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;;; rcirc.el --- default, simple IRC client.

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;; Copyright (C) 2005-2012 Free Software Foundation, Inc.
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;; Author: Ryan Yeske <rcyeske@gmail.com>
;; Maintainers: Ryan Yeske <rcyeske@gmail.com>,
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;;              Deniz Dogan <deniz@dogan.se>
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;; Keywords: comm

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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

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;; Internet Relay Chat (IRC) is a form of instant communication over
;; the Internet. It is mainly designed for group (many-to-many)
;; communication in discussion forums called channels, but also allows
;; one-to-one communication.

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;; Rcirc has simple defaults and clear and consistent behavior.
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;; Message arrival timestamps, activity notification on the modeline,
;; message filling, nick completion, and keepalive pings are all
;; enabled by default, but can easily be adjusted or turned off.  Each
;; discussion takes place in its own buffer and there is a single
;; server buffer per connection.
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;; Open a new irc connection with:
;; M-x irc RET

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;;; Todo:

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;;; Code:

(require 'ring)
(require 'time-date)
(eval-when-compile (require 'cl))

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(defgroup rcirc nil
  "Simple IRC client."
  :version "22.1"
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  :prefix "rcirc-"
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  :link '(custom-manual "(rcirc)")
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  :group 'applications)

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(defcustom rcirc-server-alist
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  '(("irc.freenode.net" :channels ("#rcirc")
     ;; Don't use the TLS port by default, in case gnutls is not available.
     ;; :port 7000 :encryption tls
     ))
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  "An alist of IRC connections to establish when running `rcirc'.
Each element looks like (SERVER-NAME PARAMETERS).

SERVER-NAME is a string describing the server to connect
to.

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The optional PARAMETERS come in pairs PARAMETER VALUE.

The following parameters are recognized:

`:nick'

VALUE must be a string.  If absent, `rcirc-default-nick' is used
for this connection.

`:port'

VALUE must be a number or string.  If absent,
`rcirc-default-port' is used.

`:user-name'

VALUE must be a string.  If absent, `rcirc-default-user-name' is
used.

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`:password'

VALUE must be a string.  If absent, no PASS command will be sent
to the server.

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`:full-name'

VALUE must be a string.  If absent, `rcirc-default-full-name' is
used.

`:channels'

VALUE must be a list of strings describing which channels to join
when connecting to this server.  If absent, no channels will be
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connected to automatically.

`:encryption'

VALUE must be `plain' (the default) for unencrypted connections, or `tls'
for connections using SSL/TLS."
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  :type '(alist :key-type string
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		:value-type (plist :options
                                   ((:nick string)
                                    (:port integer)
                                    (:user-name string)
                                    (:password string)
                                    (:full-name string)
                                    (:channels (repeat string))
                                    (:encryption (choice (const tls)
                                                         (const plain))))))
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  :group 'rcirc)
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(defcustom rcirc-default-port 6667
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  "The default port to connect to."
  :type 'integer
  :group 'rcirc)
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(defcustom rcirc-default-nick (user-login-name)
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  "Your nick."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-default-user-name "user"
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  "Your user name sent to the server when connecting."
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  :version "24.1"                       ; changed default
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  :type 'string
  :group 'rcirc)
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(defcustom rcirc-default-full-name "unknown"
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  "The full name sent to the server when connecting."
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  :version "24.1"                       ; changed default
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  :type 'string
  :group 'rcirc)
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(defcustom rcirc-fill-flag t
  "*Non-nil means line-wrap messages printed in channel buffers."
  :type 'boolean
  :group 'rcirc)
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(defcustom rcirc-fill-column nil
  "*Column beyond which automatic line-wrapping should happen.
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If nil, use value of `fill-column'.  If 'frame-width, use the
maximum frame width."
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  :type '(choice (const :tag "Value of `fill-column'")
		 (const :tag "Full frame width" frame-width)
		 (integer :tag "Number of columns"))
  :group 'rcirc)
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(defcustom rcirc-fill-prefix nil
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  "*Text to insert before filled lines.
If nil, calculate the prefix dynamically to line up text
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underneath each nick."
  :type '(choice (const :tag "Dynamic" nil)
		 (string :tag "Prefix text"))
  :group 'rcirc)
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(defvar rcirc-ignore-buffer-activity-flag nil
  "If non-nil, ignore activity in this buffer.")
(make-variable-buffer-local 'rcirc-ignore-buffer-activity-flag)
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(defvar rcirc-low-priority-flag nil
  "If non-nil, activity in this buffer is considered low priority.")
(make-variable-buffer-local 'rcirc-low-priority-flag)

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(defvar rcirc-omit-mode nil
  "Non-nil if Rcirc-Omit mode is enabled.
Use the command `rcirc-omit-mode' to change this variable.")
(make-variable-buffer-local 'rcirc-omit-mode)

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(defcustom rcirc-time-format "%H:%M "
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  "*Describes how timestamps are printed.
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Used as the first arg to `format-time-string'."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-input-ring-size 1024
  "*Size of input history ring."
  :type 'integer
  :group 'rcirc)
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(defcustom rcirc-read-only-flag t
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  "*Non-nil means make text in IRC buffers read-only."
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  :type 'boolean
  :group 'rcirc)
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(defcustom rcirc-buffer-maximum-lines nil
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  "*The maximum size in lines for rcirc buffers.
Channel buffers are truncated from the top to be no greater than this
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number.  If zero or nil, no truncating is done."
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  :type '(choice (const :tag "No truncation" nil)
		 (integer :tag "Number of lines"))
  :group 'rcirc)
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(defcustom rcirc-scroll-show-maximum-output t
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  "*If non-nil, scroll buffer to keep the point at the bottom of
the window."
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  :type 'boolean
  :group 'rcirc)
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(defcustom rcirc-authinfo nil
  "List of authentication passwords.
Each element of the list is a list with a SERVER-REGEXP string
and a method symbol followed by method specific arguments.

The valid METHOD symbols are `nickserv', `chanserv' and
`bitlbee'.
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The ARGUMENTS for each METHOD symbol are:
  `nickserv': NICK PASSWORD [NICKSERV-NICK]
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  `chanserv': NICK CHANNEL PASSWORD
  `bitlbee': NICK PASSWORD
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  `quakenet': ACCOUNT PASSWORD
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Examples:
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 ((\"freenode\" nickserv \"bob\" \"p455w0rd\")
  (\"freenode\" chanserv \"bob\" \"#bobland\" \"passwd99\")
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  (\"bitlbee\" bitlbee \"robert\" \"sekrit\")
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  (\"dal.net\" nickserv \"bob\" \"sekrit\" \"NickServ@services.dal.net\")
  (\"quakenet.org\" quakenet \"bobby\" \"sekrit\"))"
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  :type '(alist :key-type (string :tag "Server")
		:value-type (choice (list :tag "NickServ"
					  (const nickserv)
					  (string :tag "Nick")
					  (string :tag "Password"))
				    (list :tag "ChanServ"
					  (const chanserv)
					  (string :tag "Nick")
					  (string :tag "Channel")
					  (string :tag "Password"))
				    (list :tag "BitlBee"
					  (const bitlbee)
					  (string :tag "Nick")
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					  (string :tag "Password"))
                                    (list :tag "QuakeNet"
                                          (const quakenet)
                                          (string :tag "Account")
                                          (string :tag "Password"))))
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  :group 'rcirc)
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(defcustom rcirc-auto-authenticate-flag t
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  "*Non-nil means automatically send authentication string to server.
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See also `rcirc-authinfo'."
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  :type 'boolean
  :group 'rcirc)
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(defcustom rcirc-authenticate-before-join t
  "*Non-nil means authenticate to services before joining channels.
Currently only works with NickServ on some networks."
  :version "24.1"
  :type 'boolean
  :group 'rcirc)

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(defcustom rcirc-prompt "> "
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  "Prompt string to use in IRC buffers.
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The following replacements are made:
%n is your nick.
%s is the server.
%t is the buffer target, a channel or a user.

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Setting this alone will not affect the prompt;
use either M-x customize or also call `rcirc-update-prompt'."
  :type 'string
  :set 'rcirc-set-changed
  :initialize 'custom-initialize-default
  :group 'rcirc)

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(defcustom rcirc-keywords nil
  "List of keywords to highlight in message text."
  :type '(repeat string)
  :group 'rcirc)

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(defcustom rcirc-ignore-list ()
  "List of ignored nicks.
Use /ignore to list them, use /ignore NICK to add or remove a nick."
  :type '(repeat string)
  :group 'rcirc)

(defvar rcirc-ignore-list-automatic ()
  "List of ignored nicks added to `rcirc-ignore-list' because of renaming.
When an ignored person renames, their nick is added to both lists.
Nicks will be removed from the automatic list on follow-up renamings or
parts.")

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(defcustom rcirc-bright-nicks nil
  "List of nicks to be emphasized.
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See `rcirc-bright-nick' face."
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  :type '(repeat string)
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  :group 'rcirc)

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(defcustom rcirc-dim-nicks nil
  "List of nicks to be deemphasized.
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See `rcirc-dim-nick' face."
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  :type '(repeat string)
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  :group 'rcirc)

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(defcustom rcirc-print-hooks nil
  "Hook run after text is printed.
Called with 5 arguments, PROCESS, SENDER, RESPONSE, TARGET and TEXT."
  :type 'hook
  :group 'rcirc)
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(defvar rcirc-authenticated-hook nil
  "Hook run after successfully authenticated.")

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(defcustom rcirc-always-use-server-buffer-flag nil
  "Non-nil means messages without a channel target will go to the server buffer."
  :type 'boolean
  :group 'rcirc)

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(defcustom rcirc-decode-coding-system 'utf-8
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  "Coding system used to decode incoming irc messages.
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Set to 'undecided if you want the encoding of the incoming
messages autodetected."
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  :type 'coding-system
  :group 'rcirc)

(defcustom rcirc-encode-coding-system 'utf-8
  "Coding system used to encode outgoing irc messages."
  :type 'coding-system
  :group 'rcirc)

(defcustom rcirc-coding-system-alist nil
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  "Alist to decide a coding system to use for a channel I/O operation.
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The format is ((PATTERN . VAL) ...).
PATTERN is either a string or a cons of strings.
If PATTERN is a string, it is used to match a target.
If PATTERN is a cons of strings, the car part is used to match a
target, and the cdr part is used to match a server.
VAL is either a coding system or a cons of coding systems.
If VAL is a coding system, it is used for both decoding and encoding
messages.
If VAL is a cons of coding systems, the car part is used for decoding,
and the cdr part is used for encoding."
  :type '(alist :key-type (choice (string :tag "Channel Regexp")
					  (cons (string :tag "Channel Regexp")
						(string :tag "Server Regexp")))
		:value-type (choice coding-system
				    (cons (coding-system :tag "Decode")
					  (coding-system :tag "Encode"))))
  :group 'rcirc)

(defcustom rcirc-multiline-major-mode 'fundamental-mode
  "Major-mode function to use in multiline edit buffers."
  :type 'function
  :group 'rcirc)

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(defcustom rcirc-nick-completion-format "%s: "
  "Format string to use in nick completions.

The format string is only used when completing at the beginning
of a line.  The string is passed as the first argument to
`format' with the nickname as the second argument."
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  :version "24.1"
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  :type 'string
  :group 'rcirc)

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(defvar rcirc-nick nil)

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(defvar rcirc-prompt-start-marker nil)
(defvar rcirc-prompt-end-marker nil)

(defvar rcirc-nick-table nil)

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(defvar rcirc-recent-quit-alist nil
  "Alist of nicks that have recently quit or parted the channel.")

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(defvar rcirc-nick-syntax-table
  (let ((table (make-syntax-table text-mode-syntax-table)))
    (mapc (lambda (c) (modify-syntax-entry c "w" table))
          "[]\\`_^{|}-")
    (modify-syntax-entry ?' "_" table)
    table)
  "Syntax table which includes all nick characters as word constituents.")

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;; each process has an alist of (target . buffer) pairs
(defvar rcirc-buffer-alist nil)

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(defvar rcirc-activity nil
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  "List of buffers with unviewed activity.")
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(defvar rcirc-activity-string ""
  "String displayed in modeline representing `rcirc-activity'.")
(put 'rcirc-activity-string 'risky-local-variable t)

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(defvar rcirc-server-buffer nil
  "The server buffer associated with this channel buffer.")
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(defvar rcirc-target nil
  "The channel or user associated with this buffer.")

(defvar rcirc-urls nil
  "List of urls seen in the current buffer.")
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(put 'rcirc-urls 'permanent-local t)
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(defvar rcirc-timeout-seconds 600
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  "Kill connection after this many seconds if there is no activity.")
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(defconst rcirc-id-string (concat "rcirc on GNU Emacs " emacs-version))
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(defvar rcirc-startup-channels nil)
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(defvar rcirc-server-name-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-server-port-history nil
  "History variable for \\[rcirc] call.")

(defvar rcirc-nick-name-history nil
  "History variable for \\[rcirc] call.")

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(defvar rcirc-user-name-history nil
  "History variable for \\[rcirc] call.")

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;;;###autoload
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(defun rcirc (arg)
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  "Connect to all servers in `rcirc-server-alist'.
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Do not connect to a server if it is already connected.

If ARG is non-nil, instead prompt for connection parameters."
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  (interactive "P")
  (if arg
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      (let* ((server (completing-read "IRC Server: "
				      rcirc-server-alist
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				      nil nil
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				      (caar rcirc-server-alist)
				      'rcirc-server-name-history))
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	     (server-plist (cdr (assoc-string server rcirc-server-alist)))
	     (port (read-string "IRC Port: "
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				(number-to-string
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				 (or (plist-get server-plist :port)
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				     rcirc-default-port))
				'rcirc-server-port-history))
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	     (nick (read-string "IRC Nick: "
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				(or (plist-get server-plist :nick)
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				    rcirc-default-nick)
				'rcirc-nick-name-history))
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	     (user-name (read-string "IRC Username: "
                                     (or (plist-get server-plist :user-name)
                                         rcirc-default-user-name)
                                     'rcirc-user-name-history))
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	     (password (read-passwd "IRC Password: " nil
                                    (plist-get server-plist :password)))
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	     (channels (split-string
			(read-string "IRC Channels: "
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				     (mapconcat 'identity
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						(plist-get server-plist
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							   :channels)
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						" "))
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			"[, ]+" t))
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             (encryption (rcirc-prompt-for-encryption server-plist)))
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	(rcirc-connect server port nick user-name
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		       rcirc-default-full-name
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		       channels password encryption))
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    ;; connect to servers in `rcirc-server-alist'
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    (let (connected-servers)
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      (dolist (c rcirc-server-alist)
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	(let ((server (car c))
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	      (nick (or (plist-get (cdr c) :nick) rcirc-default-nick))
	      (port (or (plist-get (cdr c) :port) rcirc-default-port))
	      (user-name (or (plist-get (cdr c) :user-name)
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			     rcirc-default-user-name))
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	      (full-name (or (plist-get (cdr c) :full-name)
			     rcirc-default-full-name))
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	      (channels (plist-get (cdr c) :channels))
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              (password (plist-get (cdr c) :password))
              (encryption (plist-get (cdr c) :encryption)))
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	  (when server
	    (let (connected)
	      (dolist (p (rcirc-process-list))
		(when (string= server (process-name p))
		  (setq connected p)))
	      (if (not connected)
		  (condition-case e
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		      (rcirc-connect server port nick user-name
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				     full-name channels password encryption)
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		    (quit (message "Quit connecting to %s" server)))
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		(with-current-buffer (process-buffer connected)
		  (setq connected-servers
			(cons (process-contact (get-buffer-process
						(current-buffer)) :host)
			      connected-servers))))))))
      (when connected-servers
	(message "Already connected to %s"
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		 (if (cdr connected-servers)
		     (concat (mapconcat 'identity (butlast connected-servers) ", ")
			     ", and "
			     (car (last connected-servers)))
		   (car connected-servers)))))))
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;;;###autoload
(defalias 'irc 'rcirc)


(defvar rcirc-process-output nil)
(defvar rcirc-topic nil)
(defvar rcirc-keepalive-timer nil)
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(defvar rcirc-last-server-message-time nil)
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(defvar rcirc-server nil)		; server provided by server
(defvar rcirc-server-name nil)		; server name given by 001 response
(defvar rcirc-timeout-timer nil)
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(defvar rcirc-user-authenticated nil)
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(defvar rcirc-user-disconnect nil)
(defvar rcirc-connecting nil)
(defvar rcirc-process nil)
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;;;###autoload
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(defun rcirc-connect (server &optional port nick user-name
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                             full-name startup-channels password encryption)
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  (save-excursion
    (message "Connecting to %s..." server)
    (let* ((inhibit-eol-conversion)
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           (port-number (if port
			    (if (stringp port)
				(string-to-number port)
			      port)
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			  rcirc-default-port))
	   (nick (or nick rcirc-default-nick))
	   (user-name (or user-name rcirc-default-user-name))
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	   (full-name (or full-name rcirc-default-full-name))
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	   (startup-channels startup-channels)
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           (process (open-network-stream
                     server nil server port-number
                     :type (or encryption 'plain))))
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      ;; set up process
      (set-process-coding-system process 'raw-text 'raw-text)
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      (switch-to-buffer (rcirc-generate-new-buffer-name process nil))
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      (set-process-buffer process (current-buffer))
      (rcirc-mode process nil)
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      (set-process-sentinel process 'rcirc-sentinel)
      (set-process-filter process 'rcirc-filter)
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      (set (make-local-variable 'rcirc-process) process)
      (set (make-local-variable 'rcirc-server) server)
      (set (make-local-variable 'rcirc-server-name) server) ; Update when we get 001 response.
      (set (make-local-variable 'rcirc-buffer-alist) nil)
      (set (make-local-variable 'rcirc-nick-table)
           (make-hash-table :test 'equal))
      (set (make-local-variable 'rcirc-nick) nick)
      (set (make-local-variable 'rcirc-process-output) nil)
      (set (make-local-variable 'rcirc-startup-channels) startup-channels)
      (set (make-local-variable 'rcirc-last-server-message-time)
           (current-time))

      (set (make-local-variable 'rcirc-timeout-timer) nil)
      (set (make-local-variable 'rcirc-user-disconnect) nil)
      (set (make-local-variable 'rcirc-user-authenticated) nil)
      (set (make-local-variable 'rcirc-connecting) t)
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      (add-hook 'auto-save-hook 'rcirc-log-write)

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      ;; identify
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      (unless (zerop (length password))
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        (rcirc-send-string process (concat "PASS " password)))
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      (rcirc-send-string process (concat "NICK " nick))
      (rcirc-send-string process (concat "USER " user-name
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                                         " 0 * :" full-name))
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      ;; setup ping timer if necessary
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      (unless rcirc-keepalive-timer
	(setq rcirc-keepalive-timer
	      (run-at-time 0 (/ rcirc-timeout-seconds 2) 'rcirc-keepalive)))
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      (message "Connecting to %s...done" server)

      ;; return process object
      process)))

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(defmacro with-rcirc-process-buffer (process &rest body)
  (declare (indent 1) (debug t))
  `(with-current-buffer (process-buffer ,process)
     ,@body))

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(defmacro with-rcirc-server-buffer (&rest body)
  (declare (indent 0) (debug t))
  `(with-current-buffer rcirc-server-buffer
     ,@body))

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(defun rcirc-float-time ()
  (if (featurep 'xemacs)
      (time-to-seconds (current-time))
    (float-time)))

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(defun rcirc-prompt-for-encryption (server-plist)
  "Prompt the user for the encryption method to use.
SERVER-PLIST is the property list for the server."
  (let ((msg "Encryption (default %s): ")
        (choices '("plain" "tls"))
        (default (or (plist-get server-plist :encryption)
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                     'plain)))
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    (intern
     (completing-read (format msg default)
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                      choices nil t nil nil (symbol-name default)))))
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(defun rcirc-keepalive ()
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  "Send keep alive pings to active rcirc processes.
Kill processes that have not received a server message since the
last ping."
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  (if (rcirc-process-list)
      (mapc (lambda (process)
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	      (with-rcirc-process-buffer process
		(when (not rcirc-connecting)
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                  (rcirc-send-ctcp process
                                   rcirc-nick
                                   (format "KEEPALIVE %f"
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                                           (rcirc-float-time))))))
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            (rcirc-process-list))
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    ;; no processes, clean up timer
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    (cancel-timer rcirc-keepalive-timer)
    (setq rcirc-keepalive-timer nil)))

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(defun rcirc-handler-ctcp-KEEPALIVE (process target sender message)
  (with-rcirc-process-buffer process
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    (setq header-line-format (format "%f" (- (rcirc-float-time)
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					     (string-to-number message))))))

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(defvar rcirc-debug-buffer "*rcirc debug*")
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(defvar rcirc-debug-flag nil
  "If non-nil, write information to `rcirc-debug-buffer'.")
(defun rcirc-debug (process text)
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  "Add an entry to the debug log including PROCESS and TEXT.
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Debug text is written to `rcirc-debug-buffer' if `rcirc-debug-flag'
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is non-nil."
  (when rcirc-debug-flag
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    (with-current-buffer (get-buffer-create rcirc-debug-buffer)
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      (goto-char (point-max))
      (insert (concat
	       "["
	       (format-time-string "%Y-%m-%dT%T ") (process-name process)
	       "] "
	       text)))))
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(defvar rcirc-sentinel-hooks nil
  "Hook functions called when the process sentinel is called.
Functions are called with PROCESS and SENTINEL arguments.")

(defun rcirc-sentinel (process sentinel)
  "Called when PROCESS receives SENTINEL."
  (let ((sentinel (replace-regexp-in-string "\n" "" sentinel)))
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    (rcirc-debug process (format "SENTINEL: %S %S\n" process sentinel))
    (with-rcirc-process-buffer process
      (dolist (buffer (cons nil (mapcar 'cdr rcirc-buffer-alist)))
	(with-current-buffer (or buffer (current-buffer))
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	  (rcirc-print process "rcirc.el" "ERROR" rcirc-target
		       (format "%s: %s (%S)"
			       (process-name process)
			       sentinel
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			       (process-status process)) (not rcirc-target))
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	  (rcirc-disconnect-buffer)))
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      (run-hook-with-args 'rcirc-sentinel-hooks process sentinel))))
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(defun rcirc-disconnect-buffer (&optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    ;; set rcirc-target to nil for each channel so cleanup
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    ;; doesn't happen when we reconnect
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    (setq rcirc-target nil)
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    (setq mode-line-process ":disconnected")))
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(defun rcirc-process-list ()
  "Return a list of rcirc processes."
  (let (ps)
    (mapc (lambda (p)
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            (when (buffer-live-p (process-buffer p))
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              (with-rcirc-process-buffer p
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                (when (eq major-mode 'rcirc-mode)
                  (setq ps (cons p ps))))))
          (process-list))
    ps))

(defvar rcirc-receive-message-hooks nil
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  "Hook functions run when a message is received from server.
Function is called with PROCESS, COMMAND, SENDER, ARGS and LINE.")
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(defun rcirc-filter (process output)
  "Called when PROCESS receives OUTPUT."
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  (rcirc-debug process output)
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  (rcirc-reschedule-timeout process)
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  (with-rcirc-process-buffer process
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    (setq rcirc-last-server-message-time (current-time))
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    (setq rcirc-process-output (concat rcirc-process-output output))
    (when (= (aref rcirc-process-output
                   (1- (length rcirc-process-output))) ?\n)
      (mapc (lambda (line)
              (rcirc-process-server-response process line))
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            (split-string rcirc-process-output "[\n\r]" t))
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      (setq rcirc-process-output nil))))

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(defun rcirc-reschedule-timeout (process)
  (with-rcirc-process-buffer process
    (when (not rcirc-connecting)
      (with-rcirc-process-buffer process
	(when rcirc-timeout-timer (cancel-timer rcirc-timeout-timer))
	(setq rcirc-timeout-timer (run-at-time rcirc-timeout-seconds nil
					       'rcirc-delete-process
					       process))))))

(defun rcirc-delete-process (process)
  (delete-process process))

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(defvar rcirc-trap-errors-flag t)
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(defun rcirc-process-server-response (process text)
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  (if rcirc-trap-errors-flag
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      (condition-case err
          (rcirc-process-server-response-1 process text)
        (error
         (rcirc-print process "RCIRC" "ERROR" nil
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                      (format "\"%s\" %s" text err) t)))
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    (rcirc-process-server-response-1 process text)))

(defun rcirc-process-server-response-1 (process text)
  (if (string-match "^\\(:\\([^ ]+\\) \\)?\\([^ ]+\\) \\(.+\\)$" text)
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      (let* ((user (match-string 2 text))
	     (sender (rcirc-user-nick user))
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             (cmd (match-string 3 text))
             (args (match-string 4 text))
             (handler (intern-soft (concat "rcirc-handler-" cmd))))
        (string-match "^\\([^:]*\\):?\\(.+\\)?$" args)
        (let* ((args1 (match-string 1 args))
               (args2 (match-string 2 args))
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               (args (delq nil (append (split-string args1 " " t)
				       (list args2)))))
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        (if (not (fboundp handler))
            (rcirc-handler-generic process cmd sender args text)
          (funcall handler process sender args text))
        (run-hook-with-args 'rcirc-receive-message-hooks
                            process cmd sender args text)))
    (message "UNHANDLED: %s" text)))

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(defvar rcirc-responses-no-activity '("305" "306")
  "Responses that don't trigger activity in the mode-line indicator.")

(defun rcirc-handler-generic (process response sender args text)
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  "Generic server response handler."
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  (rcirc-print process sender response nil
               (mapconcat 'identity (cdr args) " ")
	       (not (member response rcirc-responses-no-activity))))
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(defun rcirc--connection-open-p (process)
  (memq (process-status process) '(run open)))

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(defun rcirc-send-string (process string)
  "Send PROCESS a STRING plus a newline."
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  (let ((string (concat (encode-coding-string string rcirc-encode-coding-system)
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                        "\n")))
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    (unless (rcirc--connection-open-p process)
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      (error "Network connection to %s is not open"
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             (process-name process)))
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    (rcirc-debug process string)
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    (process-send-string process string)))

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(defun rcirc-send-privmsg (process target string)
  (rcirc-send-string process (format "PRIVMSG %s :%s" target string)))

(defun rcirc-send-ctcp (process target request &optional args)
  (let ((args (if args (concat " " args) "")))
    (rcirc-send-privmsg process target
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                        (format "\C-a%s%s\C-a" request args))))
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(defun rcirc-buffer-process (&optional buffer)
  "Return the process associated with channel BUFFER.
With no argument or nil as argument, use the current buffer."
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  (or (get-buffer-process (if buffer
			      (with-current-buffer buffer
				rcirc-server-buffer)
			    rcirc-server-buffer))
      rcirc-process))
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(defun rcirc-server-name (process)
  "Return PROCESS server name, given by the 001 response."
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  (with-rcirc-process-buffer process
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    (or rcirc-server-name
	(warn "server name for process %S unknown" process))))
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(defun rcirc-nick (process)
  "Return PROCESS nick."
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  (with-rcirc-process-buffer process
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    (or rcirc-nick rcirc-default-nick)))

(defun rcirc-buffer-nick (&optional buffer)
  "Return the nick associated with BUFFER.
With no argument or nil as argument, use the current buffer."
  (with-current-buffer (or buffer (current-buffer))
    (with-current-buffer rcirc-server-buffer
      (or rcirc-nick rcirc-default-nick))))
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(defvar rcirc-max-message-length 420
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  "Messages longer than this value will be split.")

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(defun rcirc-send-message (process target message &optional noticep silent)
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  "Send TARGET associated with PROCESS a privmsg with text MESSAGE.
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If NOTICEP is non-nil, send a notice instead of privmsg.
If SILENT is non-nil, do not print the message in any irc buffer."
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  ;; max message length is 512 including CRLF
  (let* ((response (if noticep "NOTICE" "PRIVMSG"))
         (oversize (> (length message) rcirc-max-message-length))
         (text (if oversize
                   (substring message 0 rcirc-max-message-length)
                 message))
         (text (if (string= text "")
                   " "
                 text))
         (more (if oversize
                   (substring message rcirc-max-message-length))))
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    (rcirc-get-buffer-create process target)
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    (rcirc-send-string process (concat response " " target " :" text))
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    (unless silent
      (rcirc-print process (rcirc-nick process) response target text))
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    (when more (rcirc-send-message process target more noticep))))
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(defvar rcirc-input-ring nil)
(defvar rcirc-input-ring-index 0)
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(defun rcirc-prev-input-string (arg)
  (ring-ref rcirc-input-ring (+ rcirc-input-ring-index arg)))

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(defun rcirc-insert-prev-input ()
  (interactive)
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  (when (<= rcirc-prompt-end-marker (point))
    (delete-region rcirc-prompt-end-marker (point-max))
    (insert (rcirc-prev-input-string 0))
    (setq rcirc-input-ring-index (1+ rcirc-input-ring-index))))

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(defun rcirc-insert-next-input ()
  (interactive)
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  (when (<= rcirc-prompt-end-marker (point))
    (delete-region rcirc-prompt-end-marker (point-max))
    (setq rcirc-input-ring-index (1- rcirc-input-ring-index))
    (insert (rcirc-prev-input-string -1))))

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(defvar rcirc-server-commands
  '("/admin"   "/away"   "/connect" "/die"      "/error"   "/info"
    "/invite"  "/ison"   "/join"    "/kick"     "/kill"    "/links"
    "/list"    "/lusers" "/mode"    "/motd"     "/names"   "/nick"
    "/notice"  "/oper"   "/part"    "/pass"     "/ping"    "/pong"
    "/privmsg" "/quit"   "/rehash"  "/restart"  "/service" "/servlist"
    "/server"  "/squery" "/squit"   "/stats"    "/summon"  "/time"
    "/topic"   "/trace"  "/user"    "/userhost" "/users"   "/version"
    "/wallops" "/who"    "/whois"   "/whowas")
  "A list of user commands by IRC server.
The value defaults to RFCs 1459 and 2812.")

;; /me and /ctcp are not defined by `defun-rcirc-command'.
(defvar rcirc-client-commands '("/me" "/ctcp")
  "A list of user commands defined by IRC client rcirc.
The list is updated automatically by `defun-rcirc-command'.")

(defun rcirc-completion-at-point ()
  "Function used for `completion-at-point-functions' in `rcirc-mode'."
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  (and (rcirc-looking-at-input)
       (let* ((beg (save-excursion
		     (if (re-search-backward " " rcirc-prompt-end-marker t)
			 (1+ (point))
		       rcirc-prompt-end-marker)))
	      (table (if (and (= beg rcirc-prompt-end-marker)
			      (eq (char-after beg) ?/))
			 (delete-dups
			  (nconc (sort (copy-sequence rcirc-client-commands)
				       'string-lessp)
				 (sort (copy-sequence rcirc-server-commands)
				       'string-lessp)))
		       (rcirc-channel-nicks (rcirc-buffer-process)
					    rcirc-target))))
	 (list beg (point) table))))
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(defvar rcirc-completions nil)
(defvar rcirc-completion-start nil)

(defun rcirc-complete ()
  "Cycle through completions from list of nicks in channel or IRC commands.
IRC command completion is performed only if '/' is the first input char."
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  (interactive)
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  (unless (rcirc-looking-at-input)
    (error "Point not located after rcirc prompt"))
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  (if (eq last-command this-command)
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      (setq rcirc-completions
	    (append (cdr rcirc-completions) (list (car rcirc-completions))))
    (let ((completion-ignore-case t)
	  (table (rcirc-completion-at-point)))
      (setq rcirc-completion-start (car table))
      (setq rcirc-completions
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	    (and rcirc-completion-start
		 (all-completions (buffer-substring rcirc-completion-start
						    (cadr table))
				  (nth 2 table))))))
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  (let ((completion (car rcirc-completions)))
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    (when completion
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      (delete-region rcirc-completion-start (point))
      (insert
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       (cond
        ((= (aref completion 0) ?/) (concat completion " "))
        ((= rcirc-completion-start rcirc-prompt-end-marker)
         (format rcirc-nick-completion-format completion))
        (t completion))))))
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(defun set-rcirc-decode-coding-system (coding-system)
  "Set the decode coding system used in this channel."
  (interactive "zCoding system for incoming messages: ")
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  (set (make-local-variable 'rcirc-decode-coding-system) coding-system))
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(defun set-rcirc-encode-coding-system (coding-system)
  "Set the encode coding system used in this channel."
  (interactive "zCoding system for outgoing messages: ")
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  (set (make-local-variable 'rcirc-encode-coding-system) coding-system))
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(defvar rcirc-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "RET") 'rcirc-send-input)
    (define-key map (kbd "M-p") 'rcirc-insert-prev-input)
    (define-key map (kbd "M-n") 'rcirc-insert-next-input)
    (define-key map (kbd "TAB") 'rcirc-complete)
    (define-key map (kbd "C-c C-b") 'rcirc-browse-url)
    (define-key map (kbd "C-c C-c") 'rcirc-edit-multiline)
    (define-key map (kbd "C-c C-j") 'rcirc-cmd-join)
    (define-key map (kbd "C-c C-k") 'rcirc-cmd-kick)
    (define-key map (kbd "C-c C-l") 'rcirc-toggle-low-priority)
    (define-key map (kbd "C-c C-d") 'rcirc-cmd-mode)
    (define-key map (kbd "C-c C-m") 'rcirc-cmd-msg)
    (define-key map (kbd "C-c C-r") 'rcirc-cmd-nick) ; rename
    (define-key map (kbd "C-c C-o") 'rcirc-omit-mode)
    (define-key map (kbd "C-c C-p") 'rcirc-cmd-part)
    (define-key map (kbd "C-c C-q") 'rcirc-cmd-query)
    (define-key map (kbd "C-c C-t") 'rcirc-cmd-topic)
    (define-key map (kbd "C-c C-n") 'rcirc-cmd-names)
    (define-key map (kbd "C-c C-w") 'rcirc-cmd-whois)
    (define-key map (kbd "C-c C-x") 'rcirc-cmd-quit)
    (define-key map (kbd "C-c TAB") ; C-i
      'rcirc-toggle-ignore-buffer-activity)
    (define-key map (kbd "C-c C-s") 'rcirc-switch-to-server-buffer)
    (define-key map (kbd "C-c C-a") 'rcirc-jump-to-first-unread-line)
    map)
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  "Keymap for rcirc mode.")

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(defvar rcirc-short-buffer-name nil
  "Generated abbreviation to use to indicate buffer activity.")

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(defvar rcirc-mode-hook nil
  "Hook run when setting up rcirc buffer.")

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(defvar rcirc-last-post-time nil)

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(defvar rcirc-log-alist nil
  "Alist of lines to log to disk when `rcirc-log-flag' is non-nil.
Each element looks like (FILENAME . TEXT).")

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(defvar rcirc-current-line 0
  "The current number of responses printed in this channel.
This number is independent of the number of lines in the buffer.")

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(defun rcirc-mode (process target)
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  ;; FIXME: Use define-derived-mode.
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  "Major mode for IRC channel buffers.
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\\{rcirc-mode-map}"
  (kill-all-local-variables)
  (use-local-map rcirc-mode-map)
  (setq mode-name "rcirc")
  (setq major-mode 'rcirc-mode)
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  (setq mode-line-process nil)
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  (set (make-local-variable 'rcirc-input-ring)
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       ;; If rcirc-input-ring is already a ring with desired size do
       ;; not re-initialize.
       (if (and (ring-p rcirc-input-ring)
		(= (ring-size rcirc-input-ring)
		   rcirc-input-ring-size))
	   rcirc-input-ring
	 (make-ring rcirc-input-ring-size)))
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  (set (make-local-variable 'rcirc-server-buffer) (process-buffer process))
  (set (make-local-variable 'rcirc-target) target)
  (set (make-local-variable 'rcirc-topic) nil)
  (set (make-local-variable 'rcirc-last-post-time) (current-time))
  (set (make-local-variable 'fill-paragraph-function) 'rcirc-fill-paragraph)
  (set (make-local-variable 'rcirc-recent-quit-alist) nil)
  (set (make-local-variable 'rcirc-current-line) 0)

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  (use-hard-newlines t)
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  (set (make-local-variable 'rcirc-short-buffer-name) nil)
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  (set (make-local-variable 'rcirc-urls) nil)
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  ;; setup for omitting responses
  (setq buffer-invisibility-spec '())
  (setq buffer-display-table (make-display-table))
  (set-display-table-slot buffer-display-table 4
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			  (let ((glyph (make-glyph-code
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					?. 'font-lock-keyword-face)))
			    (make-vector 3 glyph)))

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  (dolist (i rcirc-coding-system-alist)
    (let ((chan (if (consp (car i)) (caar i) (car i)))
	  (serv (if (consp (car i)) (cdar i) "")))
      (when (and (string-match chan (or target ""))
		 (string-match serv (rcirc-server-name process)))
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	(set (make-local-variable 'rcirc-decode-coding-system)
             (if (consp (cdr i)) (cadr i) (cdr i)))
        (set (make-local-variable 'rcirc-encode-coding-system)
             (if (consp (cdr i)) (cddr i) (cdr i))))))
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  ;; setup the prompt and markers
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  (set (make-local-variable 'rcirc-prompt-start-marker) (point-max-marker))
  (set (make-local-variable 'rcirc-prompt-end-marker) (point-max-marker))
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  (rcirc-update-prompt)
  (goto-char rcirc-prompt-end-marker)
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  (set (make-local-variable 'overlay-arrow-position) (make-marker))
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  ;; if the user changes the major mode or kills the buffer, there is
  ;; cleanup work to do
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  (add-hook 'change-major-mode-hook 'rcirc-change-major-mode-hook nil t)
  (add-hook 'kill-buffer-hook 'rcirc-kill-buffer-hook nil t)
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  ;; add to buffer list, and update buffer abbrevs
  (when target				; skip server buffer
    (let ((buffer (current-buffer)))
      (with-rcirc-process-buffer process
	(setq rcirc-buffer-alist (cons (cons target buffer)
				       rcirc-buffer-alist))))
    (rcirc-update-short-buffer-names))

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  (add-hook 'completion-at-point-functions
            'rcirc-completion-at-point nil 'local)

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  (run-mode-hooks 'rcirc-mode-hook))
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(defun rcirc-update-prompt (&optional all)
  "Reset the prompt string in the current buffer.
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If ALL is non-nil, update prompts in all IRC buffers."
  (if all
      (mapc (lambda (process)
	      (mapc (lambda (buffer)
		      (with-current-buffer buffer
			(rcirc-update-prompt)))
		    (with-rcirc-process-buffer process
		      (mapcar 'cdr rcirc-buffer-alist))))
	    (rcirc-process-list))
    (let ((inhibit-read-only t)
	  (prompt (or rcirc-prompt "")))
      (mapc (lambda (rep)
	      (setq prompt
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