/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package list;

import java.io.File;
import java.util.Collection;
import java.util.Iterator;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

public final class Main {
    private static Options getOptions() {
        Option dir = OptionBuilder.withArgName("dir")
            .hasArg()
            .withDescription("list files in given dir")
            .create("dir");
        Options options = new Options();

        options.addOption(dir);
        
        return options;
    }
    
    public static void main(String[] args) throws Exception {
      Options options = getOptions();
      try {
        
        CommandLineParser parser = new GnuParser();

        CommandLine line = parser.parse(options, args);
        File dir = new File(line.getOptionValue("dir", "."));
        Collection files = ListFile.list(dir);
        System.out.println("listing files in " + dir);
        for (Iterator it = files.iterator(); it.hasNext();) {
          System.out.println("\t" + it.next() + "\n");
        }
      } catch (ParseException exp) {
          // oops, something went wrong
          System.err.println("Parsing failed.  Reason: " + exp.getMessage());
          
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("list", options);
      }        
    }
    
    private Main() {
    }
            
}
