default sketch & fixed error where line was null

Author: Stefterv

p5js/js/sketch.js

@@ -0,0 +1,7 @@
+function setup() {
+  createCanvas(400, 400);
+}
+
+function draw() {
+  background(220);
+}

p5js/src/main/kotlin/p5js.kt

@@ -27,4 +27,14 @@ class p5js(base: Base, folder: File): Mode(base, folder) {
     override fun getIgnorable(): Array<String> {
         return arrayOf("node_modules")
     }
+
+    override fun addTemplateFiles(sketchFolder: File?, sketchName: String?): File? {
+        val sketch = super.addTemplateFiles(sketchFolder, sketchName)
+        val defaultSketch = getContentFile("js/sketch.js")
+        if (defaultSketch != null && sketch != null) {
+            defaultSketch.copyTo(sketch, overwrite = true)
+        }
+        return sketch
+
+    }
 }

p5js/src/main/kotlin/p5jsEditor.kt

@@ -303,12 +303,12 @@ class p5jsEditor(base: Base, path: String?, state: EditorState?, mode: Mode?): E
 
             // Handle output stream
             val reader = BufferedReader(InputStreamReader(process.inputStream))
-            var line: String
+            var line: String?
 
             while (reader.readLine().also { line = it } != null) {
                 // TODO: so much refactoring!
                 // Only check for errors when running the sketch
-                if (action == "pnpm sketch:start" && line.startsWith("error")) {
+                if (action == "pnpm sketch:start" && line?.startsWith("error") == true) {
                     // TODO: more robust data exchange, double-check with @Stef
                     // TODO: `statusError` does not do anything with column of a SketchException
                     val ( msgType, msgText, msgFile, msgLine, msgCol ) = line.split("|")