{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE RankNTypes #-}

-----------------------------------------------------------------------------
-- |
-- Module      :  Distribution.Simple.SrcDist
-- Copyright   :  Simon Marlow 2004
-- License     :  BSD3
--
-- 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.

-- 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,
  listPackageSourcesWithDie,

  )  where

import Prelude ()
import Distribution.Compat.Prelude

import Distribution.PackageDescription
import Distribution.PackageDescription.Check hiding (doesFileExist)
import Distribution.Package
import Distribution.ModuleName
import qualified Distribution.ModuleName as ModuleName
import Distribution.Version
import Distribution.Simple.Configure (findDistPrefOrDefault)
import Distribution.Simple.Glob
import Distribution.Simple.Utils
import Distribution.Simple.Setup
import Distribution.Simple.PreProcess
import Distribution.Simple.BuildPaths
import Distribution.Simple.Program
import Distribution.Pretty
import Distribution.Verbosity

import qualified Data.Map as Map
import Data.Time (UTCTime, getCurrentTime, toGregorian, utctDay)
import System.Directory ( doesFileExist )
import System.IO (IOMode(WriteMode), hPutStrLn, withFile)
import System.FilePath ((</>), (<.>), dropExtension, isRelative)

-- |Create a source distribution.
sdist :: PackageDescription     -- ^ information from the tarball
      -> SDistFlags             -- ^ verbosity & snapshot
      -> (FilePath -> FilePath) -- ^ build prefix (temp dir)
      -> [PPSuffixHandler]      -- ^ extra preprocessors (includes suffixes)
      -> IO ()
sdist pkg flags mkTmpDir pps = do

  distPref <- findDistPrefOrDefault $ sDistDistPref flags
  let targetPref   = distPref
      tmpTargetDir = mkTmpDir distPref

  -- 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 <- listPackageSources verbosity "." pkg pps
      traverse_ (hPutStrLn outHandle) ordinary
      notice verbosity $ "List of package sources written to file '" ++ path ++ "'"

    NoFlag    -> do
      -- do some QA
      printPackageProblems verbosity pkg

      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' tmpDir targetPref
            notice verbosity $ "Source tarball created: " ++ targzFile

  where
    generateSourceDir :: FilePath -> PackageDescription -> IO ()
    generateSourceDir targetDir pkg' = do
      setupMessage verbosity "Building source dist for" (packageId pkg')
      prepareTree verbosity pkg' targetDir pps
      when snapshot $
        overwriteSnapshotPackageDesc verbosity pkg' targetDir

    verbosity = fromFlag (sDistVerbosity flags)
    snapshot  = fromFlag (sDistSnapshot flags)

-- | List all source files of a package.
--
-- Since @Cabal-3.4@ returns a single list. There shouldn't be any
-- executable files, they are hardly portable.
-- 
listPackageSources
    :: Verbosity          -- ^ verbosity
    -> FilePath           -- ^ directory with cabal file
    -> PackageDescription -- ^ info from the cabal file
    -> [PPSuffixHandler]  -- ^ extra preprocessors (include suffixes)
    -> IO [FilePath]      -- ^ relative paths
listPackageSources verbosity cwd pkg_descr0 pps = do
    -- Call helpers that actually do all work.
    listPackageSources' verbosity die' cwd pkg_descr pps
  where
    pkg_descr = filterAutogenModules pkg_descr0

-- | A variant of 'listPackageSources' with configurable 'die'.
--
-- /Note:/ may still 'die' directly. For example on missing include file.
--
-- Since @3.4.0.0
listPackageSourcesWithDie
    :: Verbosity          -- ^ verbosity
    -> (Verbosity -> String -> IO [FilePath]) -- ^ 'die'' alternative
    -> FilePath           -- ^ directory with cabal file
    -> PackageDescription -- ^ info from the cabal file
    -> [PPSuffixHandler]  -- ^ extra preprocessors (include suffixes)
    -> IO [FilePath]      -- ^ relative paths
listPackageSourcesWithDie verbosity rip cwd pkg_descr0 pps = do
    -- Call helpers that actually do all work.
    listPackageSources' verbosity rip cwd pkg_descr pps
  where
    pkg_descr = filterAutogenModules pkg_descr0


listPackageSources'
  :: Verbosity
  -> (Verbosity -> String -> IO [FilePath])
  -> FilePath
  -> PackageDescription
  -> [PPSuffixHandler]
  -> IO [FilePath]
listPackageSources' verbosity rip cwd pkg_descr pps =
  fmap concat . sequenceA $
  [
    -- Library sources.
    fmap concat
    . withAllLib $ \Library {
                      exposedModules = modules,
                      signatures     = sigs,
                      libBuildInfo   = libBi
                    } ->
     allSourcesBuildInfo verbosity rip cwd libBi pps (modules ++ sigs)

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

    -- Foreign library sources
  , fmap concat
    . withAllFLib $ \flib@(ForeignLib { foreignLibBuildInfo = flibBi }) -> do
       biSrcs   <- allSourcesBuildInfo verbosity rip cwd flibBi pps []
       defFiles <- traverse (findModDefFile verbosity cwd flibBi pps)
         (foreignLibModDefFile flib)
       return (defFiles ++ biSrcs)

    -- Test suites sources.
  , fmap concat
    . withAllTest $ \t -> do
       let bi  = testBuildInfo t
       case testInterface t of
         TestSuiteExeV10 _ mainPath -> do
           biSrcs <- allSourcesBuildInfo verbosity rip cwd bi pps []
           srcMainFile <- findMainExeFile verbosity cwd bi pps mainPath
           return (srcMainFile:biSrcs)
         TestSuiteLibV09 _ m ->
           allSourcesBuildInfo verbosity rip cwd bi pps [m]
         TestSuiteUnsupported tp ->
           rip verbosity $ "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 verbosity rip cwd bi pps []
           srcMainFile <- findMainExeFile verbosity cwd bi pps mainPath
           return (srcMainFile:biSrcs)
         BenchmarkUnsupported tp ->
            rip verbosity $ "Unsupported benchmark type: " ++ show tp

    -- Data files.
  , fmap concat
    . for (dataFiles pkg_descr) $ \filename -> do
        let srcDataDirRaw                   = dataDir pkg_descr
            srcDataDir | null srcDataDirRaw = "."
                       | otherwise          = srcDataDirRaw
        matchDirFileGlob verbosity (specVersion pkg_descr) cwd (srcDataDir </> filename)

    -- Extra source files.
  , fmap concat . for (extraSrcFiles pkg_descr) $ \fpath ->
    matchDirFileGlob verbosity (specVersion pkg_descr) cwd fpath

    -- Extra doc files.
  , fmap concat
    . for (extraDocFiles pkg_descr) $ \ filename ->
        matchDirFileGlob verbosity (specVersion pkg_descr) cwd filename

    -- License file(s).
  , return (licenseFiles pkg_descr)

    -- Install-include files, without autogen-include files
  , fmap concat
    . withAllLib $ \ l -> do
       let lbi   = libBuildInfo l
           incls = filter (`notElem` autogenIncludes lbi) (installIncludes lbi)
           relincdirs = "." : filter isRelative (includeDirs lbi)
       traverse (fmap snd . findIncludeFile verbosity cwd relincdirs) incls

    -- Setup script, if it exists.
  , fmap (maybe [] (\f -> [f])) $ findSetupFile cwd

    -- The .cabal file itself.
  , fmap (\d -> [d]) (tryFindPackageDescCwd verbosity cwd ".")

  ]
  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 = traverse action (allLibraries pkg_descr)
    withAllFLib      action = traverse action (foreignLibs pkg_descr)
    withAllExe       action = traverse action (executables pkg_descr)
    withAllTest      action = traverse action (testSuites pkg_descr)
    withAllBenchmark action = traverse action (benchmarks pkg_descr)


-- |Prepare a directory tree of source files.
prepareTree :: Verbosity          -- ^verbosity
            -> PackageDescription -- ^info from the cabal file
            -> FilePath           -- ^source tree to populate
            -> [PPSuffixHandler]  -- ^extra preprocessors (includes suffixes)
            -> IO ()
prepareTree verbosity pkg_descr0 targetDir pps = do
    ordinary <- listPackageSources verbosity "." pkg_descr pps
    installOrdinaryFiles verbosity targetDir (zip (repeat []) ordinary)
    maybeCreateDefaultSetupScript targetDir
  where
    pkg_descr = filterAutogenModules pkg_descr0

-- | Find the setup script file, if it exists.
findSetupFile :: FilePath -> IO (Maybe FilePath)
findSetupFile targetDir = do
  hsExists  <- doesFileExist (targetDir </> setupHs)
  lhsExists <- doesFileExist (targetDir </> setupLhs)
  if hsExists
    then return (Just setupHs)
    else if lhsExists
         then return (Just setupLhs)
         else return Nothing
    where
      setupHs  = "Setup.hs"
      setupLhs = "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
  :: Verbosity
  -> FilePath -- ^ cwd
  -> BuildInfo
  -> [PPSuffixHandler]
  -> FilePath -- ^ main-is
  -> IO FilePath
findMainExeFile verbosity cwd exeBi pps mainPath = do
  ppFile <- findFileCwdWithExtension cwd (ppSuffixes pps) (hsSourceDirs exeBi)
            (dropExtension mainPath)
  case ppFile of
    Nothing -> findFileCwd verbosity cwd (hsSourceDirs exeBi) mainPath
    Just pp -> return pp

-- | Find a module definition file
--
-- TODO: I don't know if this is right
findModDefFile
  :: Verbosity -> FilePath -> BuildInfo -> [PPSuffixHandler] -> FilePath -> IO FilePath
findModDefFile verbosity cwd flibBi _pps modDefPath =
    findFileCwd verbosity cwd (".":hsSourceDirs flibBi) modDefPath

-- | 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 :: Verbosity -> FilePath -> [FilePath] -> String -> IO (String, FilePath)
findIncludeFile verbosity _ [] f = die' verbosity ("can't find include file " ++ f)
findIncludeFile verbosity cwd (d:ds) f = do
  let path = (d </> f)
  b <- doesFileExist (cwd </> path)
  if b then return (f,path) else findIncludeFile verbosity cwd ds f

-- | Remove the auto-generated modules (like 'Paths_*') from 'exposed-modules' 
-- and 'other-modules'.
filterAutogenModules :: PackageDescription -> PackageDescription
filterAutogenModules pkg_descr0 = mapLib filterAutogenModuleLib $
                                 mapAllBuildInfo filterAutogenModuleBI pkg_descr0
  where
    mapLib f pkg = pkg { library      = fmap f (library pkg)
                       , subLibraries = map f (subLibraries pkg) }
    filterAutogenModuleLib lib = lib {
      exposedModules = filter (filterFunction (libBuildInfo lib)) (exposedModules lib)
    }
    filterAutogenModuleBI bi = bi {
      otherModules   = filter (filterFunction bi) (otherModules bi)
    }
    pathsModule = autogenPathsModuleName pkg_descr0
    filterFunction bi = \mn ->
                                   mn /= pathsModule
                                && not (mn `elem` autogenModules bi)

-- | 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
  -> FilePath           -- ^source tree to populate
  -> [PPSuffixHandler]  -- ^extra preprocessors (includes suffixes)
  -> IO ()
prepareSnapshotTree verbosity pkg targetDir pps = do
  prepareTree verbosity pkg 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: " ++ prettyShow 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 = alterVersion (++ [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

-- | Create an archive from a tree of source files, and clean up the tree.
createArchive
    :: Verbosity            -- ^ verbosity
    -> PackageDescription   -- ^ info from cabal file
    -> FilePath             -- ^ source tree to archive
    -> FilePath             -- ^ name of archive to create
    -> IO FilePath
createArchive verbosity pkg_descr tmpDir targetPref = do
  let tarBallFilePath = targetPref </> tarBallName pkg_descr <.> "tar.gz"
  (tarProg, _) <- requireProgram verbosity tarProgram defaultProgramDb
  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
    :: Verbosity
    -> (Verbosity -> String -> IO [FilePath])
    -> FilePath          -- ^ cwd
    -> BuildInfo
    -> [PPSuffixHandler] -- ^ Extra preprocessors
    -> [ModuleName]      -- ^ Exposed modules
    -> IO [FilePath]
allSourcesBuildInfo verbosity rip cwd bi pps modules = do
  let searchDirs = hsSourceDirs bi
  sources <- fmap concat $ sequenceA $
    [ let file = ModuleName.toFilePath module_
      -- NB: *Not* findFileWithExtension, because the same source
      -- file may show up in multiple paths due to a conditional;
      -- we need to package all of them.  See #367.
      in findAllFilesCwdWithExtension cwd suffixes searchDirs file
         >>= nonEmpty (notFound module_) return
    | module_ <- modules ++ otherModules bi ]
  bootFiles <- sequenceA
    [ let file = ModuleName.toFilePath module_
          fileExts = ["hs-boot", "lhs-boot"]
      in findFileCwdWithExtension cwd fileExts (hsSourceDirs bi) file
    | module_ <- modules ++ otherModules bi ]

  return $ sources ++ catMaybes bootFiles ++ cSources bi ++ cxxSources bi ++
           cmmSources bi ++ asmSources bi ++ jsSources bi

  where
    nonEmpty x _ [] = x
    nonEmpty _ f xs = f xs
    suffixes = ppSuffixes pps ++ ["hs", "lhs", "hsig", "lhsig"]

    notFound :: ModuleName -> IO [FilePath]
    notFound m = rip verbosity $ "Error: Could not find module: " ++ prettyShow m
                 ++ " with any suffix: " ++ show suffixes ++ ". If the module "
                 ++ "is autogenerated it should be added to 'autogen-modules'."


-- | Note: must be called with the CWD set to the directory containing
-- the '.cabal' file.
printPackageProblems :: Verbosity -> PackageDescription -> IO ()
printPackageProblems verbosity pkg_descr = do
  ioChecks      <- checkPackageFiles verbosity 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 = prettyShow . packageId

mapAllBuildInfo :: (BuildInfo -> BuildInfo)
                -> (PackageDescription -> PackageDescription)
mapAllBuildInfo f pkg = pkg {
    library     = fmap mapLibBi (library pkg),
    subLibraries = fmap mapLibBi (subLibraries pkg),
    foreignLibs = fmap mapFLibBi (foreignLibs pkg),
    executables = fmap mapExeBi (executables pkg),
    testSuites  = fmap mapTestBi (testSuites pkg),
    benchmarks  = fmap mapBenchBi (benchmarks pkg)
  }
  where
    mapLibBi   lib  = lib  { libBuildInfo        = f (libBuildInfo lib) }
    mapFLibBi  flib = flib { foreignLibBuildInfo = f (foreignLibBuildInfo flib) }
    mapExeBi   exe  = exe  { buildInfo           = f (buildInfo exe) }
    mapTestBi  tst  = tst  { testBuildInfo       = f (testBuildInfo tst) }
    mapBenchBi bm   = bm   { benchmarkBuildInfo  = f (benchmarkBuildInfo bm) }
