2 files changed, 87 insertions, 1 deletions

@@ -0,0 +1,85 @@
+;;; acdw-erc.el -*- lexical-binding: t; coding: utf-8-unix -*-
+
+;; Author: Case Duckworth <acdw@acdw.net>
+;; Created: 24 May 2021
+;; Keywords: configuration
+;; URL: https://tildegit.org/acdw/emacs
+
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+;; Everyone is permitted to do whatever with this software, without
+;; limitation.  This software comes without any warranty whatsoever,
+;; but with two pieces of advice:
+;; - Don't hurt yourself.
+;; - Make good choices.
+
+;;; Commentary:
+;; `acdw-erc' is a dumping ground for functions and stuff for ERC, so they
+;; don't clutter up `init.el'.
+
+;;; Code:
+
+(defgroup acdw-erc nil
+  "Customizations for ERC."
+  :group 'erc)
+
+
+;;; Show a different header-line face when ERC is disconnected.
+;; https://www.emacswiki.org/emacs/ErcModeline#h5o-1
+
+(defface erc/header-line-disconnected
+  '((t (:foreground "black" :background "indianred")))
+  "Face to use when ERC has been disconnected.")
+
+(defun erc/update-header-line-show-disconnected ()
+  "Use a different face in the header-line when disconnected."
+  (erc-with-server-buffer
+    (cond ((erc-server-process-alive) 'erc-header-line)
+          (t 'erc/header-line-disconnected))))
+
+
+;;; Convenience functions
+;; from Prelude:
+;; https://github.com/bbatsov/prelude/blob/master/modules/prelude-erc.el#L114
+
+(defcustom erc/servers nil
+  "The list of IRC servers to connect to with `erc/connect'."
+  :type '(list string))
+
+(defcustom erc/bye-message "See You Space Cowpokes."
+  "Quit message sent when calling `erc/disconnect'."
+  :type 'string)
+
+(defun connect-to-erc (server &optional use-tls port nick)
+  "Connects to IRC SERVER at PORT with NICK.
+If USE-TLS is non-nil, use TLS."
+  (let* ((use-tls (or use-tls t))
+         (erc-fn (if use-tls #'erc-tls #'erc))
+         (port (or port (if use-tls 6697 6667)))
+         (nick (or nick erc-nick)))
+    (funcall erc-fn
+             :server server
+             :port port
+             :nick nick)))
+
+(defun erc/connect ()
+  "Connect to all the servers in `erc/servers'."
+  (interactive)
+  (mapcar #'connect-to-erc erc/servers))
+
+(defun filter-server-buffers ()
+  (delq nil (mapcar (lambda (x)
+                      (and (erc-server-buffer-p x) x))
+                    (buffer-list))))
+
+(defun erc/disconnect ()
+  "Disconnect from all IRC servers."
+  (interactive)
+  (dolist (buffer (filter-server-buffers))
+    (with-message (format "Killing server buffer: %s" (buffer-name buffer))
+      (with-current-buffer buffer
+        (erc-quit-server acdw-erc/bye-message)))))
+
+(provide 'acdw-erc)
+;;; acdw-erc.el ends here
@@ -32,7 +32,8 @@
 
 (defun acdw-modeline/erc ()
   "ERC indicator for the modeline."
-  (format-mode-line erc-modified-channels-object))
+  (when (boundp 'erc-modified-channels-object)
+    (format-mode-line erc-modified-channels-object)))
 
 (defun acdw-modeline/god-mode-indicator ()
   (when (bound-and-true-p god-local-mode)