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1. readPackageEnvironmentFile :: ConstraintSource -> PackageEnvironment -> FilePath -> IO (Maybe (ParseResult PackageEnvironment))

   cabal-install	Distribution.Client.Sandbox.PackageEnvironment

   Read the package environment file.

2. readCommandFlags :: FilePath -> CommandUI flags -> IO flags

   cabal-install	Distribution.Client.SavedFlags

   Read command-line arguments, separated by null characters, from a file. Returns the default flags if the file does not exist.

3. readSavedArgs :: FilePath -> IO (Maybe [String])

   cabal-install	Distribution.Client.SavedFlags

   No documentation available.

4. readTargetSelectors :: [PackageSpecifier (SourcePackage (PackageLocation a))] -> Maybe ComponentKindFilter -> [String] -> IO (Either [TargetSelectorProblem] [TargetSelector])

   cabal-install	Distribution.Client.TargetSelector

   Parse a bunch of command line args as TargetSelectors, failing with an error if any are unrecognised. The possible target selectors are based on the available packages (and their locations).

5. readTargetSelectorsWith :: (Applicative m, Monad m) => DirActions m -> [PackageSpecifier (SourcePackage (PackageLocation a))] -> Maybe ComponentKindFilter -> [String] -> m (Either [TargetSelectorProblem] [TargetSelector])

   cabal-install	Distribution.Client.TargetSelector

   No documentation available.

6. readPackageTarget :: Verbosity -> PackageTarget ResolvedPkgLoc -> IO (PackageTarget UnresolvedSourcePackage)

   cabal-install	Distribution.Client.Targets

   Given a package target that has been fetched, read the .cabal file. This only affects targets given by location, named targets are unaffected.

7. readUserConstraint :: String -> Either String UserConstraint

   cabal-install	Distribution.Client.Targets

   No documentation available.

8. readUserTarget :: String -> IO (Either UserTargetProblem UserTarget)

   cabal-install	Distribution.Client.Targets

   No documentation available.

9. readUserTargets :: Verbosity -> [String] -> IO [UserTarget]

   cabal-install	Distribution.Client.Targets

   No documentation available.

10. readMaybe :: Read a => String -> Maybe a

    cabal-install	Distribution.Client.Utils

    Parse a string using the Read instance. Succeeds if there is exactly one valid result.

    >>> readMaybe "123" :: Maybe Int
    Just 123
    

    >>> readMaybe "hello" :: Maybe Int
    Nothing
    

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