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diff --git a/src/wasp-gizmo.el b/src/wasp-gizmo.el
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+;;; wasp-gizmo --- Gizmo helper functions -*- lexical-binding: t; -*-
+;;; Commentary:
+;;; Code:
+
+(require 'wasp-utils)
+(require 'wasp-friend)
+(require 'wasp-heartrate)
+(require 'wasp-chatsummary)
+(require 'wasp-alert-message)
+(require 'wasp-fakechat)
+(require 'wasp-bannerads)
+
+(defconst w/gizmo-buffer-names
+  (list
+    w/friend-buffer
+    w/heartrate-buffer
+    w/chatsummary-buffer
+    w/alert-message-buffer
+    w/fake-chatter-enclosure-buffer
+    w/banner-ad-buffer
+    w/chat-event-buffer
+    ))
+
+(defvar w/gizmo-windows (list))
+(defvar w/gizmo-update-hook nil)
+
+(defun w/gizmo-tag-window ()
+  "Tag the current window as containing a gizmo."
+  (interactive)
+  (when-let* ((w (selected-window)))
+    (add-to-list 'w/gizmo-windows w)))
+
+(defun w/gizmo-cycle-window (w)
+  "Cycle the gizmo in W."
+  (when-let*
+    ((cur (buffer-name (window-buffer w)))
+      (idx (--find-index (equal it cur) w/gizmo-buffer-names))
+      (bufs (-non-nil (-map #'get-buffer w/gizmo-buffer-names)))
+      (nidx (mod (+ idx 1) (length bufs)))
+      (buf (nth nidx bufs)))
+    (set-window-buffer w buf)))
+
+(defun w/gizmo-cycle ()
+  "Cycle all gizmo-bearing windows."
+  (interactive)
+  (--each w/gizmo-windows
+    (w/gizmo-cycle-window it)))
+
+(defun w/gizmo-ensure-shown (buf)
+  "Ensure that BUF is shown in one of the windows."
+  (unless (--any (s-equals? (buffer-name (window-buffer it)) (buffer-name (get-buffer buf))) w/gizmo-windows)
+    (when (window-live-p (car w/gizmo-windows))
+      (set-window-buffer (car w/gizmo-windows) buf))))
+
+(defvar w/gizmo-cycle-timer nil)
+(defun w/gizmo-run-cycle-timer ()
+  "Run the gizmo cycle timer."
+  (when w/gizmo-cycle-timer
+    (cancel-timer w/gizmo-cycle-timer))
+  (w/gizmo-cycle)
+  (setq
+    w/gizmo-cycle-timer
+    (run-with-timer 300 nil #'w/gizmo-run-cycle-timer)))
+
+(defvar w/gizmo-update-timer nil)
+(defun w/gizmo-run-update-timer ()
+  "Run the gizmo update timer."
+  (when w/gizmo-update-timer
+    (cancel-timer w/gizmo-update-timer))
+  (run-hooks 'w/gizmo-update-hook)
+  (setq
+    w/gizmo-update-timer
+    (run-with-timer 10 nil #'w/gizmo-run-update-timer)))
+
+(require 'htmlize)
+(defvar w/gizmo-html-cache (ht-create))
+(defun w/gizmo-render-html (buf)
+  "Render BUF to HTML with embedded images."
+  (let* ( (htmlize-output-type 'inline-css)
+          (htmlize-force-inline-images t)
+          (buf (htmlize-buffer buf))
+          (html (with-current-buffer buf (buffer-string))))
+    (kill-buffer buf)
+    html))
+(defun w/gizmo-upload (buf)
+  "Upload the HTML contents of BUF to the database."
+  (let* ( (b (get-buffer buf))
+          (nm (buffer-name b))
+          (render (w/gizmo-render-html b))
+          (cached (ht-get w/gizmo-html-cache nm)))
+    (unless (and cached (s-equals? cached render))
+      (ht-set w/gizmo-html-cache nm render)
+      (w/db-hset-then "gizmos" nm
+        render
+        (lambda (_)
+          (w/pub '(gizmo buffer update) (list nm)))))))
+
+(provide 'wasp-gizmo)
+;;; wasp-gizmo.el ends here