how to get "leftover arguments" in optparse-applicative?

Question

I am trying to use optparse-applicative. How can I access arguments that are not options? (From prog --foo --bar=42 baz, I want to get ["baz"])

All the the "high level" functions https://hackage.haskell.org/package/optparse-applicative-0.11.0.2/docs/Options-Applicative-Extra.html return a where I want (a,[String]).

There is some low-level function https://hackage.haskell.org/package/optparse-applicative-0.11.0.2/docs/Options-Applicative-Common.html#v:runParser but I cannot call it directly because of its type. And indeed I do want to re-use all the plumbing that is in https://hackage.haskell.org/package/optparse-applicative-0.11.0.2/docs/src/Options-Applicative-Extra.html#execParser .

score 5 · Accepted Answer · answered Mar 08 '15 at 14:58

5

Positional arguments are part of the parser specification. They are not returned separately by the function that runs the parser. The functions argument and strArgument can be used to add a parser for a positional argument to the specification.

answered Mar 08 '15 at 14:58

kosmikus

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What if you need a variable amount of arguments grouped together (as in a number of unix commands that take a list of file names at the end)? – Kathy Van Stone Jan 25 '19 at 18:59
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Parsers are an instance of `Applicative`, so you can use functions like `many` or `some` to allow a variable number of arguments. – kosmikus Jan 25 '19 at 19:42
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Thanks! Those were the functions I was missing. – Kathy Van Stone Jan 29 '19 at 18:22

how to get "leftover arguments" in optparse-applicative?

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