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1 package list;
2
3 import java.io.File  ;
4 import java.util.Collection ;
5 import java.util.Iterator ;
6
7 import org.apache.commons.cli.CommandLine;
8 import org.apache.commons.cli.CommandLineParser;
9 import org.apache.commons.cli.GnuParser;
10 import org.apache.commons.cli.HelpFormatter;
11 import org.apache.commons.cli.Option;
12 import org.apache.commons.cli.OptionBuilder;
13 import org.apache.commons.cli.Options;
14 import org.apache.commons.cli.ParseException;
15
16 public class Main {
17 private static Options getOptions() {
18 Option dir = OptionBuilder.withArgName( "dir" )
19 .hasArg()
20 .withDescription( "list files in given dir" )
21 .create( "dir" );
22 Options options = new Options();
23
24 options.addOption(dir);
25
26 return options;
27 }
28
29 public static void main(String [] args) throws Exception {
30 Options options = getOptions();
31 try {
32
33 CommandLineParser parser = new GnuParser();
34
35 CommandLine line = parser.parse( options, args );
36 File dir = new File (line.getOptionValue("dir", "."));
37 Collection files = ListFile.list(dir);
38 System.out.println("listing files in "+dir);
39 for (Iterator it = files.iterator(); it.hasNext(); ) {
40 System.out.println("\t"+it.next()+"\n");
41 }
42 } catch( ParseException exp ) {
43 System.err.println( "Parsing failed. Reason: " + exp.getMessage() );
45
46 HelpFormatter formatter = new HelpFormatter();
47 formatter.printHelp( "list", options );
48 }
49 }
50
51 }
52 |
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