groovy-core/src/main/groovy/ui/GroovyMain.java - groovy - Git at Google

 /*
  $Id$

  Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.

  Redistribution and use of this software and associated documentation
  ("Software"), with or without modification, are permitted provided
  that the following conditions are met:

  1. Redistributions of source code must retain copyright
  statements and notices.  Redistributions must also contain a
  copy of this document.

  2. Redistributions in binary form must reproduce the
  above copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

  3. The name "groovy" must not be used to endorse or promote
  products derived from this Software without prior written
  permission of The Codehaus.  For written permission,
  please contact info@codehaus.org.

  4. Products derived from this Software may not be called "groovy"
  nor may "groovy" appear in their names without prior written
  permission of The Codehaus. "groovy" is a registered
  trademark of The Codehaus.

  5. Due credit should be given to The Codehaus -
  http://groovy.codehaus.org/

  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  OF THE POSSIBILITY OF SUCH DAMAGE.

  */
 package groovy.ui;

 import groovy.lang.GroovyShell;
 import groovy.lang.MetaClass;
 import groovy.lang.Script;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.util.Iterator;
 import java.util.List;
 import java.math.BigInteger;

 import org.apache.commons.cli.CommandLine;
 import org.apache.commons.cli.CommandLineParser;
 import org.apache.commons.cli.HelpFormatter;
 import org.apache.commons.cli.OptionBuilder;
 import org.apache.commons.cli.Options;
 import org.apache.commons.cli.ParseException;
 import org.apache.commons.cli.PosixParser;
 import org.codehaus.groovy.control.CompilationFailedException;
 import org.codehaus.groovy.control.CompilerConfiguration;
 import org.codehaus.groovy.runtime.InvokerHelper;
 import org.codehaus.groovy.runtime.InvokerInvocationException;

 /**
  * A Command line to execute groovy.
  *
  * @author Jeremy Rayner
  * @author Yuri Schimke
  * @version $Revision$
  */
 public class GroovyMain {
     // arguments to the script
     private List args;

     // is this a file on disk
     private boolean isScriptFile;

     // filename or content of script
     private String script;

     // process args as input files
     private boolean processFiles;

     // edit input files in place
     private boolean editFiles;

     // automatically output the result of each script
     private boolean autoOutput;

     // automatically split each line using the splitpattern
     private boolean autoSplit;

     // The pattern used to split the current line
     private String splitPattern = " ";

     // process sockets
     private boolean processSockets;

     // port to listen on when processing sockets
     private int port;

     // backup input files with extension
     private String backupExtension;

     // do you want full stack traces in script exceptions?
     private boolean debug = false;

     // Compiler configuration, used to set the encodings of the scripts/classes
     private CompilerConfiguration conf = new CompilerConfiguration();

     /**
      * Main CLI interface.
      *
      * @param args all command line args.
      */
     public static void main(String args[]) {
         MetaClass.setUseReflection(true);

         Options options = buildOptions();

         try {
             CommandLine cmd = parseCommandLine(options, args);

             if (cmd.hasOption('h')) {
                 HelpFormatter formatter = new HelpFormatter();
                 formatter.printHelp("groovy", options);
             } else if (cmd.hasOption('v')) {
                 String version = InvokerHelper.getVersion();
                 System.out.println("Groovy Version: " + version + " JVM: " + System.getProperty("java.vm.version"));
             } else {
                 // If we fail, then exit with an error so scripting frameworks can catch it
                 if (!process(cmd)) {
                     System.exit(1);
                 }
             }
         } catch (ParseException pe) {
             System.out.println("error: " + pe.getMessage());
             HelpFormatter formatter = new HelpFormatter();
             formatter.printHelp("groovy", options);
         }
     }

     /**
      * Parse the command line.
      *
      * @param options the options parser.
      * @param args    the command line args.
      * @return parsed command line.
      * @throws ParseException if there was a problem.
      */
     private static CommandLine parseCommandLine(Options options, String[] args) throws ParseException {
         CommandLineParser parser = new PosixParser();
         CommandLine cmd = parser.parse(options, args, true);
         return cmd;
     }

     /**
      * Build the options parser.  Has to be synchronized because of the way Options are constructed.
      *
      * @return an options parser.
      */
     private static synchronized Options buildOptions() {
         Options options = new Options();

         options.addOption(
             OptionBuilder.hasArg(false)
             .withDescription("usage information")
             .withLongOpt("help")
             .create('h'));
         options.addOption(
             OptionBuilder.hasArg(false)
             .withDescription("debug mode will print out full stack traces")
             .withLongOpt("debug")
             .create('d'));
         options.addOption(
             OptionBuilder.hasArg(false)
             .withDescription("display the Groovy and JVM versions")
             .withLongOpt("version")
             .create('v'));
         options.addOption(
             OptionBuilder.withArgName("charset")
             .hasArg()
             .withDescription("specify the encoding of the files")
             .withLongOpt("encoding")
             .create('c'));
         options.addOption(
             OptionBuilder.withArgName("script")
             .hasArg()
             .withDescription("specify a command line script")
             .create('e'));
         options.addOption(
             OptionBuilder.withArgName("extension")
             .hasOptionalArg()
             .withDescription("modify files in place, create backup if extension is given (e.g. \'.bak\')")
             .create('i'));
         options.addOption(
             OptionBuilder.hasArg(false)
             .withDescription("process files line by line")
             .create('n'));
         options.addOption(
             OptionBuilder.hasArg(false)
             .withDescription("process files line by line and print result")
             .create('p'));
         options.addOption(
             OptionBuilder.withArgName("port")
             .hasOptionalArg()
             .withDescription("listen on a port and process inbound lines")
             .create('l'));
         options.addOption(
                 OptionBuilder.withArgName("splitPattern")
                 .hasOptionalArg()
                 .withDescription("automatically split current line (defaults to '\\s'")
                 .withLongOpt("autosplit")
                 .create('a'));
         return options;
     }

     /**
      * Process the users request.
      *
      * @param line the parsed command line.
      * @throws ParseException if invalid options are chosen
      */
     private static boolean process(CommandLine line) throws ParseException {
         GroovyMain main = new GroovyMain();

         List args = line.getArgList();

         // add the ability to parse scripts with a specified encoding
         if (line.hasOption('c')) {
             main.conf.setSourceEncoding(line.getOptionValue("encoding"));
         }

         main.isScriptFile = !line.hasOption('e');
         main.debug = line.hasOption('d');
         main.conf.setDebug(main.debug);
         main.processFiles = line.hasOption('p') || line.hasOption('n');
         main.autoOutput = line.hasOption('p');
         main.editFiles = line.hasOption('i');
         if (main.editFiles) {
             main.backupExtension = line.getOptionValue('i');
         }
         main.autoSplit = line.hasOption('a');
         String sp = line.getOptionValue('a');
         if (sp != null)
             main.splitPattern = sp;

         if (main.isScriptFile) {
             if (args.isEmpty())
                 throw new ParseException("neither -e or filename provided");

             main.script = (String) args.remove(0);
             if (main.script.endsWith(".java"))
                 throw new ParseException("error: cannot compile file with .java extension: " + main.script);
         } else {
             main.script = line.getOptionValue('e');
         }

         main.processSockets = line.hasOption('l');
         if (main.processSockets) {
             String p = line.getOptionValue('l', "1960"); // default port to listen to
             main.port = new Integer(p).intValue();
         }
         main.args = args;

         return main.run();
     }


     /**
      * Run the script.
      */
     private boolean run() {
         try {
             if (processSockets) {
                 processSockets();
             } else if (processFiles) {
                 processFiles();
             } else {
                 processOnce();
             }
             return true;
         } catch (CompilationFailedException e) {
             System.err.println(e);
             return false;
         } catch (Throwable e) {
             if (e instanceof InvokerInvocationException) {
                 InvokerInvocationException iie = (InvokerInvocationException) e;
                 e = iie.getCause();
             }
             System.err.println("Caught: " + e);
             if (debug) {
                 e.printStackTrace();
             } else {
                 StackTraceElement[] stackTrace = e.getStackTrace();
                 for (int i = 0; i < stackTrace.length; i++) {
                     StackTraceElement element = stackTrace[i];
                     String fileName = element.getFileName();
                     if (fileName!=null && !fileName.endsWith(".java")) {
                         System.err.println("\tat " + element);
                     }
                 }
             }
             return false;
         }
     }

     /**
      * Process Sockets.
      */
     private void processSockets() throws CompilationFailedException, IOException {
         GroovyShell groovy = new GroovyShell(conf);
         //check the script is currently valid before starting a server against the script
         if (isScriptFile) {
             groovy.parse(new FileInputStream(huntForTheScriptFile(script)));
         } else {
             groovy.parse(script);
         }
         new GroovySocketServer(groovy, isScriptFile, script, autoOutput, port);
     }

     /**
      * Hunt for the script file, doesn't bother if it is named precisely.
      *
      * Tries in this order:
      * - actual supplied name
      * - name.groovy
      * - name.gvy
      * - name.gy
      * - name.gsh
      */
     public File huntForTheScriptFile(String scriptFileName) {
         File scriptFile = new File(scriptFileName);
         String[] standardExtensions = {".groovy",".gvy",".gy",".gsh"};
         int i = 0;
         while (i < standardExtensions.length && !scriptFile.exists()) {
             scriptFile = new File(scriptFileName + standardExtensions[i]);
             i++;
         }
         // if we still haven't found the file, point back to the originally specified filename
         if (!scriptFile.exists()) {
             scriptFile = new File(scriptFileName);
         }
         return scriptFile;
     }

     /**
      * Process the input files.
      */
     private void processFiles() throws CompilationFailedException, IOException {
         GroovyShell groovy = new GroovyShell(conf);

         Script s = null;

         if (isScriptFile) {
             s = groovy.parse(huntForTheScriptFile(script));
         } else {
             s = groovy.parse(script, "main");
         }

         if (args.isEmpty()) {
             BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
             PrintWriter writer = new PrintWriter(System.out);

             try {
                 processReader(s, reader, writer);
             } finally {
                 reader.close();
                 writer.close();
             }

         } else {
             Iterator i = args.iterator();
             while (i.hasNext()) {
                 String filename = (String) i.next();
                 File file = huntForTheScriptFile(filename);
                 processFile(s, file);
             }
         }
     }

     /**
      * Process a single input file.
      *
      * @param s    the script to execute.
      * @param file the input file.
      */
     private void processFile(Script s, File file) throws IOException {
         if (!file.exists())
             throw new FileNotFoundException(file.getName());

         if (!editFiles) {
             BufferedReader reader = new BufferedReader(new FileReader(file));
             try {
                 PrintWriter writer = new PrintWriter(System.out);
                 processReader(s, reader, writer);
                 writer.flush();
             } finally {
                 reader.close();
             }
         } else {
             File backup = null;
             if (backupExtension == null) {
                 backup = File.createTempFile("groovy_", ".tmp");
                 backup.deleteOnExit();
             } else {
                 backup = new File(file.getPath() + backupExtension);
             }
             backup.delete();
             if (!file.renameTo(backup))
                 throw new IOException("unable to rename " + file + " to " + backup);

             BufferedReader reader = new BufferedReader(new FileReader(backup));
             try {
                 PrintWriter writer = new PrintWriter(new FileWriter(file));
                 try {
                     processReader(s, reader, writer);
                 } finally {
                     writer.close();
                 }
             } finally {
                 reader.close();
             }
         }
     }

     /**
      * Process a script against a single input file.
      *
      * @param s      script to execute.
      * @param reader input file.
      * @param pw     output sink.
      */
     private void processReader(Script s, BufferedReader reader, PrintWriter pw) throws IOException {
         String line = null;
         String lineCountName = "count";
         s.setProperty(lineCountName, BigInteger.ZERO);
         String autoSplitName = "split";
         s.setProperty("out", pw);
         while ((line = reader.readLine()) != null) {
             s.setProperty("line", line);
             s.setProperty(lineCountName,
                     ((BigInteger)s.getProperty(lineCountName)).add(BigInteger.ONE));
             if(autoSplit)
                 s.setProperty(autoSplitName, line.split(splitPattern));
             Object o = s.run();

             if (autoOutput) {
                 pw.println(o);
             }
         }
     }

     private static ClassLoader getLoader(ClassLoader cl) {
         if (cl!=null) return cl;
         cl = Thread.currentThread().getContextClassLoader();
         if (cl!=null) return cl;
         cl = GroovyMain.class.getClassLoader();
         if (cl!=null) return cl;
         return null;
     }

     /**
      * Process the standard, single script with args.
      */
     private void processOnce() throws CompilationFailedException, IOException {
         GroovyShell groovy = new GroovyShell(conf);

         if (isScriptFile)
             groovy.run(huntForTheScriptFile(script), args);
         else
             groovy.run(script, "script_from_command_line", args);
     }
 }
	/*
	$Id$

	Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.

	Redistribution and use of this software and associated documentation
	("Software"), with or without modification, are permitted provided
	that the following conditions are met:

	1. Redistributions of source code must retain copyright
	statements and notices. Redistributions must also contain a
	copy of this document.

	2. Redistributions in binary form must reproduce the
	above copyright notice, this list of conditions and the
	following disclaimer in the documentation and/or other
	materials provided with the distribution.

	3. The name "groovy" must not be used to endorse or promote
	products derived from this Software without prior written
	permission of The Codehaus. For written permission,
	please contact info@codehaus.org.

	4. Products derived from this Software may not be called "groovy"
	nor may "groovy" appear in their names without prior written
	permission of The Codehaus. "groovy" is a registered
	trademark of The Codehaus.

	5. Due credit should be given to The Codehaus -
	http://groovy.codehaus.org/

	THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
	``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
	NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
	FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
	THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	OF THE POSSIBILITY OF SUCH DAMAGE.

	*/
	package groovy.ui;

	import groovy.lang.GroovyShell;
	import groovy.lang.MetaClass;
	import groovy.lang.Script;

	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileInputStream;
	import java.io.FileNotFoundException;
	import java.io.FileReader;
	import java.io.FileWriter;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.PrintWriter;
	import java.util.Iterator;
	import java.util.List;
	import java.math.BigInteger;

	import org.apache.commons.cli.CommandLine;
	import org.apache.commons.cli.CommandLineParser;
	import org.apache.commons.cli.HelpFormatter;
	import org.apache.commons.cli.OptionBuilder;
	import org.apache.commons.cli.Options;
	import org.apache.commons.cli.ParseException;
	import org.apache.commons.cli.PosixParser;
	import org.codehaus.groovy.control.CompilationFailedException;
	import org.codehaus.groovy.control.CompilerConfiguration;
	import org.codehaus.groovy.runtime.InvokerHelper;
	import org.codehaus.groovy.runtime.InvokerInvocationException;

	/**
	* A Command line to execute groovy.
	*
	* @author Jeremy Rayner
	* @author Yuri Schimke
	* @version $Revision$
	*/
	public class GroovyMain {
	// arguments to the script
	private List args;

	// is this a file on disk
	private boolean isScriptFile;

	// filename or content of script
	private String script;

	// process args as input files
	private boolean processFiles;

	// edit input files in place
	private boolean editFiles;

	// automatically output the result of each script
	private boolean autoOutput;

	// automatically split each line using the splitpattern
	private boolean autoSplit;

	// The pattern used to split the current line
	private String splitPattern = " ";

	// process sockets
	private boolean processSockets;

	// port to listen on when processing sockets
	private int port;

	// backup input files with extension
	private String backupExtension;

	// do you want full stack traces in script exceptions?
	private boolean debug = false;

	// Compiler configuration, used to set the encodings of the scripts/classes
	private CompilerConfiguration conf = new CompilerConfiguration();

	/**
	* Main CLI interface.
	*
	* @param args all command line args.
	*/
	public static void main(String args[]) {
	MetaClass.setUseReflection(true);

	Options options = buildOptions();

	try {
	CommandLine cmd = parseCommandLine(options, args);

	if (cmd.hasOption('h')) {
	HelpFormatter formatter = new HelpFormatter();
	formatter.printHelp("groovy", options);
	} else if (cmd.hasOption('v')) {
	String version = InvokerHelper.getVersion();
	System.out.println("Groovy Version: " + version + " JVM: " + System.getProperty("java.vm.version"));
	} else {
	// If we fail, then exit with an error so scripting frameworks can catch it
	if (!process(cmd)) {
	System.exit(1);
	}
	}
	} catch (ParseException pe) {
	System.out.println("error: " + pe.getMessage());
	HelpFormatter formatter = new HelpFormatter();
	formatter.printHelp("groovy", options);
	}
	}

	/**
	* Parse the command line.
	*
	* @param options the options parser.
	* @param args the command line args.
	* @return parsed command line.
	* @throws ParseException if there was a problem.
	*/
	private static CommandLine parseCommandLine(Options options, String[] args) throws ParseException {
	CommandLineParser parser = new PosixParser();
	CommandLine cmd = parser.parse(options, args, true);
	return cmd;
	}

	/**
	* Build the options parser. Has to be synchronized because of the way Options are constructed.
	*
	* @return an options parser.
	*/
	private static synchronized Options buildOptions() {
	Options options = new Options();

	options.addOption(
	OptionBuilder.hasArg(false)
	.withDescription("usage information")
	.withLongOpt("help")
	.create('h'));
	options.addOption(
	OptionBuilder.hasArg(false)
	.withDescription("debug mode will print out full stack traces")
	.withLongOpt("debug")
	.create('d'));
	options.addOption(
	OptionBuilder.hasArg(false)
	.withDescription("display the Groovy and JVM versions")
	.withLongOpt("version")
	.create('v'));
	options.addOption(
	OptionBuilder.withArgName("charset")
	.hasArg()
	.withDescription("specify the encoding of the files")
	.withLongOpt("encoding")
	.create('c'));
	options.addOption(
	OptionBuilder.withArgName("script")
	.hasArg()
	.withDescription("specify a command line script")
	.create('e'));
	options.addOption(
	OptionBuilder.withArgName("extension")
	.hasOptionalArg()
	.withDescription("modify files in place, create backup if extension is given (e.g. \'.bak\')")
	.create('i'));
	options.addOption(
	OptionBuilder.hasArg(false)
	.withDescription("process files line by line")
	.create('n'));
	options.addOption(
	OptionBuilder.hasArg(false)
	.withDescription("process files line by line and print result")
	.create('p'));
	options.addOption(
	OptionBuilder.withArgName("port")
	.hasOptionalArg()
	.withDescription("listen on a port and process inbound lines")
	.create('l'));
	options.addOption(
	OptionBuilder.withArgName("splitPattern")
	.hasOptionalArg()
	.withDescription("automatically split current line (defaults to '\\s'")
	.withLongOpt("autosplit")
	.create('a'));
	return options;
	}

	/**
	* Process the users request.
	*
	* @param line the parsed command line.
	* @throws ParseException if invalid options are chosen
	*/
	private static boolean process(CommandLine line) throws ParseException {
	GroovyMain main = new GroovyMain();

	List args = line.getArgList();

	// add the ability to parse scripts with a specified encoding
	if (line.hasOption('c')) {
	main.conf.setSourceEncoding(line.getOptionValue("encoding"));
	}

	main.isScriptFile = !line.hasOption('e');
	main.debug = line.hasOption('d');
	main.conf.setDebug(main.debug);
	main.processFiles = line.hasOption('p') \|\| line.hasOption('n');
	main.autoOutput = line.hasOption('p');
	main.editFiles = line.hasOption('i');
	if (main.editFiles) {
	main.backupExtension = line.getOptionValue('i');
	}
	main.autoSplit = line.hasOption('a');
	String sp = line.getOptionValue('a');
	if (sp != null)
	main.splitPattern = sp;

	if (main.isScriptFile) {
	if (args.isEmpty())
	throw new ParseException("neither -e or filename provided");

	main.script = (String) args.remove(0);
	if (main.script.endsWith(".java"))
	throw new ParseException("error: cannot compile file with .java extension: " + main.script);
	} else {
	main.script = line.getOptionValue('e');
	}

	main.processSockets = line.hasOption('l');
	if (main.processSockets) {
	String p = line.getOptionValue('l', "1960"); // default port to listen to
	main.port = new Integer(p).intValue();
	}
	main.args = args;

	return main.run();
	}


	/**
	* Run the script.
	*/
	private boolean run() {
	try {
	if (processSockets) {
	processSockets();
	} else if (processFiles) {
	processFiles();
	} else {
	processOnce();
	}
	return true;
	} catch (CompilationFailedException e) {
	System.err.println(e);
	return false;
	} catch (Throwable e) {
	if (e instanceof InvokerInvocationException) {
	InvokerInvocationException iie = (InvokerInvocationException) e;
	e = iie.getCause();
	}
	System.err.println("Caught: " + e);
	if (debug) {
	e.printStackTrace();
	} else {
	StackTraceElement[] stackTrace = e.getStackTrace();
	for (int i = 0; i < stackTrace.length; i++) {
	StackTraceElement element = stackTrace[i];
	String fileName = element.getFileName();
	if (fileName!=null && !fileName.endsWith(".java")) {
	System.err.println("\tat " + element);
	}
	}
	}
	return false;
	}
	}

	/**
	* Process Sockets.
	*/
	private void processSockets() throws CompilationFailedException, IOException {
	GroovyShell groovy = new GroovyShell(conf);
	//check the script is currently valid before starting a server against the script
	if (isScriptFile) {
	groovy.parse(new FileInputStream(huntForTheScriptFile(script)));
	} else {
	groovy.parse(script);
	}
	new GroovySocketServer(groovy, isScriptFile, script, autoOutput, port);
	}

	/**
	* Hunt for the script file, doesn't bother if it is named precisely.
	*
	* Tries in this order:
	* - actual supplied name
	* - name.groovy
	* - name.gvy
	* - name.gy
	* - name.gsh
	*/
	public File huntForTheScriptFile(String scriptFileName) {
	File scriptFile = new File(scriptFileName);
	String[] standardExtensions = {".groovy",".gvy",".gy",".gsh"};
	int i = 0;
	while (i < standardExtensions.length && !scriptFile.exists()) {
	scriptFile = new File(scriptFileName + standardExtensions[i]);
	i++;
	}
	// if we still haven't found the file, point back to the originally specified filename
	if (!scriptFile.exists()) {
	scriptFile = new File(scriptFileName);
	}
	return scriptFile;
	}

	/**
	* Process the input files.
	*/
	private void processFiles() throws CompilationFailedException, IOException {
	GroovyShell groovy = new GroovyShell(conf);

	Script s = null;

	if (isScriptFile) {
	s = groovy.parse(huntForTheScriptFile(script));
	} else {
	s = groovy.parse(script, "main");
	}

	if (args.isEmpty()) {
	BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
	PrintWriter writer = new PrintWriter(System.out);

	try {
	processReader(s, reader, writer);
	} finally {
	reader.close();
	writer.close();
	}

	} else {
	Iterator i = args.iterator();
	while (i.hasNext()) {
	String filename = (String) i.next();
	File file = huntForTheScriptFile(filename);
	processFile(s, file);
	}
	}
	}

	/**
	* Process a single input file.
	*
	* @param s the script to execute.
	* @param file the input file.
	*/
	private void processFile(Script s, File file) throws IOException {
	if (!file.exists())
	throw new FileNotFoundException(file.getName());

	if (!editFiles) {
	BufferedReader reader = new BufferedReader(new FileReader(file));
	try {
	PrintWriter writer = new PrintWriter(System.out);
	processReader(s, reader, writer);
	writer.flush();
	} finally {
	reader.close();
	}
	} else {
	File backup = null;
	if (backupExtension == null) {
	backup = File.createTempFile("groovy_", ".tmp");
	backup.deleteOnExit();
	} else {
	backup = new File(file.getPath() + backupExtension);
	}
	backup.delete();
	if (!file.renameTo(backup))
	throw new IOException("unable to rename " + file + " to " + backup);

	BufferedReader reader = new BufferedReader(new FileReader(backup));
	try {
	PrintWriter writer = new PrintWriter(new FileWriter(file));
	try {
	processReader(s, reader, writer);
	} finally {
	writer.close();
	}
	} finally {
	reader.close();
	}
	}
	}

	/**
	* Process a script against a single input file.
	*
	* @param s script to execute.
	* @param reader input file.
	* @param pw output sink.
	*/
	private void processReader(Script s, BufferedReader reader, PrintWriter pw) throws IOException {
	String line = null;
	String lineCountName = "count";
	s.setProperty(lineCountName, BigInteger.ZERO);
	String autoSplitName = "split";
	s.setProperty("out", pw);
	while ((line = reader.readLine()) != null) {
	s.setProperty("line", line);
	s.setProperty(lineCountName,
	((BigInteger)s.getProperty(lineCountName)).add(BigInteger.ONE));
	if(autoSplit)
	s.setProperty(autoSplitName, line.split(splitPattern));
	Object o = s.run();

	if (autoOutput) {
	pw.println(o);
	}
	}
	}

	private static ClassLoader getLoader(ClassLoader cl) {
	if (cl!=null) return cl;
	cl = Thread.currentThread().getContextClassLoader();
	if (cl!=null) return cl;
	cl = GroovyMain.class.getClassLoader();
	if (cl!=null) return cl;
	return null;
	}

	/**
	* Process the standard, single script with args.
	*/
	private void processOnce() throws CompilationFailedException, IOException {
	GroovyShell groovy = new GroovyShell(conf);

	if (isScriptFile)
	groovy.run(huntForTheScriptFile(script), args);
	else
	groovy.run(script, "script_from_command_line", args);
	}
	}