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kotlinx.cli bug report

Reproducers are found here.

Unhandled NoSuchElement- / ArrayIndexOutOfBoundsException

When -- is encountered in GNU mode, next entries are considered options. However, there is no check that there exist any.

Consider the following test. Many results can be considered correct:

  • String "--" is interpreted as a delimiter between options and arguments, parsing is successful with no options and no arguments
  • String "--" is interpreted as an argument and parsing is successful
  • String "--" is interpreted as a start of the option and parser fails with a descriptive error because no options are registered

In practice though, it throws an ArrayOutOfBoundsException.

@Test
fun `gnu + '--'`() {
    val parser = ArgParser("").apply {
        argument(ArgType.String, fullName = "")
        prefixStyle = ArgParser.OptionPrefixStyle.GNU
    }

    val args = arrayOf("--")
    parser.parse(args)
}