picocli does not seem to support - as a positional parameter

Hi,

I’m preparing some demo project for picocli and stumbled over some interesting, currently unsupported case.

Some shell commands, like cat accept - as a positional parameter

cat -

which means cat will read it’s input from STDIN instead of a file.

But it seems picocli currently doesn’t support such a case?

When I call

@Command(name = "mst-cli", mixinStandardHelpOptions = true)
public class Cli implements Runnable {
    @Parameters(index = "0")
    private String json;
    @Parameters(index = "1")
    private String template;
    // more code
}

with the following parameters

- ~/hello.mustache

picocli complains that the second parameter isn’t set 😕.

But

~/data.json ~/hello.mustache

works.

[helpermethod]

Thank you very much. Was very low on time the last few weeks so couldn’t test the change 😕.

[remkop]

Fixed in master. Improved the heuristics for unmatched options: single-character arguments that don’t exactly match options (like -) are now always considered positional parameters.

Please verify.