adding the .kojo extension for Scala (#3960)

samples/Scala/turtle-controller.kojo

@@ -0,0 +1,84 @@
+// Kojo examples (files ending in .kojo) are licensed under The MIT License:
+
+// Copyright (C) 2009-2018 Lalit Pant <pant.lalit@gmail.com> and the Kojo Dev Team.
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+// Run this program to get basic control over the turtle via some buttons
+// Useful for smaller kids
+
+// Change these value to tweak the behavior of the buttons
+val fdStep = 50
+val fdStep2 = 10
+val rtStep = 90
+val rtStep2 = 10
+val bgColor = white
+val sBgColor = "white"
+// End tweak region
+
+clear()
+clearOutput()
+beamsOn()
+val width = canvasBounds.width
+val height = canvasBounds.height
+
+setBackground(bgColor)
+setPenColor(purple)
+
+def action(code: String) {
+    interpret(code); println(code)
+}
+
+val cmd = Map(
+    "forward1" -> s"forward($fdStep)",
+    "forward2" -> s"forward($fdStep2)",
+    "hop1" -> s"hop($fdStep)",
+    "hop2" -> s"hop($fdStep2)",
+    "right1" -> s"right($rtStep)",
+    "right2" -> s"right($rtStep2)",
+    "left1" -> s"left($rtStep)",
+    "left2" -> s"left($rtStep2)"
+)
+
+def eraseCmds(n: Int) =
+    s"saveStyle(); setPenColor($sBgColor); setPenThickness(4); back($n); restoreStyle()"
+
+def button(forcmd: String) = PicShape.button(cmd(forcmd)) { action(cmd(forcmd)) }
+
+val panel = trans(-width / 2, -height / 2) * scale(1.4) -> VPics(
+    HPics(
+        button("left2"),
+        button("forward2"),
+        button("right2"),
+        button("hop2"),
+        PicShape.button(s"erase($fdStep2)") { action(eraseCmds(fdStep2)) }
+    ),
+    HPics(
+        button("left1"),
+        button("forward1"),
+        button("right1"),
+        button("hop1"),
+        PicShape.button(s"erase($fdStep)") { action(eraseCmds(fdStep)) }
+    )
+)
+
+draw(panel)
+println("// Paste the generated program below into the script editor")
+println("// and run it -- to reproduce your drawing")
+println("clear()")