[Haskell-cafe] extension to filter with external program (was: Current status of Mavericks CPP)

Tobias Florek haskell at ibotty.net
Wed Apr 16 11:29:23 UTC 2014


i may certainly be missing something, as i only used cpp in haskell for 
conditional compilation. having said that:

i'd like to have (instead of LANGUAGE CPP) the following extension.

LANGUAGE FilterWithExternalProgram my_cpp

that would make it possible to use a cpp implementation implemented 
separately from ghc and would leave it to the ecosystem to implement 
best practices (i.e. a haskell implementation of cpp or the proposed 
declarative extension).

i _guess_ that should also make it easier to use compile-to-haskell 
programs like she. maybe a hypothetical template haskell alternative 
might also work with it.

  tobias florek

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