Distribution.Simple

This is the command line front end to the Simple build system. When given the parsed command-line args and package information, is able to perform basic commands like configure, build, install, register, etc.

This module exports the main functions that Setup.hs scripts use. It re-exports the UserHooks type, the standard entry points like defaultMain and defaultMainWithHooks and the predefined sets of UserHooks that custom Setup.hs scripts can extend to add their own behaviour.

This module isn't called "Simple" because it's simple. Far from it. It's called "Simple" because it does complicated things to simple software.

The original idea was that there could be different build systems that all presented the same compatible command line interfaces. There is still a Distribution.Make system but in practice no packages use it.

Documentation

module Distribution.Package

module Distribution.Version

module Distribution.License

module Distribution.Simple.Compiler

module Language.Haskell.Extension

Simple interface

defaultMain :: IO ()

A simple implementation of main for a Cabal setup script. It reads the package description file using IO, and performs the action specified on the command line.

defaultMainNoRead :: GenericPackageDescription -> IO ()

Like defaultMain, but accepts the package description as input rather than using IO to read it.

defaultMainArgs :: [String] -> IO ()

A version of defaultMain that is passed the command line arguments, rather than getting them from the environment.

Customization

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]

defaultMainWithHooks :: UserHooks -> IO ()

A customizable version of defaultMain.

defaultMainWithHooksArgs :: UserHooks -> [String] -> IO ()

A customizable version of defaultMain that also takes the command line arguments.

defaultMainWithHooksNoRead :: UserHooks -> GenericPackageDescription -> IO ()

A customizable version of defaultMainNoRead.

defaultMainWithHooksNoReadArgs :: UserHooks -> GenericPackageDescription -> [String] -> IO ()

A customizable version of defaultMainNoRead that also takes the command line arguments.

Since: 2.2.0.0

Standard sets of hooks

simpleUserHooks :: UserHooks

Hooks that correspond to a plain instantiation of the "simple" build system

autoconfUserHooks :: UserHooks

Basic autoconf UserHooks:

• postConf runs ./configure, if present.
• the pre-hooks preBuild, preClean, preCopy, preInst, preReg and preUnreg read additional build information from package.buildinfo, if present.

Thus configure can use local system information to generate package.buildinfo and possibly other files.

emptyUserHooks :: UserHooks

Empty UserHooks which do nothing.