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;;; +circe.el -*- lexical-binding: t; -*-

;;; Code:

(require '+util)
(require 'circe)

(defgroup +circe nil
  "Extra customizations for Circe."
  :group 'circe)

(defcustom +circe-left-margin 16
  "The size of the margin on the left."
  :type 'integer)

(defcustom +circe-network-inhibit-autoconnect nil
  "Servers to inhibit autoconnecting from `circe-network-options'."
  :type '(repeat string))

;;; Connecting to IRC

;;;###autoload
(defun +irc ()
  "Connect to all IRC networks in `circe-network-options'."
  (interactive)
  (dolist (network (mapcar 'car circe-network-options))
    (unless (member network +circe-network-inhibit-autoconnect)
      (+circe-maybe-connect network))))

(defun +circe-network-connected-p (network)
  "Return t if connected to NETWORK, nil otherwise."
  (catch 'return
    (dolist (buffer (circe-server-buffers))
      (with-current-buffer buffer
        (when (string= network circe-server-network)
          (throw 'return t))))))

(defun +circe-maybe-connect (network)
  "Connect to NETWORK, asking for confirmation to reconnect."
  (interactive ("sNetwork: "))
  (when (or (not (+circe-network-connected-p network))
            (yes-or-no-p (format "Already connected to %s, reconnect? "
                                 network)))
    (circe network)))

;;; Channel information

(defun +circe-current-topic (&optional message)
  "Return the topic of the current channel.
When called with optional MESSAGE non-nil, or interactively, also
message the current topic."
  (interactive "p")
  (let ((topic
         (save-excursion
           (goto-char (point-max))
           (or (re-search-backward
                (rx (group "*** "
                           (or "Topic" "topic" "TOPIC")
                           (* (not ":")) ": ")
                    (group (+ nonl)))))
           (buffer-substring-no-properties
            (match-beginning 2) (match-end 2)))))
    (when message
      (message "%s" topic))
    topic))

;;; Formatting messages

(defun +circe-format-meta (string)
  "Return a format string for `lui-format' for metadata messages."
  (format "{nick:%1$d.%1$ds} *** %s" (- +circe-left-margin 3) string))

(defmacro +lui-make-formatting-list-rx (char)
  "Make a formatting regex for CHAR delimiters.
For entry into `lui-formatting-list'."
  `(rx (or bol whitespace)
         (group ,char (+? (not (any whitespace ,char))) ,char)
         (or eol whitespace)))

;;; Hooks & Advice

(defun +circe-chat@set-prompt ()
  "Set the prompt to the (shortened) buffer name."
  (interactive)
  (lui-set-prompt (propertize (+string-align (buffer-name) +circe-left-margin
                                             :after " > "
                                             :ellipsis "~"
                                             :alignment 'right))))

(defun +circe-kill-buffer (&rest _)
  "Kill a circe buffer without confirmation, and after a delay."
  (let ((circe-channel-killed-confirmation nil)
        (circe-server-killed-confirmation nil))
    (run-with-timer 0.25 nil 'kill-buffer)))

(defun +circe-quit@kill-buffer (&rest _)
  "ADVICE: kill all buffers of a server after `circe-command-QUIT'."
  (with-circe-server-buffer
    (dolist (buf (circe-server-buffers))
      (with-current-buffer buf
        (+circe-kill-buffer)))
    (+circe-kill-buffer)))

(defun +circe-gquit@kill-buffer (&rest _)
  "ADVICE: kill all Circe buffers after `circe-command-GQUIT'."
  (dolist (buf (circe-server-buffers))
    (with-current-buffer buf
      (+circe-quit@kill-buffer))))

(defun +circe-quit-all@kill-emacs ()
  "Quit all circe buffers when killing Emacs."
  (ignore-errors
    (advice-remove 'circe-command-GQUIT
                   'circe-gquit@kill-buffer)
    (circe-command-GQUIT "Quitting Emacs, bye!")))

;;; Patches

(require 'el-patch)

(el-patch-feature circe)
(defvar +circe-server-buffer-action 'pop-to-buffer-same-window
  "What to do with `circe-server' buffers when created.")

(el-patch-defun circe (network-or-server &rest server-options)
    "Connect to IRC.

Connect to the given network specified by NETWORK-OR-SERVER.

When this function is called, it collects options from the
SERVER-OPTIONS argument, the user variable
`circe-network-options', and the defaults found in
`circe-network-defaults', in this order.

If NETWORK-OR-SERVER is not found in any of these variables, the
argument is assumed to be the host name for the server, and all
relevant settings must be passed via SERVER-OPTIONS.

All SERVER-OPTIONS are treated as variables by getting the string
\"circe-\" prepended to their name. This variable is then set
locally in the server buffer.

See `circe-network-options' for a list of common options."
    (interactive (circe--read-network-and-options))
    (let* ((options (circe--server-get-network-options network-or-server
                                                       server-options))
           (buffer (circe--server-generate-buffer options)))
      (with-current-buffer buffer
        (circe-server-mode)
        (circe--server-set-variables options)
        (circe-reconnect))
      (el-patch-swap (pop-to-buffer-same-window buffer)
                     (funcall +circe-server-buffer-action buffer))))

;;; Chat commands

(defun circe-command-SHORTEN (url)
  "Shorten URL using `0x0-shorten-uri'.")

(defun circe-command-SLAP (nick)
  "Slap NICK around a bit with a large trout.")

;;; Pure idiocy

(define-minor-mode circe-cappy-hour-mode
  "ENABLE CAPPY HOUR IN CIRCE!"
  :lighter "CAPPY HOUR"
  (when (derived-mode-p 'circe-chat-mode)
    (if circe-cappy-hour-mode
        (setq-local lui-input-function
                    (lambda (input) (circe--input (upcase input))))
      ;; XXX: It'd be better if this were more general, but whatever.
      (setq-local lui-input-function #'circe--input))))

(provide '+circe)
;;; +circe.el ends here