Add purge backup files menu entry

src/uk/co/majenko/audiobookrecorder/AudiobookRecorder.java

@@ -58,6 +58,7 @@ public class AudiobookRecorder extends JFrame {
 
     JMenuItem bookNewChapter;
     JMenuItem bookExportAudio;
+    JMenuItem bookPurgeBackups;
     JMenu bookVisitACX;
     JMenuItem bookVisitTitle;
     JMenuItem bookVisitAudition;
@@ -212,8 +213,16 @@ public class AudiobookRecorder extends JFrame {
             }
         });
 
+        bookPurgeBackups = new JMenuItem("Purge Backups");
+        bookPurgeBackups.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent e) {
+                book.purgeBackups();
+            }
+        });
+
         bookMenu.add(bookNewChapter);
         bookMenu.add(bookExportAudio);
+        bookMenu.add(bookPurgeBackups);
 
         bookVisitACX = new JMenu("Visit ACX");
         bookMenu.add(bookVisitACX);

src/uk/co/majenko/audiobookrecorder/Book.java

@@ -206,4 +206,14 @@ public class Book extends DefaultMutableTreeNode {
         return out;
     }
 
+    public void purgeBackups() {
+        for (Enumeration o = children(); o.hasMoreElements();) {
+            Object ob = (Object)o.nextElement();
+            if (ob instanceof Chapter) {
+                Chapter c = (Chapter)ob;
+                c.purgeBackups();
+            }
+        }
+    }
+
 }

src/uk/co/majenko/audiobookrecorder/Chapter.java

@@ -239,4 +239,14 @@ public class Chapter extends DefaultMutableTreeNode {
         }
     }
 
+    public void purgeBackups() {
+        for (Enumeration o = children(); o.hasMoreElements();) {
+            Object ob = (Object)o.nextElement();
+            if (ob instanceof Sentence) {
+                Sentence s = (Sentence)ob;
+                s.purgeBackups();
+            }
+        }
+    }
+
 }

src/uk/co/majenko/audiobookrecorder/Sentence.java

@@ -1328,4 +1328,17 @@ public class Sentence extends DefaultMutableTreeNode implements Cacheable {
 
         return out;
     }
+
+    public void purgeBackups() {
+        File whereto = getFile().getParentFile();
+        String name = getFile().getName();
+
+        File[] files = whereto.listFiles();
+        for (File f : files) {
+            String fn = f.getName();
+            if (fn.startsWith("backup-") && fn.endsWith("-" + name)) {
+                f.delete();
+            }
+        }
+    }
 }