Roland Roberts wrote:
> Michael Heuer wrote:
> > Hello,
> >
> > My use case is -h,--help text prints to STDOUT and command line errors
> > print to STDERR.
> [...]
> > But if there is a missing required option, the help part is unreachable,
> > since a MissingOptionException is thrown
> >
> Yes, it does and in that case you need to handle the exception and call
> the helpformatter yourself. Here's an (incomplete) extract from some of
> my working code:
>
> CommandLineParser parser = new GnuParser();
> MyOptions opt = new MyOptions();
> try {
> // parse the command line arguments
> CommandLine line = parser.parse(options, args);
>
> // validate that block-size has been set
> if (line.hasOption("h")) {
> HelpFormatter formatter = new HelpFormatter();
> formatter.printHelp("java " +
> ProcessIEC.class.getName(), options);
> return null;
> }
>
> [...]
>
> } catch (org.apache.commons.cli.ParseException exp) {
> System.out.println(exp.getMessage());
> HelpFormatter formatter = new HelpFormatter();
> formatter.printHelp(ProcessIEC.class.getName(), options, true);
> throw(exp);
> }
>
Thanks for the reply Roland, but you may have missed the point of my use
case. Once I catch the exception there is no way to determine whether or
not the help option was specified.
michael
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