draw cursor when in NORMAL_SEARCH_MODE

fcore/normal-mode/normal-search-finish.sml

@@ -28,6 +28,27 @@ struct
         , floatWindowHeight
         )
 
+      val cursor =
+        let
+          val xpos = TextConstants.xSpace * (searchCursorIdx + 1) + 5
+          val x = Real32.fromInt xpos
+          val y = Real32.fromInt searchStringPosY
+          val r: Real32.real = 0.67
+          val g: Real32.real = 0.51
+          val b: Real32.real = 0.83
+        in
+          PipeCursor.lerp
+            ( x
+            , y
+            , TextConstants.scale
+            , floatWindowWidth
+            , floatWindowHeight
+            , r
+            , g
+            , b
+            )
+        end
+
       val buffer = LineGap.goToLine (startLine, buffer)
       val startLine = TextWindow.getStartLine
         (buffer, startLine, cursorIdx, windowWidth, windowHeight)
@@ -45,7 +66,7 @@ struct
         , tempSearchList
         , searchString
         , []
-        , initialTextAcc
+        , cursor :: initialTextAcc
         , []
         )
     in

fcore/pipe-cursor.sml

@@ -0,0 +1,35 @@
+structure PipeCursor = 
+struct
+  fun xToNdc (xOffset, xpos, scale, halfWidth) =
+    ((xpos * scale + xOffset) - halfWidth) / halfWidth
+
+  fun yToNdc (yOffset, ypos, scale, halfHeight) =
+   ~(((ypos * scale + yOffset) - halfHeight) / halfHeight)
+
+  fun lerp (xOffset: Real32.real, yOffset, scale, windowWidth, windowHeight, r, g, b) =
+    let
+      val halfWidth = windowWidth / 2.0
+      val halfHeight = windowHeight / 2.0
+    in
+     #[
+xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
+r, g, b,
+xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
+r, g, b,
+xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
+r, g, b,
+xToNdc (xOffset, 0.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
+r, g, b,
+xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 13.000000000000000, scale, halfHeight),
+r, g, b,
+xToNdc (xOffset, 1.000000000000000, scale, halfWidth),
+yToNdc (yOffset, 0.000000000000000, scale, halfHeight),
+r, g, b
+      ]
+    end
+end