org.argeo.core/src/org/argeo/cli/posix/Echo.java

   1 package org.argeo.cli.posix;
   2
   3 import java.util.List;
   4
   5 import org.apache.commons.cli.CommandLine;
   6 import org.apache.commons.cli.Option;
   7 import org.apache.commons.cli.Options;
   8 import org.argeo.cli.DescribedCommand;
   9
  10 public class Echo implements DescribedCommand<String> {
  11
  12         @Override
  13         public Options getOptions() {
  14                 Options options = new Options();
  15                 options.addOption(Option.builder("n").desc("do not output the trailing newline").build());
  16                 return options;
  17         }
  18
  19         @Override
  20         public String getDescription() {
  21                 return "Display a line of text";
  22         }
  23
  24         @Override
  25         public String getUsage() {
  26                 return "[STRING]...";
  27         }
  28
  29         @Override
  30         public String apply(List<String> args) {
  31                 CommandLine cl = toCommandLine(args);
  32
  33                 StringBuffer sb = new StringBuffer();
  34                 for (String s : cl.getArgList()) {
  35                         sb.append(s).append(' ');
  36                 }
  37
  38                 if (cl.hasOption('n')) {
  39                         sb.deleteCharAt(sb.length() - 1);
  40                 } else {
  41                         sb.setCharAt(sb.length() - 1, '\n');
  42                 }
  43                 return sb.toString();
  44         }
  45
  46 }