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POHow to get Apache CLI to handle double-dash?
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copied!<p>I've looked at the docs but can't see how to get the Apache Commons CLI to handle the double-hyphen "option" that normally terminates option processing.</p> <p>Consider the following command-line which has an "-opt" option which can take an optional argument that is not specified:</p> <pre><code>MyProgram -opt -- param1 param2 </code></pre> <p>I want the option to end up with no arguments in this case, but Apache returns "--" as an argument. If the option allowed for more than one argument, then some or all of the parameters would get returned as arguments.</p> <p>Here is sample code illustrating the issue:</p> <pre><code>package com.lifetouch.commons.cli; import java.util.Arrays; import org.apache.commons.cli.*; public class DoubleHyphen { private static Options options = new Options(); public static void main(String args[]) { // One required option with an optional argument: @SuppressWarnings("static-access") OptionBuilder builder = OptionBuilder.isRequired(true). withDescription("one optional arg"). withArgName("optArg").hasOptionalArgs(1); options.addOption(builder.create("opt")); // Illustrate the issue: doCliTest(new String[] { "-opt"} ); doCliTest(new String[] { "-opt", "optArg", "param"} ); doCliTest(new String[] { "-opt", "--", "param"} ); // What I want is for the double-dash to terminate option processing. // Note that if "opt" used hasOptionalArgs(2) then "param" would be a second // argument to that option (rather than an application parameter). } private static void doCliTest(String[] args) { System.out.println("\nTEST CASE -- command line items: " + Arrays.toString(args)); // Parse the command line: CommandLine cmdline = null; try { CommandLineParser parser = new GnuParser(); cmdline = parser.parse(options, args); // using stopAtNonOption does not help } catch (ParseException ex) { System.err.println("Command line parse error: " + ex); return; } // Observe the results for the option and argument: String optArgs[] = cmdline.getOptionValues("opt"); if (null == optArgs) { System.out.println("No args specified for opt"); } else { System.out.println(optArgs.length + " arg(s) for -opt option: " + Arrays.toString(optArgs)); } // Observe the results for the command-line parameters: String tmp = Arrays.toString(cmdline.getArgList().toArray()); System.out.println(cmdline.getArgList().size() + " command-line parameter(s): " + tmp); } } </code></pre>

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