;;; prelude-erc.el --- Emacs Prelude: ERC mode configuration.
;;
;; Copyright (c) 2011 Bozhidar Batsov
;;
;; Author: Bozhidar Batsov <bozhidar.batsov@gmail.com>
;; URL: http://www.emacswiki.org/cgi-bin/wiki/Prelude
;; Version: 1.0.0
;; Keywords: convenience

;; This file is not part of GNU Emacs.

;;; Commentary:

;; Some basic configuration for ERC mode, which should make your
;; IRC experience a bit more pleasant.

;;; License:

;; This program 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 3
;; of the License, or (at your option) any later version.
;;
;; This program 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
;; 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.

;;; Code:

(require 'erc)
(require 'erc-log)
(require 'erc-notify)
(require 'erc-spelling)
(require 'erc-autoaway)

;; Interpret mIRC-style color commands in IRC chats
(setq erc-interpret-mirc-color t)

;; The following are commented out by default, but users of other
;; non-Emacs IRC clients might find them useful.
;; Kill buffers for channels after /part
(setq erc-kill-buffer-on-part t)
;; Kill buffers for private queries after quitting the server
(setq erc-kill-queries-on-quit t)
;; Kill buffers for server messages after quitting the server
(setq erc-kill-server-buffer-on-quit t)

;; open query buffers in the current window
(setq erc-query-display 'buffer)

;; exclude boring stuff from tracking
(erc-track-mode t)
(setq erc-track-exclude-types '("JOIN" "NICK" "PART" "QUIT" "MODE"
                                "324" "329" "332" "333" "353" "477"))

;; logging
(setq erc-log-channels-directory "~/.erc/logs/")

(if (not (file-exists-p erc-log-channels-directory))
    (mkdir erc-log-channels-directory t))

(setq erc-save-buffer-on-part t)
(defadvice save-buffers-kill-emacs (before save-logs (arg) activate)
  (save-some-buffers t (lambda () (when (eq major-mode 'erc-mode) t))))

;; truncate long irc buffers
(erc-truncate-mode +1)

;; enable spell checking
(erc-spelling-mode 1)
;; set different dictionaries by different servers/channels
;;(setq erc-spelling-dictionaries '(("#emacs" "american")))

;; TODO - replace this with use of notify.el
;; Notify my when someone mentions my nick.
(defun call-libnotify (matched-type nick msg)
  (let* ((cmsg  (split-string (clean-message msg)))
         (nick   (first (split-string nick "!")))
         (msg    (mapconcat 'identity (rest cmsg) " ")))
    (shell-command-to-string
     (format "notify-send -u critical '%s says:' '%s'" nick msg))))

(when (eq system-type 'linux)
  (add-hook 'erc-text-matched-hook 'call-libnotify))

(defvar erc-notify-nick-alist nil
  "Alist of nicks and the last time they tried to trigger a
notification")

(defvar erc-notify-timeout 10
  "Number of seconds that must elapse between notifications from
the same person.")

(defun erc-notify-allowed-p (nick &optional delay)
  "Return non-nil if a notification should be made for NICK.
If DELAY is specified, it will be the minimum time in seconds
that can occur between two notifications.  The default is
`erc-notify-timeout'."
  (unless delay (setq delay erc-notify-timeout))
  (let ((cur-time (time-to-seconds (current-time)))
        (cur-assoc (assoc nick erc-notify-nick-alist))
        (last-time nil))
    (if cur-assoc
        (progn
          (setq last-time (cdr cur-assoc))
          (setcdr cur-assoc cur-time)
          (> (abs (- cur-time last-time)) delay))
      (push (cons nick cur-time) erc-notify-nick-alist)
      t)))

;; private message notification
(defun erc-notify-on-private-msg (proc parsed)
  (let ((nick (car (erc-parse-user (erc-response.sender parsed))))
        (target (car (erc-response.command-args parsed)))
        (msg (erc-response.contents parsed)))
    (when (and (erc-current-nick-p target)
               (not (erc-is-message-ctcp-and-not-action-p msg))
               (erc-notify-allowed-p nick))
      (shell-command-to-string
       (format "notify-send -u critical '%s says:' '%s'" nick msg))
      nil)))

(add-hook 'erc-server-PRIVMSG-functions 'erc-notify-on-private-msg)

;; autoaway setup
(setq erc-auto-discard-away t)
(setq erc-autoaway-idle-seconds 600)
(setq erc-autoaway-use-emacs-idle t)

;; utf-8 always and forever
(setq erc-server-coding-system '(utf-8 . utf-8))

(defun start-irc ()
  "Connect to IRC."
  (interactive)
  (when (y-or-n-p "Do you want to start IRC? ")
    (erc :server "irc.freenode.net" :port 6667 :nick erc-nick)))

(defun filter-server-buffers ()
  (delq nil
        (mapcar
         (lambda (x) (and (erc-server-buffer-p x) x))
         (buffer-list))))

(defun stop-irc ()
  "Disconnects from all irc servers"
  (interactive)
  (dolist (buffer (filter-server-buffers))
    (message "Server buffer: %s" (buffer-name buffer))
    (with-current-buffer buffer
      (erc-quit-server "Asta la vista"))))

(provide 'prelude-erc)

;;; prelude-erc.el ends here