From 1c9d04d792677faed5ec68a8fdc42d44c827ae74 Mon Sep 17 00:00:00 2001
From: Amin Bandali <bandali@gnu.org>
Date: Wed, 21 Aug 2019 18:54:04 -0400
Subject: [PATCH] emacs: erc: fix for erc lurker (bug#36843)

https://bugs.gnu.org/36843
---
 .emacs.d/init.el | 75 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/.emacs.d/init.el b/.emacs.d/init.el
index 71b7f10..d3f8850 100644
--- a/.emacs.d/init.el
+++ b/.emacs.d/init.el
@@ -2086,7 +2086,80 @@ https://csclub.uwaterloo.ca/~abandali")
   (add-to-list 'erc-modules 'notifications)
   (add-to-list 'erc-modules 'spelling)
   (add-to-list 'erc-modules 'scrolltoplace)
-  (erc-update-modules))
+  (erc-update-modules)
+
+  (when (and (version<= "24.4" emacs-version)
+             (version<         emacs-version "27"))
+    ;; fix erc-lurker bug
+    ;; patch submitted: https://bugs.gnu.org/36843#10
+    ;; TODO: remove when patch is merged and emacs 27 is released
+    (defvar erc-message-parsed)
+    (defun erc-display-message (parsed type buffer msg &rest args)
+      "Display MSG in BUFFER.
+
+ARGS, PARSED, and TYPE are used to format MSG sensibly.
+
+See also `erc-format-message' and `erc-display-line'."
+      (let ((string (if (symbolp msg)
+                        (apply #'erc-format-message msg args)
+                      msg))
+            (erc-message-parsed parsed))
+        (setq string
+              (cond
+               ((null type)
+                string)
+               ((listp type)
+                (mapc (lambda (type)
+                        (setq string
+                              (erc-display-message-highlight type string)))
+                      type)
+                string)
+               ((symbolp type)
+                (erc-display-message-highlight type string))))
+
+        (if (not (erc-response-p parsed))
+            (erc-display-line string buffer)
+          (unless (erc-hide-current-message-p parsed)
+            (erc-put-text-property 0 (length string) 'erc-parsed parsed string)
+            (erc-put-text-property 0 (length string) 'rear-sticky t string)
+            (when (erc-response.tags parsed)
+              (erc-put-text-property 0 (length string) 'tags (erc-response.tags parsed)
+                                     string))
+            (erc-display-line string buffer)))))
+
+    (defun erc-lurker-update-status (_message)
+      "Update `erc-lurker-state' if necessary.
+
+This function is called from `erc-insert-pre-hook'.  If the
+current message is a PRIVMSG, update `erc-lurker-state' to
+reflect the fact that its sender has issued a PRIVMSG at the
+current time.  Otherwise, take no action.
+
+This function depends on the fact that `erc-display-message'
+lexically binds `erc-message-parsed', which is used to check if
+the current message is a PRIVMSG and to determine its sender.
+See also `erc-lurker-trim-nicks' and `erc-lurker-ignore-chars'.
+
+In order to limit memory consumption, this function also calls
+`erc-lurker-cleanup' once every `erc-lurker-cleanup-interval'
+updates of `erc-lurker-state'."
+      (when (and (boundp 'erc-message-parsed)
+                 (erc-response-p erc-message-parsed))
+        (let* ((command (erc-response.command erc-message-parsed))
+               (sender
+                (erc-lurker-maybe-trim
+                 (car (erc-parse-user (erc-response.sender erc-message-parsed)))))
+               (server
+                (erc-canonicalize-server-name erc-server-announced-name)))
+          (when (equal command "PRIVMSG")
+            (when (>= (cl-incf erc-lurker-cleanup-count)
+                      erc-lurker-cleanup-interval)
+              (setq erc-lurker-cleanup-count 0)
+              (erc-lurker-cleanup))
+            (unless (gethash server erc-lurker-state)
+              (puthash server (make-hash-table :test 'equal) erc-lurker-state))
+            (puthash sender (current-time)
+                     (gethash server erc-lurker-state))))))))
 
 (use-package erc-fill
   :after erc
-- 
2.20.1