Some more logic

src/main/java/eu/simstadt/regionchooser/RegionChooserCommandLineInterface.java

 package eu.simstadt.regionchooser;
 
+import java.io.BufferedWriter;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
 import java.util.Scanner;
@@ -29,24 +31,34 @@ class RegionChooserCommandLineInterface implements Callable<Integer>
 
 	@Override
 	public Integer call() throws Exception { // your business logic goes here...
-		System.out.println("WKT from : ");
-		System.out.println(wktFile);
 		System.out.println("Should extract from :");
 		for (Path input_citygml : citygmls) {
 			System.out.println("  " + input_citygml);
 		}
 		System.out.print("And write to : ");
 		System.out.println(outputCityGML);
-		System.out.print("in ");
-		System.out.println(espgId + " coordinates.");
+		try (BufferedWriter bf = Files.newBufferedWriter(outputCityGML)) {
+			bf.write("HELLO THERE!");
+		}
+		if (espgId == null) {
+			System.out.println("coordinates from " + citygmls.get(0));
+		} else {
+			System.out.print("in EPSG:");
+			System.out.println(espgId + " coordinates.");
+		}
 
-		if (System.in.available() == 0) {
-			System.out.println("OH NOEs, NO INPUT!");
+		if (wktFile.equals("-")) {
+			if (System.in.available() == 0) {
+				System.out.println("OH NOEs, NO INPUT!");
+			} else {
+				System.out.println("Here's standard input:");
+				System.out.println(getInput());
+				System.out.println("Done");
+			}
 		} else {
-			System.out.println("Here's standard input:");
-			System.out.println(getInput());
-			System.out.println("Done");
+			System.out.println("Try to read from " + wktFile);
 		}
+
 		return 0;
 	}