* doc/misc/erc.texi (Integrations): Set `erc-server-reconnect-function'
to `erc-server-delayed-check-reconnect' in SOCKS example, and add
definition for `erc-open-socks-tls-stream'.  Mention possible
inaccuracies related to error detection with certain reconnect
strategies.
* lisp/erc/erc-backend.el (erc-server--reconnect-opened): New function.
(erc-server-delayed-check-reconnect): Attempt to reuse process if server
sends a complete PONG, and attempt to accommodate connectors that set
:nowait to nil.
(erc--server-delayed-check-connectors): Remove variable.
(erc-server-prefer-check-reconnect): Inline what was the internal
variable `erc--server-delayed-check-connectors' because it's no longer
used in unit tests.  Add `erc-open-socks-tls-stream' to the set of
connector functions thought to be compatible with the "check" reconnect
strategy.
* test/lisp/erc/erc-scenarios-base-auto-recon.el
(erc-scenarios-base-auto-recon-no-proto): Adapt to expect "reuse" behavior.
* test/lisp/erc/resources/base/reconnect/ping-pong.eld: Delete unused file.
* test/lisp/erc/resources/base/reconnect/unexpected-disconnect.eld:
Capture PING cookie to send back to client.
* test/lisp/erc/resources/erc-d/resources/proxy-solo.eld: Delete unused
file.  (Bug#62044)

* lisp/erc/erc-backend.el (erc-server-delayed-check-reconnect): Run
`reschedule' function on a timer to avoid growing the stack when
calling `delete-process'.
* lisp/erc/erc-common.el (erc--favor-changed-reverted-modules-state):
Fix `pcase' condition so that changing an option to its standard value
does not earn a "STANDARD" label in Customize if that value differs
from the saved one.
* lisp/erc/erc.el (erc-open-socks-tls-stream): Reword doc string.
* test/lisp/erc/erc-tests.el (erc--with-dependent-type-match)
(erc--with-dependent-type-match): Remove useless tests (bug#71178).
* test/lisp/erc/resources/base/reconnect/unexpected-disconnect.eld:
Await phantom EOFs and PINGs to somewhat account for a race that can
result in a failure when running the suite in parallel with -jN.
* test/lisp/erc/resources/erc-scenarios-common.el
(erc-scenarios-common--print-trace): Set `debug-on-error' to t
so that errors in timers always trigger test failures.
;; * test/lisp/erc/resources/base/assoc/reconplay/foonet.eld:
;; Timeouts.
;; * test/lisp/erc/resources/base/upstream-reconnect/soju-barnet.eld:
;; Timeouts.
;; * test/lisp/erc/resources/base/mask-target-routing/foonet.eld:
;; Timeouts.
;; * test/lisp/erc/resources/join/network-id/barnet.eld: Timeout.

* lisp/erc/erc-backend.el
(erc--wrangle-query-buffers-on-nick-change): New function for handling
buffer renaming and message routing triggered by a nick change.  Such
twiddling used to reside in `erc-server-NICK' but has been separated
out for use by built-in modules overriding `erc-server-NICK'.  The
behavior has also changed to favor always reusing an existing query
buffer whenever possible instead of creating a new, <N>-suffixed
buffer.  This addresses some arguably unfinished business from
bug#48598.
(erc-server-NICK): Fix erroneous call to `erc-update-user-nick' that
passed the sender's login as the function's INFO argument.  Move
buffer renaming logic to `erc--wrangle-query-buffers-on-nick-change'
for use by "NICK" handlers managed by modules.  Also, print the notice
in all query buffers when the client changes its own nick.
(erc-server-QUIT): Show messages in all query buffers when the client
itself quits, but prevent `track' from updating the mode line with
redundant noise.
* lisp/erc/erc.el (erc-generate-new-buffer-name): Fix typo in doc.
(erc--query-list): New function.
* test/lisp/erc/erc-scenarios-base-query-participants.el: New file.
* test/lisp/erc/erc-scenarios-base-renick.el
(erc-scenarios-base-renick-queries-solo): Revise slightly to use
modern helper API.
(erc-scenarios-base-renick-queries/reassume): New test.
(erc-scenarios-base-renick-self/merge-query): New test.
* test/lisp/erc/resources/base/query-participants/legacy.eld: New file.
* test/lisp/erc/resources/base/reconnect/options-again.eld: Adjust
timeout.
* test/lisp/erc/resources/base/renick/queries/reassume.eld: New file.
* test/lisp/erc/resources/base/renick/self/manual.eld: Update timeouts.
* test/lisp/erc/resources/base/renick/self/merge-query-a.eld: New file.
* test/lisp/erc/resources/base/renick/self/merge-query-b.eld: New file.
(Bug#70928)

* lisp/erc/erc.el (erc--process-channel-modes): Use format spec
catalog entry, and convert char to string.
(erc-message-english-channel-mode-unknown): New variable.
;; * test/lisp/erc/erc-scenarios-base-renick.el
;; (erc-scenarios-base-renick-queries-solo): Adjust timeout.
;; * test/lisp/erc/erc-scenarios-ignore.el (erc-scenarios-ignore/basic):
;; Adjust timeouts.
;; * test/lisp/erc/erc-scenarios-misc.el (erc-scenarios-base-flood):
;; Adjust timeouts.
;; * test/lisp/erc/resources/base/assoc/bouncer-history/barnet.eld:
;; Adjust timeouts.
;; * test/lisp/erc/resources/base/reuse-buffers/channel/barnet.eld:
;; Adjust timeouts.
;; * test/lisp/erc/resources/erc-d/erc-d-tests.el (erc-d-run-basic):
;; Adjust timeouts.
;; * test/lisp/erc/resources/sasl/plain.eld: Adjust timeouts.
;; * test/lisp/erc/resources/sasl/external.eld: Adjust timeout.
;; * test/lisp/erc/resources/base/auth-source/foonet.eld: Adjust
;; timeout.

* lisp/erc/erc-networks.el (erc-networks--examine-targets): Adopt the
server's network ID in query buffers created before MOTD's end.  Do
this to avoid a type error in the process filter when renaming
buffers.
* lisp/erc/erc-networks.el (erc-networks--examine-targets): New test.
* test/lisp/erc/erc-scenarios-base-upstream-recon-znc.el
(erc-scenarios-upstream-recon--znc/severed): New test.
* test/lisp/erc/erc-scenarios-misc.el
(erc-scenarios-base-mask-target-routing): Adjust timeout.
* test/lisp/erc/resources/base/upstream-reconnect/znc-severed.eld:
New file.
* test/lisp/erc/resources/erc-tests-common.el
(erc-tests-common-make-server-buf): Use NAME parameter for creating
ID.

* lisp/erc/erc-backend.el (erc--with-isupport-data): Add comment for
possibly superior alternate implementation.
* lisp/erc/erc-common.el (erc--get-isupport-entry): Use helper to
initialize traditional prefix slots in overridden well-known
constructor.
(erc--parsed-prefix): Reverse order of characters in the `letters'
and `statuses' slots, in their defaults and also their definitions.
(erc--strpos): New function, a utility for finding a single character
in a string.
* lisp/erc/erc.el (erc--define-channel-user-status-compat-getter):
Modify to query advertised value for associated mode letter at runtime
instead of baking it in.
(erc-channel-user-voice, erc-channel-user-halfop, erc-channel-user-op,
erc-channel-user-admin, erc-channel-user-owner): Supply second
argument for fallback mode letter.
(erc--cusr-status-p, erc--cusr-change-status): New functions for
querying and modifying `erc-channel-user' statuses.
(erc-send-input-line): Update speaker time in own nick's
`erc-channel-member' entry.
(erc-get-channel-membership-prefix): Adapt code to prefer advertised
prefix for mode letter.
(erc--parsed-prefix): Save "reversed" `letters' and `statuses' so that
they're ordered from lowest to highest semantically.
(erc--get-prefix-flag, erc--init-cusr-fallback-status,
erc--compute-cusr-fallback-status): New functions for retrieving
internal prefix values and massaging hard-coded traditional prefixes
so they're compatible with existing `erc-channel-member' update code.
(erc--partition-prefixed-names): New function, separated for testing
and for conversion to a generic in the future when ERC supports
extensions that list member rolls in a different format.
(erc-channel-receive-names): Refactor to use new status-aware update
and init workhorse functions for updating and initializing a
`erc-channel-members' entry.
(erc--create-current-channel-member): New "status-aware" function
comprising the `addp' path of `erc-update-current-channel-member'.
(erc--update-current-channel-member): New "status-aware" function
comprising the "update" path of `erc-update-current-channel-member',
which ran when an existing `erc-channel-members' entry for the queried
nick was found.
(erc-update-current-channel-member): Split code body into two
constituent functions, both for readability and for usability, so
callers can more explicitly request the desired operation in a
"status-aware" manner.
(erc--update-membership-prefix): Remove unused function, originally
meant to be new in ERC 5.6.
(erc--process-channel-modes): Call `erc--cusr-change-status' instead
of `erc--update-membership-prefix'.
(erc--shuffle-nuh-nickward): New utility function to ensure code like
`erc--partition-prefixed-names' can use `erc--parse-nuh' in a
practical and relatively convenient way in the near future.
* test/lisp/erc/erc-scenarios-base-chan-modes.el
(erc-scenarios-base-chan-modes--speaker-status): New test.
* test/lisp/erc/erc-tests.el (erc--parsed-prefix): Reverse expected
order of various slot values in `erc--parsed-prefix' objects.
(erc--get-prefix-flag, erc--init-cusr-fallback-status,
erc--compute-cusr-fallback-status, erc--cusr-status-p,
erc--cusr-change-status): New tests.
(erc--update-channel-modes, erc-process-input-line): Use newly
available utilities imported from common library.
* test/lisp/erc/resources/base/modes/speaker-status.eld: New file.
(Bug#67220)

* test/lisp/erc/erc-fill-tests.el
(erc-fill-wrap--monospace, erc-fill-wrap--merge,
erc-fill-wrap-tests--merge-action,
erc-fill-wrap-tests--merge-action/indicator-pre,
erc-fill-wrap-tests--merge-action/indicator-post,
erc-fill-line-spacing, erc-fill-wrap-visual-keys--body,
erc-fill-wrap-visual-keys--prompt, erc-fill--left-hand-stamps): Tag as
:erc--graphcial.
* test/lisp/erc/erc-scenarios-internal.el
(erc-scenarios-internal--run-interactive-all): New test to assist ERC
contributors in -jN parallel runs.
* test/lisp/erc/erc-scenarios-scrolltobottom-relaxed.el
(erc-scenarios-scrolltobottom--relaxed): Tag as :erc--graphical.
* test/lisp/erc/erc-scenarios-scrolltobottom.el
(erc-scenarios-scrolltobottom--normal,
erc-scenarios-scrolltobottom--all): Tag as :erc--graphical.
* test/lisp/erc/erc-scenarios-status-sidebar.el
(erc-scenarios-status-sidebar--nickbar): Tag as :erc--graphical.
* test/lisp/erc/erc-tests.el (erc--channel-modes/graphic-p): Tag as
:erc--graphical.
* test/lisp/erc/resources/base/local-modules/first.eld: Timeouts.
* test/lisp/erc/resources/erc-scenarios-common.el
(erc-scenarios-common--graphical-p): New variable.
(erc-scenarios-common--make-bindings): Don't enable
`inhibit-interaction' when interactive.  Set
`erc-scenarios-common--graphical-p' flag when
`:erc--graphical' tag present and running interactively.
(erc-scenarios-common-with-cleanup): Account for variable
`erc-scenarios-common--graphical-p'.
(erc-scenarios-common-scrolltobottom--normal): Turn off
`erc-scrolltobottom-mode' when test finishes so as not to pollute when
running multiple interactive tests.
; * test/lisp/erc/resources/join/network-id/barnet.eld: Timeouts.

* doc/misc/erc.texi: Replace option `erc-format-nick-function' with
`erc-show-speaker-membership-status'.
* etc/ERC-NEWS: Mention shift to template-based speaker formatting.
Also mention in-buffer STATUSMSG support and various name changes and
new formatting-related options.
* lisp/erc/erc-backend.el (erc-format-privmessage): Remove forward
declaration.
(erc--determine-speaker-message-format-args): Add forward declaration.
(erc--statusmsg-target): New utility function for detecting whether
the current target is status-prefixed.
(erc-current-message-catalog): Move here from lisp/erc/erc.el.
(erc--message-speaker-catalog): New variable.
(erc--speaker-status-prefix-wanted-p): New variable specifically for
the function `erc-format-@nick' to signal it wants status-prefixes
prepended to the displayed nick.
(erc-server-PRIVMSG): Initialize `let'-bound value of
`erc--msg-prop-overrides' to a dummy `erc--tmp' property with a null
value that `erc-display-message' will "strip" before calling its
hooks.  Move away from the rather blunt symbol `msg' as a useful value
for `erc--msg'.  Instead, allow `erc-display-message' to assign the
most appropriate value based on context.  Also, bind the variable
`erc-current-message-catalog' to whatever the buffer's
`erc--message-speaker-catalog' happens to be.  Future internal modules
can set this to alternative catalogs as needed.  Additionally, detect
STATUSMSG prefixes on targets and inform the formatting logic of the
verdict.  Lastly, and most importantly, use the function
`erc--determine-speaker-message-format-args' instead of
`erc-format-privmessage' for message formatting.  Pass along the
returned "catalog key" and spec parameters to `erc-display-message'.
However, for NOTICEs, continue to render the string, as before, for
the two "echo notice" hooks.
* lisp/erc/erc-common.el (erc--ctcp-response): New "subsclass" of
`erc-response' for smuggling extra information to CTCP query handlers
in a mostly backwards-compatible way.  The same approach could be
taken with the "echo notice" hooks mentioned above.
* lisp/erc/erc-dcc.el (erc-dcc-chat-filter): Add `erc--spkr' and
`erc--speaker' properties even though these chat buffers are not
`erc-mode' buffers.
* lisp/erc/erc-fill.el (erc-fill--wrap-last-msg,
erc-fill--wrap-max-lull): Add doc strings.
(erc-fill--wrap-continued-message-p): Rework to look for `erc--spkr'-
`erc--msg' combinations as indicators of speaker continuity.
(erc-fill--wrap-rejigger-region): Remove reference to the no longer
relevant `erc-stamp-type'.  Instead, use the `erc--msg' property
combined with the `erc-timestamp' field to detect date stamps because
all are currently left-sided.
* lisp/erc/erc-stamp.el (erc-stamp--propertize-left-date-stamp): Don't
add superfluous `erc-stamp-type' property.
* lisp/erc/erc.el (erc--msg-props): Revise purpose and meaning of
`erc--msg' by removing possible value `msg', which was previously
meant to indicate that a message had a "speaker".  Instead, rely on
the separate `erc--spkr' property to convey this information, with
`erc--msg' now expressing a "type" or "role".
(erc--use-language-catalog-for-ctcp-action-p): New variable, a
compatibility switch to help transition from the `ACTION' entry of the
language catalog to the `ctcp-action' family of entries in the new
`-speaker' catalog.
(erc--ensure-spkr-prop): Update to include any passed-in environmental
overrides.
(erc--send-action-display): Restore pre-5.6 behavior when
compatibility flag enabled.  Otherwise, use new `-speaker' catalog for
formatting inserted message.
(erc--send-message-external): Overhaul to behave more faithfully in
mimicking a line submitted at the prompt of the current target buffer.
(erc--own-property-names): Remove `erc-stamp-type'.
(erc-ensure-target-buffer-on-privmsg): Add new choice variant for old
default behavior and change meaning of default to mean "except for
STATUSMSGs".  This option is newly revived for ERC 5.6.
(erc--message-speaker-statusmsg, erc--message-speaker-statusmsg-input,
erc--message-speaker-input, erc--message-speaker-input-chan-privmsg,
erc--message-speaker-input-chan-notice,
erc--message-speaker-input-query-privmsg,
erc--message-speaker-input-query-notice,
erc--message-speaker-chan-privmsg, erc--message-speaker-query-privmsg,
erc--message-speaker-chan-notice, erc--message-speaker-query-notice,
erc--message-speaker-ctcp-action,
erc--message-speaker-ctcp-action-input,
erc--message-speaker-ctcp-action-statusmsg,
erc--message-speaker-ctcp-action-statusmsg-input): New variables for
new `speaker' format-template catalog.
(erc--speakerize-nick): New helper function.
(erc--determine-speaker-message-format-args): New function to find the
appropriate format key from various contextual parameters.  Could
become the default of a function-valued variable for internal use.
(erc-show-speaker-membership-status): New option.
(erc-format-nick-function, erc-speaker-from-channel-member-function):
Declare former as an obsolete alias for the latter, and redefine
purpose slightly.
(erc-format-nick-function, erc-determine-speaker-from-user): Rename
former to latter and obsolete the old name.
(erc-format-nick, erc-determine-speaker-from-user): Rename former to
latter and obsolete old name.
(erc-format-@nick): Deprecate and adapt for use with new
template-based formatting paradigm.
(erc-format-my-nick): Move `erc-speaker' text prop toward head of
list, meaning it will end up beneath `font-lock-face' in the final
output.
(erc--format-speaker-input-message): New function to replace
`erc-format-my-nick' in-tree.
(erc-process-ctcp-query): Don't bind `erc--msg' to `msg'.  Instead,
rely on `erc-display-message' to set it to the current template key.
(erc-ctcp-query-ACTION): Prefer using formatting template, but attempt
to simulate pre-5.6 behavior when compatibility flag enabled.
(erc-display-msg): Use `erc--format-speaker-input-message' instead of
`erc-format-my-nick'.  Ignore `erc--msg-prop-overrides' with null
values.
(erc-current-message-catalog): Move to erc-backend.el.
* test/lisp/erc/erc-scenarios-base-statusmsg.el: New file.
* test/lisp/erc/erc-scenarios-stamp.el
(erc-scenarios-stamp--left/display-margin-mode): Expect format catalog
key instead of unhelpful `msg' as value of `erc--msg' prop.
* test/lisp/erc/erc-tests.el (erc-message): Render format template in
mock function and expect string in assertions.
(erc-tests--format-privmessage): New function, a helper for the
following test.
(erc-format-privmessage, erc--determine-speaker-message-format-args):
Rename former to latter and suppress deprecation warning.
(erc--determine-speaker-message-format-args/queries,
erc--determine-speaker-message-format-args/queries-as-channel): New
tests.
(erc-tests--format-my-nick): New helper function for the following
test.
(erc--format-speaker-input-message): New test.
* test/lisp/erc/resources/base/display-message/statusmsg.eld: New
file.  (Bug#67677)
; * test/lisp/erc/resources/fill/snapshots/merge-wrap-01.eld: Update.
; * test/lisp/erc/resources/fill/snapshots/merge-wrap-indicator-post-01.eld:
; Update.
; * test/lisp/erc/resources/fill/snapshots/merge-wrap-indicator-pre-01.eld:
; Update.

* test/lisp/erc/erc-scenarios-auth-source.el
(erc-scenarios-common--auth-source): Extend timeout.
* test/lisp/erc/erc-scenarios-base-buffer-display.el
(erc-scenarios-base-buffer-display--count-reset-timeout): Await
initial condition.
* test/lisp/erc/erc-scenarios-base-renick.el
(erc-scenarios-base-renick-queries-solo): Extend timeout.
* test/lisp/erc/erc-scenarios-misc.el (erc-scenarios-base-flood):
Extend timeout.
* test/lisp/erc/erc-tests.el (erc--channel-modes): Mark test as
:unstable pending further investigation.  This test has been shown to
be unreliable, possibly because it expects Emacs to report characters
being a certain width in all environments.  Thanks to Mattias
Engdegård for reporting this failure.
* test/lisp/erc/resources/base/reuse-buffers/server/barnet.eld:
Extend timeouts.
* test/lisp/erc/resources/base/reuse-buffers/server/foonet.eld:
Extend timeouts.

* etc/ERC-NEWS: Mention shift toward CHANMODES ISUPPORT parameter for
dictating MODE parsing behavior.
* lisp/erc/erc-backend.el (erc--init-channel-modes, erc--update-modes,
erc-set-modes, erc-update-modes): Forward declarations, the last two
being removals.
(erc-server-MODE, erc-server-221): Use `erc--update-modes' instead of
`erc-update-modes'.
(erc-server-324): Use `erc--init-channel-modes' instead of
`erc-set-modes'.
* lisp/erc/erc-common.el (erc--channel-mode-types): New struct for
stashing processed \"CHANMODES\" data for the current server.
* lisp/erc/erc.el (erc-channel-modes): Fix doc string.
(erc-set-initial-user-mode): Display a local notice when requesting
redundant user MODE operations.
(erc-set-modes, erc-parse-modes, erc-update-modes): Deprecate for
reasons explained in associated ERC-NEWS entry.
(erc--update-membership-prefix): New function, a helper for specifying
arguments to the rather unruly `erc-update-current-channel-member'.
(erc--channel-modes): New variable to record channel-mode state in a
hash table.
(erc--channel-mode-types): New variable and getter to stash
and retrieve server-local instance of the struct of the same name.
(erc--process-channel-modes): New function to parse channel-mode
changes, dispatch handlers for unary modes, and update the local
variables `erc-channel-modes' and `erc--channel-modes'.
(erc--user-modes): New local variable for remembering user modes per
server.  New function of the same name, a "getter" for the variable.
(erc--parse-user-modes): New function to parse user modes only.
(erc--update-user-modes): New function to update and sort
`erc--user-modes'.
(erc--update-channel-modes): New function to replace much of
`erc-update-modes', currently a thin wrapper around
`erc--process-channel-modes' to ensure it updates status prefixes.
(erc--update-modes): New function to call appropriate mode-updating
function for the current buffer.
(erc--init-channel-modes): New function to update channel mode letters
without status prefixes.
(erc--handle-channel-mode): New generic function, a placeholder for an
eventual API to handle specific "unary" mode letters, meaning those
that specify a single parameter for setting or unsetting.
(erc-update-channel-limit): Update doc string and answer question
posed by ancient comment.
(erc-message-english-user-mode-redundant-add,
erc-message-english-user-mode-redundant-drop): New English catalog
messages.
* test/lisp/erc/erc-scenarios-base-chan-modes.el: New file.
* test/lisp/erc/erc-tests.el (erc-parse-modes,
erc--update-channel-modes, erc--update-user-modes, erc--user-modes,
erc--parse-user-modes): New tests.
* test/lisp/erc/resources/base/modes/chan-changed.eld: New test data
file.  (Bug#67220)