-----------------------------------------------------------------------------
-- |
-- Module      :  Distribution.Simple.SrcDist
-- Copyright   :  Simon Marlow 2004
-- License     :  BSD3
--
-- Maintainer  :  [email protected]
-- 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.

-- 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,

  -- ** Snapshots
  prepareSnapshotTree,
  snapshotPackage,
  snapshotVersion,
  dateToSnapshotNumber,

  -- * Extracting the source files
  listPackageSources

  )  where

import Distribution.PackageDescription hiding (Flag)
import Distribution.PackageDescription.Check hiding (doesFileExist)
import Distribution.Package
import Distribution.ModuleName
import qualified Distribution.ModuleName as ModuleName
import Distribution.Version
import Distribution.Simple.Utils
import Distribution.Simple.Setup
import Distribution.Simple.PreProcess
import Distribution.Simple.LocalBuildInfo
import Distribution.Simple.BuildPaths
import Distribution.Simple.Program
import Distribution.Text
import Distribution.Verbosity

import Control.Monad(when, unless, forM)
import Data.Char (toLower)
import Data.List (partition, isPrefixOf)
import qualified Data.Map as Map
import Data.Maybe (isNothing, catMaybes)
import Data.Time (UTCTime, getCurrentTime, toGregorian, utctDay)
import System.Directory ( doesFileExist )
import System.IO (IOMode(WriteMode), hPutStrLn, withFile)
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'
          info 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.
    withAllLib $ \Library { exposedModules = modules, libBuildInfo = libBi } ->
     allSourcesBuildInfo libBi pps modules

    -- Executables sources.
  , fmap concat
    . withAllExe $ \Executable { modulePath = mainPath, buildInfo = exeBi } -> do
       biSrcs  <- allSourcesBuildInfo exeBi pps []
       mainSrc <- findMainExeFile exeBi pps mainPath
       return (mainSrc:biSrcs)

    -- Test suites sources.
  , fmap concat
    . withAllTest $ \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
    . withAllBenchmark $ \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(s).
  , return (licenseFiles pkg_descr)

    -- Install-include files.
  , withAllLib $ \ 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:
    withAllLib       action = maybe (return []) action (library pkg_descr)
    withAllExe       action = mapM action (executables pkg_descr)
    withAllTest      action = mapM action (testSuites pkg_descr)
    withAllBenchmark 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)
  let formatOptSupported = maybe False (== "YES") $
                           Map.lookup "Supports --format"
                           (programProperties tarProg)
  runProgram verbosity tarProg $
    -- Hmm: I could well be skating on thinner ice here by using the -C option
    -- (=> seems to be supported at least by GNU and *BSD tar) [The
    -- prev. solution used pipes and sub-command sequences to set up the paths
    -- correctly, which is problematic in a Windows setting.]
    ["-czf", tarBallFilePath, "-C", tmpDir]
    ++ (if formatOptSupported then ["--format", "ustar"] else [])
    ++ [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 <- fmap concat $ sequence $
    [ let file = ModuleName.toFilePath module_
      in findAllFilesWithExtension suffixes searchDirs file
         >>= nonEmpty (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 ++ jsSources bi

  where
    nonEmpty x _ [] = x
    nonEmpty _ f xs = f xs
    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 (PackageDistSuspiciousWarn _) = 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) }