erc-tests-pp-propertized-parts, erc--make-message-variable-name,
erc-retrieve-catalog-entry): New tests along with utility functions
and a convenience command for manipulating catalogs.  (Bug#67677)