in generated export string, use structure name which is based on the name of the input file

imperative-shell/converter.sml

@@ -5,7 +5,7 @@ struct
       SOME line => loadIO (io, str ^ line)
     | NONE => str
 
-  fun convertFile (fullPath, filename) =
+  fun convertFile fullPath =
     let
       val io = TextIO.openIn fullPath
       val text = loadIO (io, "")
@@ -17,7 +17,7 @@ struct
             val maxSide = Int.max (canvasWidth, canvasHeight)
             val squares = LayerTree.flatten (maxSide, tree)
             val exportString =
-              CollisionTree.toExportString (squares, canvasWidth, canvasHeight)
+              CollisionTree.toExportString (squares, canvasWidth, canvasHeight, fullPath)
 
             val pathWithoutExtension = String.substring
               (fullPath, 0, String.size fullPath - 4)
@@ -57,7 +57,7 @@ struct
               ()
             else if endsWithDsc path then
               (* is a file ending with .dsc extension *)
-              convertFile (folderPath, path)
+              convertFile folderPath
             else
               (* is a file but doesn't end with .dsc, so ignore *)
               ()