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https://issues.apache.org/jira/browse/CLI-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615936#action_12615936
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Andrew Shirley commented on CLI-124:
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The original report was concerning the output of the HelpFormatter (which
shouldn't suggest B is optional if it isn't). There is a seperate question of
whether the constraints we can apply to options are sufficient.
By drawing analogy to XML schema, a minOccurs of 1 on A would mean that /for
each/ B, there must be at least one A. a document would still be valid if it
contained no Bs (assuming no other rules on B).
It seems that Options aren't stored in a properly heirarchical way and that
setting a minimum on A applies globally (i.e. A must be specified on the
command line that many times (regardless of how many times B is present). I
think it would be a major overhaul to support heirarchical semantics however it
might be possible to do something.
Unfortunatly, I havn't worked on CLI for a long time (and havn't even been
keeping up with the mailing lists recently) and so I don't have any suggestions
as to what could be usefully done (or how to do it).
If someone thinks this would be a useful addition, can I suggest opening a new
enhancement bug for this issue (could I be added to the CC if this happens
please.)
> HelpFormatter should be more cunning when deciding if a Group is Optional and
> therefore square-bracketing it
> ------------------------------------------------------------------------------------------------------------
>
> Key: CLI-124
> URL: https://issues.apache.org/jira/browse/CLI-124
> Project: Commons CLI
> Issue Type: Improvement
> Components: CLI-2.x
> Reporter: Andrew Shirley
> Fix For: 2.0
>
>
> Currently all child groups are required to satisfy their constraints (defaul
> is any thing goes) and so if you have a Group A as a child of Group B and set
> a minimum of 1 on A then B is no longer Optional as A is not Optional.
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