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Add hpack as a built-tool so it could be invoked to get a cabal file #40

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Add hpack as a built-tool so it could be invoked to get a cabal file #40

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11 changes: 10 additions & 1 deletion lib/Cabal2Nix.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@ import Data.Char (toUpper)
import System.FilePath
import Data.ByteString (ByteString)

import Distribution.Compat.Lens
import qualified Distribution.Types.BuildInfo.Lens as L
import Distribution.Types.CondTree
import Distribution.Types.Library
import Distribution.Types.ForeignLib
Expand Down Expand Up @@ -74,14 +76,21 @@ cabalFilePkgName = dropExtension . takeFileName . cabalFilePath
genExtra :: CabalFileGenerator -> NExpr
genExtra Hpack = mkNonRecSet [ "cabal-generator" $= mkStr "hpack" ]

amendGpdForGen :: CabalFileGenerator -> GenericPackageDescription -> GenericPackageDescription
amendGpdForGen Hpack gpd =
let hpackTool = ExeDependency "hpack" "hpack" anyVersion
in gpd & over L.traverseBuildInfos (& L.buildToolDepends %~ (hpackTool:))

cabal2nix :: Maybe Src -> CabalFile -> IO NExpr
cabal2nix src = \case
(OnDisk path) -> fmap (gpd2nix src Nothing)
$ readGenericPackageDescription normal path
(InMemory gen _ body) -> fmap (gpd2nix src (genExtra <$> gen))
$ case (runParseResult (parseGenericPackageDescription body)) of
(_, Left (_, err)) -> (error ("Failed to parse in-memory cabal file: " ++ show err))
(_, Right desc) -> pure desc
(_, Right desc) -> case gen of
Just g -> pure $ amendGpdForGen g desc
Nothing -> pure desc

gpd2nix :: Maybe Src -> Maybe NExpr -> GenericPackageDescription -> NExpr
gpd2nix src extra gpd = mkFunction args $ toNix gpd $//? (toNix <$> src) $//? extra
Expand Down