{-# OPTIONS -cpp #-}
-----------------------------------------------------------------------------
-- |
-- Module      :  Distribution.Simple.SrcDist
-- Copyright   :  Simon Marlow 2004
-- 
-- Maintainer  :  Isaac Jones <ijones@syntaxpolice.org>
-- Stability   :  alpha
-- Portability :  portable
--

{- Copyright (c) 2003-2004, Simon Marlow
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.

    * Neither the name of Isaac Jones nor the names of other
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -}

-- NOTE: FIX: we don't have a great way of testing this module, since
-- we can't easily look inside a tarball once its created.

module Distribution.Simple.SrcDist (
	sdist
#ifdef DEBUG        
        ,hunitTests
#endif
  )  where

import Distribution.PackageDescription
	(PackageDescription(..), BuildInfo(..), Executable(..), Library(..),
         setupMessage, libModules)
import Distribution.Package (showPackageId, PackageIdentifier(pkgVersion))
import Distribution.Version (Version(versionBranch))
import Distribution.Simple.Utils
        (smartCopySources, die, findPackageDesc, findFile, copyFileVerbose)
import Distribution.Setup (SDistFlags(..))
import Distribution.PreProcess (PPSuffixHandler, ppSuffixes, removePreprocessed)

import Control.Monad(when)
import Data.Char (isSpace, toLower)
import Data.List (isPrefixOf)
import System.Cmd (system)
import System.Time (getClockTime, toCalendarTime, CalendarTime(..))
import Distribution.Compat.Directory (doesFileExist, doesDirectoryExist,
         getCurrentDirectory, createDirectoryIfMissing, removeDirectoryRecursive)
import Distribution.Compat.FilePath (joinFileName, splitFileName)

#ifdef DEBUG
import HUnit (Test)
#endif

-- |Create a source distribution. FIX: Calls tar directly (won't work
-- on windows).
sdist :: PackageDescription
      -> SDistFlags -- verbose & snapshot
      -> FilePath -- ^build prefix (temp dir)
      -> FilePath -- ^TargetPrefix
      -> [PPSuffixHandler]  -- ^ extra preprocessors (includes suffixes)
      -> IO ()
sdist pkg_descr_orig (SDistFlags snapshot verbose) tmpDir targetPref pps = do
  time <- getClockTime
  ct <- toCalendarTime time
  let date = ctYear ct*10000 + (fromEnum (ctMonth ct) + 1)*100 + ctDay ct
  let pkg_descr
        | snapshot  = updatePackage (updatePkgVersion
                        (updateVersionBranch (++ [date]))) pkg_descr_orig
        | otherwise = pkg_descr_orig
  setupMessage "Building source dist for" pkg_descr
  ex <- doesDirectoryExist tmpDir
  when ex (die $ "Source distribution already in place. please move: " ++ tmpDir)
  let targetDir = tmpDir `joinFileName` (nameVersion pkg_descr)
  createDirectoryIfMissing True targetDir
  -- maybe move the library files into place
  maybe (return ()) (\l -> prepareDir verbose targetDir pps (libModules pkg_descr) (libBuildInfo l))
                    (library pkg_descr)
  -- move the executables into place
  flip mapM_ (executables pkg_descr) $ \ (Executable _ mainPath exeBi) -> do
    prepareDir verbose targetDir pps [] exeBi
    srcMainFile <- findFile (hsSourceDirs exeBi) mainPath
    copyFileTo verbose targetDir srcMainFile
  flip mapM_ (dataFiles pkg_descr) $ \ file -> do
    let (dir, _) = splitFileName file
    createDirectoryIfMissing True (targetDir `joinFileName` dir)
    copyFileVerbose verbose file (targetDir `joinFileName` file)
  when (not (null (licenseFile pkg_descr))) $
    copyFileTo verbose targetDir (licenseFile pkg_descr)
  flip mapM_ (extraSrcFiles pkg_descr) $ \ fpath -> do
    copyFileTo verbose targetDir fpath
  -- setup isn't listed in the description file.
  hsExists <- doesFileExist "Setup.hs"
  lhsExists <- doesFileExist "Setup.lhs"
  if hsExists then copyFileTo verbose targetDir "Setup.hs"
    else if lhsExists then copyFileTo verbose targetDir "Setup.lhs"
    else writeFile (targetDir `joinFileName` "Setup.hs") $ unlines [
                "import Distribution.Simple",
                "main = defaultMainWithHooks defaultUserHooks"]
  -- the description file itself
  descFile <- getCurrentDirectory >>= findPackageDesc
  let targetDescFile = targetDir `joinFileName` descFile
  -- We could just writePackageDescription targetDescFile pkg_descr,
  -- but that would lose comments and formatting.
  if snapshot then do
      contents <- readFile descFile
      writeFile targetDescFile $
          unlines $ map (appendVersion date) $ lines $ contents
    else copyFileVerbose verbose descFile targetDescFile

  let tarBallFilePath = targetPref `joinFileName` tarBallName pkg_descr
  system $ "(cd " ++ tmpDir
           ++ ";tar cf - " ++ (nameVersion pkg_descr) ++ ") | gzip -9 >"
           ++ tarBallFilePath
  removeDirectoryRecursive tmpDir
  putStrLn $ "Source tarball created: " ++ tarBallFilePath

  where
    updatePackage f pd = pd { package = f (package pd) }
    updatePkgVersion f pkg = pkg { pkgVersion = f (pkgVersion pkg) }
    updateVersionBranch f v = v { versionBranch = f (versionBranch v) }

    appendVersion :: Int -> String -> String
    appendVersion n line
      | "version:" `isPrefixOf` map toLower line =
            trimTrailingSpace line ++ "." ++ show n
      | otherwise = line

    trimTrailingSpace :: String -> String
    trimTrailingSpace = reverse . dropWhile isSpace . reverse

-- |Move the sources into place based on buildInfo
prepareDir :: Int       -- ^verbose
           -> FilePath  -- ^TargetPrefix
           -> [PPSuffixHandler]  -- ^ extra preprocessors (includes suffixes)
           -> [String]  -- ^Exposed modules
           -> BuildInfo
           -> IO ()
prepareDir verbose inPref pps mods BuildInfo{hsSourceDirs=srcDirs, otherModules=mods', cSources=cfiles}
    = do let suff = ppSuffixes pps  ++ ["hs", "lhs"]
         smartCopySources verbose srcDirs inPref (mods++mods') suff True True
         removePreprocessed (map (joinFileName inPref) srcDirs) mods suff
         mapM_ (copyFileTo verbose inPref) cfiles

copyFileTo :: Int -> FilePath -> FilePath -> IO ()
copyFileTo verbose dir file = do
  let targetFile = dir `joinFileName` file
  createDirectoryIfMissing True (fst (splitFileName targetFile))
  copyFileVerbose verbose file targetFile

------------------------------------------------------------

-- |The file name of the tarball
tarBallName :: PackageDescription -> FilePath
tarBallName p = (nameVersion p) ++ ".tar.gz"

nameVersion :: PackageDescription -> String
nameVersion = showPackageId . package

-- ------------------------------------------------------------
-- * Testing
-- ------------------------------------------------------------

#ifdef DEBUG
hunitTests :: [Test]
hunitTests = []
#endif