code.delx.au - gnu-emacs/blob - lisp/erc/erc-backend.el

   1 ;;; erc-backend.el --- Backend network communication for ERC
   2
   3 ;; Copyright (C) 2004-2015 Free Software Foundation, Inc.
   4
   5 ;; Filename: erc-backend.el
   6 ;; Author: Lawrence Mitchell <wence@gmx.li>
   7 ;; Maintainer: emacs-devel@gnu.org
   8 ;; Created: 2004-05-7
   9 ;; Keywords: IRC chat client internet
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software: you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation, either version 3 of the License, or
  16 ;; (at your option) any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; This file defines backend network communication handlers for ERC.
  29 ;;
  30 ;; How things work:
  31 ;;
  32 ;; You define a new handler with `define-erc-response-handler'.  This
  33 ;; defines a function, a corresponding hook variable, and populates a
  34 ;; global hash table `erc-server-responses' with a map from response
  35 ;; to hook variable.  See the function documentation for more
  36 ;; information.
  37 ;;
  38 ;; Upon receiving a line from the server, `erc-parse-server-response'
  39 ;; is called on it.
  40 ;;
  41 ;; A line generally looks like:
  42 ;;
  43 ;; LINE := ':' SENDER ' ' COMMAND ' ' (COMMAND-ARGS ' ')* ':' CONTENTS
  44 ;; SENDER := Not ':' | ' '
  45 ;; COMMAND := Not ':' | ' '
  46 ;; COMMAND-ARGS := Not ':' | ' '
  47 ;;
  48 ;; This gets parsed and stuffed into an `erc-response' struct.  You
  49 ;; can access the fields of the struct with:
  50 ;;
  51 ;; COMMAND --- `erc-response.command'
  52 ;; COMMAND-ARGS --- `erc-response.command-args'
  53 ;; CONTENTS --- `erc-response.contents'
  54 ;; SENDER --- `erc-response.sender'
  55 ;; LINE --- `erc-response.unparsed'
  56 ;;
  57 ;; WARNING, WARNING!!
  58 ;; It's probably not a good idea to destructively modify the list
  59 ;; of command-args in your handlers, since other functions down the
  60 ;; line may well need to access the arguments too.
  61 ;;
  62 ;; That is, unless you're /absolutely/ sure that your handler doesn't
  63 ;; invoke some other function that needs to use COMMAND-ARGS, don't do
  64 ;; something like
  65 ;;
  66 ;; (while (erc-response.command-args parsed)
  67 ;;   (let ((a (pop (erc-response.command-args parsed))))
  68 ;;     ...))
  69 ;;
  70 ;; The parsed response is handed over to
  71 ;; `erc-handle-parsed-server-response', which checks whether it should
  72 ;; carry out duplicate suppression, and then runs `erc-call-hooks'.
  73 ;; `erc-call-hooks' retrieves the relevant hook variable from
  74 ;; `erc-server-responses' and runs it.
  75 ;;
  76 ;; Most handlers then destructure the parsed response in some way
  77 ;; (depending on what the handler is, the arguments have different
  78 ;; meanings), and generally display something, usually using
  79 ;; `erc-display-message'.
  80
  81 ;;; TODO:
  82
  83 ;; o Generalize the display-line code so that we can use it to
  84 ;;   display the stuff we send, as well as the stuff we receive.
  85 ;;   Then, move all display-related code into another backend-like
  86 ;;   file, erc-display.el, say.
  87 ;;
  88 ;; o Clean up the handlers using new display code (has to be written
  89 ;;   first).
  90
  91 ;;; History:
  92
  93 ;; 2004/05/10 -- Handler bodies taken out of erc.el and ported to new
  94 ;;               interface.
  95
  96 ;; 2005-08-13 -- Moved sending commands from erc.el.
  97
  98 ;;; Code:
  99
 100 (require 'erc-compat)
 101 (eval-when-compile (require 'cl-lib))
 102 ;; There's a fairly strong mutual dependency between erc.el and erc-backend.el.
 103 ;; Luckily, erc.el does not need erc-backend.el for macroexpansion whereas the
 104 ;; reverse is true:
 105 (provide 'erc-backend)
 106 (require 'erc)
 107
 108 ;;;; Variables and options
 109
 110 (defvar erc-server-responses (make-hash-table :test #'equal)
 111   "Hashtable mapping server responses to their handler hooks.")
 112
 113 (cl-defstruct (erc-response (:conc-name erc-response.))
 114   (unparsed "" :type string)
 115   (sender "" :type string)
 116   (command "" :type string)
 117   (command-args '() :type list)
 118   (contents "" :type string))
 119
 120 ;;; User data
 121
 122 (defvar erc-server-current-nick nil
 123   "Nickname on the current server.
 124 Use `erc-current-nick' to access this.")
 125 (make-variable-buffer-local 'erc-server-current-nick)
 126
 127 ;;; Server attributes
 128
 129 (defvar erc-server-process nil
 130   "The process object of the corresponding server connection.")
 131 (make-variable-buffer-local 'erc-server-process)
 132
 133 (defvar erc-session-server nil
 134   "The server name used to connect to for this session.")
 135 (make-variable-buffer-local 'erc-session-server)
 136
 137 (defvar erc-session-connector nil
 138   "The function used to connect to this session (nil for the default).")
 139 (make-variable-buffer-local 'erc-session-connector)
 140
 141 (defvar erc-session-port nil
 142   "The port used to connect to.")
 143 (make-variable-buffer-local 'erc-session-port)
 144
 145 (defvar erc-server-announced-name nil
 146   "The name the server announced to use.")
 147 (make-variable-buffer-local 'erc-server-announced-name)
 148
 149 (defvar erc-server-version nil
 150   "The name and version of the server's ircd.")
 151 (make-variable-buffer-local 'erc-server-version)
 152
 153 (defvar erc-server-parameters nil
 154   "Alist listing the supported server parameters.
 155
 156 This is only set if the server sends 005 messages saying what is
 157 supported on the server.
 158
 159 Entries are of the form:
 160   (PARAMETER . VALUE)
 161 or
 162   (PARAMETER) if no value is provided.
 163
 164 Some examples of possible parameters sent by servers:
 165 CHANMODES=b,k,l,imnpst - list of supported channel modes
 166 CHANNELLEN=50 - maximum length of channel names
 167 CHANTYPES=#&!+ - supported channel prefixes
 168 CHARMAPPING=rfc1459 - character mapping used for nickname and channels
 169 KICKLEN=160 - maximum allowed kick message length
 170 MAXBANS=30 - maximum number of bans per channel
 171 MAXCHANNELS=10 - maximum number of channels allowed to join
 172 NETWORK=EFnet -  the network identifier
 173 NICKLEN=9 - maximum allowed length of nicknames
 174 PREFIX=(ov)@+ - list of channel modes and the user prefixes if user has mode
 175 RFC2812 - server supports RFC 2812 features
 176 SILENCE=10 - supports the SILENCE command, maximum allowed number of entries
 177 TOPICLEN=160 - maximum allowed topic length
 178 WALLCHOPS - supports sending messages to all operators in a channel")
 179 (make-variable-buffer-local 'erc-server-parameters)
 180
 181 ;;; Server and connection state
 182
 183 (defvar erc-server-ping-timer-alist nil
 184   "Mapping of server buffers to their specific ping timer.")
 185
 186 (defvar erc-server-connected nil
 187   "Non-nil if the current buffer has been used by ERC to establish
 188 an IRC connection.
 189
 190 If you wish to determine whether an IRC connection is currently
 191 active, use the `erc-server-process-alive' function instead.")
 192 (make-variable-buffer-local 'erc-server-connected)
 193
 194 (defvar erc-server-reconnect-count 0
 195   "Number of times we have failed to reconnect to the current server.")
 196 (make-variable-buffer-local 'erc-server-reconnect-count)
 197
 198 (defvar erc-server-quitting nil
 199   "Non-nil if the user requests a quit.")
 200 (make-variable-buffer-local 'erc-server-quitting)
 201
 202 (defvar erc-server-reconnecting nil
 203   "Non-nil if the user requests an explicit reconnect, and the
 204 current IRC process is still alive.")
 205 (make-variable-buffer-local 'erc-server-reconnecting)
 206
 207 (defvar erc-server-timed-out nil
 208   "Non-nil if the IRC server failed to respond to a ping.")
 209 (make-variable-buffer-local 'erc-server-timed-out)
 210
 211 (defvar erc-server-banned nil
 212   "Non-nil if the user is denied access because of a server ban.")
 213 (make-variable-buffer-local 'erc-server-banned)
 214
 215 (defvar erc-server-error-occurred nil
 216   "Non-nil if the user triggers some server error.")
 217 (make-variable-buffer-local 'erc-server-error-occurred)
 218
 219 (defvar erc-server-lines-sent nil
 220   "Line counter.")
 221 (make-variable-buffer-local 'erc-server-lines-sent)
 222
 223 (defvar erc-server-last-peers '(nil . nil)
 224   "Last peers used, both sender and receiver.
 225 Those are used for /MSG destination shortcuts.")
 226 (make-variable-buffer-local 'erc-server-last-peers)
 227
 228 (defvar erc-server-last-sent-time nil
 229   "Time the message was sent.
 230 This is useful for flood protection.")
 231 (make-variable-buffer-local 'erc-server-last-sent-time)
 232
 233 (defvar erc-server-last-ping-time nil
 234   "Time the last ping was sent.
 235 This is useful for flood protection.")
 236 (make-variable-buffer-local 'erc-server-last-ping-time)
 237
 238 (defvar erc-server-last-received-time nil
 239   "Time the last message was received from the server.
 240 This is useful for detecting hung connections.")
 241 (make-variable-buffer-local 'erc-server-last-received-time)
 242
 243 (defvar erc-server-lag nil
 244   "Calculated server lag time in seconds.
 245 This variable is only set in a server buffer.")
 246 (make-variable-buffer-local 'erc-server-lag)
 247
 248 (defvar erc-server-filter-data nil
 249   "The data that arrived from the server
 250 but has not been processed yet.")
 251 (make-variable-buffer-local 'erc-server-filter-data)
 252
 253 (defvar erc-server-duplicates (make-hash-table :test 'equal)
 254   "Internal variable used to track duplicate messages.")
 255 (make-variable-buffer-local 'erc-server-duplicates)
 256
 257 ;; From Circe
 258 (defvar erc-server-processing-p nil
 259   "Non-nil when we're currently processing a message.
 260
 261 When ERC receives a private message, it sets up a new buffer for
 262 this query.  These in turn, though, do start flyspell. This
 263 involves starting an external process, in which case Emacs will
 264 wait - and when it waits, it does accept other stuff from, say,
 265 network exceptions.  So, if someone sends you two messages
 266 quickly after each other, ispell is started for the first, but
 267 might take long enough for the second message to be processed
 268 first.")
 269 (make-variable-buffer-local 'erc-server-processing-p)
 270
 271 (defvar erc-server-flood-last-message 0
 272   "When we sent the last message.
 273 See `erc-server-flood-margin' for an explanation of the flood
 274 protection algorithm.")
 275 (make-variable-buffer-local 'erc-server-flood-last-message)
 276
 277 (defvar erc-server-flood-queue nil
 278   "The queue of messages waiting to be sent to the server.
 279 See `erc-server-flood-margin' for an explanation of the flood
 280 protection algorithm.")
 281 (make-variable-buffer-local 'erc-server-flood-queue)
 282
 283 (defvar erc-server-flood-timer nil
 284   "The timer to resume sending.")
 285 (make-variable-buffer-local 'erc-server-flood-timer)
 286
 287 ;;; IRC protocol and misc options
 288
 289 (defgroup erc-server nil
 290   "Parameters for dealing with IRC servers."
 291   :group 'erc)
 292
 293 (defcustom erc-server-auto-reconnect t
 294   "Non-nil means that ERC will attempt to reestablish broken connections.
 295
 296 Reconnection will happen automatically for any unexpected disconnection."
 297   :group 'erc-server
 298   :type 'boolean)
 299
 300 (defcustom erc-server-reconnect-attempts 2
 301   "The number of times that ERC will attempt to reestablish a
 302 broken connection, or t to always attempt to reconnect.
 303
 304 This only has an effect if `erc-server-auto-reconnect' is non-nil."
 305   :group 'erc-server
 306   :type '(choice (const :tag "Always reconnect" t)
 307                  integer))
 308
 309 (defcustom erc-server-reconnect-timeout 1
 310   "The amount of time, in seconds, that ERC will wait between
 311 successive reconnect attempts.
 312
 313 If a key is pressed while ERC is waiting, it will stop waiting."
 314   :group 'erc-server
 315   :type 'number)
 316
 317 (defcustom erc-split-line-length 440
 318   "The maximum length of a single message.
 319 If a message exceeds this size, it is broken into multiple ones.
 320
 321 IRC allows for lines up to 512 bytes. Two of them are CR LF.
 322 And a typical message looks like this:
 323
 324   :nicky!uhuser@host212223.dialin.fnordisp.net PRIVMSG #lazybastards :Hello!
 325
 326 You can limit here the maximum length of the \"Hello!\" part.
 327 Good luck."
 328   :type 'integer
 329   :group 'erc-server)
 330
 331 (defcustom erc-coding-system-precedence '(utf-8 undecided)
 332   "List of coding systems to be preferred when receiving a string from the server.
 333 This will only be consulted if the coding system in
 334 `erc-server-coding-system' is `undecided'."
 335   :group 'erc-server
 336   :version "24.1"
 337   :type '(repeat coding-system))
 338
 339 (defcustom erc-server-coding-system (if (and (fboundp 'coding-system-p)
 340                                              (coding-system-p 'undecided)
 341                                              (coding-system-p 'utf-8))
 342                                         '(utf-8 . undecided)
 343                                       nil)
 344   "The default coding system for incoming and outgoing text.
 345 This is either a coding system, a cons, a function, or nil.
 346
 347 If a cons, the encoding system for outgoing text is in the car
 348 and the decoding system for incoming text is in the cdr. The most
 349 interesting use for this is to put `undecided' in the cdr. This
 350 means that `erc-coding-system-precedence' will be consulted, and the
 351 first match there will be used.
 352
 353 If a function, it is called with the argument `target' and should
 354 return a coding system or a cons as described above.
 355
 356 If you need to send non-ASCII text to people not using a client that
 357 does decoding on its own, you must tell ERC what encoding to use.
 358 Emacs cannot guess it, since it does not know what the people on the
 359 other end of the line are using."
 360   :group 'erc-server
 361   :type '(choice (const :tag "None" nil)
 362                  coding-system
 363                  (cons (coding-system :tag "encoding" :value utf-8)
 364                        (coding-system :tag "decoding" :value undecided))
 365                  function))
 366
 367 (defcustom erc-encoding-coding-alist nil
 368   "Alist of target regexp and coding-system pairs to use.
 369 This overrides `erc-server-coding-system' depending on the
 370 current target as returned by `erc-default-target'.
 371
 372 Example: If you know that the channel #linux-ru uses the coding-system
 373 `cyrillic-koi8', then add '(\"#linux-ru\" . cyrillic-koi8) to the
 374 alist."
 375   :group 'erc-server
 376   :type '(repeat (cons (string :tag "Target")
 377                        coding-system)))
 378
 379 (defcustom erc-server-connect-function 'open-network-stream
 380   "Function used to initiate a connection.
 381 It should take same arguments as `open-network-stream' does."
 382   :group 'erc-server
 383   :type 'function)
 384
 385 (defcustom erc-server-prevent-duplicates '("301")
 386   "Either nil or a list of strings.
 387 Each string is a IRC message type, like PRIVMSG or NOTICE.
 388 All Message types in that list of subjected to duplicate prevention."
 389   :type '(choice (const nil) (list string))
 390   :group 'erc-server)
 391
 392 (defcustom erc-server-duplicate-timeout 60
 393   "The time allowed in seconds between duplicate messages.
 394
 395 If two identical messages arrive within this value of one another, the second
 396 isn't displayed."
 397   :type 'integer
 398   :group 'erc-server)
 399
 400 (defcustom erc-server-timestamp-format "%Y-%m-%d %T"
 401   "Timestamp format used with server response messages.
 402 This string is processed using `format-time-string'."
 403   :version "24.3"
 404   :type 'string
 405   :group 'erc-server)
 406
 407 ;;; Flood-related
 408
 409 ;; Most of this is courtesy of Jorgen Schaefer and Circe
 410 ;; (http://www.nongnu.org/circe)
 411
 412 (defcustom erc-server-flood-margin 10
 413   "A margin on how much excess data we send.
 414 The flood protection algorithm of ERC works like the one
 415 detailed in RFC 2813, section 5.8 \"Flood control of clients\".
 416
 417   * If `erc-server-flood-last-message' is less than the current
 418     time, set it equal.
 419   * While `erc-server-flood-last-message' is less than
 420     `erc-server-flood-margin' seconds ahead of the current
 421     time, send a message, and increase
 422     `erc-server-flood-last-message' by
 423     `erc-server-flood-penalty' for each message."
 424   :type 'integer
 425   :group 'erc-server)
 426
 427 (defcustom erc-server-flood-penalty 3
 428   "How much we penalize a message.
 429 See `erc-server-flood-margin' for an explanation of the flood
 430 protection algorithm."
 431   :type 'integer
 432   :group 'erc-server)
 433
 434 ;; Ping handling
 435
 436 (defcustom erc-server-send-ping-interval 30
 437   "Interval of sending pings to the server, in seconds.
 438 If this is set to nil, pinging the server is disabled."
 439   :group 'erc-server
 440   :type '(choice (const :tag "Disabled" nil)
 441                  (integer :tag "Seconds")))
 442
 443 (defcustom erc-server-send-ping-timeout 120
 444   "If the time between ping and response is greater than this, reconnect.
 445 The time is in seconds.
 446
 447 This must be greater than or equal to the value for
 448 `erc-server-send-ping-interval'.
 449
 450 If this is set to nil, never try to reconnect."
 451   :group 'erc-server
 452   :type '(choice (const :tag "Disabled" nil)
 453                  (integer :tag "Seconds")))
 454
 455 (defvar erc-server-ping-handler nil
 456   "This variable holds the periodic ping timer.")
 457 (make-variable-buffer-local 'erc-server-ping-handler)
 458
 459 ;;;; Helper functions
 460
 461 ;; From Circe
 462 (defun erc-split-line (longline)
 463   "Return a list of lines which are not too long for IRC.
 464 The length is specified in `erc-split-line-length'.
 465
 466 Currently this is called by `erc-send-input'."
 467   (if (< (length longline)
 468          erc-split-line-length)
 469       (list longline)
 470     (with-temp-buffer
 471       (insert longline)
 472       (let ((fill-column erc-split-line-length))
 473         (fill-region (point-min) (point-max)
 474                      nil t))
 475       (split-string (buffer-string) "\n"))))
 476
 477 ;; Used by CTCP functions
 478 (defun erc-upcase-first-word (str)
 479   "Upcase the first word in STR."
 480   (with-temp-buffer
 481     (insert str)
 482     (goto-char (point-min))
 483     (upcase-word 1)
 484     (buffer-string)))
 485
 486 (defun erc-server-setup-periodical-ping (buffer)
 487   "Set up a timer to periodically ping the current server.
 488 The current buffer is given by BUFFER."
 489   (with-current-buffer buffer
 490     (and erc-server-ping-handler (erc-cancel-timer erc-server-ping-handler))
 491     (when erc-server-send-ping-interval
 492       (setq erc-server-ping-handler (run-with-timer
 493                                      4 erc-server-send-ping-interval
 494                                      #'erc-server-send-ping
 495                                      buffer))
 496       (setq erc-server-ping-timer-alist (cons (cons buffer
 497                                                     erc-server-ping-handler)
 498                                               erc-server-ping-timer-alist)))))
 499
 500 (defun erc-server-process-alive (&optional buffer)
 501   "Return non-nil when BUFFER has an `erc-server-process' open or running."
 502   (with-current-buffer (or buffer (current-buffer))
 503     (and erc-server-process
 504          (processp erc-server-process)
 505          (memq (process-status erc-server-process) '(run open)))))
 506
 507 ;;;; Connecting to a server
 508
 509 (defun erc-server-connect (server port buffer)
 510   "Perform the connection and login using the specified SERVER and PORT.
 511 We will store server variables in the buffer given by BUFFER."
 512   (let ((msg (erc-format-message 'connect ?S server ?p port)))
 513     (message "%s" msg)
 514     (let ((process (funcall erc-server-connect-function
 515                             (format "erc-%s-%s" server port)
 516                             nil server port)))
 517       (unless (processp process)
 518         (error "Connection attempt failed"))
 519       (message "%s...done" msg)
 520       ;; Misc server variables
 521       (with-current-buffer buffer
 522         (setq erc-server-process process)
 523         (setq erc-server-quitting nil)
 524         (setq erc-server-reconnecting nil)
 525         (setq erc-server-timed-out nil)
 526         (setq erc-server-banned nil)
 527         (setq erc-server-error-occurred nil)
 528         (let ((time (erc-current-time)))
 529           (setq erc-server-last-sent-time time)
 530           (setq erc-server-last-ping-time time)
 531           (setq erc-server-last-received-time time))
 532         (setq erc-server-lines-sent 0)
 533         ;; last peers (sender and receiver)
 534         (setq erc-server-last-peers '(nil . nil)))
 535       ;; we do our own encoding and decoding
 536       (when (fboundp 'set-process-coding-system)
 537         (set-process-coding-system process 'raw-text))
 538       ;; process handlers
 539       (set-process-sentinel process 'erc-process-sentinel)
 540       (set-process-filter process 'erc-server-filter-function)
 541       (set-process-buffer process buffer)))
 542   (erc-log "\n\n\n********************************************\n")
 543   (message "%s" (erc-format-message
 544             'login ?n
 545             (with-current-buffer buffer (erc-current-nick))))
 546   ;; wait with script loading until we receive a confirmation (first
 547   ;; MOTD line)
 548   (if (eq erc-server-connect-function 'open-network-stream-nowait)
 549       ;; it's a bit unclear otherwise that it's attempting to establish a
 550       ;; connection
 551       (erc-display-message nil nil buffer "Opening connection..\n")
 552     (erc-login)))
 553
 554 (defun erc-server-reconnect ()
 555 "Reestablish the current IRC connection.
 556 Make sure you are in an ERC buffer when running this."
 557   (let ((buffer (erc-server-buffer)))
 558     (unless (buffer-live-p buffer)
 559       (if (eq major-mode 'erc-mode)
 560           (setq buffer (current-buffer))
 561         (error "Reconnect must be run from an ERC buffer")))
 562     (with-current-buffer buffer
 563       (erc-update-mode-line)
 564       (erc-set-active-buffer (current-buffer))
 565       (setq erc-server-last-sent-time 0)
 566       (setq erc-server-lines-sent 0)
 567       (let ((erc-server-connect-function (or erc-session-connector
 568                                              'open-network-stream)))
 569         (erc-open erc-session-server erc-session-port erc-server-current-nick
 570                   erc-session-user-full-name t erc-session-password)))))
 571
 572 (defun erc-server-filter-function (process string)
 573   "The process filter for the ERC server."
 574   (with-current-buffer (process-buffer process)
 575     (setq erc-server-last-received-time (erc-current-time))
 576     ;; If you think this is written in a weird way - please refer to the
 577     ;; docstring of `erc-server-processing-p'
 578     (if erc-server-processing-p
 579         (setq erc-server-filter-data
 580               (if erc-server-filter-data
 581                   (concat erc-server-filter-data string)
 582                 string))
 583       ;; This will be true even if another process is spawned!
 584       (let ((erc-server-processing-p t))
 585         (setq erc-server-filter-data (if erc-server-filter-data
 586                                            (concat erc-server-filter-data
 587                                                    string)
 588                                          string))
 589         (while (and erc-server-filter-data
 590                     (string-match "[\n\r]+" erc-server-filter-data))
 591           (let ((line (substring erc-server-filter-data
 592                                  0 (match-beginning 0))))
 593             (setq erc-server-filter-data
 594                   (if (= (match-end 0)
 595                          (length erc-server-filter-data))
 596                       nil
 597                     (substring erc-server-filter-data
 598                                (match-end 0))))
 599             (erc-log-irc-protocol line nil)
 600             (erc-parse-server-response process line)))))))
 601
 602 (defsubst erc-server-reconnect-p (event)
 603   "Return non-nil if ERC should attempt to reconnect automatically.
 604 EVENT is the message received from the closed connection process."
 605   (or erc-server-reconnecting
 606       (and erc-server-auto-reconnect
 607            (not erc-server-banned)
 608            (not erc-server-error-occurred)
 609            ;; make sure we don't infinitely try to reconnect, unless the
 610            ;; user wants that
 611            (or (eq erc-server-reconnect-attempts t)
 612                (and (integerp erc-server-reconnect-attempts)
 613                     (< erc-server-reconnect-count
 614                        erc-server-reconnect-attempts)))
 615            (or erc-server-timed-out
 616                (not (string-match "^deleted" event)))
 617            ;; open-network-stream-nowait error for connection refused
 618            (not (string-match "^failed with code 111" event)))))
 619
 620 (defun erc-process-sentinel-2 (event buffer)
 621   "Called when `erc-process-sentinel-1' has detected an unexpected disconnect."
 622   (if (not (buffer-live-p buffer))
 623       (erc-update-mode-line)
 624     (with-current-buffer buffer
 625       (let ((reconnect-p (erc-server-reconnect-p event)))
 626         (erc-display-message nil 'error (current-buffer)
 627                              (if reconnect-p 'disconnected
 628                                'disconnected-noreconnect))
 629         (if (not reconnect-p)
 630             ;; terminate, do not reconnect
 631             (progn
 632               (erc-display-message nil 'error (current-buffer)
 633                                    'terminated ?e event)
 634               ;; Update mode line indicators
 635               (erc-update-mode-line)
 636               (set-buffer-modified-p nil))
 637           ;; reconnect
 638           (condition-case err
 639               (progn
 640                 (setq erc-server-reconnecting nil)
 641                 (erc-server-reconnect)
 642                 (setq erc-server-reconnect-count 0))
 643             (error (when (buffer-live-p buffer)
 644                      (set-buffer buffer)
 645                      (if (integerp erc-server-reconnect-attempts)
 646                          (setq erc-server-reconnect-count
 647                                (1+ erc-server-reconnect-count))
 648                        (message "%s ... %s"
 649                                 "Reconnecting until we succeed"
 650                                 "kill the ERC server buffer to stop"))
 651                      (if (numberp erc-server-reconnect-timeout)
 652                          (run-at-time erc-server-reconnect-timeout nil
 653                                       #'erc-process-sentinel-2
 654                                       event buffer)
 655                        (error (concat "`erc-server-reconnect-timeout'"
 656                                       " must be a number")))))))))))
 657
 658 (defun erc-process-sentinel-1 (event buffer)
 659   "Called when `erc-process-sentinel' has decided that we're disconnecting.
 660 Determine whether user has quit or whether erc has been terminated.
 661 Conditionally try to reconnect and take appropriate action."
 662   (with-current-buffer buffer
 663     (if erc-server-quitting
 664         ;; normal quit
 665         (progn
 666           (erc-display-message nil 'error (current-buffer) 'finished)
 667           ;; Update mode line indicators
 668           (erc-update-mode-line)
 669           ;; Kill server buffer if user wants it
 670           (set-buffer-modified-p nil)
 671           (when erc-kill-server-buffer-on-quit
 672             (kill-buffer (current-buffer))))
 673       ;; unexpected disconnect
 674       (erc-process-sentinel-2 event buffer))))
 675
 676 (defun erc-process-sentinel (cproc event)
 677   "Sentinel function for ERC process."
 678   (let ((buf (process-buffer cproc)))
 679     (when (buffer-live-p buf)
 680       (with-current-buffer buf
 681         (erc-log (format
 682                   "SENTINEL: proc: %S    status: %S  event: %S (quitting: %S)"
 683                   cproc (process-status cproc) event erc-server-quitting))
 684         (if (string-match "^open" event)
 685             ;; newly opened connection (no wait)
 686             (erc-login)
 687           ;; assume event is 'failed
 688           (erc-with-all-buffers-of-server cproc nil
 689                                           (setq erc-server-connected nil))
 690           (when erc-server-ping-handler
 691             (progn (erc-cancel-timer erc-server-ping-handler)
 692                    (setq erc-server-ping-handler nil)))
 693           (run-hook-with-args 'erc-disconnected-hook
 694                               (erc-current-nick) (system-name) "")
 695           ;; Remove the prompt
 696           (goto-char (or (marker-position erc-input-marker) (point-max)))
 697           (forward-line 0)
 698           (erc-remove-text-properties-region (point) (point-max))
 699           (delete-region (point) (point-max))
 700           ;; Decide what to do with the buffer
 701           ;; Restart if disconnected
 702           (erc-process-sentinel-1 event buf))))))
 703
 704 ;;;; Sending messages
 705
 706 (defun erc-coding-system-for-target (target)
 707   "Return the coding system or cons cell appropriate for TARGET.
 708 This is determined via `erc-encoding-coding-alist' or
 709 `erc-server-coding-system'."
 710   (unless target (setq target (erc-default-target)))
 711   (or (when target
 712         (let ((case-fold-search t))
 713           (catch 'match
 714             (dolist (pat erc-encoding-coding-alist)
 715               (when (string-match (car pat) target)
 716                 (throw 'match (cdr pat)))))))
 717       (and (functionp erc-server-coding-system)
 718            (funcall erc-server-coding-system target))
 719       erc-server-coding-system))
 720
 721 (defun erc-decode-string-from-target (str target)
 722   "Decode STR as appropriate for TARGET.
 723 This is indicated by `erc-encoding-coding-alist', defaulting to the value of
 724 `erc-server-coding-system'."
 725   (unless (stringp str)
 726     (setq str ""))
 727   (let ((coding (erc-coding-system-for-target target)))
 728     (when (consp coding)
 729       (setq coding (cdr coding)))
 730     (when (eq coding 'undecided)
 731       (let ((codings (detect-coding-string str))
 732             (precedence erc-coding-system-precedence))
 733         (while (and precedence
 734                     (not (memq (car precedence) codings)))
 735           (pop precedence))
 736         (when precedence
 737           (setq coding (car precedence)))))
 738     (erc-decode-coding-string str coding)))
 739
 740 ;; proposed name, not used by anything yet
 741 (defun erc-send-line (text display-fn)
 742   "Send TEXT to the current server.  Wrapping and flood control apply.
 743 Use DISPLAY-FN to show the results."
 744   (mapc (lambda (line)
 745           (erc-server-send line)
 746           (funcall display-fn))
 747         (erc-split-line text)))
 748
 749 ;; From Circe, with modifications
 750 (defun erc-server-send (string &optional forcep target)
 751   "Send STRING to the current server.
 752 If FORCEP is non-nil, no flood protection is done - the string is
 753 sent directly. This might cause the messages to arrive in a wrong
 754 order.
 755
 756 If TARGET is specified, look up encoding information for that
 757 channel in `erc-encoding-coding-alist' or
 758 `erc-server-coding-system'.
 759
 760 See `erc-server-flood-margin' for an explanation of the flood
 761 protection algorithm."
 762   (erc-log (concat "erc-server-send: " string "(" (buffer-name) ")"))
 763   (setq erc-server-last-sent-time (erc-current-time))
 764   (let ((encoding (erc-coding-system-for-target target)))
 765     (when (consp encoding)
 766       (setq encoding (car encoding)))
 767     (if (erc-server-process-alive)
 768         (erc-with-server-buffer
 769           (let ((str (concat string "\r\n")))
 770             (if forcep
 771                 (progn
 772                   (setq erc-server-flood-last-message
 773                         (+ erc-server-flood-penalty
 774                            erc-server-flood-last-message))
 775                   (erc-log-irc-protocol str 'outbound)
 776                   (condition-case err
 777                       (progn
 778                         ;; Set encoding just before sending the string
 779                         (when (fboundp 'set-process-coding-system)
 780                           (set-process-coding-system erc-server-process
 781                                                      'raw-text encoding))
 782                         (process-send-string erc-server-process str))
 783                     ;; See `erc-server-send-queue' for full
 784                     ;; explanation of why we need this condition-case
 785                     (error nil)))
 786               (setq erc-server-flood-queue
 787                     (append erc-server-flood-queue
 788                             (list (cons str encoding))))
 789               (erc-server-send-queue (current-buffer))))
 790           t)
 791       (message "ERC: No process running")
 792       nil)))
 793
 794 (defun erc-server-send-ping (buf)
 795   "Send a ping to the IRC server buffer in BUF.
 796 Additionally, detect whether the IRC process has hung."
 797   (if (buffer-live-p buf)
 798       (with-current-buffer buf
 799         (if (and erc-server-send-ping-timeout
 800                  (>
 801                   (erc-time-diff (erc-current-time)
 802                                  erc-server-last-received-time)
 803                   erc-server-send-ping-timeout))
 804             (progn
 805               ;; if the process is hung, kill it
 806               (setq erc-server-timed-out t)
 807               (delete-process erc-server-process))
 808           (erc-server-send (format "PING %.0f" (erc-current-time)))))
 809     ;; remove timer if the server buffer has been killed
 810     (let ((timer (assq buf erc-server-ping-timer-alist)))
 811       (when timer
 812         (erc-cancel-timer (cdr timer))
 813         (setcdr timer nil)))))
 814
 815 ;; From Circe
 816 (defun erc-server-send-queue (buffer)
 817   "Send messages in `erc-server-flood-queue'.
 818 See `erc-server-flood-margin' for an explanation of the flood
 819 protection algorithm."
 820   (with-current-buffer buffer
 821     (let ((now (erc-current-time)))
 822       (when erc-server-flood-timer
 823         (erc-cancel-timer erc-server-flood-timer)
 824         (setq erc-server-flood-timer nil))
 825       (when (< erc-server-flood-last-message
 826                now)
 827         (setq erc-server-flood-last-message now))
 828       (while (and erc-server-flood-queue
 829                   (< erc-server-flood-last-message
 830                      (+ now erc-server-flood-margin)))
 831         (let ((msg (caar erc-server-flood-queue))
 832               (encoding (cdar erc-server-flood-queue)))
 833           (setq erc-server-flood-queue (cdr erc-server-flood-queue)
 834                 erc-server-flood-last-message
 835                 (+ erc-server-flood-last-message
 836                    erc-server-flood-penalty))
 837           (erc-log-irc-protocol msg 'outbound)
 838           (erc-log (concat "erc-server-send-queue: "
 839                            msg "(" (buffer-name buffer) ")"))
 840           (when (erc-server-process-alive)
 841             (condition-case err
 842                 ;; Set encoding just before sending the string
 843                 (progn
 844                   (when (fboundp 'set-process-coding-system)
 845                     (set-process-coding-system erc-server-process
 846                                                'raw-text encoding))
 847                   (process-send-string erc-server-process msg))
 848               ;; Sometimes the send can occur while the process is
 849               ;; being killed, which results in a weird SIGPIPE error.
 850               ;; Catch this and ignore it.
 851               (error nil)))))
 852       (when erc-server-flood-queue
 853         (setq erc-server-flood-timer
 854               (run-at-time (+ 0.2 erc-server-flood-penalty)
 855                            nil #'erc-server-send-queue buffer))))))
 856
 857 (defun erc-message (message-command line &optional force)
 858   "Send LINE to the server as a privmsg or a notice.
 859 MESSAGE-COMMAND should be either \"PRIVMSG\" or \"NOTICE\".
 860 If the target is \",\", the last person you've got a message from will
 861 be used. If the target is \".\", the last person you've sent a message
 862 to will be used."
 863   (cond
 864    ((string-match "^\\s-*\\(\\S-+\\) ?\\(.*\\)" line)
 865     (let ((tgt (match-string 1 line))
 866           (s (match-string 2 line)))
 867       (erc-log (format "cmd: MSG(%s): [%s] %s" message-command tgt s))
 868       (cond
 869        ((string= tgt ",")
 870         (if (car erc-server-last-peers)
 871             (setq tgt (car erc-server-last-peers))
 872           (setq tgt nil)))
 873        ((string= tgt ".")
 874         (if (cdr erc-server-last-peers)
 875             (setq tgt (cdr erc-server-last-peers))
 876           (setq tgt nil))))
 877       (cond
 878        (tgt
 879         (setcdr erc-server-last-peers tgt)
 880         (erc-server-send (format "%s %s :%s" message-command tgt s)
 881                          force))
 882        (t
 883         (erc-display-message nil 'error (current-buffer) 'no-target))))
 884     t)
 885    (t nil)))
 886
 887 ;;; CTCP
 888
 889 (defun erc-send-ctcp-message (tgt l &optional force)
 890   "Send CTCP message L to TGT.
 891
 892 If TGT is nil the message is not sent.
 893 The command must contain neither a prefix nor a trailing `\\n'.
 894
 895 See also `erc-server-send'."
 896   (let ((l (erc-upcase-first-word l)))
 897     (cond
 898      (tgt
 899       (erc-log (format "erc-send-CTCP-message: [%s] %s" tgt l))
 900       (erc-server-send (format "PRIVMSG %s :\C-a%s\C-a" tgt l)
 901                        force)))))
 902
 903 (defun erc-send-ctcp-notice (tgt l &optional force)
 904   "Send CTCP notice L to TGT.
 905
 906 If TGT is nil the message is not sent.
 907 The command must contain neither a prefix nor a trailing `\\n'.
 908
 909 See also `erc-server-send'."
 910   (let ((l (erc-upcase-first-word l)))
 911     (cond
 912      (tgt
 913       (erc-log (format "erc-send-CTCP-notice: [%s] %s" tgt l))
 914       (erc-server-send (format "NOTICE %s :\C-a%s\C-a" tgt l)
 915                        force)))))
 916
 917 ;;;; Handling responses
 918
 919 (defun erc-parse-server-response (proc string)
 920   "Parse and act upon a complete line from an IRC server.
 921 PROC is the process (connection) from which STRING was received.
 922 PROCs `process-buffer' is `current-buffer' when this function is called."
 923   (unless (string= string "") ;; Ignore empty strings
 924     (save-match-data
 925       (let ((posn (if (eq (aref string 0) ?:)
 926                       (string-match " " string)
 927                     0))
 928             (msg (make-erc-response :unparsed string)))
 929
 930         (setf (erc-response.sender msg)
 931               (if (eq posn 0)
 932                   erc-session-server
 933                 (substring string 1 posn)))
 934
 935         (setf (erc-response.command msg)
 936               (let* ((bposn (string-match "[^ \n]" string posn))
 937                      (eposn (string-match " " string bposn)))
 938                 (setq posn (and eposn
 939                                 (string-match "[^ \n]" string eposn)))
 940                 (substring string bposn eposn)))
 941
 942         (while (and posn
 943                     (not (eq (aref string posn) ?:)))
 944           (push (let* ((bposn posn)
 945                        (eposn (string-match " " string bposn)))
 946                   (setq posn (and eposn
 947                                   (string-match "[^ \n]" string eposn)))
 948                   (substring string bposn eposn))
 949                 (erc-response.command-args msg)))
 950         (when posn
 951       (let ((str (substring string (1+ posn))))
 952         (push str (erc-response.command-args msg))))
 953
 954     (setf (erc-response.contents msg)
 955           (car (erc-response.command-args msg)))
 956
 957     (setf (erc-response.command-args msg)
 958           (nreverse (erc-response.command-args msg)))
 959
 960     (erc-decode-parsed-server-response msg)
 961
 962     (erc-handle-parsed-server-response proc msg)))))
 963
 964 (defun erc-decode-parsed-server-response (parsed-response)
 965   "Decode a pre-parsed PARSED-RESPONSE before it can be handled.
 966
 967 If there is a channel name in `erc-response.command-args', decode
 968 `erc-response' according to this channel name and
 969 `erc-encoding-coding-alist', or use `erc-server-coding-system'
 970 for decoding."
 971   (let ((args (erc-response.command-args parsed-response))
 972         (decode-target nil)
 973         (decoded-args ()))
 974     (dolist (arg args nil)
 975       (when (string-match "^[#&].*" arg)
 976         (setq decode-target arg)))
 977     (when (stringp decode-target)
 978       (setq decode-target (erc-decode-string-from-target decode-target nil)))
 979     (setf (erc-response.unparsed parsed-response)
 980           (erc-decode-string-from-target
 981            (erc-response.unparsed parsed-response)
 982            decode-target))
 983     (setf (erc-response.sender parsed-response)
 984           (erc-decode-string-from-target
 985            (erc-response.sender parsed-response)
 986            decode-target))
 987     (setf (erc-response.command parsed-response)
 988           (erc-decode-string-from-target
 989            (erc-response.command parsed-response)
 990            decode-target))
 991     (dolist (arg (nreverse args) nil)
 992       (push (erc-decode-string-from-target arg decode-target)
 993             decoded-args))
 994     (setf (erc-response.command-args parsed-response) decoded-args)
 995     (setf (erc-response.contents parsed-response)
 996           (erc-decode-string-from-target
 997            (erc-response.contents parsed-response)
 998            decode-target))))
 999
1000 (defun erc-handle-parsed-server-response (process parsed-response)
1001   "Handle a pre-parsed PARSED-RESPONSE from PROCESS.
1002
1003 Hands off to helper functions via `erc-call-hooks'."
1004   (if (member (erc-response.command parsed-response)
1005               erc-server-prevent-duplicates)
1006       (let ((m (erc-response.unparsed parsed-response)))
1007         ;; duplicate suppression
1008         (if (< (or (gethash m erc-server-duplicates) 0)
1009                (- (erc-current-time) erc-server-duplicate-timeout))
1010             (erc-call-hooks process parsed-response))
1011         (puthash m (erc-current-time) erc-server-duplicates))
1012     ;; Hand off to the relevant handler.
1013     (erc-call-hooks process parsed-response)))
1014
1015 (defun erc-get-hook (command)
1016   "Return the hook variable associated with COMMAND.
1017
1018 See also `erc-server-responses'."
1019   (gethash (format (if (numberp command) "%03i" "%s") command)
1020            erc-server-responses))
1021
1022 (defun erc-call-hooks (process message)
1023   "Call hooks associated with MESSAGE in PROCESS.
1024
1025 Finds hooks by looking in the `erc-server-responses' hashtable."
1026   (let ((hook (or (erc-get-hook (erc-response.command message))
1027                   'erc-default-server-functions)))
1028     (run-hook-with-args-until-success hook process message)
1029     (erc-with-server-buffer
1030       (run-hook-with-args 'erc-timer-hook (erc-current-time)))))
1031
1032 (add-hook 'erc-default-server-functions 'erc-handle-unknown-server-response)
1033
1034 (defun erc-handle-unknown-server-response (proc parsed)
1035   "Display unknown server response's message."
1036   (let ((line (concat (erc-response.sender parsed)
1037                       " "
1038                       (erc-response.command parsed)
1039                       " "
1040                       (mapconcat 'identity (erc-response.command-args parsed)
1041                                  " "))))
1042     (erc-display-message parsed 'notice proc line)))
1043
1044
1045 (put 'define-erc-response-handler 'edebug-form-spec
1046      '(&define :name erc-response-handler
1047                (name &rest name)
1048                &optional sexp sexp def-body))
1049
1050 (cl-defmacro define-erc-response-handler ((name &rest aliases)
1051                                         &optional extra-fn-doc extra-var-doc
1052                                         &rest fn-body)
1053   "Define an ERC handler hook/function pair.
1054 NAME is the response name as sent by the server (see the IRC RFC for
1055 meanings).
1056
1057 This creates:
1058  - a hook variable `erc-server-NAME-functions' initialized to `erc-server-NAME'.
1059  - a function `erc-server-NAME' with body FN-BODY.
1060
1061 If ALIASES is non-nil, each alias in ALIASES is `defalias'ed to
1062 `erc-server-NAME'.
1063 Alias hook variables are created as `erc-server-ALIAS-functions' and
1064 initialized to the same default value as `erc-server-NAME-functions'.
1065
1066 FN-BODY is the body of `erc-server-NAME' it may refer to the two
1067 function arguments PROC and PARSED.
1068
1069 If EXTRA-FN-DOC is non-nil, it is inserted at the beginning of the
1070 defined function's docstring.
1071
1072 If EXTRA-VAR-DOC is non-nil, it is inserted at the beginning of the
1073 defined variable's docstring.
1074
1075 As an example:
1076
1077   (define-erc-response-handler (311 WHOIS WI)
1078     \"Some non-generic function documentation.\"
1079     \"Some non-generic variable documentation.\"
1080     (do-stuff-with-whois proc parsed))
1081
1082 Would expand to:
1083
1084   (prog2
1085       (defvar erc-server-311-functions 'erc-server-311
1086         \"Some non-generic variable documentation.
1087
1088   Hook called upon receiving a 311 server response.
1089   Each function is called with two arguments, the process associated
1090   with the response and the parsed response.
1091   See also `erc-server-311'.\")
1092
1093       (defun erc-server-311 (proc parsed)
1094         \"Some non-generic function documentation.
1095
1096   Handler for a 311 server response.
1097   PROC is the server process which returned the response.
1098   PARSED is the actual response as an `erc-response' struct.
1099   If you want to add responses don't modify this function, but rather
1100   add things to `erc-server-311-functions' instead.\"
1101         (do-stuff-with-whois proc parsed))
1102
1103     (puthash \"311\" 'erc-server-311-functions erc-server-responses)
1104     (puthash \"WHOIS\" 'erc-server-WHOIS-functions erc-server-responses)
1105     (puthash \"WI\" 'erc-server-WI-functions erc-server-responses)
1106
1107     (defalias 'erc-server-WHOIS 'erc-server-311)
1108     (defvar erc-server-WHOIS-functions 'erc-server-311
1109       \"Some non-generic variable documentation.
1110
1111   Hook called upon receiving a WHOIS server response.
1112
1113   Each function is called with two arguments, the process associated
1114   with the response and the parsed response.  If the function returns
1115   non-nil, stop processing the hook.  Otherwise, continue.
1116
1117   See also `erc-server-311'.\")
1118
1119     (defalias 'erc-server-WI 'erc-server-311)
1120     (defvar erc-server-WI-functions 'erc-server-311
1121       \"Some non-generic variable documentation.
1122
1123   Hook called upon receiving a WI server response.
1124   Each function is called with two arguments, the process associated
1125   with the response and the parsed response.  If the function returns
1126   non-nil, stop processing the hook.  Otherwise, continue.
1127
1128   See also `erc-server-311'.\"))
1129
1130 \(fn (NAME &rest ALIASES) &optional EXTRA-FN-DOC EXTRA-VAR-DOC &rest FN-BODY)"
1131   (if (numberp name) (setq name (intern (format "%03i" name))))
1132   (setq aliases (mapcar (lambda (a)
1133                           (if (numberp a)
1134                               (format "%03i" a)
1135                             a))
1136                         aliases))
1137   (let* ((hook-name (intern (format "erc-server-%s-functions" name)))
1138          (fn-name (intern (format "erc-server-%s" name)))
1139          (hook-doc (format "%sHook called upon receiving a %%s server response.
1140 Each function is called with two arguments, the process associated
1141 with the response and the parsed response.  If the function returns
1142 non-nil, stop processing the hook.  Otherwise, continue.
1143
1144 See also `%s'."
1145                            (if extra-var-doc
1146                                (concat extra-var-doc "\n\n")
1147                              "")
1148                            fn-name))
1149          (fn-doc (format "%sHandler for a %s server response.
1150 PROC is the server process which returned the response.
1151 PARSED is the actual response as an `erc-response' struct.
1152 If you want to add responses don't modify this function, but rather
1153 add things to `%s' instead."
1154                          (if extra-fn-doc
1155                              (concat extra-fn-doc "\n\n")
1156                            "")
1157                          name hook-name))
1158          (fn-alternates
1159           (cl-loop for alias in aliases
1160                    collect (intern (format "erc-server-%s" alias))))
1161          (var-alternates
1162           (cl-loop for alias in aliases
1163                    collect (intern (format "erc-server-%s-functions" alias)))))
1164     `(prog2
1165          ;; Normal hook variable.  The variable may already have a
1166          ;; value at this point, so I default to nil, and (add-hook)
1167          ;; unconditionally
1168          (defvar ,hook-name nil ,(format hook-doc name))
1169          (add-to-list ',hook-name ',fn-name)
1170          ;; Handler function
1171          (defun ,fn-name (proc parsed)
1172            ,fn-doc
1173            ,@fn-body)
1174
1175        ;; Make find-function and find-variable find them
1176        (put ',fn-name 'definition-name ',name)
1177        (put ',hook-name 'definition-name ',name)
1178
1179        ;; Hashtable map of responses to hook variables
1180        ,@(cl-loop for response in (cons name aliases)
1181                   for var in (cons hook-name var-alternates)
1182                   collect `(puthash ,(format "%s" response) ',var
1183                                     erc-server-responses))
1184        ;; Alternates.
1185        ;; Functions are defaliased, hook variables are defvared so we
1186        ;; can add hooks to one alias, but not another.
1187        ,@(cl-loop for fn in fn-alternates
1188                   for var in var-alternates
1189                   for a in aliases
1190                   nconc (list `(defalias ',fn ',fn-name)
1191                               `(defvar ,var ',fn-name ,(format hook-doc a))
1192                               `(put ',var 'definition-name ',hook-name))))))
1193
1194 (define-erc-response-handler (ERROR)
1195   "Handle an ERROR command from the server." nil
1196   (setq erc-server-error-occurred t)
1197   (erc-display-message
1198    parsed 'error nil 'ERROR
1199    ?s (erc-response.sender parsed) ?c (erc-response.contents parsed)))
1200
1201 (define-erc-response-handler (INVITE)
1202   "Handle invitation messages."
1203   nil
1204   (let ((target (car (erc-response.command-args parsed)))
1205         (chnl (erc-response.contents parsed)))
1206     (pcase-let ((`(,nick ,login ,host)
1207                  (erc-parse-user (erc-response.sender parsed))))
1208       (setq erc-invitation chnl)
1209       (when (string= target (erc-current-nick))
1210         (erc-display-message
1211          parsed 'notice 'active
1212          'INVITE ?n nick ?u login ?h host ?c chnl)))))
1213
1214 (define-erc-response-handler (JOIN)
1215   "Handle join messages."
1216   nil
1217   (let ((chnl (erc-response.contents parsed))
1218         (buffer nil))
1219     (pcase-let ((`(,nick ,login ,host)
1220                  (erc-parse-user (erc-response.sender parsed))))
1221       ;; strip the stupid combined JOIN facility (IRC 2.9)
1222       (if (string-match "^\\(.*\\)?\^g.*$" chnl)
1223           (setq chnl (match-string 1 chnl)))
1224       (save-excursion
1225         (let* ((str (cond
1226                      ;; If I have joined a channel
1227                      ((erc-current-nick-p nick)
1228                       (setq buffer (erc-open erc-session-server erc-session-port
1229                                              nick erc-session-user-full-name
1230                                              nil nil
1231                                              (list chnl) chnl
1232                                              erc-server-process))
1233                       (when buffer
1234                         (set-buffer buffer)
1235                         (erc-add-default-channel chnl)
1236                         (erc-server-send (format "MODE %s" chnl)))
1237                       (erc-with-buffer (chnl proc)
1238                         (erc-channel-begin-receiving-names))
1239                       (erc-update-mode-line)
1240                       (run-hooks 'erc-join-hook)
1241                       (erc-make-notice
1242                        (erc-format-message 'JOIN-you ?c chnl)))
1243                      (t
1244                       (setq buffer (erc-get-buffer chnl proc))
1245                       (erc-make-notice
1246                        (erc-format-message
1247                         'JOIN ?n nick ?u login ?h host ?c chnl))))))
1248           (when buffer (set-buffer buffer))
1249           (erc-update-channel-member chnl nick nick t nil nil nil nil nil host login)
1250           ;; on join, we want to stay in the new channel buffer
1251           ;;(set-buffer ob)
1252           (erc-display-message parsed nil buffer str))))))
1253
1254 (define-erc-response-handler (KICK)
1255   "Handle kick messages received from the server." nil
1256   (let* ((ch (nth 0 (erc-response.command-args parsed)))
1257          (tgt (nth 1 (erc-response.command-args parsed)))
1258          (reason (erc-trim-string (erc-response.contents parsed)))
1259          (buffer (erc-get-buffer ch proc)))
1260     (pcase-let ((`(,nick ,login ,host)
1261                  (erc-parse-user (erc-response.sender parsed))))
1262       (erc-remove-channel-member buffer tgt)
1263       (cond
1264        ((string= tgt (erc-current-nick))
1265         (erc-display-message
1266          parsed 'notice buffer
1267          'KICK-you ?n nick ?u login ?h host ?c ch ?r reason)
1268         (run-hook-with-args 'erc-kick-hook buffer)
1269         (erc-with-buffer
1270             (buffer)
1271           (erc-remove-channel-users))
1272         (erc-delete-default-channel ch buffer)
1273         (erc-update-mode-line buffer))
1274        ((string= nick (erc-current-nick))
1275         (erc-display-message
1276          parsed 'notice buffer
1277          'KICK-by-you ?k tgt ?c ch ?r reason))
1278        (t (erc-display-message
1279              parsed 'notice buffer
1280              'KICK ?k tgt ?n nick ?u login ?h host ?c ch ?r reason))))))
1281
1282 (define-erc-response-handler (MODE)
1283   "Handle server mode changes." nil
1284   (let ((tgt (car (erc-response.command-args parsed)))
1285         (mode (mapconcat 'identity (cdr (erc-response.command-args parsed))
1286                          " ")))
1287     (pcase-let ((`(,nick ,login ,host)
1288                  (erc-parse-user (erc-response.sender parsed))))
1289       (erc-log (format "MODE: %s -> %s: %s" nick tgt mode))
1290       ;; dirty hack
1291       (let ((buf (cond ((erc-channel-p tgt)
1292                         (erc-get-buffer tgt proc))
1293                        ((string= tgt (erc-current-nick)) nil)
1294                        ((erc-active-buffer) (erc-active-buffer))
1295                        (t (erc-get-buffer tgt)))))
1296         (with-current-buffer (or buf
1297                                  (current-buffer))
1298           (erc-update-modes tgt mode nick host login))
1299           (if (or (string= login "") (string= host ""))
1300               (erc-display-message parsed 'notice buf
1301                                    'MODE-nick ?n nick
1302                                    ?t tgt ?m mode)
1303             (erc-display-message parsed 'notice buf
1304                                  'MODE ?n nick ?u login
1305                                  ?h host ?t tgt ?m mode)))
1306       (erc-banlist-update proc parsed))))
1307
1308 (define-erc-response-handler (NICK)
1309   "Handle nick change messages." nil
1310   (let ((nn (erc-response.contents parsed))
1311         bufs)
1312     (pcase-let ((`(,nick ,login ,host)
1313                  (erc-parse-user (erc-response.sender parsed))))
1314       (setq bufs (erc-buffer-list-with-nick nick proc))
1315       (erc-log (format "NICK: %s -> %s" nick nn))
1316       ;; if we had a query with this user, make sure future messages will be
1317       ;; sent to the correct nick. also add to bufs, since the user will want
1318       ;; to see the nick change in the query, and if it's a newly begun query,
1319       ;; erc-channel-users won't contain it
1320       (erc-buffer-filter
1321        (lambda ()
1322          (when (equal (erc-default-target) nick)
1323            (setq erc-default-recipients
1324                  (cons nn (cdr erc-default-recipients)))
1325            (rename-buffer nn t)         ; bug#12002
1326            (erc-update-mode-line)
1327            (add-to-list 'bufs (current-buffer)))))
1328       (erc-update-user-nick nick nn host nil nil login)
1329       (cond
1330        ((string= nick (erc-current-nick))
1331         (add-to-list 'bufs (erc-server-buffer))
1332         (erc-set-current-nick nn)
1333         (erc-update-mode-line)
1334         (setq erc-nick-change-attempt-count 0)
1335         (setq erc-default-nicks (if (consp erc-nick) erc-nick (list erc-nick)))
1336         (erc-display-message
1337          parsed 'notice bufs
1338          'NICK-you ?n nick ?N nn)
1339         (run-hook-with-args 'erc-nick-changed-functions nn nick))
1340        (t
1341         (erc-handle-user-status-change 'nick (list nick login host) (list nn))
1342         (erc-display-message parsed 'notice bufs 'NICK ?n nick
1343                              ?u login ?h host ?N nn))))))
1344
1345 (define-erc-response-handler (PART)
1346   "Handle part messages." nil
1347   (let* ((chnl (car (erc-response.command-args parsed)))
1348          (reason (erc-trim-string (erc-response.contents parsed)))
1349          (buffer (erc-get-buffer chnl proc)))
1350     (pcase-let ((`(,nick ,login ,host)
1351                  (erc-parse-user (erc-response.sender parsed))))
1352       (erc-remove-channel-member buffer nick)
1353       (erc-display-message parsed 'notice buffer
1354                            'PART ?n nick ?u login
1355                            ?h host ?c chnl ?r (or reason ""))
1356       (when (string= nick (erc-current-nick))
1357         (run-hook-with-args 'erc-part-hook buffer)
1358         (erc-with-buffer
1359             (buffer)
1360           (erc-remove-channel-users))
1361         (erc-delete-default-channel chnl buffer)
1362         (erc-update-mode-line buffer)
1363         (when erc-kill-buffer-on-part
1364           (kill-buffer buffer))))))
1365
1366 (define-erc-response-handler (PING)
1367   "Handle ping messages." nil
1368   (let ((pinger (car (erc-response.command-args parsed))))
1369     (erc-log (format "PING: %s" pinger))
1370     ;; ping response to the server MUST be forced, or you can lose big
1371     (erc-server-send (format "PONG :%s" pinger) t)
1372     (when erc-verbose-server-ping
1373       (erc-display-message
1374        parsed 'error proc
1375        'PING ?s (erc-time-diff erc-server-last-ping-time (erc-current-time))))
1376     (setq erc-server-last-ping-time (erc-current-time))))
1377
1378 (define-erc-response-handler (PONG)
1379   "Handle pong messages." nil
1380   (let ((time (string-to-number (erc-response.contents parsed))))
1381     (when (> time 0)
1382       (setq erc-server-lag (erc-time-diff time (erc-current-time)))
1383       (when erc-verbose-server-ping
1384         (erc-display-message
1385          parsed 'notice proc 'PONG
1386          ?h (car (erc-response.command-args parsed)) ?i erc-server-lag
1387          ?s (if (/= erc-server-lag 1) "s" "")))
1388       (erc-update-mode-line))))
1389
1390 (define-erc-response-handler (PRIVMSG NOTICE)
1391   "Handle private messages, including messages in channels." nil
1392   (let ((sender-spec (erc-response.sender parsed))
1393         (cmd (erc-response.command parsed))
1394         (tgt (car (erc-response.command-args parsed)))
1395         (msg (erc-response.contents parsed)))
1396     (if (or (erc-ignored-user-p sender-spec)
1397             (erc-ignored-reply-p msg tgt proc))
1398         (when erc-minibuffer-ignored
1399           (message "Ignored %s from %s to %s" cmd sender-spec tgt))
1400       (let* ((sndr (erc-parse-user sender-spec))
1401              (nick (nth 0 sndr))
1402              (login (nth 1 sndr))
1403              (host (nth 2 sndr))
1404              (msgp (string= cmd "PRIVMSG"))
1405              (noticep (string= cmd "NOTICE"))
1406              ;; S.B. downcase *both* tgt and current nick
1407              (privp (erc-current-nick-p tgt))
1408              s buffer
1409              fnick)
1410         (setf (erc-response.contents parsed) msg)
1411         (setq buffer (erc-get-buffer (if privp nick tgt) proc))
1412         (when buffer
1413           (with-current-buffer buffer
1414             ;; update the chat partner info.  Add to the list if private
1415             ;; message.  We will accumulate private identities indefinitely
1416             ;; at this point.
1417             (erc-update-channel-member (if privp nick tgt) nick nick
1418                                        privp nil nil nil nil nil host login nil nil t)
1419             (let ((cdata (erc-get-channel-user nick)))
1420               (setq fnick (funcall erc-format-nick-function
1421                                    (car cdata) (cdr cdata))))))
1422         (cond
1423          ((erc-is-message-ctcp-p msg)
1424           (setq s (if msgp
1425                       (erc-process-ctcp-query proc parsed nick login host)
1426                     (erc-process-ctcp-reply proc parsed nick login host
1427                                             (match-string 1 msg)))))
1428          (t
1429           (setcar erc-server-last-peers nick)
1430           (setq s (erc-format-privmessage
1431                    (or fnick nick) msg
1432                    ;; If buffer is a query buffer,
1433                    ;; format the nick as for a channel.
1434                    (and (not (and buffer
1435                                   (erc-query-buffer-p buffer)
1436                                   erc-format-query-as-channel-p))
1437                         privp)
1438                    msgp))))
1439         (when s
1440           (if (and noticep privp)
1441               (progn
1442                 (run-hook-with-args 'erc-echo-notice-always-hook
1443                                     s parsed buffer nick)
1444                 (run-hook-with-args-until-success
1445                  'erc-echo-notice-hook s parsed buffer nick))
1446             (erc-display-message parsed nil buffer s)))
1447         (when (string= cmd "PRIVMSG")
1448           (erc-auto-query proc parsed))))))
1449
1450 ;; FIXME: need clean way of specifying extra hooks in
1451 ;; define-erc-response-handler.
1452 (add-hook 'erc-server-PRIVMSG-functions 'erc-auto-query)
1453
1454 (define-erc-response-handler (QUIT)
1455   "Another user has quit IRC." nil
1456   (let ((reason (erc-response.contents parsed))
1457         bufs)
1458     (pcase-let ((`(,nick ,login ,host)
1459                  (erc-parse-user (erc-response.sender parsed))))
1460       (setq bufs (erc-buffer-list-with-nick nick proc))
1461       (erc-remove-user nick)
1462       (setq reason (erc-wash-quit-reason reason nick login host))
1463       (erc-display-message parsed 'notice bufs
1464                            'QUIT ?n nick ?u login
1465                            ?h host ?r reason))))
1466
1467 (define-erc-response-handler (TOPIC)
1468   "The channel topic has changed." nil
1469   (let* ((ch (car (erc-response.command-args parsed)))
1470          (topic (erc-trim-string (erc-response.contents parsed)))
1471          (time (format-time-string erc-server-timestamp-format)))
1472     (pcase-let ((`(,nick ,login ,host)
1473                  (erc-parse-user (erc-response.sender parsed))))
1474       (erc-update-channel-member ch nick nick nil nil nil nil nil nil host login)
1475       (erc-update-channel-topic ch (format "%s\C-o (%s, %s)" topic nick time))
1476       (erc-display-message parsed 'notice (erc-get-buffer ch proc)
1477                            'TOPIC ?n nick ?u login ?h host
1478                            ?c ch ?T topic))))
1479
1480 (define-erc-response-handler (WALLOPS)
1481   "Display a WALLOPS message." nil
1482   (let ((message (erc-response.contents parsed)))
1483     (pcase-let ((`(,nick ,login ,host)
1484                  (erc-parse-user (erc-response.sender parsed))))
1485       (erc-display-message
1486        parsed 'notice nil
1487        'WALLOPS ?n nick ?m message))))
1488
1489 (define-erc-response-handler (001)
1490   "Set `erc-server-current-nick' to reflect server settings and display the welcome message."
1491   nil
1492   (erc-set-current-nick (car (erc-response.command-args parsed)))
1493   (erc-update-mode-line)                ; needed here?
1494   (setq erc-nick-change-attempt-count 0)
1495   (setq erc-default-nicks (if (consp erc-nick) erc-nick (list erc-nick)))
1496   (erc-display-message
1497    parsed 'notice 'active (erc-response.contents parsed)))
1498
1499 (define-erc-response-handler (MOTD 002 003 371 372 374 375)
1500   "Display the server's message of the day." nil
1501   (erc-handle-login)
1502   (erc-display-message
1503    parsed 'notice (if erc-server-connected 'active proc)
1504    (erc-response.contents parsed)))
1505
1506 (define-erc-response-handler (376 422)
1507   "End of MOTD/MOTD is missing." nil
1508   (erc-server-MOTD proc parsed)
1509   (erc-connection-established proc parsed))
1510
1511 (define-erc-response-handler (004)
1512   "Display the server's identification." nil
1513   (pcase-let ((`(,server-name ,server-version)
1514                (cdr (erc-response.command-args parsed))))
1515     (setq erc-server-version server-version)
1516     (setq erc-server-announced-name server-name)
1517     (erc-update-mode-line-buffer (process-buffer proc))
1518     (erc-display-message
1519      parsed 'notice proc
1520      's004 ?s server-name ?v server-version
1521      ?U (nth 3 (erc-response.command-args parsed))
1522      ?C (nth 4 (erc-response.command-args parsed)))))
1523
1524 (define-erc-response-handler (005)
1525   "Set the variable `erc-server-parameters' and display the received message.
1526
1527 According to RFC 2812, suggests alternate servers on the network.
1528 Many servers, however, use this code to show which parameters they have set,
1529 for example, the network identifier, maximum allowed topic length, whether
1530 certain commands are accepted and more.  See documentation for
1531 `erc-server-parameters' for more information on the parameters sent.
1532
1533 A server may send more than one 005 message."
1534   nil
1535   (let ((line (mapconcat 'identity
1536                          (setf (erc-response.command-args parsed)
1537                                (cdr (erc-response.command-args parsed)))
1538                          " ")))
1539     (while (erc-response.command-args parsed)
1540       (let ((section (pop (erc-response.command-args parsed))))
1541         ;; fill erc-server-parameters
1542         (when (string-match "^\\([A-Z]+\\)\=\\(.*\\)$\\|^\\([A-Z]+\\)$"
1543                             section)
1544           (add-to-list 'erc-server-parameters
1545                        `(,(or (match-string 1 section)
1546                               (match-string 3 section))
1547                          .
1548                          ,(match-string 2 section))))))
1549     (erc-display-message parsed 'notice proc line)))
1550
1551 (define-erc-response-handler (221)
1552   "Display the current user modes." nil
1553   (let* ((nick (car (erc-response.command-args parsed)))
1554          (modes (mapconcat 'identity
1555                            (cdr (erc-response.command-args parsed)) " ")))
1556     (erc-set-modes nick modes)
1557     (erc-display-message parsed 'notice 'active 's221 ?n nick ?m modes)))
1558
1559 (define-erc-response-handler (252)
1560   "Display the number of IRC operators online." nil
1561   (erc-display-message parsed 'notice 'active 's252
1562                        ?i (cadr (erc-response.command-args parsed))))
1563
1564 (define-erc-response-handler (253)
1565   "Display the number of unknown connections." nil
1566   (erc-display-message parsed 'notice 'active 's253
1567                        ?i (cadr (erc-response.command-args parsed))))
1568
1569 (define-erc-response-handler (254)
1570   "Display the number of channels formed." nil
1571   (erc-display-message parsed 'notice 'active 's254
1572                        ?i (cadr (erc-response.command-args parsed))))
1573
1574 (define-erc-response-handler (250 251 255 256 257 258 259 265 266 377 378)
1575   "Generic display of server messages as notices.
1576
1577 See `erc-display-server-message'." nil
1578   (erc-display-server-message proc parsed))
1579
1580 (define-erc-response-handler (275)
1581   "Display secure connection message." nil
1582   (pcase-let ((`(,nick ,user ,message)
1583                (cdr (erc-response.command-args parsed))))
1584     (erc-display-message
1585      parsed 'notice 'active 's275
1586      ?n nick
1587      ?m (mapconcat 'identity (cddr (erc-response.command-args parsed))
1588                    " "))))
1589
1590 (define-erc-response-handler (290)
1591   "Handle dancer-ircd CAPAB messages." nil nil)
1592
1593 (define-erc-response-handler (301)
1594   "AWAY notice." nil
1595   (erc-display-message parsed 'notice 'active 's301
1596                        ?n (cadr (erc-response.command-args parsed))
1597                        ?r (erc-response.contents parsed)))
1598
1599 (define-erc-response-handler (303)
1600   "ISON reply" nil
1601   (erc-display-message parsed 'notice 'active 's303
1602                        ?n (cadr (erc-response.command-args parsed))))
1603
1604 (define-erc-response-handler (305)
1605   "Return from AWAYness." nil
1606   (erc-process-away proc nil)
1607   (erc-display-message parsed 'notice 'active
1608                        's305 ?m (erc-response.contents parsed)))
1609
1610 (define-erc-response-handler (306)
1611   "Set AWAYness." nil
1612   (erc-process-away proc t)
1613   (erc-display-message parsed 'notice 'active
1614                        's306 ?m (erc-response.contents parsed)))
1615
1616 (define-erc-response-handler (307)
1617   "Display nick-identified message." nil
1618   (pcase-let ((`(,nick ,user ,message)
1619                (cdr (erc-response.command-args parsed))))
1620     (erc-display-message
1621      parsed 'notice 'active 's307
1622      ?n nick
1623      ?m (mapconcat 'identity (cddr (erc-response.command-args parsed))
1624                    " "))))
1625
1626 (define-erc-response-handler (311 314)
1627   "WHOIS/WHOWAS notices." nil
1628   (let ((fname (erc-response.contents parsed))
1629         (catalog-entry (intern (format "s%s" (erc-response.command parsed)))))
1630     (pcase-let ((`(,nick ,user ,host)
1631                  (cdr (erc-response.command-args parsed))))
1632       (erc-update-user-nick nick nick host nil fname user)
1633       (erc-display-message
1634        parsed 'notice 'active catalog-entry
1635        ?n nick ?f fname ?u user ?h host))))
1636
1637 (define-erc-response-handler (312)
1638   "Server name response in WHOIS." nil
1639   (pcase-let ((`(,nick ,server-host)
1640               (cdr (erc-response.command-args parsed))))
1641     (erc-display-message
1642      parsed 'notice 'active 's312
1643      ?n nick ?s server-host ?c (erc-response.contents parsed))))
1644
1645 (define-erc-response-handler (313)
1646   "IRC Operator response in WHOIS." nil
1647   (erc-display-message
1648    parsed 'notice 'active 's313
1649    ?n (cadr (erc-response.command-args parsed))))
1650
1651 (define-erc-response-handler (315 318 323 369)
1652   ;; 315 - End of WHO
1653   ;; 318 - End of WHOIS list
1654   ;; 323 - End of channel LIST
1655   ;; 369 - End of WHOWAS
1656   "End of WHO/WHOIS/LIST/WHOWAS notices." nil
1657   (ignore proc parsed))
1658
1659 (define-erc-response-handler (317)
1660   "IDLE notice." nil
1661   (pcase-let ((`(,nick ,seconds-idle ,on-since ,time)
1662                (cdr (erc-response.command-args parsed))))
1663     (setq time (when on-since
1664                  (format-time-string erc-server-timestamp-format
1665                                      (erc-string-to-emacs-time on-since))))
1666     (erc-update-user-nick nick nick nil nil nil
1667                           (and time (format "on since %s" time)))
1668     (if time
1669         (erc-display-message
1670          parsed 'notice 'active 's317-on-since
1671          ?n nick ?i (erc-sec-to-time (string-to-number seconds-idle)) ?t time)
1672       (erc-display-message
1673        parsed 'notice 'active 's317
1674        ?n nick ?i (erc-sec-to-time (string-to-number seconds-idle))))))
1675
1676 (define-erc-response-handler (319)
1677   "Channel names in WHOIS response." nil
1678   (erc-display-message
1679    parsed 'notice 'active 's319
1680    ?n (cadr (erc-response.command-args parsed))
1681    ?c (erc-response.contents parsed)))
1682
1683 (define-erc-response-handler (320)
1684   "Identified user in WHOIS." nil
1685   (erc-display-message
1686    parsed 'notice 'active 's320
1687    ?n (cadr (erc-response.command-args parsed))))
1688
1689 (define-erc-response-handler (321)
1690   "LIST header." nil
1691   (setq erc-channel-list nil))
1692
1693 (defun erc-server-321-message (proc parsed)
1694   "Display a message for the 321 event."
1695   (erc-display-message parsed 'notice proc 's321)
1696   nil)
1697 (add-hook 'erc-server-321-functions 'erc-server-321-message t)
1698
1699 (define-erc-response-handler (322)
1700   "LIST notice." nil
1701   (let ((topic (erc-response.contents parsed)))
1702     (pcase-let ((`(,channel ,num-users)
1703                  (cdr (erc-response.command-args parsed))))
1704       (add-to-list 'erc-channel-list (list channel))
1705       (erc-update-channel-topic channel topic))))
1706
1707 (defun erc-server-322-message (proc parsed)
1708   "Display a message for the 322 event."
1709   (let ((topic (erc-response.contents parsed)))
1710     (pcase-let ((`(,channel ,num-users)
1711                  (cdr (erc-response.command-args parsed))))
1712       (erc-display-message
1713        parsed 'notice proc 's322
1714        ?c channel ?u num-users ?t (or topic "")))))
1715 (add-hook 'erc-server-322-functions 'erc-server-322-message t)
1716
1717 (define-erc-response-handler (324)
1718   "Channel or nick modes." nil
1719   (let ((channel (cadr (erc-response.command-args parsed)))
1720         (modes (mapconcat 'identity (cddr (erc-response.command-args parsed))
1721                           " ")))
1722     (erc-set-modes channel modes)
1723     (erc-display-message
1724      parsed 'notice (erc-get-buffer channel proc)
1725      's324 ?c channel ?m modes)))
1726
1727 (define-erc-response-handler (328)
1728   "Channel URL (on freenode network)." nil
1729   (let ((channel (cadr (erc-response.command-args parsed)))
1730         (url (erc-response.contents parsed)))
1731     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1732                          's328 ?c channel ?u url)))
1733
1734 (define-erc-response-handler (329)
1735   "Channel creation date." nil
1736   (let ((channel (cadr (erc-response.command-args parsed)))
1737         (time (erc-string-to-emacs-time
1738                (nth 2 (erc-response.command-args parsed)))))
1739     (erc-display-message
1740      parsed 'notice (erc-get-buffer channel proc)
1741      's329 ?c channel ?t (format-time-string erc-server-timestamp-format
1742                                              time))))
1743
1744 (define-erc-response-handler (330)
1745   "Nick is authed as (on Quakenet network)." nil
1746   ;; FIXME: I don't know what the magic numbers mean.  Mummy, make
1747   ;; the magic numbers go away.
1748   ;; No seriously, I have no clue about the format of this command,
1749   ;; and don't sit on Quakenet, so can't test.  Originally we had:
1750   ;; nick == (aref parsed 3)
1751   ;; authaccount == (aref parsed 4)
1752   ;; authmsg == (aref parsed 5)
1753   ;; The guesses below are, well, just that. -- Lawrence 2004/05/10
1754   (let ((nick (cadr (erc-response.command-args parsed)))
1755         (authaccount (nth 2 (erc-response.command-args parsed)))
1756         (authmsg (erc-response.contents parsed)))
1757     (erc-display-message parsed 'notice 'active 's330
1758                          ?n nick ?a authmsg ?i authaccount)))
1759
1760 (define-erc-response-handler (331)
1761   "No topic set for channel." nil
1762   (let ((channel (cadr (erc-response.command-args parsed)))
1763         (topic (erc-response.contents parsed)))
1764     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1765                          's331 ?c channel)))
1766
1767 (define-erc-response-handler (332)
1768   "TOPIC notice." nil
1769   (let ((channel (cadr (erc-response.command-args parsed)))
1770         (topic (erc-response.contents parsed)))
1771     (erc-update-channel-topic channel topic)
1772     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1773                          's332 ?c channel ?T topic)))
1774
1775 (define-erc-response-handler (333)
1776   "Who set the topic, and when." nil
1777   (pcase-let ((`(,channel ,nick ,time)
1778                (cdr (erc-response.command-args parsed))))
1779     (setq time (format-time-string erc-server-timestamp-format
1780                                    (erc-string-to-emacs-time time)))
1781     (erc-update-channel-topic channel
1782                               (format "\C-o (%s, %s)" nick time)
1783                               'append)
1784     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1785                          's333 ?c channel ?n nick ?t time)))
1786
1787 (define-erc-response-handler (341)
1788   "Let user know when an INVITE attempt has been sent successfully."
1789   nil
1790   (pcase-let ((`(,nick ,channel)
1791                (cdr (erc-response.command-args parsed))))
1792     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1793                          's341 ?n nick ?c channel)))
1794
1795 (define-erc-response-handler (352)
1796   "WHO notice." nil
1797   (pcase-let ((`(,channel ,user ,host ,server ,nick ,away-flag)
1798                (cdr (erc-response.command-args parsed))))
1799     (let ((full-name (erc-response.contents parsed))
1800           hopcount)
1801       (when (string-match "\\(^[0-9]+ \\)\\(.*\\)$" full-name)
1802         (setq hopcount (match-string 1 full-name))
1803         (setq full-name (match-string 2 full-name)))
1804       (erc-update-channel-member channel nick nick nil nil nil nil nil nil host user full-name)
1805       (erc-display-message parsed 'notice 'active 's352
1806                            ?c channel ?n nick ?a away-flag
1807                            ?u user ?h host ?f full-name))))
1808
1809 (define-erc-response-handler (353)
1810   "NAMES notice." nil
1811   (let ((channel (nth 2 (erc-response.command-args parsed)))
1812         (users (erc-response.contents parsed)))
1813     (erc-display-message parsed 'notice (or (erc-get-buffer channel proc)
1814                                             'active)
1815                          's353 ?c channel ?u users)
1816     (erc-with-buffer (channel proc)
1817       (erc-channel-receive-names users))))
1818
1819 (define-erc-response-handler (366)
1820   "End of NAMES." nil
1821   (erc-with-buffer ((cadr (erc-response.command-args parsed)) proc)
1822     (erc-channel-end-receiving-names)))
1823
1824 (define-erc-response-handler (367)
1825   "Channel ban list entries." nil
1826   (pcase-let ((`(,channel ,banmask ,setter ,time)
1827                (cdr (erc-response.command-args parsed))))
1828     ;; setter and time are not standard
1829     (if setter
1830         (erc-display-message parsed 'notice 'active 's367-set-by
1831                              ?c channel
1832                              ?b banmask
1833                              ?s setter
1834                              ?t (or time ""))
1835       (erc-display-message parsed 'notice 'active 's367
1836                            ?c channel
1837                            ?b banmask))))
1838
1839 (define-erc-response-handler (368)
1840   "End of channel ban list." nil
1841   (let ((channel (cadr (erc-response.command-args parsed))))
1842     (erc-display-message parsed 'notice 'active 's368
1843                          ?c channel)))
1844
1845 (define-erc-response-handler (379)
1846   "Forwarding to another channel." nil
1847   ;; FIXME: Yet more magic numbers in original code, I'm guessing this
1848   ;; command takes two arguments, and doesn't have any "contents". --
1849   ;; Lawrence 2004/05/10
1850   (pcase-let ((`(,from ,to)
1851                (cdr (erc-response.command-args parsed))))
1852     (erc-display-message parsed 'notice 'active
1853                          's379 ?c from ?f to)))
1854
1855 (define-erc-response-handler (391)
1856   "Server's time string." nil
1857   (erc-display-message
1858    parsed 'notice 'active
1859    's391 ?s (cadr (erc-response.command-args parsed))
1860    ?t (nth 2 (erc-response.command-args parsed))))
1861
1862 (define-erc-response-handler (401)
1863   "No such nick/channel." nil
1864   (let ((nick/channel (cadr (erc-response.command-args parsed))))
1865     (when erc-whowas-on-nosuchnick
1866       (erc-log (format "cmd: WHOWAS: %s" nick/channel))
1867       (erc-server-send (format "WHOWAS %s 1" nick/channel)))
1868     (erc-display-message parsed '(notice error) 'active
1869                          's401 ?n nick/channel)))
1870
1871 (define-erc-response-handler (403)
1872   "No such channel." nil
1873   (erc-display-message parsed '(notice error) 'active
1874                        's403 ?c (cadr (erc-response.command-args parsed))))
1875
1876 (define-erc-response-handler (404)
1877   "Cannot send to channel." nil
1878   (erc-display-message parsed '(notice error) 'active
1879                        's404 ?c (cadr (erc-response.command-args parsed))))
1880
1881
1882 (define-erc-response-handler (405)
1883   "Can't join that many channels." nil
1884   (erc-display-message parsed '(notice error) 'active
1885                        's405 ?c (cadr (erc-response.command-args parsed))))
1886
1887 (define-erc-response-handler (406)
1888   "No such nick." nil
1889   (erc-display-message parsed '(notice error) 'active
1890                        's406 ?n (cadr (erc-response.command-args parsed))))
1891
1892 (define-erc-response-handler (412)
1893   "No text to send." nil
1894   (erc-display-message parsed '(notice error) 'active 's412))
1895
1896 (define-erc-response-handler (421)
1897   "Unknown command." nil
1898   (erc-display-message parsed '(notice error) 'active 's421
1899                        ?c (cadr (erc-response.command-args parsed))))
1900
1901 (define-erc-response-handler (432)
1902   "Bad nick." nil
1903   (erc-display-message parsed '(notice error) 'active 's432
1904                        ?n (cadr (erc-response.command-args parsed))))
1905
1906 (define-erc-response-handler (433)
1907   "Login-time \"nick in use\"." nil
1908   (erc-nickname-in-use (cadr (erc-response.command-args parsed))
1909                        "already in use"))
1910
1911 (define-erc-response-handler (437)
1912   "Nick temporarily unavailable (on IRCnet)." nil
1913   (let ((nick/channel (cadr (erc-response.command-args parsed))))
1914     (unless (erc-channel-p nick/channel)
1915       (erc-nickname-in-use nick/channel "temporarily unavailable"))))
1916
1917 (define-erc-response-handler (442)
1918   "Not on channel." nil
1919   (erc-display-message parsed '(notice error) 'active 's442
1920                        ?c (cadr (erc-response.command-args parsed))))
1921
1922 (define-erc-response-handler (461)
1923   "Not enough parameters for command." nil
1924   (erc-display-message parsed '(notice error)  'active 's461
1925                        ?c (cadr (erc-response.command-args parsed))
1926                        ?m (erc-response.contents parsed)))
1927
1928 (define-erc-response-handler (465)
1929   "You are banned from this server." nil
1930   (setq erc-server-banned t)
1931   ;; show the server's message, as a reason might be provided
1932   (erc-display-error-notice
1933    parsed
1934    (erc-response.contents parsed)))
1935
1936 (define-erc-response-handler (474)
1937   "Banned from channel errors." nil
1938   (erc-display-message parsed '(notice error) nil
1939                        (intern (format "s%s"
1940                                        (erc-response.command parsed)))
1941                        ?c (cadr (erc-response.command-args parsed))))
1942
1943 (define-erc-response-handler (475)
1944   "Channel key needed." nil
1945   (erc-display-message parsed '(notice error) nil 's475
1946                        ?c (cadr (erc-response.command-args parsed)))
1947   (when erc-prompt-for-channel-key
1948     (let ((channel (cadr (erc-response.command-args parsed)))
1949           (key (read-from-minibuffer
1950                 (format "Channel %s is mode +k.  Enter key (RET to cancel): "
1951                         (cadr (erc-response.command-args parsed))))))
1952       (when (and key (> (length key) 0))
1953           (erc-cmd-JOIN channel key)))))
1954
1955 (define-erc-response-handler (477)
1956   "Channel doesn't support modes." nil
1957   (let ((channel (cadr (erc-response.command-args parsed)))
1958         (message (erc-response.contents parsed)))
1959     (erc-display-message parsed 'notice (erc-get-buffer channel proc)
1960                          (format "%s: %s" channel message))))
1961
1962 (define-erc-response-handler (482)
1963   "You need to be a channel operator to do that." nil
1964   (let ((channel (cadr (erc-response.command-args parsed)))
1965         (message (erc-response.contents parsed)))
1966     (erc-display-message parsed '(error notice) 'active 's482
1967                          ?c channel ?m message)))
1968
1969 (define-erc-response-handler (671)
1970   "Secure connection response in WHOIS." nil
1971   (let ((nick (cadr (erc-response.command-args parsed)))
1972         (securemsg (erc-response.contents parsed)))
1973     (erc-display-message parsed 'notice 'active 's671
1974                          ?n nick ?a securemsg)))
1975
1976 (define-erc-response-handler (431 445 446 451 462 463 464 481 483 484 485
1977                                   491 501 502)
1978   ;; 431 - No nickname given
1979   ;; 445 - SUMMON has been disabled
1980   ;; 446 - USERS has been disabled
1981   ;; 451 - You have not registered
1982   ;; 462 - Unauthorized command (already registered)
1983   ;; 463 - Your host isn't among the privileged
1984   ;; 464 - Password incorrect
1985   ;; 481 - Need IRCop privileges
1986   ;; 483 - You can't kill a server!
1987   ;; 484 - Your connection is restricted!
1988   ;; 485 - You're not the original channel operator
1989   ;; 491 - No O-lines for your host
1990   ;; 501 - Unknown MODE flag
1991   ;; 502 - Cannot change mode for other users
1992   "Generic display of server error messages.
1993
1994 See `erc-display-error-notice'." nil
1995   (erc-display-error-notice
1996    parsed
1997    (intern (format "s%s" (erc-response.command parsed)))))
1998
1999 ;; FIXME: These are yet to be implemented, they're just stubs for now
2000 ;; -- Lawrence 2004/05/12
2001
2002 ;; response numbers left here for reference
2003
2004 ;; (define-erc-response-handler (323 364 365 381 382 392 393 394 395
2005 ;;                               200 201 202 203 204 205 206 208 209 211 212 213
2006 ;;                               214 215 216 217 218 219 241 242 243 244 249 261
2007 ;;                               262 302 342 351 402 407 409 411 413 414 415
2008 ;;                               423 424 436 441 443 444 467 471 472 473 KILL)
2009 ;;   nil nil
2010 ;;   (ignore proc parsed))
2011
2012 (provide 'erc-backend)
2013
2014 ;;; erc-backend.el ends here
2015 ;; Local Variables:
2016 ;; indent-tabs-mode: nil
2017 ;; End: