* simplistic output redirection for logging purposes

source/net/sourceforge/filebot/Main.java

@@ -15,6 +15,7 @@ import java.awt.event.ActionEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.io.File;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.lang.reflect.InvocationTargetException;
@@ -61,8 +62,8 @@ import net.sourceforge.filebot.ui.transfer.FileTransferable;
 import net.sourceforge.filebot.web.CachedResource;
 import net.sourceforge.tuned.ByteBufferInputStream;
 import net.sourceforge.tuned.PreferencesMap.PreferencesEntry;
+import net.sourceforge.tuned.TeePrintStream;
 
-import org.kohsuke.args4j.CmdLineException;
 import org.w3c.dom.NodeList;
 
 
@@ -77,6 +78,13 @@ public class Main {
 			final ArgumentProcessor cli = new ArgumentProcessor();
 			final ArgumentBean args = cli.parse(arguments);
 			
+			// tee stdout and stderr to log file if set
+			if (args.logFile != null) {
+				FileOutputStream log = new FileOutputStream(args.getLogFile(), true);
+				System.setOut(new TeePrintStream(log, true, "UTF-8", System.out));
+				System.setErr(new TeePrintStream(log, true, "UTF-8", System.err));
+			}
+			
 			if (args.printHelp() || args.printVersion() || (!args.runCLI() && isHeadless())) {
 				System.out.format("%s / %s%n%n", getApplicationIdentifier(), getJavaRuntimeIdentifier());
 				
@@ -203,7 +211,7 @@ public class Main {
 					Logger.getLogger(Main.class.getName()).log(Level.WARNING, "Failed to check for updates", e);
 				}
 			}
-		} catch (CmdLineException e) {
+		} catch (Exception e) {
 			// illegal arguments => just print CLI error message and stop
 			System.err.println(e.getMessage());
 			System.exit(-1);

source/net/sourceforge/filebot/cli/ArgumentBean.java

@@ -6,6 +6,7 @@ import static java.util.Collections.*;
 import static net.sourceforge.tuned.FileUtilities.*;
 
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
@@ -84,6 +85,9 @@ public class ArgumentBean {
 	@Option(name = "--log", usage = "Log level", metaVar = "[all, config, info, warning]")
 	public String log = "all";
 	
+	@Option(name = "--log-file", usage = "Log file", metaVar = "path/to/log.txt")
+	public String logFile = null;
+	
 	@Option(name = "-r", usage = "Resolve folders recursively")
 	public boolean recursive = false;
 	
@@ -180,4 +184,13 @@ public class ArgumentBean {
 		return Level.parse(log.toUpperCase());
 	}
 	
+	
+	public File getLogFile() throws IOException {
+		File f = new File(logFile);
+		if (!f.exists() && !f.getParentFile().mkdirs() && !f.createNewFile()) {
+			throw new IOException("Failed to create log file: " + f.getAbsolutePath());
+		}
+		return f;
+	}
+	
 }

source/net/sourceforge/tuned/TeePrintStream.java

@@ -0,0 +1,56 @@
+
+package net.sourceforge.tuned;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.io.UnsupportedEncodingException;
+
+
+public class TeePrintStream extends PrintStream {
+	
+	private final PrintStream cc;
+	
+	
+	public TeePrintStream(OutputStream out, boolean autoFlush, String encoding, PrintStream cc) throws UnsupportedEncodingException {
+		super(out, autoFlush, encoding);
+		this.cc = cc;
+	}
+	
+	
+	@Override
+	public void close() {
+		super.close();
+		cc.close();
+	}
+	
+	
+	@Override
+	public void flush() {
+		super.flush();
+		cc.flush();
+	}
+	
+	
+	@Override
+	public void write(byte[] buf, int off, int len) {
+		super.write(buf, off, len);
+		cc.write(buf, off, len);
+	}
+	
+	
+	@Override
+	public void write(int b) {
+		super.write(b);
+		cc.write(b);
+	}
+	
+	
+	@Override
+	public void write(byte[] b) throws IOException {
+		super.write(b);
+		cc.write(b);
+	}
+	
+}