a bit of formatting (no other changes in this commit)

functional-core/app-update.sml

@@ -94,8 +94,8 @@ struct
       | MOUSE_LEFT_RELEASE =>
           let
             val _ = print "mouse released\n"
-            val drawMsg = DRAW_BUTTON
+            val drawMsg = 
-          (getClickPos (mouseX, mouseY, 1.0, 0.0, 0.0))
+              DRAW_BUTTON (getClickPos (mouseX, mouseY, 1.0, 0.0, 0.0))
           in
             (model, drawMsg, mouseX, mouseY)
           end

imperative-shell/app-draw.sml

@@ -106,5 +106,4 @@ struct
     in
       ()
     end
-
 end

imperative-shell/event-loop.sml

@@ -7,7 +7,8 @@ struct
     fun loop (inputMailbox, drawMailbox, mouseX, mouseY, model) =
       let
         val inputMsg = Mailbox.recv inputMailbox
-      val (model, drawMsg, mouseX, mouseY) = AppUpdate.update (model, mouseX, mouseY, inputMsg)
+        val (model, drawMsg, mouseX, mouseY) =
+          AppUpdate.update (model, mouseX, mouseY, inputMsg)
         val _ = Mailbox.send (drawMailbox, drawMsg)
       in
         loop (inputMailbox, drawMailbox, mouseX, mouseY, model)
@@ -17,7 +18,8 @@ struct
       loop (inputMailbox, drawMailbox, 0, 0, AppType.initial)
   end
 
-  fun draw (drawMailbox, window, graphDrawObject, buttonDrawObject, buttonDrawLength) =
+  fun draw
+    (drawMailbox, window, graphDrawObject, buttonDrawObject, buttonDrawLength) =
     if not (Glfw.windowShouldClose window) then
       let
         val _ = Gles3.clearColor (1.0, 1.0, 1.0, 1.0)
@@ -29,7 +31,13 @@ struct
         val _ = Glfw.pollEvents ()
         val _ = Glfw.swapBuffers window
       in
-        draw (drawMailbox, window, graphDrawObject, buttonDrawObject, buttonDrawLength)
+        draw
+          ( drawMailbox
+          , window
+          , graphDrawObject
+          , buttonDrawObject
+          , buttonDrawLength
+          )
       end
     else
       Glfw.terminate ()

imperative-shell/input-callbacks.sml

@@ -21,8 +21,7 @@ struct
       val _ = Input.exportMouseMoveCallback mouseMoveCallback
       val _ = Input.setMouseMoveCallback window
 
-          val mouseClickCallback =
+      val mouseClickCallback = mouseClickCallback inputMailbox
-            mouseClickCallback inputMailbox
       val _ = Input.exportMouseClickCallback mouseClickCallback
       val _ = Input.setMouseClickCallback window
     in

imperative-shell/shell.sml

@@ -19,9 +19,12 @@ struct
       val inputMailbox = Mailbox.mailbox ()
       val drawMailbox = Mailbox.mailbox ()
 
-      val _ = CML.spawn (fn () => InputCallbacks.registerCallbacks (window, inputMailbox))
+      val _ = CML.spawn (fn () =>
+        InputCallbacks.registerCallbacks (window, inputMailbox))
       val _ = CML.spawn (fn () => EventLoop.update (inputMailbox, drawMailbox))
-      val _ = CML.spawn (fn () => EventLoop.draw (drawMailbox, window, graphDrawObject, buttonDrawObject, 0))
+      val _ = CML.spawn (fn () =>
+        EventLoop.draw
+          (drawMailbox, window, graphDrawObject, buttonDrawObject, 0))
     in
       ()
     end

message-types/draw-msg.sml

@@ -1,11 +1,9 @@
 signature DRAW_MESSAGE =
 sig
-  datatype t =
+  datatype t = DRAW_BUTTON of Real32.real vector
-    DRAW_BUTTON of Real32.real vector
 end
 
 structure DrawMessage :> DRAW_MESSAGE =
 struct 
-  datatype t =
+  datatype t = DRAW_BUTTON of Real32.real vector 
-    DRAW_BUTTON of Real32.real vector
 end