Hello,
My use case is -h,--help text prints to STDOUT and command line errors
print to STDERR.
This works fine in the simple case
Options options = new Options();
HelpFormatter helpFormatter = new HelpFormatter();
Option help = new Option("h", "help", false, "print help text to STDOUT");
help.setRequired(false);
options.addOption(help);
try
{
CommandLineParser parser = new PosixParser();
CommandLine commandLine = parser.parse(options, args);
if (commandLine.hasOption(help.getOpt()))
{
helpFormatter.printHelp(...
}
...
}
catch (ParseException e)
{
System.err.println(e.getMessage() + "\n");
helpFormatter.printHelp(new PrintWriter(System.err, true), ...
}
But if there is a missing required option, the help part is unreachable,
since a MissingOptionException is thrown
Options options = new Options();
HelpFormatter helpFormatter = new HelpFormatter();
Option help = new Option("h", "help", false, "print help text to STDOUT");
help.setRequired(false);
Option foo = new Option(...);
foo.setRequired(true);
options.addOption(help);
options.addOption(foo);
try
{
CommandLineParser parser = new PosixParser();
CommandLine commandLine = parser.parse(options, args);
if (commandLine.hasOption(help.getOpt()))
{
helpFormatter.printHelp(...
}
...
}
catch (ParseException e)
{
System.err.println(e.getMessage() + "\n");
helpFormatter.printHelp(new PrintWriter(System.err, true), ...
}
I could move the help part to the catch block, but there is no way to
query whether the help option was found.
catch (ParseException e)
{
if ( help was found )
{
helpFormatter.printHelp(...
}
else
{
System.err.println(e.getMessage() + "\n");
helpFormatter.printHelp(new PrintWriter(System.err, true), ...
}
}
michael
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