{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
module Distribution.Types.MungedPackageId
  ( MungedPackageId(..)
  , computeCompatPackageId
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Parsec
import Distribution.Pretty
import Distribution.Types.LibraryName
import Distribution.Types.MungedPackageName
import Distribution.Types.PackageId
import Distribution.Version                 (Version, nullVersion)

import qualified Text.PrettyPrint as Disp

-- | A simple pair of a 'MungedPackageName' and 'Version'. 'MungedPackageName' is to
-- 'MungedPackageId' as 'PackageName' is to 'PackageId'. See 'MungedPackageName' for more
-- info.
data MungedPackageId
    = MungedPackageId {
        -- | The combined package and component name. see documentation for
        -- 'MungedPackageName'.
        MungedPackageId -> MungedPackageName
mungedName    :: MungedPackageName,
        -- | The version of this package / component, eg 1.2
        MungedPackageId -> Version
mungedVersion :: Version
     }
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instance Binary MungedPackageId

-- |
--
-- >>> prettyShow $ MungedPackageId (MungedPackageName "servant" LMainLibName) (mkVersion [1,2,3])
-- "servant-1.2.3"
--
-- >>> prettyShow $ MungedPackageId (MungedPackageName "servant" (LSubLibName "lackey")) (mkVersion [0,1,2])
-- "z-servant-z-lackey-0.1.2"
--
instance Pretty MungedPackageId where
    pretty :: MungedPackageId -> Doc
pretty (MungedPackageId MungedPackageName
n Version
v)
        | Version
v Version -> Version -> Bool
forall a. Eq a => a -> a -> Bool
== Version
nullVersion = MungedPackageName -> Doc
forall a. Pretty a => a -> Doc
pretty MungedPackageName
n -- if no version, don't show version.
        | Bool
otherwise        = MungedPackageName -> Doc
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pretty MungedPackageName
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-- |
--
-- >>> simpleParsec "foo-bar-0" :: Maybe MungedPackageId
-- Just (MungedPackageId {mungedName = MungedPackageName (PackageName "foo-bar") LMainLibName, mungedVersion = mkVersion [0]})
--
-- >>> simpleParsec "foo-bar" :: Maybe MungedPackageId
-- Just (MungedPackageId {mungedName = MungedPackageName (PackageName "foo-bar") LMainLibName, mungedVersion = mkVersion []})
--
-- >>> simpleParsec "z-foo-bar-z-baz-0" :: Maybe MungedPackageId
-- Just (MungedPackageId {mungedName = MungedPackageName (PackageName "foo-bar") (LSubLibName (UnqualComponentName "baz")), mungedVersion = mkVersion [0]})
--
-- >>> simpleParsec "foo-bar-0-0" :: Maybe MungedPackageId
-- Nothing
--
-- >>> simpleParsec "foo-bar.0" :: Maybe MungedPackageId
-- Nothing
--
-- >>> simpleParsec "foo-bar.4-2" :: Maybe MungedPackageId
-- Nothing
--
instance Parsec MungedPackageId where
    parsec :: m MungedPackageId
parsec = do
        PackageIdentifier PackageName
pn Version
v <- m PackageIdentifier
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return (MungedPackageId -> m MungedPackageId)
-> MungedPackageId -> m MungedPackageId
forall a b. (a -> b) -> a -> b
$ MungedPackageName -> Version -> MungedPackageId
MungedPackageId (PackageName -> MungedPackageName
decodeCompatPackageName PackageName
pn) Version
v

instance NFData MungedPackageId where
    rnf :: MungedPackageId -> ()
rnf (MungedPackageId MungedPackageName
name Version
version) = MungedPackageName -> ()
forall a. NFData a => a -> ()
rnf MungedPackageName
name () -> () -> ()
`seq` Version -> ()
forall a. NFData a => a -> ()
rnf Version
version

computeCompatPackageId :: PackageId -> LibraryName -> MungedPackageId
computeCompatPackageId :: PackageIdentifier -> LibraryName -> MungedPackageId
computeCompatPackageId (PackageIdentifier PackageName
pn Version
vr) LibraryName
ln =
    MungedPackageName -> Version -> MungedPackageId
MungedPackageId (PackageName -> LibraryName -> MungedPackageName
MungedPackageName PackageName
pn LibraryName
ln) Version
vr

-- $setup
-- >>> :seti -XOverloadedStrings
-- >>> import Distribution.Types.Version