Add external tracking in mowedline for circe

emacs/.emacs.d/init/oni-circe-init.org

@@ -5,6 +5,7 @@
   (require 'circe-color-nicks)
   (require 'circe-serenity)
   (require 'oni-circe)
+  (require 'mowedline)
 #+END_SRC
 
 I switched to Circe from ERC because I couldn't make the
@@ -52,3 +53,66 @@ Serenity.
 #+BEGIN_SRC emacs-lisp
   (enable-circe-serenity)
 #+END_SRC
+
+Add external tracking.  Show the status of tracked buffers in
+mowedline instead in the mode-line. With color!
+
+This code has been generously donated by [[http://retroj.net][retroj]], the author of
+mowedline.
+
+First define a function to parse the text properties from the tracking
+buffers list so that highlights (from mentions) also appear in
+mowedline.
+
+#+BEGIN_SRC emacs-lisp
+  (defun mowedline-colorize-mode-line-spec (s)
+    (cond
+     ((stringp s) (string-trim s))
+     ((eq ':propertize (car s))
+      (let ((s (cadr s))
+            (face (plist-get (cddr s) 'face)))
+        (if face
+            `(color ,(face-foreground face)
+                    ,(substring-no-properties s))
+          s)))
+     (t "")))
+#+END_SRC
+
+Also tell mowedline to use the dbus interface directly, instead of
+going through the command-line interface.
+
+#+BEGIN_SRC emacs-lisp
+  (setq mowedline-update-function 'mowedline-update/dbus)
+#+END_SRC
+
+#+BEGIN_SRC emacs-lisp
+  (defvar jjf-tracking-buffers '())
+  (defvar jjf-external-tracking-timer nil)
+  (defun jjf-external-tracking ()
+    (setq jjf-external-tracking-timer nil)
+    (mowedline-update
+     'irc
+     (if (stringp jjf-tracking-buffers)
+         (mowedline-colorize jjf-tracking-buffers t)
+       (format "%S" (mapcar #'mowedline-colorize-mode-line-spec
+                            jjf-tracking-buffers)))))
+
+  (defun oni:clear-irc-mowedline-widget ()
+    (mowedline-clear 'irc))
+
+  (defun jjf-external-tracking-advice (orig-fun &rest args)
+    "Update my external status bar when tracking computes a new
+  status line, and suppress tracking in the mode-line.  Since
+  tracking-status may be called many times in quick succession, for
+  example on a make-frame-visible event, we use a short timer to
+  only call the updater once within a minimum duration."
+    (setq jjf-tracking-buffers (apply orig-fun args))
+    (when jjf-external-tracking-timer
+      (cancel-timer jjf-external-tracking-timer))
+    (setq jjf-external-tracking-timer
+          (run-at-time 0.2 nil 'jjf-external-tracking))
+    nil)
+
+  (advice-add 'tracking-status :around #'jjf-external-tracking-advice)
+  (add-hook 'kill-emacs-hook 'oni:clear-irc-mowedline-widget)
+#+END_SRC