Add `circe-current-topic' and make topsy.el use it

init.el

@@ -1178,8 +1178,13 @@ specific to most general, they are these:
            ;; circe-my-message-face
            ;; ((t (:inherit (modus-themes-slant))))
            ))
+
+  (with-eval-after-load 'topsy
+    (:option (append topsy-mode-functions)
+             '(circe-channel-mode . circe-current-topic)))
   
   (:bind "C-c C-p" #'circe-command-PART
+         "C-c C-t" #'circe-current-topic ; in acdw-circe.el
          "C-l" #'lui-track-jump-to-indicator
          "<C-return>" #'circe-chat@set-prompt)
 
@@ -1197,7 +1202,7 @@ specific to most general, they are these:
   (:bind "C-c C-s" #'circe-command-SLAP)
 
   (autoload 'circe-nick-color-reset "circe-color-nicks")
-  (add-hook 'modus-themes-after-load-theme-hook
+  (add-hook 'modus-themes-after-theme-hook
             #'circe-nick-color-reset)
 
   (:with-mode lui-mode

lisp/acdw-circe.el

@@ -8,6 +8,22 @@
 
 (require 'circe)
 
+;;; Functions
+
+(defun circe-current-topic (&optional message)
+  "Return the topic of the current channel.
+When called with MESSAGE set to non-nil (or interactively), also
+message the current topic."
+  (interactive "p")
+  (let ((topic
+         (save-excursion
+           (re-search-backward (rx "*** Topic for #" (+ (or word "-")) ": "))
+           (buffer-substring-no-properties
+            (match-end 0) (line-end-position)))))
+    (when message
+      (message "%s" topic))
+    topic))
+
 ;;; Chat commands
 
 (defun circe-command-SHORTEN (url)