Copyright (c) 2005, 2016 IBM Corporation and others.
 This program and the accompanying materials
 are made available under the terms of the Eclipse Public License 2.0
 which accompanies this distribution, and is available at
 https://www.eclipse.org/legal/epl-2.0/
 SPDX-License-Identifier: EPL-2.0
 Contributors:
    Ben Konrath  - initial implementation
    Red Hat Incorporated - improvements based on comments from JDT developers
    IBM Corporation - Code review and integration
    IBM Corporation - Fix for 340181
/*******************************************************************************
 *  Copyright (c) 2005, 2016 IBM Corporation and others.
 *
 *  This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License 2.0
 *  which accompanies this distribution, and is available at
 *  https://www.eclipse.org/legal/epl-2.0/
 *
 *  SPDX-License-Identifier: EPL-2.0
 * 
 *  Contributors:
 *     Ben Konrath <ben@bagu.org> - initial implementation
 *     Red Hat Incorporated - improvements based on comments from JDT developers
 *     IBM Corporation - Code review and integration
 *     IBM Corporation - Fix for 340181
 *******************************************************************************/
package org.eclipse.jdt.core.formatter;

import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Map;
import java.util.Properties;

import org.eclipse.equinox.app.IApplication;
import org.eclipse.equinox.app.IApplicationContext;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.internal.compiler.env.IModule;
import org.eclipse.jdt.internal.core.util.Util;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.IDocument;
import org.eclipse.osgi.util.NLS;
import org.eclipse.text.edits.TextEdit;

Implements an Eclipse Application for org.eclipse.jdt.core.JavaCodeFormatter.
On MacOS, when invoked using the Eclipse executable, the "user.dir" property is set to the folder
in which the eclipse.ini file is located. This makes it harder to use relative paths to point to the 
files to be formatted or the configuration file to use to set the code formatter's options.
There are a couple improvements that could be made: 1. Make a list of all the
files first so that a file does not get formatted twice. 2. Use a text based
progress monitor for output.
Author:
Ben Konrath 
Since:
3.2
@noinstantiate
This class is not intended to be instantiated by clients.
@noextend
This class is not intended to be subclassed by clients./**
 * Implements an Eclipse Application for org.eclipse.jdt.core.JavaCodeFormatter.
 * 
 * <p>On MacOS, when invoked using the Eclipse executable, the "user.dir" property is set to the folder
 * in which the eclipse.ini file is located. This makes it harder to use relative paths to point to the 
 * files to be formatted or the configuration file to use to set the code formatter's options.</p>
 *
 * <p>There are a couple improvements that could be made: 1. Make a list of all the
 * files first so that a file does not get formatted twice. 2. Use a text based
 * progress monitor for output.</p>
 *
 * @author Ben Konrath <bkonrath@redhat.com>
 * @since 3.2
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @noextend This class is not intended to be subclassed by clients.
 */
@SuppressWarnings({"rawtypes", "unchecked"})
public class CodeFormatterApplication implements IApplication {

	
Deals with the messages in the properties file (cut n' pasted from a
generated class).
/**
	 * Deals with the messages in the properties file (cut n' pasted from a
	 * generated class).
	 */
	private final static class Messages extends NLS {
		private static final String BUNDLE_NAME = "org.eclipse.jdt.core.formatter.messages";//$NON-NLS-1$

		public static String CommandLineConfigFile;

		public static String CommandLineDone;

		public static String CommandLineErrorConfig;

		public static String CommandLineErrorFileTryFullPath;

		public static String CommandLineErrorFile;

		public static String CommandLineErrorFileDir;

		public static String CommandLineErrorQuietVerbose;

		public static String CommandLineErrorNoConfigFile;

		public static String CommandLineFormatting;

		public static String CommandLineStart;

		public static String CommandLineUsage;

		public static String ConfigFileNotFoundErrorTryFullPath;

		public static String ConfigFileReadingError;

		public static String FormatProblem;

		public static String CaughtException;

		public static String ExceptionSkip;

		static {
			NLS.initializeMessages(BUNDLE_NAME, Messages.class);
		}

		
Bind the given message's substitution locations with the given string
values.
Params:
message – 
           the message to be manipulated
Returns:
the manipulated String/**
		 * Bind the given message's substitution locations with the given string
		 * values.
		 *
		 * @param message
		 *            the message to be manipulated
		 * @return the manipulated String
		 */
		public static String bind(String message) {
			return bind(message, null);
		}

		
Bind the given message's substitution locations with the given string
values.
Params:
message – 
           the message to be manipulated
binding – 
           the object to be inserted into the message
Returns:
the manipulated String/**
		 * Bind the given message's substitution locations with the given string
		 * values.
		 *
		 * @param message
		 *            the message to be manipulated
		 * @param binding
		 *            the object to be inserted into the message
		 * @return the manipulated String
		 */
		public static String bind(String message, Object binding) {
			return bind(message, new Object[] {
				binding
			});
		}

		
Bind the given message's substitution locations with the given string
values.
Params:
message – 
           the message to be manipulated
binding1 – 
           An object to be inserted into the message
binding2 – 
           A second object to be inserted into the message
Returns:
the manipulated String/**
		 * Bind the given message's substitution locations with the given string
		 * values.
		 *
		 * @param message
		 *            the message to be manipulated
		 * @param binding1
		 *            An object to be inserted into the message
		 * @param binding2
		 *            A second object to be inserted into the message
		 * @return the manipulated String
		 */
		public static String bind(String message, Object binding1, Object binding2) {
			return bind(message, new Object[] {
					binding1, binding2
			});
		}

		
Bind the given message's substitution locations with the given string
values.
Params:
message – 
           the message to be manipulated
bindings – 
           An array of objects to be inserted into the message
Returns:
the manipulated String/**
		 * Bind the given message's substitution locations with the given string
		 * values.
		 *
		 * @param message
		 *            the message to be manipulated
		 * @param bindings
		 *            An array of objects to be inserted into the message
		 * @return the manipulated String
		 */
		public static String bind(String message, Object[] bindings) {
			return MessageFormat.format(message, bindings);
		}
	}

	private static final String ARG_CONFIG = "-config"; //$NON-NLS-1$

	private static final String ARG_HELP = "-help"; //$NON-NLS-1$

	private static final String ARG_QUIET = "-quiet"; //$NON-NLS-1$

	private static final String ARG_VERBOSE = "-verbose"; //$NON-NLS-1$

	private String configName;

	private Map options = null;

	private static final String PDE_LAUNCH = "-pdelaunch"; //$NON-NLS-1$

	private boolean quiet = false;

	private boolean verbose = false;

	
Display the command line usage message.
/**
	 * Display the command line usage message.
	 */
	private void displayHelp() {
		System.out.println(Messages.bind(Messages.CommandLineUsage));
	}

	private void displayHelp(String message) {
		System.err.println(message);
		System.out.println();
		displayHelp();
	}

	
Recursively format the Java source code that is contained in the
directory rooted at dir.
/**
	 * Recursively format the Java source code that is contained in the
	 * directory rooted at dir.
	 */
	private void formatDirTree(File dir, CodeFormatter codeFormatter) {

		File[] files = dir.listFiles();
		if (files == null)
			return;

		for (int i = 0; i < files.length; i++) {
			File file = files[i];
			if (file.isDirectory()) {
				formatDirTree(file, codeFormatter);
			} else if (Util.isJavaLikeFileName(file.getPath())) {
				formatFile(file, codeFormatter);
			}
		}
	}

	
Format the given Java source file.
/**
	 * Format the given Java source file.
	 */
	private void formatFile(File file, CodeFormatter codeFormatter) {
		IDocument doc = new Document();
		try {
			// read the file
			if (this.verbose) {
				System.out.println(Messages.bind(Messages.CommandLineFormatting, file.getAbsolutePath()));
			}
			String contents = new String(org.eclipse.jdt.internal.compiler.util.Util.getFileCharContent(file, null));
			// format the file (the meat and potatoes)
			doc.set(contents);
			int kind = (file.getName().equals(IModule.MODULE_INFO_JAVA)? CodeFormatter.K_MODULE_INFO
					: CodeFormatter.K_COMPILATION_UNIT) | CodeFormatter.F_INCLUDE_COMMENTS;
			TextEdit edit = codeFormatter.format(kind, contents, 0, contents.length(), 0, null);
			if (edit != null) {
				edit.apply(doc);
			} else {
				System.err.println(Messages.bind(Messages.FormatProblem, file.getAbsolutePath()));
				return;
			}

			// write the file
			final BufferedWriter out = new BufferedWriter(new FileWriter(file));
			try {
				out.write(doc.get());
				out.flush();
			} finally {
				try {
					out.close();
				} catch (IOException e) {
					/* ignore */
				}
			}
		} catch (IOException e) {
			String errorMessage = Messages.bind(Messages.CaughtException, "IOException", e.getLocalizedMessage()); //$NON-NLS-1$
			Util.log(e, errorMessage);
			System.err.println(Messages.bind(Messages.ExceptionSkip ,errorMessage));
		} catch (BadLocationException e) {
			String errorMessage = Messages.bind(Messages.CaughtException, "BadLocationException", e.getLocalizedMessage()); //$NON-NLS-1$
			Util.log(e, errorMessage);
			System.err.println(Messages.bind(Messages.ExceptionSkip ,errorMessage));
		}
	}

	private File[] processCommandLine(String[] argsArray) {

		ArrayList args = new ArrayList();
		for (int i = 0, max = argsArray.length; i < max; i++) {
			args.add(argsArray[i]);
		}
		int index = 0;
		final int argCount = argsArray.length;

		final int DEFAULT_MODE = 0;
		final int CONFIG_MODE = 1;

		int mode = DEFAULT_MODE;
		final int INITIAL_SIZE = 1;
		int fileCounter = 0;

		File[] filesToFormat = new File[INITIAL_SIZE];

		loop: while (index < argCount) {
			String currentArg = argsArray[index++];

			switch(mode) {
				case DEFAULT_MODE :
					if (PDE_LAUNCH.equals(currentArg)) {
						continue loop;
					}
					if (ARG_HELP.equals(currentArg)) {
						displayHelp();
						return null;
					}
					if (ARG_VERBOSE.equals(currentArg)) {
						this.verbose = true;
						continue loop;
					}
					if (ARG_QUIET.equals(currentArg)) {
						this.quiet = true;
						continue loop;
					}
					if (ARG_CONFIG.equals(currentArg)) {
						mode = CONFIG_MODE;
						continue loop;
					}
					// the current arg should be a file or a directory name
					File file = new File(currentArg);
					if (file.exists()) {
						if (filesToFormat.length == fileCounter) {
							System.arraycopy(filesToFormat, 0, (filesToFormat = new File[fileCounter * 2]), 0, fileCounter);
						}
						filesToFormat[fileCounter++] = file;
					} else {
						String canonicalPath;
						try {
							canonicalPath = file.getCanonicalPath();
						} catch(IOException e2) {
							canonicalPath = file.getAbsolutePath();
						}
						String errorMsg = file.isAbsolute()?
										  Messages.bind(Messages.CommandLineErrorFile, canonicalPath):
										  Messages.bind(Messages.CommandLineErrorFileTryFullPath, canonicalPath);
						displayHelp(errorMsg);
						return null;
					}
					break;
				case CONFIG_MODE :
					this.configName = currentArg;
					this.options = readConfig(currentArg);
					if (this.options == null) {
						displayHelp(Messages.bind(Messages.CommandLineErrorConfig, currentArg));
						return null;
					}
					mode = DEFAULT_MODE;
					continue loop;
			}
		}

		if (mode == CONFIG_MODE || this.options == null) {
			displayHelp(Messages.bind(Messages.CommandLineErrorNoConfigFile));
			return null;
		}
		if (this.quiet && this.verbose) {
			displayHelp(
				Messages.bind(
					Messages.CommandLineErrorQuietVerbose,
					new String[] { ARG_QUIET, ARG_VERBOSE }
				));
			return null;
		}
		if (fileCounter == 0) {
			displayHelp(Messages.bind(Messages.CommandLineErrorFileDir));
			return null;
		}
		if (filesToFormat.length != fileCounter) {
			System.arraycopy(filesToFormat, 0, (filesToFormat = new File[fileCounter]), 0, fileCounter);
		}
		return filesToFormat;
	}

	
Return a Java Properties file representing the options that are in the
specified configuration file.
/**
	 * Return a Java Properties file representing the options that are in the
	 * specified configuration file.
	 */
	private Properties readConfig(String filename) {
		BufferedInputStream stream = null;
		File configFile = new File(filename);
		try {
			stream = new BufferedInputStream(new FileInputStream(configFile));
			final Properties formatterOptions = new Properties();
			formatterOptions.load(stream);
			return formatterOptions;
		} catch (IOException e) {
			String canonicalPath = null;
			try {
				canonicalPath = configFile.getCanonicalPath();
			} catch(IOException e2) {
				canonicalPath = configFile.getAbsolutePath();
			}
			String errorMessage;
			if (!configFile.exists() && !configFile.isAbsolute()) {
				errorMessage = Messages.bind(Messages.ConfigFileNotFoundErrorTryFullPath, new Object[] {
					canonicalPath,
					System.getProperty("user.dir") //$NON-NLS-1$
				});

			} else {
				errorMessage = Messages.bind(Messages.ConfigFileReadingError, canonicalPath);
			}
			Util.log(e, errorMessage);
			System.err.println(errorMessage);
		} finally {
			if (stream != null) {
				try {
					stream.close();
				} catch (IOException e) {
					/* ignore */
				}
			}
		}
		return null;
	}

	
Runs the Java code formatter application
/**
	 * Runs the Java code formatter application
	 */
	@Override
	public Object start(IApplicationContext context) throws Exception {
		File[] filesToFormat = processCommandLine((String[]) context.getArguments().get(IApplicationContext.APPLICATION_ARGS));

		if (filesToFormat == null) {
			return IApplication.EXIT_OK;
		}

		if (!this.quiet) {
			if (this.configName != null) {
				System.out.println(Messages.bind(Messages.CommandLineConfigFile, this.configName));
			}
			System.out.println(Messages.bind(Messages.CommandLineStart));
		}

		final CodeFormatter codeFormatter = ToolFactory.createCodeFormatter(this.options,
				ToolFactory.M_FORMAT_EXISTING);
		// format the list of files and/or directories
		for (int i = 0, max = filesToFormat.length; i < max; i++) {
			final File file = filesToFormat[i];
			if (file.isDirectory()) {
				formatDirTree(file, codeFormatter);
			} else if (Util.isJavaLikeFileName(file.getPath())) {
				formatFile(file, codeFormatter);
			}
		}
		if (!this.quiet) {
			System.out.println(Messages.bind(Messages.CommandLineDone));
		}

		return IApplication.EXIT_OK;
	}
	@Override
	public void stop() {
		// do nothing
	}
}