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

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;; Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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;; Author: Ryan Yeske
;; URL: http://www.nongnu.org/rcirc
;; Keywords: comm

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;; This file is part of GNU Emacs.
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;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
;; 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
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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.

;; Rcirc has simple defaults and clear and consistent behaviour.
;; 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

;;; Code:

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

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

(defcustom rcirc-server "irc.freenode.net"
  "The default server to connect to."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-port 6667
  "The default port to connect to."
  :type 'integer
  :group 'rcirc)
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(defcustom rcirc-nick (user-login-name)
  "Your nick."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-user-name (user-login-name)
  "Your user name sent to the server when connecting."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-user-full-name (if (string= (user-full-name) "")
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				 rcirc-user-name
			       (user-full-name))
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  "The full name sent to the server when connecting."
  :type 'string
  :group 'rcirc)
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(defcustom rcirc-startup-channels-alist '(("^irc.freenode.net$" "#emacs"))
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  "Alist of channels to join at startup.
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Each element looks like (SERVER-REGEXP . CHANNEL-LIST)."
  :type '(alist :key-type string :value-type (repeat 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
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maximum frame width."
  :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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(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."
  :type '(choice (const :tag "No truncation" nil)
		 (integer :tag "Number of lines"))
  :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 required ARGUMENTS for each METHOD symbol are:
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  `nickserv': NICK PASSWORD
  `chanserv': NICK CHANNEL PASSWORD
  `bitlbee': NICK PASSWORD
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Example:
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 ((\"freenode\" nickserv \"bob\" \"p455w0rd\")
  (\"freenode\" chanserv \"bob\" \"#bobland\" \"passwd99\")
  (\"bitlbee\" bitlbee \"robert\" \"sekrit\"))"
  :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")
					  (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-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-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)

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(defcustom rcirc-nick-abbrevs nil
  "List of short replacements for printing nicks."
  :type '(alist :key-type (string :tag "Nick")
		:value-type (string :tag "Abbrev"))
  :group 'rcirc)

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

(defvar rcirc-nick-table nil)

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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
  "List of channels with unviewed activity.")

(defvar rcirc-activity-string ""
  "String displayed in modeline representing `rcirc-activity'.")
(put 'rcirc-activity-string 'risky-local-variable t)

(defvar rcirc-process nil
  "The server process associated with this buffer.")

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

(defvar rcirc-urls nil
  "List of urls seen in the current buffer.")

(defvar rcirc-keepalive-seconds 60
  "Number of seconds between keepalive pings.")

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(defconst rcirc-id-string (concat "rcirc on GNU Emacs " emacs-version))
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(defvar rcirc-startup-channels nil)
;;;###autoload
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(defun rcirc (arg)
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  "Connect to IRC.
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If ARG is non-nil, prompt for a server to connect to."
  (interactive "P")
  (if arg
      (let* ((server (read-string "IRC Server: " rcirc-server))
	     (port (read-string "IRC Port: " (number-to-string rcirc-port)))
	     (nick (read-string "IRC Nick: " rcirc-nick))
	     (channels (split-string
			(read-string "IRC Channels: "
				     (mapconcat 'identity
						(rcirc-startup-channels server)
						" "))
			"[, ]+" t)))
	(rcirc-connect server port nick rcirc-user-name rcirc-user-full-name
		       channels))
    ;; make new connection using defaults unless already connected to
    ;; the default rcirc-server
    (let ((default-server (default-value 'rcirc-server))
	  connected)
      (dolist (p (rcirc-process-list))
	(when (string= default-server (process-name p))
	  (setq connected p)))
      (if (not connected)
	  (rcirc-connect rcirc-server rcirc-port rcirc-nick
			 rcirc-user-name rcirc-user-full-name
			 (rcirc-startup-channels rcirc-server))
	(switch-to-buffer (process-buffer connected))
	(message "Connected to %s" rcirc-server)))))
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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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(defun rcirc-connect (server port nick user-name full-name startup-channels)
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  (add-hook 'window-configuration-change-hook
	    'rcirc-window-configuration-change)
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  (save-excursion
    (message "Connecting to %s..." server)
    (let* ((inhibit-eol-conversion)
           (port-number (if (stringp port)
                            (string-to-number port)
                          port))
           (process (open-network-stream server nil server port-number)))
      ;; set up process
      (set-process-coding-system process 'raw-text 'raw-text)
      (set-process-filter process 'rcirc-filter)
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      (switch-to-buffer (rcirc-generate-new-buffer-name process nil))
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      (set-process-buffer process (current-buffer))
      (set-process-sentinel process 'rcirc-sentinel)
      (rcirc-mode process nil)
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      (make-local-variable 'rcirc-buffer-alist)
      (setq rcirc-buffer-alist nil)
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      (make-local-variable 'rcirc-nick-table)
      (setq rcirc-nick-table (make-hash-table :test 'equal))
      (make-local-variable 'rcirc-server)
      (setq rcirc-server server)
      (make-local-variable 'rcirc-nick)
      (setq rcirc-nick nick)
      (make-local-variable 'rcirc-process-output)
      (setq rcirc-process-output nil)
      (make-local-variable 'rcirc-startup-channels)
      (setq rcirc-startup-channels startup-channels)
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      (make-local-variable 'rcirc-last-server-message-time)
      (setq rcirc-last-server-message-time (current-time))
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      ;; identify
      (rcirc-send-string process (concat "NICK " nick))
      (rcirc-send-string process (concat "USER " user-name
                                      " hostname servername :"
                                      full-name))

      ;; setup ping timer if necessary
      (unless rcirc-keepalive-timer
        (setq rcirc-keepalive-timer
              (run-at-time 0 rcirc-keepalive-seconds 'rcirc-keepalive)))

      (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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(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
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		(if (> (cadr (time-since rcirc-last-server-message-time))
		       rcirc-keepalive-seconds)
		    (kill-process process)
		  (rcirc-send-string process (concat "PING " rcirc-server)))))
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            (rcirc-process-list))
    (cancel-timer rcirc-keepalive-timer)
    (setq rcirc-keepalive-timer nil)))

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(defvar rcirc-debug-buffer " *rcirc debug*")
(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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    (save-excursion
      (save-window-excursion
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        (set-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
			       (process-status process)) t)
	  ;; remove the prompt from buffers
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	  (let ((inhibit-read-only t))
	    (delete-region rcirc-prompt-start-marker
			   rcirc-prompt-end-marker)))))
    (run-hook-with-args 'rcirc-sentinel-hooks process sentinel)))

(defun rcirc-process-list ()
  "Return a list of rcirc processes."
  (let (ps)
    (mapc (lambda (p)
            (when (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)
  (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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(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)))

(defun rcirc-handler-generic (process command sender args text)
  "Generic server response handler."
  (rcirc-print process sender command nil
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               (mapconcat 'identity (cdr args) " ") t))
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(defun rcirc-send-string (process string)
  "Send PROCESS a STRING plus a newline."
  (let ((string (concat (encode-coding-string string
                                              buffer-file-coding-system)
                        "\n")))
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    (unless (eq (process-status rcirc-process) 'open)
      (error "Network connection to %s is not open"
             (process-name rcirc-process)))
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    (rcirc-debug process string)
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    (process-send-string process string)))

(defun rcirc-server (process)
  "Return PROCESS server, given by the 001 response."
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  (with-rcirc-process-buffer process
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    rcirc-server))

(defun rcirc-nick (process)
  "Return PROCESS nick."
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  (with-rcirc-process-buffer process
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    rcirc-nick))

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(defun rcirc-abbrev-nick (nick)
  "If NICK has an entry in `rcirc-nick-abbrevs', return its abbreviation,
otherwise return NICK."
  (or (cdr (assoc nick rcirc-nick-abbrevs)) nick))

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(defvar rcirc-max-message-length 450
  "Messages longer than this value will be split.")

(defun rcirc-send-message (process target message &optional noticep)
  "Send TARGET associated with PROCESS a privmsg with text MESSAGE.
If NOTICEP is non-nil, send a notice instead of privmsg."
  ;; 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)
    (rcirc-print process (rcirc-nick process) response target text)
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    (rcirc-send-string process (concat 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)
(defun rcirc-prev-input-string (arg)
  (ring-ref rcirc-input-ring (+ rcirc-input-ring-index arg)))

(defun rcirc-insert-prev-input (arg)
  (interactive "p")
  (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))))

(defun rcirc-insert-next-input (arg)
  (interactive "p")
  (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))))

(defvar rcirc-nick-completions nil)
(defvar rcirc-nick-completion-start-offset nil)
(defun rcirc-complete-nick ()
  "Cycle through nick completions from list of nicks in channel."
  (interactive)
  (if (eq last-command 'rcirc-complete-nick)
      (setq rcirc-nick-completions
            (append (cdr rcirc-nick-completions)
                    (list (car rcirc-nick-completions))))
    (setq rcirc-nick-completion-start-offset
          (- (save-excursion
               (if (re-search-backward " " rcirc-prompt-end-marker t)
                   (1+ (point))
                 rcirc-prompt-end-marker))
             rcirc-prompt-end-marker))
    (setq rcirc-nick-completions
          (let ((completion-ignore-case t))
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            (all-completions
	     (buffer-substring
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	      (+ rcirc-prompt-end-marker
		 rcirc-nick-completion-start-offset)
	      (point))
	     (mapcar (lambda (x) (cons x nil))
		     (rcirc-channel-nicks rcirc-process
					  (rcirc-buffer-target)))))))
  (let ((completion (car rcirc-nick-completions)))
    (when completion
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      (delete-region (+ rcirc-prompt-end-marker
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                        rcirc-nick-completion-start-offset)
                     (point))
      (insert (concat completion
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                      (if (= (+ rcirc-prompt-end-marker
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                                rcirc-nick-completion-start-offset)
                             rcirc-prompt-end-marker)
                          ": "))))))

(defun rcirc-buffer-target (&optional buffer)
  "Return the name of target for BUFFER.
If buffer is nil, return the target of the current buffer."
  (with-current-buffer (or buffer (current-buffer))
    rcirc-target))

(defvar rcirc-mode-map (make-sparse-keymap)
  "Keymap for rcirc mode.")

(define-key rcirc-mode-map (kbd "RET") 'rcirc-send-input)
(define-key rcirc-mode-map (kbd "M-p") 'rcirc-insert-prev-input)
(define-key rcirc-mode-map (kbd "M-n") 'rcirc-insert-next-input)
(define-key rcirc-mode-map (kbd "TAB") 'rcirc-complete-nick)
(define-key rcirc-mode-map (kbd "C-c C-b") 'rcirc-browse-url)
(define-key rcirc-mode-map (kbd "C-c C-c") 'rcirc-edit-multiline)
(define-key rcirc-mode-map (kbd "C-c C-j") 'rcirc-cmd-join)
(define-key rcirc-mode-map (kbd "C-c C-k") 'rcirc-cmd-kick)
(define-key rcirc-mode-map (kbd "C-c C-l") 'rcirc-cmd-list)
(define-key rcirc-mode-map (kbd "C-c C-d") 'rcirc-cmd-mode)
(define-key rcirc-mode-map (kbd "C-c C-m") 'rcirc-cmd-msg)
(define-key rcirc-mode-map (kbd "C-c C-r") 'rcirc-cmd-nick) ; rename
(define-key rcirc-mode-map (kbd "C-c C-o") 'rcirc-cmd-oper)
(define-key rcirc-mode-map (kbd "C-c C-p") 'rcirc-cmd-part)
(define-key rcirc-mode-map (kbd "C-c C-q") 'rcirc-cmd-query)
(define-key rcirc-mode-map (kbd "C-c C-t") 'rcirc-cmd-topic)
(define-key rcirc-mode-map (kbd "C-c C-n") 'rcirc-cmd-names)
(define-key rcirc-mode-map (kbd "C-c C-w") 'rcirc-cmd-whois)
(define-key rcirc-mode-map (kbd "C-c C-x") 'rcirc-cmd-quit)
(define-key rcirc-mode-map (kbd "C-c TAB") ; C-i
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  'rcirc-toggle-ignore-buffer-activity)
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(define-key rcirc-mode-map (kbd "C-c C-s") 'rcirc-switch-to-server-buffer)
(define-key rcirc-mode-map (kbd "C-c C-a") 'rcirc-jump-to-first-unread-line)

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(defvar rcirc-browse-url-map (make-sparse-keymap)
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  "Keymap used for browsing URLs in `rcirc-mode'.")
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(define-key rcirc-browse-url-map (kbd "RET") 'rcirc-browse-url-at-point)
(define-key rcirc-browse-url-map (kbd "<mouse-2>") 'rcirc-browse-url-at-mouse)

(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.")

(defun rcirc-mode (process target)
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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)

  (make-local-variable 'rcirc-input-ring)
  (setq rcirc-input-ring (make-ring rcirc-input-ring-size))
  (make-local-variable 'rcirc-process)
  (setq rcirc-process process)
  (make-local-variable 'rcirc-target)
  (setq rcirc-target target)
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  (make-local-variable 'rcirc-topic)
  (setq rcirc-topic nil)
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  (make-local-variable 'rcirc-short-buffer-name)
  (setq rcirc-short-buffer-name nil)
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  (make-local-variable 'rcirc-urls)
  (setq rcirc-urls nil)
  (setq use-hard-newlines t)

  ;; setup the prompt and markers
  (make-local-variable 'rcirc-prompt-start-marker)
  (setq rcirc-prompt-start-marker (make-marker))
  (set-marker rcirc-prompt-start-marker (point-max))
  (make-local-variable 'rcirc-prompt-end-marker)
  (setq rcirc-prompt-end-marker (make-marker))
  (set-marker rcirc-prompt-end-marker (point-max))
  (rcirc-update-prompt)
  (goto-char rcirc-prompt-end-marker)
  (make-local-variable 'overlay-arrow-position)
  (setq overlay-arrow-position (make-marker))
  (set-marker overlay-arrow-position nil)

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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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  (run-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
		    (replace-regexp-in-string (car rep) (regexp-quote (cdr rep)) prompt)))
	    (list (cons "%n" (with-rcirc-process-buffer rcirc-process
			       rcirc-nick))
		  (cons "%s" (with-rcirc-process-buffer rcirc-process
			       rcirc-server))
		  (cons "%t" (or rcirc-target ""))))
      (save-excursion
	(delete-region rcirc-prompt-start-marker rcirc-prompt-end-marker)
	(goto-char rcirc-prompt-start-marker)
	(let ((start (point)))
	  (insert-before-markers prompt)
	  (set-marker rcirc-prompt-start-marker start)
	  (when (not (zerop (- rcirc-prompt-end-marker
			       rcirc-prompt-start-marker)))
	    (add-text-properties rcirc-prompt-start-marker
				 rcirc-prompt-end-marker
				 (list 'face 'rcirc-prompt
				       'read-only t 'field t
				       'front-sticky t 'rear-nonsticky t))))))))

(defun rcirc-set-changed (option value)
  "Set OPTION to VALUE and do updates after a customization change."
  (set-default option value)
  (cond ((eq option 'rcirc-prompt)
	 (rcirc-update-prompt 'all))
	(t
	 (error "Bad option %s" option))))
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(defun rcirc-channel-p (target)
  "Return t if TARGET is a channel name."
  (and target
       (not (zerop (length target)))
       (or (eq (aref target 0) ?#)
           (eq (aref target 0) ?&))))

(defun rcirc-kill-buffer-hook ()
  "Part the channel when killing an rcirc buffer."
  (when (eq major-mode 'rcirc-mode)
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    (rcirc-kill-buffer-hook-1)))
(defun rcirc-kill-buffer-hook-1 ()
  (let ((buffer (current-buffer)))
    (rcirc-clear-activity buffer)
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    (when (and rcirc-process
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	       (eq (process-status rcirc-process) 'open))
      (with-rcirc-process-buffer rcirc-process
	(setq rcirc-buffer-alist
	      (rassq-delete-all buffer rcirc-buffer-alist)))
      (rcirc-update-short-buffer-names)
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      (if (rcirc-channel-p rcirc-target)
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	  (rcirc-send-string rcirc-process
			     (concat "PART " rcirc-target
				     " :Killed buffer"))
	(when rcirc-target
	  (rcirc-remove-nick-channel rcirc-process
				     (rcirc-nick rcirc-process)
				     rcirc-target))))))

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(add-hook 'kill-buffer-hook 'rcirc-kill-buffer-hook)

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(defun rcirc-generate-new-buffer-name (process target)
  "Return a buffer name based on PROCESS and TARGET.
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This is used for the initial name given to IRC buffers."
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  (if target
      (concat target "@" (process-name process))
    (concat "*" (process-name process) "*")))
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(defun rcirc-get-buffer (process target &optional server)
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  "Return the buffer associated with the PROCESS and TARGET.
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If optional argument SERVER is non-nil, return the server buffer
if there is no existing buffer for TARGET, otherwise return nil."
  (with-rcirc-process-buffer process
    (if (null target)
	(current-buffer)
      (let ((buffer (cdr (assoc-string target rcirc-buffer-alist t))))
	(or buffer (when server (current-buffer)))))))
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(defun rcirc-get-buffer-create (process target)
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  "Return the buffer associated with the PROCESS and TARGET.
Create the buffer if it doesn't exist."
  (let ((buffer (rcirc-get-buffer process target)))
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    (if buffer
	(progn
	  (when (not rcirc-target)
	    (setq rcirc-target target))
	  buffer)
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	;; create the buffer
	(with-rcirc-process-buffer process
	  (let ((new-buffer (get-buffer-create
			     (rcirc-generate-new-buffer-name process target))))
	    (with-current-buffer new-buffer
	      (rcirc-mode process target))
	    (rcirc-put-nick-channel process (rcirc-nick process) target)
	    new-buffer)))))
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(defun rcirc-send-input ()
  "Send input to target associated with the current buffer."
  (interactive)
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  (if (< (point) rcirc-prompt-end-marker)
      ;; copy the line down to the input area
      (progn
	(forward-line 0)
	(let ((start (if (eq (point) (point-min))
			 (point)
		       (if (get-text-property (1- (point)) 'hard)
			   (point)
			 (previous-single-property-change (point) 'hard))))
	      (end (next-single-property-change (1+ (point)) 'hard)))
	  (goto-char (point-max))
	  (insert (replace-regexp-in-string
		   "\n\\s-+" " "
		   (buffer-substring-no-properties start end)))))
    ;; process input
    (goto-char (point-max))
    (let ((target (rcirc-buffer-target))
	  (start rcirc-prompt-end-marker))
      (when (not (equal 0 (- (point) start)))
	;; delete a trailing newline
	(when (eq (point) (point-at-bol))
	  (delete-backward-char 1))
	(let ((input (buffer-substring-no-properties
		      rcirc-prompt-end-marker (point))))
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	  (dolist (line (split-string input "\n"))
	    (rcirc-process-input-line rcirc-process target line))
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	  ;; add to input-ring
	  (save-excursion
	    (ring-insert rcirc-input-ring input)
	    (setq rcirc-input-ring-index 0)))))))
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(defun rcirc-process-input-line (process target line)
  (if (string-match "^/\\([^ ]+\\) ?\\(.*\\)$" line)
      (rcirc-process-command (match-string 1 line)
			     (match-string 2 line)
			     line)
    (rcirc-process-message line)))

(defun rcirc-process-message (line)
  (if (not rcirc-target)
      (message "Not joined")
    (delete-region rcirc-prompt-end-marker (point))
    (rcirc-send-message rcirc-process rcirc-target line)))

(defun rcirc-process-command (command args line)
  (if (eq (aref command 0) ?/)
      ;; "//text" will send "/text" as a message
      (rcirc-process-message (substring line 1))
    (let* ((fun (intern-soft (concat "rcirc-cmd-" command))))
      (newline)
      (with-current-buffer (current-buffer)
	(delete-region rcirc-prompt-end-marker (point))
	(if (string= command "me")
	    (rcirc-print rcirc-process (rcirc-nick rcirc-process)
			 "ACTION" rcirc-target args)
	  (rcirc-print rcirc-process (rcirc-nick rcirc-process)
		       "COMMAND" rcirc-target line))
	(set-marker rcirc-prompt-end-marker (point))
	(if (fboundp fun)
	    (funcall fun args rcirc-process rcirc-target)
	  (rcirc-send-string rcirc-process
			     (concat command " " args)))))))

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(defvar rcirc-parent-buffer nil)
(defvar rcirc-window-configuration nil)
(defun rcirc-edit-multiline ()
  "Move current edit to a dedicated buffer."
  (interactive)
  (let ((pos (1+ (- (point) rcirc-prompt-end-marker))))
    (goto-char (point-max))
    (let ((text (buffer-substring rcirc-prompt-end-marker (point)))
          (parent (buffer-name))
          (process rcirc-process))
      (delete-region rcirc-prompt-end-marker (point))
      (setq rcirc-window-configuration (current-window-configuration))
      (pop-to-buffer (concat "*multiline " parent "*"))
      (rcirc-multiline-edit-mode)
      (setq rcirc-parent-buffer parent)
      (setq rcirc-process process)
      (insert text)
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      (and (> pos 0) (goto-char pos))
      (message "Type C-c C-c to return text to %s, or C-c C-k to cancel" parent))))
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(define-derived-mode rcirc-multiline-edit-mode
  text-mode "rcirc multi"
  "Major mode for multiline edits
\\{rcirc-multiline-edit-mode-map}"
  (make-local-variable 'rcirc-parent-buffer)
  (make-local-variable 'rcirc-process))

(define-key rcirc-multiline-edit-mode-map
  (kbd "C-c C-c") 'rcirc-multiline-edit-submit)
(define-key rcirc-multiline-edit-mode-map
  (kbd "C-x C-s") 'rcirc-multiline-edit-submit)
(define-key rcirc-multiline-edit-mode-map
  (kbd "C-c C-k") 'rcirc-multiline-edit-cancel)
(define-key rcirc-multiline-edit-mode-map
  (kbd "ESC ESC ESC") 'rcirc-multiline-edit-cancel)

(defun rcirc-multiline-edit-submit ()
  "Send the text in buffer back to parent buffer."
  (interactive)
  (assert (and (eq major-mode 'rcirc-multiline-edit-mode)))
  (assert rcirc-parent-buffer)
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  (untabify (point-min) (point-max))
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  (let ((text (buffer-substring (point-min) (point-max)))
        (buffer (current-buffer))
        (pos (point)))
    (set-buffer rcirc-parent-buffer)
    (goto-char (point-max))
    (insert text)
    (kill-buffer buffer)
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    (set-window-configuration rcirc-window-configuration)
    (goto-char (+ rcirc-prompt-end-marker (1- pos)))))
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(defun rcirc-multiline-edit-cancel ()
  "Cancel the multiline edit."
  (interactive)
  (assert (and (eq major-mode 'rcirc-multiline-edit-mode)))
  (kill-buffer (current-buffer))
  (set-window-configuration rcirc-window-configuration))

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(defun rcirc-get-any-buffer (process)
  "Return a buffer for PROCESS, either the one selected or the process buffer."
  (let ((buffer (window-buffer (selected-window))))
    (if (and buffer
	     (with-current-buffer buffer
	       (and (eq major-mode 'rcirc-mode)
		    (eq rcirc-process process))))
	buffer
      (process-buffer process))))
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(defcustom rcirc-response-formats
  '(("PRIVMSG" . "%T<%n> %m")
    ("NOTICE"  . "%T-%n- %m")
    ("ACTION"  . "%T[%n] %m")
    ("COMMAND" . "%T%m")
    ("ERROR"   . "%T%fw!!! %m")
    (t         . "%T%fp*** %fs%n %r %m"))
  "An alist of formats used for printing responses.
The format is looked up using the response-type as a key;
if no match is found, the default entry (with a key of `t') is used.

The entry's value part should be a string, which is inserted with
the of the following escape sequences replaced by the described values:

  %m        The message text
  %n        The sender's nick (with face `rcirc-my-nick' or `rcirc-other-nick')
  %r        The response-type
  %T        The timestamp (with face `rcirc-timestamp')
  %t        The target
  %fw       Following text uses the face `font-lock-warning-face'
  %fp       Following text uses the face `rcirc-server-prefix'
  %fs       Following text uses the face `rcirc-server'
  %f[FACE]  Following text uses the face FACE
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  %f-       Following text uses the default face
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  %%        A literal `%' character
"
  :type '(alist :key-type (choice (string :tag "Type")
				  (const :tag "Default" t))
		:value-type string)
  :group 'rcirc)

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(defun rcirc-format-response-string (process sender response target text)
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  "Return a nicely-formatted response string, incorporating TEXT
\(and perhaps other arguments).  The specific formatting used
is found by looking up RESPONSE in `rcirc-response-formats'."
  (let ((chunks
	 (split-string (or (cdr (assoc response rcirc-response-formats))
			   (cdr (assq t rcirc-response-formats)))
		       "%"))
	(result "")
	(face nil)
	key face-key repl)
    (when (equal (car chunks) "")
      (pop chunks))
    (dolist (chunk chunks)
      (if (equal chunk "")
	  (setq key ?%)
	(setq key (aref chunk 0))
	(setq chunk (substring chunk 1)))
      (setq repl
	    (cond ((eq key ?%)
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		   ;; %% -- literal % character
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		   "%")
		  ((eq key ?n)
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		   ;; %n -- nick
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		   (rcirc-facify (concat (rcirc-abbrev-nick sender)
					 (and target (concat "," target)))
				 (if (string= sender (rcirc-nick process))
				     'rcirc-my-nick
				   'rcirc-other-nick)))
		  ((eq key ?T)
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		   ;; %T -- timestamp
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		   (rcirc-facify
		    (format-time-string rcirc-time-format (current-time))
		    'rcirc-timestamp))
		  ((eq key ?m)
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		   ;; %m -- message text
		   ;; We add the text property `rcirc-text' to identify this
		   ;; as the body text.
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		   (propertize
		    (rcirc-mangle-text process (rcirc-facify text face))
		    'rcirc-text text))
		  ((eq key ?t)
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		   ;; %t -- target
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		   (rcirc-facify (or rcirc-target "") face))
		  ((eq key ?r)
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		   ;; %r -- response
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		   (rcirc-facify response face))
		  ((eq key ?f)
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		   ;; %f -- change face
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		   (setq face-key (aref chunk 0))
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		   (setq chunk (substring chunk 1))
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		   (cond ((eq face-key ?w)
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			  ;; %fw -- warning face
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			  (setq face 'font-lock-warning-face))
			 ((eq face-key ?p)
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			  ;; %fp -- server-prefix face
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			  (setq face 'rcirc-server-prefix))
			 ((eq face-key ?s)
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			  ;; %fs -- warning face
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			  (setq face 'rcirc-server))
			 ((eq face-key ?-)
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			  ;; %fs -- warning face
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			  (setq face nil))
			 ((and (eq face-key ?\[)
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			       (string-match "^\\([^]]*\\)[]]" chunk)
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			       (facep (match-string 1 chunk)))
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			  ;; %f[...] -- named face
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			  (setq face (intern (match-string 1 chunk)))
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			  (setq chunk (substring chunk (match-end 0)))))
		   "")))
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      (setq result (concat result repl (rcirc-facify chunk face))))
    result))
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(defun rcirc-target-buffer (process sender response target text)
  "Return a buffer to print the server response."
  (assert (not (bufferp target)))
  (with-rcirc-process-buffer process
    (cond ((not target)
	   (if rcirc-always-use-server-buffer-flag
	       (process-buffer process)
	     (rcirc-get-any-buffer process)))
	  ((not (rcirc-channel-p target))
	   ;; message from another user
	   (if (string= response "PRIVMSG")
	       (rcirc-get-buffer-create process (if (string= sender rcirc-nick)
						    target
						  sender))
	     (rcirc-get-buffer process target t)))
	  ((or (rcirc-get-buffer process target)
	       (rcirc-get-any-buffer process))))))

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(defvar rcirc-activity-type nil)
(make-variable-buffer-local 'rcirc-activity-type)
(defun rcirc-print (process sender response target text &optional activity)
  "Print TEXT in the buffer associated with TARGET.
Format based on SENDER and RESPONSE.  If ACTIVITY is non-nil,
record activity."
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  (unless (or (member sender rcirc-ignore-list)
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	      (member (with-syntax-table rcirc-nick-syntax-table
			(when (string-match "^\\([^/]\\w*\\)[:,]" text)
			  (match-string 1 text))) rcirc-ignore-list))
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    (let* ((buffer (rcirc-target-buffer process sender response target text))
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	   (inhibit-read-only t))
      (with-current-buffer buffer
	(let ((moving (= (point) rcirc-prompt-end-marker))
	      (old-point (point-marker))
	      (fill-start (marker-position rcirc-prompt-start-marker)))

	  (unless (string= sender (rcirc-nick process))
	    ;; only decode text from other senders, not ours
	    (setq text (decode-coding-string (or text "")
					     buffer-file-coding-system))
	    ;; mark the line with overlay arrow
	    (unless (or (marker-position overlay-arrow-position)
			(get-buffer-window (current-buffer)))
	      (set-marker overlay-arrow-position
			  (marker-position rcirc-prompt-start-marker))))

	  ;; temporarily set the marker insertion-type because
	  ;; insert-before-markers results in hidden text in new buffers
	  (goto-char rcirc-prompt-start-marker)
	  (set-marker-insertion-type rcirc-prompt-start-marker t)
	  (set-marker-insertion-type rcirc-prompt-end-marker t)
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	  (let ((fmted-text
		 (rcirc-format-response-string process sender response nil
					       text)))

	    (insert fmted-text (propertize "\n" 'hard t))
	    (set-marker-insertion-type rcirc-prompt-start-marker nil)
	    (set-marker-insertion-type rcirc-prompt-end-marker nil)

	    ;; fill the text we just inserted, maybe
	    (when (and rcirc-fill-flag
		       (not (string= response "372"))) ;/motd
	      (let ((fill-prefix
		     (or rcirc-fill-prefix
			 (make-string
			  (or (next-single-property-change 0 'rcirc-text
							   fmted-text)
			      8)
			  ?\s)))
		    (fill-column (cond ((eq rcirc-fill-column 'frame-width)
					(1- (frame-width)))
				       (rcirc-fill-column
					rcirc-fill-column)
				       (t fill-column))))
		(fill-region fill-start rcirc-prompt-start-marker 'left t))))
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	  ;; set inserted text to be read-only
	  (when rcirc-read-only-flag
	    (put-text-property rcirc-prompt-start-marker fill-start 'read-only t)
	    (let ((inhibit-read-only t))
	      (put-text-property rcirc-prompt-start-marker fill-start
				 'front-sticky t)
	      (put-text-property (1- (point)) (point) 'rear-nonsticky t)))

	  ;; truncate buffer if it is very long
	  (save-excursion
	    (when (and rcirc-buffer-maximum-lines
		       (> rcirc-buffer-maximum-lines 0)
		       (= (forward-line (- rcirc-buffer-maximum-lines)) 0))
	      (delete-region (point-min) (point))))

	  ;; set the window point for buffers show in windows
	  (walk-windows (lambda (w)
			  (unless (eq (selected-window) w)
			    (when (and (eq (current-buffer)
					   (window-buffer w))
				       (>= (window-point w)
					   rcirc-prompt-end-marker))
			      (set-window-point w (point-max)))))
			nil t)

	  ;; restore the point
	  (goto-char (if moving rcirc-prompt-end-marker old-point))

	  ;; flush undo (can we do something smarter here?)
	  (buffer-disable-undo)
	  (buffer-enable-undo))

	;; record modeline activity
	(when activity
	  (let ((nick-match
		 (string-match (concat "\\b"
				       (regexp-quote (rcirc-nick process))
				       "\\b")
			       text)))
	    (when (or (not rcirc-ignore-buffer-activity-flag)
		      ;; always notice when our nick is mentioned, even
		      ;; if ignoring channel activity
		      nick-match)
	      (rcirc-record-activity
	       (current-buffer)
	       (when (or nick-match (not (rcirc-channel-p rcirc-target)))
		 'nick)))))

	(sit-for 0)			; displayed text before hook
	(run-hook-with-args 'rcirc-print-hooks
			    process sender response target text)))))
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(defun rcirc-startup-channels (server)
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  "Return the list of startup channels for SERVER."
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  (let (channels)
    (dolist (i rcirc-startup-channels-alist)
      (if (string-match (car i) server)
          (setq channels (append channels (cdr i)))))
    channels))

(defun rcirc-join-channels (process channels)
  "Join CHANNELS."
  (save-window-excursion
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    (dolist (channel channels)
      (with-rcirc-process-buffer process
	(rcirc-cmd-join channel process)))))
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;;; nick management
(defun rcirc-user-nick (user)
  "Return the nick from USER.  Remove any non-nick junk."
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  (save-match-data
    (if (string-match "^[@%+]?\\([^! ]+\\)!?" (or user ""))
	(match-string 1 user)
      user)))
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(defun rcirc-user-non-nick (user)
  "Return the non-nick portion of USER."
  (if (string-match "^[@+]?[^! ]+!?\\(.*\\)" (or user ""))
      (match-string 1 user)
    user))

(defun rcirc-nick-channels (process nick)
  "Return list of channels for NICK."
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  (with-rcirc-process-buffer process
    (mapcar (lambda (x) (car x))
	    (gethash nick rcirc-nick-table))))
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(defun rcirc-put-nick-channel (process nick channel)
  "Add CHANNEL to list associated with NICK."
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  (with-rcirc-process-buffer process
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    (let* ((chans (gethash nick rcirc-nick-table))
	   (record (assoc-string channel chans t)))
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      (if record
          (setcdr record (current-time))
        (puthash nick (cons (cons channel (current-time))
                            chans)
                 rcirc-nick-table)))))

(defun rcirc-nick-remove (process nick)
  "Remove NICK from table."
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  (with-rcirc-process-buffer process
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    (remhash nick rcirc-nick-table)))

(defun rcirc-remove-nick-channel (process nick channel)
  "Remove the CHANNEL from list associated with NICK."
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  (with-rcirc-process-buffer process
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    (let* ((chans (gethash nick rcirc-nick-table))
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           (newchans
	    ;; instead of assoc-string-delete-all:
	    (let ((record (assoc-string channel chans t)))
	      (when record
		(setcar record 'delete)
		(assq-delete-all 'delete chans)))))
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      (if newchans
          (puthash nick newchans rcirc-nick-table)
        (remhash nick rcirc-nick-table)))))

(defun rcirc-channel-nicks (process channel)
  "Return the list of nicks in CHANNEL sorted by last activity."
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  (with-rcirc-process-buffer process
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    (let (nicks)
      (maphash
       (lambda (k v)
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         (let ((record (assoc-string channel v t)))
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           (if record
               (setq nicks (cons (cons k (cdr record)) nicks)))))
       rcirc-nick-table)
      (mapcar (lambda (x) (car x))
              (sort nicks (lambda (x y) (time-less-p (cdr y) (cdr x))))))))
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(defun rcirc-ignore-update-automatic (nick)
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  "Remove NICK from `rcirc-ignore-list'
if NICK is also on `rcirc-ignore-list-automatic'."
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  (when (member nick rcirc-ignore-list-automatic)
      (setq rcirc-ignore-list-automatic
	    (delete nick rcirc-ignore-list-automatic)
	    rcirc-ignore-list
	    (delete nick rcirc-ignore-list))))
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;;; activity tracking
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(defvar rcirc-track-minor-mode-map (make-sparse-keymap)
  "Keymap for rcirc track minor mode.")

(define-key rcirc-track-minor-mode-map (kbd "C-c `") 'rcirc-next-active-buffer)
(define-key rcirc-track-minor-mode-map (kbd "C-c C-@") 'rcirc-next-active-buffer)
(define-key rcirc-track-minor-mode-map (kbd "C-c C-SPC") 'rcirc-next-active-buffer)

;;; FIXME: the code to insert `rcirc-activity-string' into
;;; `global-mode-string' isn't called when the mode is activated by
;;; customize.  I don't know how to set that up.
(define-minor-mode rcirc-track-minor-mode
  "Global minor mode for tracking activity in rcirc buffers."
  :init-value nil
  :lighter ""
  :keymap rcirc-track-minor-mode-map
  :global t
  :group 'rcirc
  (or global-mode-string (setq global-mode-string '("")))
  ;; toggle the mode-line channel indicator
  (if rcirc-track-minor-mode
      (and (not (memq 'rcirc-activity-string global-mode-string))
	   (setq global-mode-string
		 (append global-mode-string '(rcirc-activity-string))))
    (setq global-mode-string 
	  (delete 'rcirc-activity-string global-mode-string))))

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(or (assq 'rcirc-ignore-buffer-activity-flag minor-mode-alist)
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    (setq minor-mode-alist
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          (cons '(rcirc-ignore-buffer-activity-flag " Ignore") minor-mode-alist)))
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(defun rcirc-toggle-ignore-buffer-activity ()
  "Toggle the value of `rcirc-ignore-buffer-activity-flag'."
  (interactive)
  (setq rcirc-ignore-buffer-activity-flag
	(not rcirc-ignore-buffer-activity-flag))
  (message (if rcirc-ignore-buffer-activity-flag
	       "Ignore activity in this buffer"
	     "Notice activity in this buffer"))
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  (force-mode-line-update))

(defvar rcirc-switch-to-buffer-function 'switch-to-buffer
  "Function to use when switching buffers.
Possible values are `switch-to-buffer', `pop-to-buffer', and
`display-buffer'.")

(defun rcirc-switch-to-server-buffer ()
  "Switch to the server buffer associated with current channel buffer."
  (interactive)
  (funcall rcirc-switch-to-buffer-function (process-buffer rcirc-process)))

(defun rcirc-jump-to-first-unread-line ()
  "Move the point to the first unread line in this buffer."
  (interactive)
  (when (marker-position overlay-arrow-position)
    (goto-char overlay-arrow-position)))

(defvar rcirc-last-non-irc-buffer nil
  "The buffer to switch to when there is no more activity.")

(defun rcirc-next-active-buffer (arg)
  "Go to the ARGth rcirc buffer with activity.
The function given by `rcirc-switch-to-buffer-function' is used to
show the buffer."
  (interactive "p")
  (if rcirc-activity
      (progn
        (unless (eq major-mode 'rcirc-mode)
          (setq rcirc-last-non-irc-buffer (current-buffer)))
        (if (and (> arg 0)
                 (<= arg (length rcirc-activity)))
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            (funcall rcirc-switch-to-buffer-function
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		     (nth (1- arg) rcirc-activity))
          (message "Invalid arg: %d" arg)))
    (if (eq major-mode 'rcirc-mode)
        (if (not (and rcirc-last-non-irc-buffer
                      (buffer-live-p rcirc-last-non-irc-buffer)))
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            (message "No IRC activity.  Start something.")
	  (message "No more IRC activity.  Go back to work.")
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          (funcall rcirc-switch-to-buffer-function rcirc-last-non-irc-buffer)
          (setq rcirc-last-non-irc-buffer nil))
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      (message "No IRC activity."))))
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(defvar rcirc-activity-hooks nil
  "Hook to be run when there is channel activity.

Functions are called with a single argument, the buffer with the
activity.  Only run if the buffer is not visible and
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`rcirc-ignore-buffer-activity-flag' is non-nil.")
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(defun rcirc-record-activity (buffer type)
  "Record BUFFER activity with TYPE."
  (with-current-buffer buffer
    (when (not (get-buffer-window (current-buffer) t))
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      (add-to-list 'rcirc-activity (current-buffer))
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      (if (not rcirc-activity-type)
          (setq rcirc-activity-type type))
      (rcirc-update-activity-string)))
  (run-hook-with-args 'rcirc-activity-hooks buffer))

(defun rcirc-clear-activity (buffer)
  "Clear the BUFFER activity."
  (setq rcirc-activity (delete buffer rcirc-activity))
  (with-current-buffer buffer
    (setq rcirc-activity-type nil)))

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;; TODO: add mouse properties
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(defun rcirc-update-activity-string ()
  "Update mode-line string."
  (setq rcirc-activity-string
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	(if (not rcirc-activity)
	       ""
	  (concat " ["
		  (mapconcat
		   (lambda (b)
		     (let ((s (rcirc-short-buffer-name b)))
		       (with-current-buffer b
			 (if (not (eq rcirc-activity-type 'nick))
			     s
			   (rcirc-facify s 'rcirc-mode-line-nick)))))
		   rcirc-activity ",")
		  "]"))))
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(defun rcirc-short-buffer-name (buffer)
  "Return a short name for BUFFER to use in the modeline indicator."
  (with-current-buffer buffer
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    (or rcirc-short-buffer-name (buffer-name))))

(defvar rcirc-current-buffer nil)
(defun rcirc-window-configuration-change ()
  "Go through visible windows and remove buffers from activity list.
Also, clear the overlay arrow if the current buffer is now hidden."
  (let ((current-now-hidden t))
    (walk-windows (lambda (w)
		    (let ((buf (window-buffer w)))
		      (rcirc-clear-activity buf)
		      (when (eq buf rcirc-current-buffer)
			(setq current-now-hidden nil)))))
    (when (and rcirc-current-buffer current-now-hidden)
      (with-current-buffer rcirc-current-buffer
	(when (eq major-mode 'rcirc-mode)
	  (marker-position overlay-arrow-position)
	  (set-marker overlay-arrow-position nil)))))

  ;; remove any killed buffers from list
  (setq rcirc-activity
	(delq nil (mapcar (lambda (buf) (when (buffer-live-p buf) buf))
			  rcirc-activity)))
  (rcirc-update-activity-string)
  (setq rcirc-current-buffer (current-buffer)))
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;;; buffer name abbreviation
(defun rcirc-update-short-buffer-names ()
  (let ((bufalist
	 (apply 'append (mapcar (lambda (process)
				  (with-rcirc-process-buffer process
				    rcirc-buffer-alist))
				(rcirc-process-list)))))
    (dolist (i (rcirc-abbreviate bufalist))
      (with-current-buffer (cdr i)
	(setq rcirc-short-buffer-name (car i))))))

(defun rcirc-abbreviate (pairs)
  (apply 'append (mapcar 'rcirc-rebuild-tree (rcirc-make-trees pairs))))

(defun rcirc-rebuild-tree (tree &optional acc)
  (let ((ch (char-to-string (car tree))))
    (dolist (x (cdr tree))
      (if (listp x)
	  (setq acc (append acc
			   (mapcar (lambda (y)
				     (cons (concat ch (car y))
					   (cdr y)))
				   (rcirc-rebuild-tree x))))
	(setq acc (cons (cons ch x) acc))))
    acc))

(defun rcirc-make-trees (pairs)
  (let (alist)
    (mapc (lambda (pair)
	    (if (consp pair)
		(let* ((str (car pair))
		       (data (cdr pair))
		       (char (unless (zerop (length str))
			       (aref str 0)))
		       (rest (unless (zerop (length str))
			       (substring str 1)))
		       (part (if char (assq char alist))))
		  (if part
		      ;; existing partition
		      (setcdr part (cons (cons rest data) (cdr part)))
		    ;; new partition
		    (setq alist (cons (if char
					  (list char (cons rest data))
					data)
				      alist))))
	      (setq alist (cons pair alist))))
	  pairs)
    ;; recurse into cdrs of alist
    (mapc (lambda (x)
	    (when (and (listp x) (listp (cadr x)))
	      (setcdr x (if (> (length (cdr x)) 1)
			    (rcirc-make-trees (cdr x))
			  (setcdr x (list (cdadr x)))))))
	  alist)))

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;;; /commands these are called with 3 args: PROCESS, TARGET, which is
;; the current buffer/channel/user, and ARGS, which is a string
;; containing the text following the /cmd.

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(defmacro defun-rcirc-command (command argument docstring interactive-form
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                                       &rest body)
  "Define a command."
  `(defun ,(intern (concat "rcirc-cmd-" (symbol-name command)))
     (,@argument &optional process target)
     ,(concat docstring "\n\nNote: If PROCESS or TARGET are nil, the values of"
              "\nbuffer local variables `rcirc-process' and `rcirc-target',"
              "\nwill be used.")
     ,interactive-form
     (let ((process (or process rcirc-process))
           (target (or target rcirc-target)))
       ,@body)))

(defun-rcirc-command msg (message)
  "Send private MESSAGE to TARGET."
  (interactive "i")
  (if (null message)
      (progn
        (setq target (completing-read "Message nick: "
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                                      (with-rcirc-process-buffer rcirc-process
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                                        rcirc-nick-table)))
        (when (> (length target) 0)
          (setq message (read-string (format "Message %s: " target)))
          (when (> (length message) 0)
            (rcirc-send-message process target message))))
    (if (not (string-match "\\([^ ]+\\) \\(.+\\)" message))
        (message "Not enough args, or something.")
      (setq target (match-string 1 message)
            message (match-string 2 message))
      (rcirc-send-message process target message))))

(defun-rcirc-command query (nick)
  "Open a private chat buffer to NICK."
  (interactive (list (completing-read "Query nick: "
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                                      (with-rcirc-process-buffer rcirc-process
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                                        rcirc-nick-table))))
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  (let ((existing-buffer (rcirc-get-buffer process nick)))
    (switch-to-buffer (or existing-buffer
			  (rcirc-get-buffer-create process nick)))
    (when (not existing-buffer)
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      (rcirc-cmd-whois nick))))

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(defun-rcirc-command join (channel)
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  "Join CHANNEL."
  (interactive "sJoin channel: ")
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  (let ((buffer (rcirc-get-buffer-create process
                                         (car (split-string channel)))))
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    (when (not (eq (selected-window) (minibuffer-window)))
      (funcall rcirc-switch-to-buffer-function buffer))
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    (rcirc-send-string process (concat "JOIN " channel))))
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(defun-rcirc-command part (channel)
  "Part CHANNEL."
  (interactive "sPart channel: ")
  (let ((channel (if (> (length channel) 0) channel target)))
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    (rcirc-send-string process (concat "PART " channel " :" rcirc-id-string))))
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(defun-rcirc-command quit (reason)
  "Send a quit message to server with REASON."
  (interactive "sQuit reason: ")
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  (rcirc-send-string process (concat "QUIT :"
				     (if (not (zerop (length reason)))
					 reason
				       rcirc-id-string))))
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(defun-rcirc-command nick (nick)
  "Change nick to NICK."
  (interactive "i")
  (when (null nick)
    (setq nick (read-string "New nick: " (rcirc-nick process))))
  (rcirc-send-string process (concat "NICK " nick)))

(defun-rcirc-command names (channel)
  "Display list of names in CHANNEL or in current channel if CHANNEL is nil.
If called interactively, prompt for a channel when prefix arg is supplied."
  (interactive "P")
  (if (interactive-p)
      (if channel
          (setq channel (read-string "List names in channel: " target))))
  (let ((channel (if (> (length channel) 0)
                     channel
                   target)))
    (rcirc-send-string process (concat "NAMES " channel))))

(defun-rcirc-command topic (topic)
  "List TOPIC for the TARGET channel.
With a prefix arg, prompt for new topic."
  (interactive "P")
  (if (and (interactive-p) topic)
      (setq topic (read-string "New Topic: " rcirc-topic)))
  (rcirc-send-string process (concat "TOPIC " target
                                     (when (> (length topic) 0)
                                       (concat " :" topic)))))

(defun-rcirc-command whois (nick)
  "Request information from server about NICK."
  (interactive (list
                (completing-read "Whois: "
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                                 (with-rcirc-process-buffer rcirc-process
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                                   rcirc-nick-table))))
  (rcirc-send-string process (concat "WHOIS " nick)))

(defun-rcirc-command mode (args)
  "Set mode with ARGS."
  (interactive (list (concat (read-string "Mode nick or channel: ")
                             " " (read-string "Mode: "))))
  (rcirc-send-string process (concat "MODE " args)))

(defun-rcirc-command list (channels)
  "Request information on CHANNELS from server."
  (interactive "sList Channels: ")
  (rcirc-send-string process (concat "LIST " channels)))

(defun-rcirc-command oper (args)
  "Send operator command to server."
  (interactive "sOper args: ")
  (rcirc-send-string process (concat "OPER " args)))

(defun-rcirc-command quote (message)
  "Send MESSAGE literally to server."
  (interactive "sServer message: ")
  (rcirc-send-string process message))

(defun-rcirc-command kick (arg)
  "Kick NICK from current channel."
  (interactive (list
                (concat (completing-read "Kick nick: "
                                         (rcirc-channel-nicks rcirc-process
                                                              rcirc-target))
                        (read-from-minibuffer "Kick reason: "))))
  (let* ((arglist (split-string arg))
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         (argstring (concat (car arglist) " :"
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                            (mapconcat 'identity (cdr arglist) " "))))
    (rcirc-send-string process (concat "KICK " target " " argstring))))

(defun rcirc-cmd-ctcp (args &optional process target)
  (if (string-match "^\\([^ ]+\\)\\s-+\\(.+\\)$" args)
      (let ((target (match-string 1 args))
            (request (match-string 2 args)))
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        (rcirc-send-string process
			   (format "PRIVMSG %s \C-a%s\C-a"
				   target (upcase request))))
    (rcirc-print process (rcirc-nick process) "ERROR" nil
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                 "usage: /ctcp NICK REQUEST")))

(defun rcirc-cmd-me (args &optional process target)
  (rcirc-send-string process (format "PRIVMSG %s :\C-aACTION %s\C-a"
                                     target args)))
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(defun-rcirc-command ignore (nick)
  "Manage the ignore list.
Ignore NICK, unignore NICK if already ignored, or list ignored
nicks when no NICK is given.  When listing ignored nicks, the
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ones added to the list automatically are marked with an asterisk."
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  (interactive "sToggle ignoring of nick: ")
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  (when (not (string= "" nick))
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    (if (member nick rcirc-ignore-list)
	(setq rcirc-ignore-list (delete nick rcirc-ignore-list))
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      (setq rcirc-ignore-list (cons nick rcirc-ignore-list))))
  (rcirc-print process (rcirc-nick process) "IGNORE" target 
	       (mapconcat
		(lambda (nick)
		  (concat nick
			  (if (member nick rcirc-ignore-list-automatic)
			      "*" "")))
		rcirc-ignore-list " ")))
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(defun rcirc-message-leader (sender face)
  "Return a string with SENDER propertized with FACE."
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  (rcirc-facify (concat "<" sender "> ") face))
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(defun rcirc-facify (string face)
  "Return a copy of STRING with FACE property added."
  (propertize (or string "") 'face face 'rear-nonsticky t))

(defvar rcirc-url-regexp
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  (rx word-boundary
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      (or "www."
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	  (and (or "http" "https" "ftp" "file" "gopher" "news" "telnet" "wais"
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