Consider last line only when probing for command

This ignores any user-defined output in an interactive shell that might
precede the output of the command.

Author: stephanmax

p5js/src/main/kotlin/p5jsEditor.kt

@@ -103,7 +103,7 @@ class p5jsEditor(base: Base, path: String?, state: EditorState?, mode: Mode?) :
             throw RuntimeException("Command failed with non-zero exit code $exitCode.")
         }
 
-        val output = process.inputStream.bufferedReader().use { it.readText() }
+        val output = process.inputStream.bufferedReader().use { it.readLines().last() }
         return output
     }