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erc-capab.el
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erc-capab.el
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;;; erc-capab.el --- support for dancer-ircd and hyperion's CAPAB -*- lexical-binding: t; -*-
;; Copyright (C) 2006-2024 Free Software Foundation, Inc.
;; Maintainer: Amin Bandali <bandali@gnu.org>, F. Jason Park <jp@neverwas.me>
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This file defines the ERC module `erc-capab-identify', which allows
;; flagging of unidentified users on servers running dancer-ircd or
;; hyperion. freenode.net supports this capability, for example.
;; With CAPAB IDENTIFY-MSG and IDENTIFY-CTCP enabled, messages from
;; users who have identified themselves to NickServ will have a plus
;; sign and messages from unidentified users will have a minus sign
;; added as a prefix. Note that it is not necessary for your nickname
;; to be identified in order to receive these marked messages.
;; The plus or minus sign is removed from the message, and a prefix,
;; `erc-capab-identify-prefix', is inserted in the front of the user's
;; nickname if the nickname is not identified.
;; Please note that once this has been enabled on a server, there is no
;; way to tell the server to stop sending marked messages. If you
;; disable this module, it will continue removing message flags, but the
;; unidentified nickname prefix will not be added to messages.
;; Visit <https://freenode.net/kb/answer/cloaks> and
;; <https://freenode.net/kb/answer/registration> to find further
;; explanations of this capability.
;; From freenode.net's web site (not there anymore) on how to mark
;; unidentified users:
;; "We recommend that you add an asterisk before the nick, and
;; optionally either highlight or colorize the line in some
;; appropriate fashion, if the user is not identified."
;;; Usage:
;; Put the following in your init file.
;; (require 'erc-capab)
;; (erc-capab-identify-mode 1)
;; `erc-capab-identify-prefix' will now be added to the beginning of
;; unidentified users' nicknames. The default is an asterisk, "*".
;; You can customize the prefix and the face used to display it,
;; `erc-capab-identify-unidentified'. If the value of
;; `erc-capab-identify-prefix' is nil or you disable this module (see
;; `erc-capab-identify-activated'), no prefix will be inserted, but the
;; flag sent by the server will still be stripped.
;;; Code:
(require 'erc)
;;; Customization:
(defgroup erc-capab nil
"Support for dancer-ircd's CAPAB settings."
:group 'erc)
(defcustom erc-capab-identify-prefix "*"
"The prefix used for unidentified users.
If you change this from the default \"*\", be sure to use a
character not found in IRC nicknames to avoid confusion."
:type '(choice string (const nil)))
(defface erc-capab-identify-unidentified '((t)) ; same as `erc-default-face'
"Face to use for `erc-capab-identify-prefix'."
:group 'erc-faces)
;;; Define module:
;;;###autoload(autoload 'erc-capab-identify-mode "erc-capab" nil t)
(put 'capab-identify 'erc-group 'erc-capab)
(define-erc-module capab-identify nil
"Handle dancer-ircd's CAPAB IDENTIFY-MSG and IDENTIFY-CTCP."
;; append so that `erc-server-parameters' is already set by `erc-server-005'
((add-hook 'erc-server-005-functions #'erc-capab-identify-setup t)
(add-hook 'erc-server-290-functions #'erc-capab-identify-activate)
(add-hook 'erc-server-PRIVMSG-functions
#'erc-capab-identify-remove/set-identified-flag)
(add-hook 'erc-server-NOTICE-functions
#'erc-capab-identify-remove/set-identified-flag)
(add-hook 'erc-insert-modify-hook #'erc-capab-identify-add-prefix t)
(mapc (lambda (buffer)
(when buffer
(with-current-buffer buffer (erc-capab-identify-setup))))
(erc-buffer-list #'erc-open-server-buffer-p)))
((remove-hook 'erc-server-005-functions #'erc-capab-identify-setup)
(remove-hook 'erc-server-290-functions #'erc-capab-identify-activate)
;; we don't remove the `erc-capab-identify-remove/set-identified-flag' hooks
;; because there doesn't seem to be a way to tell the server to turn it off
(remove-hook 'erc-insert-modify-hook #'erc-capab-identify-add-prefix)))
;;; Variables:
(defvar-local erc-capab-identify-activated nil
"CAPAB IDENTIFY-MSG has been activated.")
(defvar-local erc-capab-identify-sent nil
"CAPAB IDENTIFY-MSG and IDENTIFY-CTCP messages have been sent.")
;;; Functions:
(defun erc-capab-identify-setup (&optional _proc _parsed)
"Set up CAPAB IDENTIFY on the current server.
Optional argument PROC is the current server's process.
Optional argument PARSED is the current message, a response struct.
These arguments are sent to this function when called as a hook in
`erc-server-005-functions'."
(unless erc-capab-identify-sent
(erc-capab-identify-send-messages)))
(defun erc-capab-identify-send-messages ()
"Send CAPAB IDENTIFY messages if the server supports it."
(when (and (stringp erc-server-version)
(string-match "^\\(dancer-ircd\\|hyperion\\)" erc-server-version)
;; could possibly check for '("IRCD" . "dancer") in
;; `erc-server-parameters' instead of looking for a specific name
;; in `erc-server-version'
(erc--get-isupport-entry 'CAPAB))
(erc-log "Sending CAPAB IDENTIFY-MSG and IDENTIFY-CTCP")
(erc-server-send "CAPAB IDENTIFY-MSG")
(erc-server-send "CAPAB IDENTIFY-CTCP")
(setq erc-capab-identify-sent t)))
(defun erc-capab-identify-activate (_proc parsed)
"Set `erc-capab-identify-activated' and display an activation message.
PROC is the current server's process.
PARSED is an `erc-parsed' response struct."
(when (member (erc-response.contents parsed)
'("IDENTIFY-MSG" "IDENTIFY-CTCP"))
(setq erc-capab-identify-activated t)
(erc-display-message
parsed 'notice 'active (format "%s activated"
(erc-response.contents parsed)))))
(defun erc-capab-identify-remove/set-identified-flag (_proc parsed)
"Remove PARSED message's id flag and add the `erc-identified' text property.
PROC is the current server's process.
PARSED is an `erc-parsed' response struct."
(let ((msg (erc-response.contents parsed)))
(when (and erc-capab-identify-activated
(string-match "^\\([-\\+]\\)\\(.+\\)$" msg))
(setf (erc-response.contents parsed)
(if erc-capab-identify-mode
(propertize (match-string 2 msg)
'erc-identified
(if (string= (match-string 1 msg) "+")
1
0))
(match-string 2 msg)))
nil)))
(defun erc-capab-identify-add-prefix ()
"Add `erc-capab-identify-prefix' to nickname if user is unidentified."
(when (and erc-capab-identify-prefix
(erc-with-server-buffer erc-capab-identify-activated))
(goto-char (or (erc-find-parsed-property) (point-min)))
(let ((nickname (erc-capab-identify-get-unidentified-nickname
(erc-get-parsed-vector (point)))))
(when (and nickname
(goto-char (point-min))
;; assuming the first use of `nickname' is the sender's nick
(re-search-forward (regexp-quote nickname) nil t))
(goto-char (match-beginning 0))
(insert (propertize erc-capab-identify-prefix
'font-lock-face
'erc-capab-identify-unidentified))))))
(defun erc-capab-identify-get-unidentified-nickname (parsed)
"Return the nickname of the user if unidentified.
PARSED is an `erc-parsed' response struct."
(when (and (erc-response-p parsed)
(equal 0 (get-text-property 0 'erc-identified
(erc-response.contents parsed))))
(let ((nickuserhost (erc-get-parsed-vector-nick parsed)))
(when nickuserhost
(nth 0 (erc-parse-user nickuserhost))))))
(provide 'erc-capab)
;;; erc-capab.el ends here
;; Local Variables:
;; generated-autoload-file: "erc-loaddefs.el"
;; End: