Distribution.Simple.UserHooks

This defines the API that Setup.hs scripts can use to customise the way the build works. This module just defines the UserHooks type. The predefined sets of hooks that implement the Simple, Make and Configure build systems are defined in Distribution.Simple. The UserHooks is a big record of functions. There are 3 for each action, a pre, post and the action itself. There are few other miscellaneous hooks, ones to extend the set of programs and preprocessors and one to override the function used to read the .cabal file.

This hooks type is widely agreed to not be the right solution. Partly this is because changes to it usually break custom Setup.hs files and yet many internal code changes do require changes to the hooks. For example we cannot pass any extra parameters to most of the functions that implement the various phases because it would involve changing the types of the corresponding hook. At some point it will have to be replaced.

Documentation

data UserHooks

Hooks allow authors to add specific functionality before and after a command is run, and also to specify additional preprocessors.

• WARNING: The hooks interface is under rather constant flux as we try to understand users needs. Setup files that depend on this interface may break in future releases.

Constructors

UserHooks

Fields

• readDesc :: IO (Maybe GenericPackageDescription)

  Read the description file

• hookedPreProcessors :: [PPSuffixHandler]

  Custom preprocessors in addition to and overriding knownSuffixHandlers.

• hookedPrograms :: [Program]

  These programs are detected at configure time. Arguments for them are added to the configure command.

• preConf :: Args -> ConfigFlags -> IO HookedBuildInfo

  Hook to run before configure command

• confHook :: (GenericPackageDescription, HookedBuildInfo) -> ConfigFlags -> IO LocalBuildInfo

  Over-ride this hook to get different behavior during configure.

• postConf :: Args -> ConfigFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after configure command

• preBuild :: Args -> BuildFlags -> IO HookedBuildInfo

  Hook to run before build command. Second arg indicates verbosity level.

• buildHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> BuildFlags -> IO ()

  Over-ride this hook to get different behavior during build.

• postBuild :: Args -> BuildFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after build command. Second arg indicates verbosity level.

• preRepl :: Args -> ReplFlags -> IO HookedBuildInfo

  Hook to run before repl command. Second arg indicates verbosity level.

• replHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> ReplFlags -> [String] -> IO ()

  Over-ride this hook to get different behavior during interpretation.

• postRepl :: Args -> ReplFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after repl command. Second arg indicates verbosity level.

• preClean :: Args -> CleanFlags -> IO HookedBuildInfo

  Hook to run before clean command. Second arg indicates verbosity level.

• cleanHook :: PackageDescription -> () -> UserHooks -> CleanFlags -> IO ()

  Over-ride this hook to get different behavior during clean.

• postClean :: Args -> CleanFlags -> PackageDescription -> () -> IO ()

  Hook to run after clean command. Second arg indicates verbosity level.

• preCopy :: Args -> CopyFlags -> IO HookedBuildInfo

  Hook to run before copy command

• copyHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> CopyFlags -> IO ()

  Over-ride this hook to get different behavior during copy.

• postCopy :: Args -> CopyFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after copy command

• preInst :: Args -> InstallFlags -> IO HookedBuildInfo

  Hook to run before install command

• instHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> InstallFlags -> IO ()

  Over-ride this hook to get different behavior during install.

• postInst :: Args -> InstallFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after install command. postInst should be run on the target, not on the build machine.

• preReg :: Args -> RegisterFlags -> IO HookedBuildInfo

  Hook to run before register command

• regHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> RegisterFlags -> IO ()

  Over-ride this hook to get different behavior during registration.

• postReg :: Args -> RegisterFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after register command

• preUnreg :: Args -> RegisterFlags -> IO HookedBuildInfo

  Hook to run before unregister command

• unregHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> RegisterFlags -> IO ()

  Over-ride this hook to get different behavior during unregistration.

• postUnreg :: Args -> RegisterFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after unregister command

• preHscolour :: Args -> HscolourFlags -> IO HookedBuildInfo

  Hook to run before hscolour command. Second arg indicates verbosity level.

• hscolourHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> HscolourFlags -> IO ()

  Over-ride this hook to get different behavior during hscolour.

• postHscolour :: Args -> HscolourFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after hscolour command. Second arg indicates verbosity level.

• preHaddock :: Args -> HaddockFlags -> IO HookedBuildInfo

  Hook to run before haddock command. Second arg indicates verbosity level.

• haddockHook :: PackageDescription -> LocalBuildInfo -> UserHooks -> HaddockFlags -> IO ()

  Over-ride this hook to get different behavior during haddock.

• postHaddock :: Args -> HaddockFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after haddock command. Second arg indicates verbosity level.

• preTest :: Args -> TestFlags -> IO HookedBuildInfo

  Hook to run before test command.

• testHook :: Args -> PackageDescription -> LocalBuildInfo -> UserHooks -> TestFlags -> IO ()

  Over-ride this hook to get different behavior during test.

• postTest :: Args -> TestFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after test command.

• preBench :: Args -> BenchmarkFlags -> IO HookedBuildInfo

  Hook to run before bench command.

• benchHook :: Args -> PackageDescription -> LocalBuildInfo -> UserHooks -> BenchmarkFlags -> IO ()

  Over-ride this hook to get different behavior during bench.

• postBench :: Args -> BenchmarkFlags -> PackageDescription -> LocalBuildInfo -> IO ()

  Hook to run after bench command.

type Args = [String]

emptyUserHooks :: UserHooks

Empty UserHooks which do nothing.