diff --git a/resources/public/codemirror.cljs b/resources/public/codemirror.cljs
new file mode 100644
index 0000000..57a0a0e
--- /dev/null
+++ b/resources/public/codemirror.cljs
@@ -0,0 +1,54 @@
+(require '[clojure.string :as str])
+(declare cm)
+
+(defn eval-me []
+  (js/scittle.core.eval_string (-> cm .-state .-doc .toString)))
+
+(def extension
+  (.of js/cv.keymap
+       (clj->js [{:key "Mod-Enter"
+                  :run (fn []
+                         (prn :hoeooo)
+                         (eval-me))}
+                 #_{:key (str modifier "-Enter")
+                    :shift (partial eval-top-level on-result)
+                    :run (partial eval-at-cursor on-result)}])))
+(def cm
+  (let [doc (str/trim "
+(require '[reagent.core :as r]
+         '[reagent.dom :as rdom])
+
+(defonce state (r/atom {:clicks 0}))
+
+(defn my-component []
+  [:div
+    [:p \"Clicks: \" (:clicks @state)]
+    [:p [:button {:on-click #(swap! state update :clicks inc)}
+          \"Click me!\"]]])
+
+(rdom/render [my-component] (.getElementById js/document \"reagent\"))
+")]
+    (js/cm.EditorView. #js {:doc doc
+                            :extensions #js [js/cm.basicSetup, (js/lc.clojure), (.highest js/cs.Prec extension)]
+                            :parent (js/document.querySelector "#app")
+                            #_#_:dispatch (fn [tr] (-> cm (.update #js [tr])) (eval-me))
+                            })))
+(set! (.-eval_me js/globalThis) eval-me)
+(set! (.-cm_instance js/globalThis) cm)
+
+(defn linux? []
+  (some? (re-find #"(Linux)|(X11)" js/navigator.userAgent)))
+
+(defn mac? []
+  (and (not (linux?))
+       (some? (re-find #"(Mac)|(iPhone)|(iPad)|(iPod)" js/navigator.platform))))
+
+(let [elt (js/document.getElementById "evalMe")
+      txt (.-innerText elt)
+      mod-symbol (if (mac?)
+                   "⌘"
+                   "⌃")
+      txt (str txt " " mod-symbol"-⏎")]
+  (set! (.-innerHTML elt) txt))
+
+(eval-me)