content: -----------------------------------------------------------------------------
  -- |
  -- Module      :  Distribution.Simple.SrcDist
  -- Copyright   :  Simon Marlow 2004
  --
  -- Maintainer  :  cabal-devel@haskell.org
  -- Portability :  portable
  --
  -- This handles the @sdist@ command. The module exports an 'sdist' action but
  -- also some of the phases that make it up so that other tools can use just the
  -- bits they need. In particular the preparation of the tree of files to go
  -- into the source tarball is separated from actually building the source
  -- tarball.
  --
  -- The 'createArchive' action uses the external @tar@ program and assumes that
  -- it accepts the @-z@ flag. Neither of these assumptions are valid on Windows.
  -- The 'sdist' action now also does some distribution QA checks.
  
  {- 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 (
    -- * The top level action
    sdist,
  
    -- ** Parts of 'sdist'
    printPackageProblems,
    prepareTree,
    createArchive,
  
    -- ** Snaphots
    prepareSnapshotTree,
    snapshotPackage,
    snapshotVersion,
    dateToSnapshotNumber,
  
    -- * Extracting the source files
    listPackageSources
  
    )  where
  
  import Distribution.PackageDescription
           ( PackageDescription(..), BuildInfo(..), Executable(..), Library(..)
           , TestSuite(..), TestSuiteInterface(..), Benchmark(..)
           , BenchmarkInterface(..) )
  import Distribution.PackageDescription.Check
           ( PackageCheck(..), checkConfiguredPackage, checkPackageFiles )
  import Distribution.Package
           ( PackageIdentifier(pkgVersion), Package(..), packageVersion )
  import Distribution.ModuleName (ModuleName)
  import qualified Distribution.ModuleName as ModuleName
  import Distribution.Version
           ( Version(versionBranch) )
  import Distribution.Simple.Utils
           ( createDirectoryIfMissingVerbose, withUTF8FileContents, writeUTF8File
           , installOrdinaryFiles, installMaybeExecutableFiles
           , findFile, findFileWithExtension, matchFileGlob
           , withTempDirectory, defaultPackageDesc
           , die, warn, notice, setupMessage )
  import Distribution.Simple.Setup ( Flag(..), SDistFlags(..)
                                   , fromFlag, flagToMaybe)
  import Distribution.Simple.PreProcess ( PPSuffixHandler, ppSuffixes
                                        , preprocessComponent )
  import Distribution.Simple.LocalBuildInfo
           ( LocalBuildInfo(..), withAllComponentsInBuildOrder )
  import Distribution.Simple.BuildPaths ( autogenModuleName )
  import Distribution.Simple.Program ( defaultProgramConfiguration, requireProgram,
                                rawSystemProgram, tarProgram )
  import Distribution.Text
           ( display )
  
  import Control.Monad(when, unless, forM)
  import Data.Char (toLower)
  import Data.List (partition, isPrefixOf)
  import Data.Maybe (isNothing, catMaybes)
  import Data.Time (UTCTime, getCurrentTime, toGregorian, utctDay)
  import System.Directory ( doesFileExist )
  import System.IO (IOMode(WriteMode), hPutStrLn, withFile)
  import Distribution.Verbosity (Verbosity)
  import System.FilePath
           ( (</>), (<.>), dropExtension, isAbsolute )
  
  -- |Create a source distribution.
  sdist :: PackageDescription     -- ^information from the tarball
        -> Maybe LocalBuildInfo   -- ^Information from configure
        -> SDistFlags             -- ^verbosity & snapshot
        -> (FilePath -> FilePath) -- ^build prefix (temp dir)
        -> [PPSuffixHandler]      -- ^ extra preprocessors (includes suffixes)
        -> IO ()
  sdist pkg mb_lbi flags mkTmpDir pps =
  
    -- When given --list-sources, just output the list of sources to a file.
    case (sDistListSources flags) of
      Flag path -> withFile path WriteMode $ \outHandle -> do
        (ordinary, maybeExecutable) <- listPackageSources verbosity pkg pps
        mapM_ (hPutStrLn outHandle) ordinary
        mapM_ (hPutStrLn outHandle) maybeExecutable
        notice verbosity $ "List of package sources written to file '"
                           ++ path ++ "'"
      NoFlag    -> do
        -- do some QA
        printPackageProblems verbosity pkg
  
        when (isNothing mb_lbi) $
          warn verbosity "Cannot run preprocessors. Run 'configure' command first."
  
        date <- getCurrentTime
        let pkg' | snapshot  = snapshotPackage date pkg
                 | otherwise = pkg
  
        case flagToMaybe (sDistDirectory flags) of
          Just targetDir -> do
            generateSourceDir targetDir pkg'
            notice verbosity $ "Source directory created: " ++ targetDir
  
          Nothing -> do
            createDirectoryIfMissingVerbose verbosity True tmpTargetDir
            withTempDirectory verbosity tmpTargetDir "sdist." $ \tmpDir -> do
              let targetDir = tmpDir </> tarBallName pkg'
              generateSourceDir targetDir pkg'
              targzFile <- createArchive verbosity pkg' mb_lbi tmpDir targetPref
              notice verbosity $ "Source tarball created: " ++ targzFile
  
    where
      generateSourceDir targetDir pkg' = do
  
        setupMessage verbosity "Building source dist for" (packageId pkg')
        prepareTree verbosity pkg' mb_lbi targetDir pps
        when snapshot $
          overwriteSnapshotPackageDesc verbosity pkg' targetDir
  
      verbosity = fromFlag (sDistVerbosity flags)
      snapshot  = fromFlag (sDistSnapshot flags)
  
      distPref     = fromFlag $ sDistDistPref flags
      targetPref   = distPref
      tmpTargetDir = mkTmpDir distPref
  
  -- | List all source files of a package. Returns a tuple of lists: first
  -- component is a list of ordinary files, second one is a list of those files
  -- that may be executable.
  listPackageSources :: Verbosity          -- ^ verbosity
                     -> PackageDescription -- ^ info from the cabal file
                     -> [PPSuffixHandler]  -- ^ extra preprocessors (include
                                           -- suffixes)
                     -> IO ([FilePath], [FilePath])
  listPackageSources verbosity pkg_descr0 pps = do
    -- Call helpers that actually do all work.
    ordinary        <- listPackageSourcesOrdinary        verbosity pkg_descr pps
    maybeExecutable <- listPackageSourcesMaybeExecutable pkg_descr
    return (ordinary, maybeExecutable)
    where
      pkg_descr = filterAutogenModule pkg_descr0
  
  -- | List those source files that may be executable (e.g. the configure script).
  listPackageSourcesMaybeExecutable :: PackageDescription -> IO [FilePath]
  listPackageSourcesMaybeExecutable pkg_descr =
    -- Extra source files.
    fmap concat . forM (extraSrcFiles pkg_descr) $ \fpath -> matchFileGlob fpath
  
  -- | List those source files that should be copied with ordinary permissions.
  listPackageSourcesOrdinary :: Verbosity
                             -> PackageDescription
                             -> [PPSuffixHandler]
                             -> IO [FilePath]
  listPackageSourcesOrdinary verbosity pkg_descr pps =
    fmap concat . sequence $
    [
      -- Library sources.
      withLib $ \Library { exposedModules = modules, libBuildInfo = libBi } ->
       allSourcesBuildInfo libBi pps modules
  
      -- Executables sources.
    , fmap concat
      . withExe $ \Executable { modulePath = mainPath, buildInfo = exeBi } -> do
         biSrcs  <- allSourcesBuildInfo exeBi pps []
         mainSrc <- findMainExeFile exeBi pps mainPath
         return (mainSrc:biSrcs)
  
      -- Test suites sources.
    , fmap concat
      . withTest $ \t -> do
         let bi  = testBuildInfo t
         case testInterface t of
           TestSuiteExeV10 _ mainPath -> do
             biSrcs <- allSourcesBuildInfo bi pps []
             srcMainFile <- do
               ppFile <- findFileWithExtension (ppSuffixes pps)
                         (hsSourceDirs bi) (dropExtension mainPath)
               case ppFile of
                 Nothing -> findFile (hsSourceDirs bi) mainPath
                 Just pp -> return pp
             return (srcMainFile:biSrcs)
           TestSuiteLibV09 _ m ->
             allSourcesBuildInfo bi pps [m]
           TestSuiteUnsupported tp -> die $ "Unsupported test suite type: "
                                     ++ show tp
  
      -- Benchmarks sources.
    , fmap concat
      . withBenchmark $ \bm -> do
         let  bi = benchmarkBuildInfo bm
         case benchmarkInterface bm of
           BenchmarkExeV10 _ mainPath -> do
             biSrcs <- allSourcesBuildInfo bi pps []
             srcMainFile <- do
               ppFile <- findFileWithExtension (ppSuffixes pps)
                         (hsSourceDirs bi) (dropExtension mainPath)
               case ppFile of
                 Nothing -> findFile (hsSourceDirs bi) mainPath
                 Just pp -> return pp
             return (srcMainFile:biSrcs)
           BenchmarkUnsupported tp -> die $ "Unsupported benchmark type: "
                                      ++ show tp
  
      -- Data files.
    , fmap concat
      . forM (dataFiles pkg_descr) $ \filename ->
         matchFileGlob (dataDir pkg_descr </> filename)
  
      -- Extra doc files.
    , fmap concat
      . forM (extraDocFiles pkg_descr) $ \ filename ->
        matchFileGlob filename
  
      -- License file.
    , return $ case [licenseFile pkg_descr]
               of [[]] -> []
                  l    -> l
  
      -- Install-include files.
    , withLib $ \ l -> do
         let lbi = libBuildInfo l
             relincdirs = "." : filter (not.isAbsolute) (includeDirs lbi)
         mapM (fmap snd . findIncludeFile relincdirs) (installIncludes lbi)
  
      -- Setup script, if it exists.
    , fmap (maybe [] (\f -> [f])) $ findSetupFile ""
  
      -- The .cabal file itself.
    , fmap (\d -> [d]) (defaultPackageDesc verbosity)
  
    ]
    where
      -- We have to deal with all libs and executables, so we have local
      -- versions of these functions that ignore the 'buildable' attribute:
      withLib       action = maybe (return []) action (library pkg_descr)
      withExe       action = mapM action (executables pkg_descr)
      withTest      action = mapM action (testSuites pkg_descr)
      withBenchmark action = mapM action (benchmarks pkg_descr)
  
  
  -- |Prepare a directory tree of source files.
  prepareTree :: Verbosity          -- ^verbosity
              -> PackageDescription -- ^info from the cabal file
              -> Maybe LocalBuildInfo
              -> FilePath           -- ^source tree to populate
              -> [PPSuffixHandler]  -- ^extra preprocessors (includes suffixes)
              -> IO ()
  prepareTree verbosity pkg_descr0 mb_lbi targetDir pps = do
    -- If the package was configured then we can run platform independent
    -- pre-processors and include those generated files.
    case mb_lbi of
      Just lbi | not (null pps) -> do
        let lbi' = lbi{ buildDir = targetDir </> buildDir lbi }
        withAllComponentsInBuildOrder pkg_descr lbi' $ \c _ ->
          preprocessComponent pkg_descr c lbi' True verbosity pps
      _ -> return ()
  
    (ordinary, mExecutable)  <- listPackageSources verbosity pkg_descr0 pps
    installOrdinaryFiles        verbosity targetDir (zip (repeat []) ordinary)
    installMaybeExecutableFiles verbosity targetDir (zip (repeat []) mExecutable)
    maybeCreateDefaultSetupScript targetDir
  
    where
      pkg_descr = filterAutogenModule pkg_descr0
  
  -- | Find the setup script file, if it exists.
  findSetupFile :: FilePath -> IO (Maybe FilePath)
  findSetupFile targetDir = do
    hsExists  <- doesFileExist setupHs
    lhsExists <- doesFileExist setupLhs
    if hsExists
      then return (Just setupHs)
      else if lhsExists
           then return (Just setupLhs)
           else return Nothing
      where
        setupHs  = targetDir </> "Setup.hs"
        setupLhs = targetDir </> "Setup.lhs"
  
  -- | Create a default setup script in the target directory, if it doesn't exist.
  maybeCreateDefaultSetupScript :: FilePath -> IO ()
  maybeCreateDefaultSetupScript targetDir = do
    mSetupFile <- findSetupFile targetDir
    case mSetupFile of
      Just _setupFile -> return ()
      Nothing         -> do
        writeUTF8File (targetDir </> "Setup.hs") $ unlines [
          "import Distribution.Simple",
          "main = defaultMain"]
  
  -- | Find the main executable file.
  findMainExeFile :: BuildInfo -> [PPSuffixHandler] -> FilePath -> IO FilePath
  findMainExeFile exeBi pps mainPath = do
    ppFile <- findFileWithExtension (ppSuffixes pps) (hsSourceDirs exeBi)
              (dropExtension mainPath)
    case ppFile of
      Nothing -> findFile (hsSourceDirs exeBi) mainPath
      Just pp -> return pp
  
  -- | Given a list of include paths, try to find the include file named
  -- @f@. Return the name of the file and the full path, or exit with error if
  -- there's no such file.
  findIncludeFile :: [FilePath] -> String -> IO (String, FilePath)
  findIncludeFile [] f = die ("can't find include file " ++ f)
  findIncludeFile (d:ds) f = do
    let path = (d </> f)
    b <- doesFileExist path
    if b then return (f,path) else findIncludeFile ds f
  
  -- | Remove the auto-generated module ('Paths_*') from 'exposed-modules' and
  -- 'other-modules'.
  filterAutogenModule :: PackageDescription -> PackageDescription
  filterAutogenModule pkg_descr0 = mapLib filterAutogenModuleLib $
                                   mapAllBuildInfo filterAutogenModuleBI pkg_descr0
    where
      mapLib f pkg = pkg { library = fmap f (library pkg) }
      filterAutogenModuleLib lib = lib {
        exposedModules = filter (/=autogenModule) (exposedModules lib)
      }
      filterAutogenModuleBI bi = bi {
        otherModules   = filter (/=autogenModule) (otherModules bi)
      }
      autogenModule = autogenModuleName pkg_descr0
  
  -- | Prepare a directory tree of source files for a snapshot version.
  -- It is expected that the appropriate snapshot version has already been set
  -- in the package description, eg using 'snapshotPackage' or 'snapshotVersion'.
  --
  prepareSnapshotTree :: Verbosity          -- ^verbosity
                      -> PackageDescription -- ^info from the cabal file
                      -> Maybe LocalBuildInfo
                      -> FilePath           -- ^source tree to populate
                      -> [PPSuffixHandler]  -- ^extra preprocessors (includes
                                            -- suffixes)
                      -> IO ()
  prepareSnapshotTree verbosity pkg mb_lbi targetDir pps = do
    prepareTree verbosity pkg mb_lbi targetDir pps
    overwriteSnapshotPackageDesc verbosity pkg targetDir
  
  overwriteSnapshotPackageDesc :: Verbosity          -- ^verbosity
                               -> PackageDescription -- ^info from the cabal file
                               -> FilePath           -- ^source tree
                               -> IO ()
  overwriteSnapshotPackageDesc verbosity pkg targetDir = do
      -- We could just writePackageDescription targetDescFile pkg_descr,
      -- but that would lose comments and formatting.
      descFile <- defaultPackageDesc verbosity
      withUTF8FileContents descFile $
        writeUTF8File (targetDir </> descFile)
          . unlines . map (replaceVersion (packageVersion pkg)) . lines
  
    where
      replaceVersion :: Version -> String -> String
      replaceVersion version line
        | "version:" `isPrefixOf` map toLower line
                    = "version: " ++ display version
        | otherwise = line
  
  -- | Modifies a 'PackageDescription' by appending a snapshot number
  -- corresponding to the given date.
  --
  snapshotPackage :: UTCTime -> PackageDescription -> PackageDescription
  snapshotPackage date pkg =
    pkg {
      package = pkgid { pkgVersion = snapshotVersion date (pkgVersion pkgid) }
    }
    where pkgid = packageId pkg
  
  -- | Modifies a 'Version' by appending a snapshot number corresponding
  -- to the given date.
  --
  snapshotVersion :: UTCTime -> Version -> Version
  snapshotVersion date version = version {
      versionBranch = versionBranch version
                   ++ [dateToSnapshotNumber date]
    }
  
  -- | Given a date produce a corresponding integer representation.
  -- For example given a date @18/03/2008@ produce the number @20080318@.
  --
  dateToSnapshotNumber :: UTCTime -> Int
  dateToSnapshotNumber date = case toGregorian (utctDay date) of
                              (year, month, day) ->
                                  fromIntegral year * 10000
                                + month             * 100
                                + day
  
  -- | Callback type for use by sdistWith.
  type CreateArchiveFun = Verbosity               -- ^verbosity
                          -> PackageDescription   -- ^info from cabal file
                          -> Maybe LocalBuildInfo -- ^info from configure
                          -> FilePath             -- ^source tree to archive
                          -> FilePath             -- ^name of archive to create
                          -> IO FilePath
  
  -- | Create an archive from a tree of source files, and clean up the tree.
  createArchive :: CreateArchiveFun
  createArchive verbosity pkg_descr mb_lbi tmpDir targetPref = do
    let tarBallFilePath = targetPref </> tarBallName pkg_descr <.> "tar.gz"
  
    (tarProg, _) <- requireProgram verbosity tarProgram
                      (maybe defaultProgramConfiguration withPrograms mb_lbi)
  
     -- Hmm: I could well be skating on thinner ice here by using the -C option
     -- (=> GNU tar-specific?)  [The prev. solution used pipes and sub-command
     -- sequences to set up the paths correctly, which is problematic in a Windows
     -- setting.]
    rawSystemProgram verbosity tarProg
             ["-C", tmpDir, "-czf", tarBallFilePath, tarBallName pkg_descr]
    return tarBallFilePath
  
  -- | Given a buildinfo, return the names of all source files.
  allSourcesBuildInfo :: BuildInfo
                         -> [PPSuffixHandler] -- ^ Extra preprocessors
                         -> [ModuleName]      -- ^ Exposed modules
                         -> IO [FilePath]
  allSourcesBuildInfo bi pps modules = do
    let searchDirs = hsSourceDirs bi
    sources <- sequence
      [ let file = ModuleName.toFilePath module_
        in findFileWithExtension suffixes searchDirs file
           >>= maybe (notFound module_) return
      | module_ <- modules ++ otherModules bi ]
    bootFiles <- sequence
      [ let file = ModuleName.toFilePath module_
            fileExts = ["hs-boot", "lhs-boot"]
        in findFileWithExtension fileExts (hsSourceDirs bi) file
      | module_ <- modules ++ otherModules bi ]
  
    return $ sources ++ catMaybes bootFiles ++ cSources bi
  
    where
      suffixes = ppSuffixes pps ++ ["hs", "lhs"]
      notFound m = die $ "Error: Could not find module: " ++ display m
                   ++ " with any suffix: " ++ show suffixes
  
  
  printPackageProblems :: Verbosity -> PackageDescription -> IO ()
  printPackageProblems verbosity pkg_descr = do
    ioChecks      <- checkPackageFiles pkg_descr "."
    let pureChecks = checkConfiguredPackage pkg_descr
        isDistError (PackageDistSuspicious _) = False
        isDistError _                         = True
        (errors, warnings) = partition isDistError (pureChecks ++ ioChecks)
    unless (null errors) $
        notice verbosity $ "Distribution quality errors:\n"
                        ++ unlines (map explanation errors)
    unless (null warnings) $
        notice verbosity $ "Distribution quality warnings:\n"
                        ++ unlines (map explanation warnings)
    unless (null errors) $
        notice verbosity
          "Note: the public hackage server would reject this package."
  
  ------------------------------------------------------------
  
  -- | The name of the tarball without extension
  --
  tarBallName :: PackageDescription -> String
  tarBallName = display . packageId
  
  mapAllBuildInfo :: (BuildInfo -> BuildInfo)
                  -> (PackageDescription -> PackageDescription)
  mapAllBuildInfo f pkg = pkg {
      library     = fmap mapLibBi (library pkg),
      executables = fmap mapExeBi (executables pkg),
      testSuites  = fmap mapTestBi (testSuites pkg),
      benchmarks  = fmap mapBenchBi (benchmarks pkg)
    }
    where
      mapLibBi lib  = lib { libBuildInfo       = f (libBuildInfo lib) }
      mapExeBi exe  = exe { buildInfo          = f (buildInfo exe) }
      mapTestBi t   = t   { testBuildInfo      = f (testBuildInfo t) }
      mapBenchBi bm = bm  { benchmarkBuildInfo = f (benchmarkBuildInfo bm) }
  