diff --git a/dsc b/dsc
index 05eb6bf..d536d5d 100755
Binary files a/dsc and b/dsc differ
diff --git a/fcore/app-init.sml b/fcore/app-init.sml
index 7a6e8a1..a72e12d 100644
--- a/fcore/app-init.sml
+++ b/fcore/app-init.sml
@@ -1,6 +1,7 @@
 signature APP_INIT =
 sig
-  val fromWindowWidthAndHeight: int * int * int * int -> AppType.app_type
+  val fromWindowWidthAndHeight: int * int * int * int * string
+                                -> AppType.app_type
 end
 
 structure AppInit :> APP_INIT =
@@ -16,6 +17,7 @@ struct
     , hFinish
     , canvasWidth
     , canvasHeight
+    , filepath
     ) : app_type =
     let
       val (xClickPoints, yClickPoints) =
@@ -38,7 +40,7 @@ struct
       , showGraph = true
       , arrowX = 0
       , arrowY = 0
-      , openFilePath = ""
+      , openFilePath = filepath
       , r = 0
       , g = 0
       , b = 0
@@ -50,7 +52,7 @@ struct
     end
 
   fun fromWindowWidthAndHeight
-    (windowWidth, windowHeight, canvasWidth, canvasHeight) =
+    (windowWidth, windowHeight, canvasWidth, canvasHeight, filepath) =
     if windowWidth > windowHeight then
       let
         val difference = windowWidth - windowHeight
@@ -66,6 +68,7 @@ struct
           , windowHeight
           , canvasWidth
           , canvasHeight
+          , filepath
           )
       end
     else
@@ -83,6 +86,7 @@ struct
           , hFinish
           , canvasWidth
           , canvasHeight
+          , filepath
           )
       end
 end
diff --git a/fcore/quad-tree.sml b/fcore/quad-tree.sml
index 2a949f4..30717ce 100644
--- a/fcore/quad-tree.sml
+++ b/fcore/quad-tree.sml
@@ -1,13 +1,22 @@
 structure CollisionTree =
 struct
-  local
-    fun findLastDot (str, pos) =
-      if pos < 0 then ~1
-      else if String.sub (str, pos) = #"." then pos
-      else findLastDot (str, pos - 1)
+  fun findLastChr (str, pos, findChr) =
+    if pos < 0 then ~1
+    else if String.sub (str, pos) = findChr then pos
+    else findLastChr (str, pos - 1, findChr)
 
+  fun extractFileName str =
+    let
+      val lastSlash = findLastChr (str, String.size str - 1, #"/")
+      val strStart = lastSlash + 1
+    in
+      if lastSlash = ~1 then str
+      else String.substring (str, strStart, String.size str - strStart)
+    end
+
+  local
     fun removeFileExtension str =
-      let val lastDot = findLastDot (str, String.size str - 1)
+      let val lastDot = findLastChr (str, String.size str - 1, #".")
       in if lastDot = ~1 then str else String.substring (str, 0, lastDot)
       end
 
@@ -16,18 +25,25 @@ struct
       in String.implode acc
       end
 
+    (* convert from kebab-case or snake_case to PascalCase *)
     fun loop (#"-" :: chr :: tl, acc) =
           let val acc = Char.toUpper chr :: acc
           in loop (tl, acc)
           end
+      | loop (#"_" :: chr :: tl, acc) =
+          let val acc = Char.toUpper chr :: acc
+          in loop (tl, acc)
+          end
       | loop ([#"-"], acc) = finish acc
+      | loop ([#"_"], acc) = finish acc
       | loop (chr :: tl, acc) =
           loop (tl, chr :: acc)
       | loop ([], acc) = finish acc
   in
-    fun kebabCaseToPascalCase str =
+    fun filenameToStructureName str =
       let
         val str = removeFileExtension str
+        val str = extractFileName str
       in
         (* capitalise first character in string *)
         case String.explode str of
diff --git a/imperative-shell/init-glfw.sml b/imperative-shell/init-glfw.sml
index 7c7fbe9..29a9332 100644
--- a/imperative-shell/init-glfw.sml
+++ b/imperative-shell/init-glfw.sml
@@ -2,7 +2,7 @@ structure InitGlfw =
 struct
   open CML
 
-  fun init () =
+  fun init path () =
     let
       (* Set up GLFW. *)
       val _ = Glfw.init ()
@@ -20,6 +20,7 @@ struct
         , Constants.windowHeight
         , Constants.initialWidthClickPoints
         , Constants.initialHeightClickPoints
+        , path
         )
 
       val graphLines = GraphLines.generate initialModel
@@ -59,6 +60,6 @@ struct
       ()
     end
 
-  fun main () =
-    (RunCML.doit (init, NONE); ())
+  fun main path =
+    (RunCML.doit (init path, NONE); ())
 end
diff --git a/imperative-shell/shell.sml b/imperative-shell/shell.sml
index fea114e..f39b4fe 100644
--- a/imperative-shell/shell.sml
+++ b/imperative-shell/shell.sml
@@ -3,7 +3,8 @@ struct
   fun main () =
     case CommandLine.arguments () of
       ["-r"] => Converter.main ()
-    | [] => InitGlfw.main ()
+    | [filename] => InitGlfw.main filename
+    | [] => print "error: no arguments\n"
     | args =>
         let
           val args = String.concatWith "" args