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I'm trying to use the function extract defined in Development.Shake.FilePattern but it's hidden. Why? It's not used internally either from what I can gather.

$ ghci
GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> import Development.Shake.FilePattern

<no location info>: 
    Could not find module `Development.Shake.FilePattern'
    it is a hidden module in the package `shake-0.15.10'
Prelude>

extract would be really handy. Currently I have to resort to custom string manipulations instead.

nesqi
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1 Answers1

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extract is used internally to implement the user-visible &%> function.

Shake deliberately tries to avoid leaking internal implementation details - for example it contains a thread-pool implementation, which it keeps quiet. That said, clearly FilePattern are useful, so:

  • Since Shake v0.16 there is a function filePattern, which does what is requested above.
  • The FilePattern functionality in Shake has been released as the filepattern library, which Shake will use for all its functionality.
Neil Mitchell
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