mirror of
https://github.com/simplex-chat/haskell.nix.git
synced 2026-06-03 09:17:32 +00:00
Hamish Mackenzie
f3ea06dcac
For ghc 9.0.2 Haskell.nix will use the `stm`and `filepath` source that came with `ghc` when the version desired matches. This is because 9.0.2 shipped with packages that differ from the same version in hackage. `reinstallableLibGhc` is fixed for GHC 8.10 and above. Rather than including a patch file this works by: * Setting the `subDir` to the `compiler` directory when building. That way relative paths to other parts of the `ghc` source tree (outside the `compiler` directory) still work. * Files that are needed, but generated when `ghc` builds are added from the `generated` output of the ghc derivation. `nonReinstallablePkgs` is now sorted and deduplicated before it is used (this reduces the chance of rebuilds when the list is refactored).
33 lines
862 B
Haskell
33 lines
862 B
Haskell
{-# LANGUAGE CPP #-}
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import Distribution.Simple
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-- https://github.com/snoyberg/conduit#readme
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import Conduit
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import System.Directory (removeFile)
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-- Make sure Cabal and ghc were included
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import Distribution.Package ()
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#if MIN_VERSION_ghc(9,0,0)
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import GHC.SysTools.Ar ()
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#else
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import Ar ()
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#endif
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example = do
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-- Pure operations: summing numbers.
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print $ runConduitPure $ yieldMany [1..10] .| sumC
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-- Exception safe file access: copy a file.
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writeFile "input.txt" "This is a test." -- create the source file
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runConduitRes $ sourceFileBS "input.txt" .| sinkFile "output.txt" -- actual copying
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readFile "output.txt" >>= putStrLn -- prove that it worked
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-- Perform transformations.
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print $ runConduitPure $ yieldMany [1..10] .| mapC (+ 1) .| sinkList
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removeFile "input.txt"
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removeFile "output.txt"
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main = defaultMain
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