paul j3 added the comment:
Regarding a usage line like:
(-o FILE | (-O DIR & (-p PATTERN | -s SUFFIX))
The simplest option is to just a custom written 'usage' parameter.
With the existing HelpFormatter, a nested grouping like this is next to
impossible. It formats the arguments (e.g.'-O DIR'), interleaves the group
symbols, and then trims out the excess spaces and symbols.
http://bugs.python.org/issue10984 is a request to allow overlapping
mutually_exclusive_groups. It loops on the groups, formatting each. It would
be easier with that to format several different types of groups, and to handle
nested ones.
What would it take to convert a usage string like that into a logical
expression that tests for the proper occurrence (or non-occurrence) of the
various arguments. It might, for example be converted to
exc(file, inc(dir, exc(pattern, suffix)))
where 'exc' and 'inc' are exclusive and inclusive tests, and 'file','dir' etc
are booleans. And what would be the error message(s) if this expression fails?
I can imagine a factory function that would take usage line (or other
expression of groupings), and produce a function that would implement a
cross_test (as outlined in my previous post). It would be, in effect, a
micro-language compiler.
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<http://bugs.python.org/issue11588>
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