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-----------------------------------------------------------------------------
-- |
-- Module : Distribution.Make
-- Copyright : Martin Sjögren 2004
-- License : BSD3
--
-- Maintainer : cabal-devel@haskell.org
-- Portability : portable
--
-- This is an alternative build system that delegates everything to the @make@
-- program. All the commands just end up calling @make@ with appropriate
-- arguments. The intention was to allow preexisting packages that used
-- makefiles to be wrapped into Cabal packages. In practice essentially all
-- such packages were converted over to the \"Simple\" build system instead.
-- Consequently this module is not used much and it certainly only sees cursory
-- maintenance and no testing. Perhaps at some point we should stop pretending
-- that it works.
--
-- Uses the parsed command-line from "Distribution.Simple.Setup" in order to build
-- Haskell tools using a back-end build system based on make. Obviously we
-- assume that there is a configure script, and that after the ConfigCmd has
-- been run, there is a Makefile. Further assumptions:
--
-- [ConfigCmd] We assume the configure script accepts
-- @--with-hc@,
-- @--with-hc-pkg@,
-- @--prefix@,
-- @--bindir@,
-- @--libdir@,
-- @--libexecdir@,
-- @--datadir@.
--
-- [BuildCmd] We assume that the default Makefile target will build everything.
--
-- [InstallCmd] We assume there is an @install@ target. Note that we assume that
-- this does *not* register the package!
--
-- [CopyCmd] We assume there is a @copy@ target, and a variable @$(destdir)@.
-- The @copy@ target should probably just invoke @make install@
-- recursively (e.g. @$(MAKE) install prefix=$(destdir)\/$(prefix)
-- bindir=$(destdir)\/$(bindir)@. The reason we can\'t invoke @make
-- install@ directly here is that we don\'t know the value of @$(prefix)@.
--
-- [SDistCmd] We assume there is a @dist@ target.
--
-- [RegisterCmd] We assume there is a @register@ target and a variable @$(user)@.
--
-- [UnregisterCmd] We assume there is an @unregister@ target.
--
-- [HaddockCmd] We assume there is a @docs@ or @doc@ target.


-- copy :
-- $(MAKE) install prefix=$(destdir)/$(prefix) \
-- bindir=$(destdir)/$(bindir) \

module Distribution.Make (
        module Distribution.Package,
        License(..), Version(..),
        defaultMain, defaultMainArgs, defaultMainNoRead
  ) where

-- local
import Distribution.Compat.Exception
import Distribution.Package --must not specify imports, since we're exporting moule.
import Distribution.Simple.Program(defaultProgramConfiguration)
import Distribution.PackageDescription
import Distribution.Simple.Setup
import Distribution.Simple.Command

import Distribution.Simple.Utils (rawSystemExit, cabalVersion)

import Distribution.License (License(..))
import Distribution.Version
         ( Version(..) )
import Distribution.Text
         ( display )

import System.Environment (getArgs, getProgName)
import Data.List (intercalate)
import System.Exit

defaultMain :: IO ()
defaultMain = getArgs >>= defaultMainArgs

defaultMainArgs :: [String] -> IO ()
defaultMainArgs = defaultMainHelper

{-# DEPRECATED defaultMainNoRead "it ignores its PackageDescription arg" #-}
defaultMainNoRead :: PackageDescription -> IO ()
defaultMainNoRead = const defaultMain

defaultMainHelper :: [String] -> IO ()
defaultMainHelper args =
  case commandsRun globalCommand commands args of
    CommandHelp help -> printHelp help
    CommandList opts -> printOptionsList opts
    CommandErrors errs -> printErrors errs
    CommandReadyToGo (flags, commandParse) ->
      case commandParse of
        _ | fromFlag (globalVersion flags) -> printVersion
          | fromFlag (globalNumericVersion flags) -> printNumericVersion
        CommandHelp help -> printHelp help
        CommandList opts -> printOptionsList opts
        CommandErrors errs -> printErrors errs
        CommandReadyToGo action -> action

  where
    printHelp help = getProgName >>= putStr . help
    printOptionsList = putStr . unlines
    printErrors errs = do
      putStr (intercalate "\n" errs)
      exitWith (ExitFailure 1)
    printNumericVersion = putStrLn $ display cabalVersion
    printVersion = putStrLn $ "Cabal library version "
                                  ++ display cabalVersion

    progs = defaultProgramConfiguration
    commands =
      [configureCommand progs `commandAddAction` configureAction
      ,buildCommand progs `commandAddAction` buildAction
      ,installCommand `commandAddAction` installAction
      ,copyCommand `commandAddAction` copyAction
      ,haddockCommand `commandAddAction` haddockAction
      ,cleanCommand `commandAddAction` cleanAction
      ,sdistCommand `commandAddAction` sdistAction
      ,registerCommand `commandAddAction` registerAction
      ,unregisterCommand `commandAddAction` unregisterAction
      ]

configureAction :: ConfigFlags -> [String] -> IO ()
configureAction flags args = do
  noExtraFlags args
  let verbosity = fromFlag (configVerbosity flags)
  rawSystemExit verbosity "sh" $
    "configure"
    : configureArgs backwardsCompatHack flags
  where backwardsCompatHack = True

copyAction :: CopyFlags -> [String] -> IO ()
copyAction flags args = do
  noExtraFlags args
  let destArgs = case fromFlag $ copyDest flags of
        NoCopyDest -> ["install"]
        CopyTo path -> ["copy", "destdir=" ++ path]
  rawSystemExit (fromFlag $ copyVerbosity flags) "make" destArgs

installAction :: InstallFlags -> [String] -> IO ()
installAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ installVerbosity flags) "make" ["install"]
  rawSystemExit (fromFlag $ installVerbosity flags) "make" ["register"]

haddockAction :: HaddockFlags -> [String] -> IO ()
haddockAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ haddockVerbosity flags) "make" ["docs"]
    `catchIO` \_ ->
    rawSystemExit (fromFlag $ haddockVerbosity flags) "make" ["doc"]

buildAction :: BuildFlags -> [String] -> IO ()
buildAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ buildVerbosity flags) "make" []

cleanAction :: CleanFlags -> [String] -> IO ()
cleanAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ cleanVerbosity flags) "make" ["clean"]

sdistAction :: SDistFlags -> [String] -> IO ()
sdistAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ sDistVerbosity flags) "make" ["dist"]

registerAction :: RegisterFlags -> [String] -> IO ()
registerAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ regVerbosity flags) "make" ["register"]

unregisterAction :: RegisterFlags -> [String] -> IO ()
unregisterAction flags args = do
  noExtraFlags args
  rawSystemExit (fromFlag $ regVerbosity flags) "make" ["unregister"]
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