code shortcut to trigger export (with <Ctrl-E>); it outputs syntatically valid .sml, but I am not sure if the output is correct as intended so it needs testing

a.sml

@@ -1,22 +0,0 @@
-structure LowerCaseA =
-struct
-  fun lerp (startX, startY, drawWidth, drawHeight, windowWidth, windowHeight) =
-    let
-       val endX = startX + drawWidth
-       val endY = startY + drawHeight
-    in
-       [      ((startX * (1.0 - 0.47499999404)) + (endX * 0.47499999404)) / windowWidth,
-      ((startY * (1.0 - 0.700000047684)) + (endY * 0.700000047684)) / windowHeight,
-      ((startX * (1.0 - 0.299999982119)) + (endX * 0.299999982119)) / windowWidth,
-      ((startY * (1.0 - 0.675000011921)) + (endY * 0.675000011921)) / windowHeight,
-      ((startX * (1.0 - 0.449999988079)) + (endX * 0.449999988079)) / windowWidth,
-      ((startY * (1.0 - 0.550000011921)) + (endY * 0.550000011921)) / windowHeight,
-      ((startX * (1.0 - 0.625)) + (endX * 0.625)) / windowWidth,
-      ((startY * (1.0 - 0.275000035763)) + (endY * 0.275000035763)) / windowHeight,
-      ((startX * (1.0 - 0.799999952316)) + (endX * 0.799999952316)) / windowWidth,
-      ((startY * (1.0 - 0.400000035763)) + (endY * 0.400000035763)) / windowHeight,
-      ((startX * (1.0 - 0.524999976158)) + (endX * 0.524999976158)) / windowWidth,
-      ((startY * (1.0 - 0.524999976158)) + (endY * 0.524999976158)) / windowHeight
-    ]
-  end
-end

functional-core/app/app-update.sml

@@ -211,8 +211,15 @@ struct
       (model, FILE fileMsg)
     end
 
-  fun getLoadTriangleMsg model =
-    (model, FILE LOAD_TRIANGLES)
+  fun getLoadTrianglesMsg model = (model, FILE LOAD_TRIANGLES)
+
+  fun getExportTrianglesMsg model =
+    let
+      val {triangles, ...} = model
+      val fileMsg = EXPORT_TRIANGLES (#triangles model)
+    in
+      (model, FILE fileMsg)
+    end
 
   fun useTriangles (model, triangles) =
     let
@@ -238,7 +245,8 @@ struct
     | REDO_ACTION => redoAction model
     | KEY_G => toggleGraph model
     | KEY_CTRL_S => getSaveTrianglesMsg model
-    | KEY_CTRL_L => getLoadTriangleMsg model
+    | KEY_CTRL_L => getLoadTrianglesMsg model
+    | KEY_CTRL_E => getExportTrianglesMsg model
     | USE_TRIANGLES triangles => useTriangles (model, triangles)
     | TRIANGLES_LOAD_ERROR => trianglesLoadError model
 end

imperative-shell/file-thread.sml

@@ -143,7 +143,7 @@ struct
         case Mailbox.recv fileMailbox of
           SAVE_TRIANGLES triangles => saveTriangles triangles
         | LOAD_TRIANGLES => loadTriangles inputMailbox
-        | EXPORT_TRIANGLES triangles => ()
+        | EXPORT_TRIANGLES triangles => exportTriangles triangles
     in
       run (fileMailbox, inputMailbox)
     end

imperative-shell/input-callbacks.sml

@@ -51,6 +51,11 @@ struct
       key = Input.KEY_L () andalso action = Input.PRESS () andalso mods = 0x002
     then
       Mailbox.send (mailbox, KEY_CTRL_L)
+    else if
+      (* ctrl-l *)
+      key = Input.KEY_E () andalso action = Input.PRESS () andalso mods = 0x002
+    then
+      Mailbox.send (mailbox, KEY_CTRL_E)
     else
       ()
 

message-types/input-msg.sml

@@ -10,6 +10,7 @@ sig
   | KEY_G
   | KEY_CTRL_S
   | KEY_CTRL_L
+  | KEY_CTRL_E
   | USE_TRIANGLES of AppType.triangle list
   | TRIANGLES_LOAD_ERROR
 end
@@ -26,6 +27,7 @@ struct
   | KEY_G
   | KEY_CTRL_S
   | KEY_CTRL_L
+  | KEY_CTRL_E
   | USE_TRIANGLES of AppType.triangle list
   | TRIANGLES_LOAD_ERROR
 end