delete temp file on Tabulate Window close

src/main/java/network/brightspots/rcv/GuiConfigController.java

@@ -456,7 +456,7 @@ public String saveFile(Button fromButton, boolean useTemporaryFile) {
     Stage stage = (Stage) fromButton.getScene().getWindow();
     File outputFile;
     if (useTemporaryFile) {
-      outputFile = new File(selectedFile.getAbsolutePath() + ".temp");
+      outputFile = getTemporaryFile();
       saveFile(outputFile);
     } else {
       outputFile = getSaveFile(stage);
@@ -477,6 +477,15 @@ private void saveFile(File fileToSave) {
     loadFile(fileToSave, true);
   }
 
+  /**
+   * Where the temporary config files will be placed if saveFile's useTemporaryFile flag is used.
+   *
+   * @return A file that may or may not currently exist on disk
+   */
+  public File getTemporaryFile() {
+    return new File(selectedFile.getAbsolutePath() + ".temp");
+  }
+
   /**
    * Action when save menu item is clicked.
    */
@@ -603,6 +612,7 @@ private void openTabulateWindow() {
       window.setScene(new Scene(root));
       window.setX(GuiContext.getInstance().getMainWindow().getX() + 50);
       window.setY(GuiContext.getInstance().getMainWindow().getY() + 50);
+      window.setOnHiding((event) -> controller.cleanUp());
       window.showAndWait();
     } catch (IOException exception) {
       StringWriter sw = new StringWriter();

src/main/java/network/brightspots/rcv/GuiTabulateController.java

@@ -16,7 +16,9 @@
 
 package network.brightspots.rcv;
 
+import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import javafx.concurrent.Service;
 import javafx.concurrent.WorkerStateEvent;
 import javafx.event.ActionEvent;
@@ -101,6 +103,21 @@ public void initialize(GuiConfigController controller, int numCandidates, int nu
     updateProgressText();
   }
 
+  /**
+   * Call this before closing the window to delete any lingering temp files.
+   */
+  public void cleanUp() {
+    if (useTemporaryConfigBeforeTabulation) {
+      try {
+        File tempFile = guiConfigController.getTemporaryFile();
+        Files.deleteIfExists(tempFile.toPath());
+      } catch (IOException e) {
+        Logger.severe("Could not delete temporary config file: " + e.getMessage());
+        throw new RuntimeException(e);
+      }
+    }
+  }
+
   /**
    * Action when a letter is typed in the name field.
    *