SrcDist.hs

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

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

-- 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
-- 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.
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 Distribution.Compat.Prelude
import Prelude ()

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

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

-- | 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 dieWithException 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 -> CabalException -> IO [FilePath])
  -- ^ 'die'' alternative.
  -- Since 'die'' prefixes the error message with 'errorPrefix',
  -- whatever is passed in here and wants to die should do the same.
  -- See issue #7331.
  -> 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
  -> (Verbosity -> CabalException -> IO [FilePath])
  -- ^ 'die'' alternative.
  -- Since 'die'' prefixes the error message with 'errorPrefix',
  -- whatever is passed in here and wants to die should do the same.
  -- See issue #7331.
  -> FilePath
  -- ^ directory with cabal file
  -> PackageDescription
  -- ^ info from the cabal file
  -> [PPSuffixHandler]
  -- ^ extra preprocessors (include suffixes)
  -> IO [FilePath]
  -- ^ relative paths
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 $ UnsupportedTestSuite (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 $ UnsupportedBenchMark (show tp)
    , -- Data files.
      fmap concat
        . for (dataFiles pkg_descr)
        $ \filename ->
          do
            let srcDataDirRaw = dataDir pkg_descr
                srcDataDir
                  | null srcDataDirRaw = "."
                  | otherwise = srcDataDirRaw
            matchDirFileGlobWithDie verbosity rip (specVersion pkg_descr) cwd (srcDataDir </> filename)
    , -- Extra source files.
      fmap concat . for (extraSrcFiles pkg_descr) $ \fpath ->
        matchDirFileGlobWithDie verbosity rip (specVersion pkg_descr) cwd fpath
    , -- Extra doc files.
      fmap concat
        . for (extraDocFiles pkg_descr)
        $ \filename ->
          matchDirFileGlobWithDie verbosity rip (specVersion pkg_descr) cwd filename
    , -- License file(s).
      return (map getSymbolicPath $ 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)
      (map getSymbolicPath (hsSourceDirs exeBi))
      (dropExtension mainPath)
  case ppFile of
    Nothing -> findFileCwd verbosity cwd (map getSymbolicPath (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 ("." : map getSymbolicPath (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 = dieWithException verbosity $ NoIncludeFileFound 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
    packageInfoModule = autogenPackageInfoModuleName pkg_descr0
    filterFunction bi = \mn ->
      mn /= pathsModule
        && mn /= packageInfoModule
        && 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 -> CabalException -> IO [FilePath])
  -- ^ 'die'' alternative.
  -- Since 'die'' prefixes the error message with 'errorPrefix',
  -- whatever is passed in here and wants to die should do the same.
  -- See issue #7331.
  -> FilePath
  -- ^ cwd -- change me to 'BuildPath Absolute PackageDir'
  -> BuildInfo
  -> [PPSuffixHandler]
  -- ^ Extra preprocessors
  -> [ModuleName]
  -- ^ Exposed modules
  -> IO [FilePath]
allSourcesBuildInfo verbosity rip cwd bi pps modules = do
  let searchDirs = map getSymbolicPath (hsSourceDirs bi)
  sources <-
    fmap concat $
      sequenceA $
        [ let file = ModuleName.toFilePath module_
           in -- 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.
              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 (map getSymbolicPath (hsSourceDirs bi)) file
      | module_ <- modules ++ otherModules bi
      ]

  return $
    sources
      ++ catMaybes bootFiles
      ++ cSources bi
      ++ cxxSources bi
      ++ cmmSources bi
      ++ asmSources bi
      ++ jsSources bi
  where
    nonEmpty' :: b -> ([a] -> b) -> [a] -> b
    nonEmpty' x _ [] = x
    nonEmpty' _ f xs = f xs

    suffixes = ppSuffixes pps ++ ["hs", "lhs", "hsig", "lhsig"]

    notFound :: ModuleName -> IO [FilePath]
    notFound m =
      rip verbosity $ NoModuleFound m suffixes

-- | 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
      (errors, warnings) = partition isHackageDistError (pureChecks ++ ioChecks)
  unless (null errors) $
    notice verbosity $
      "Distribution quality errors:\n"
        ++ unlines (map ppPackageCheck errors)
  unless (null warnings) $
    notice verbosity $
      "Distribution quality warnings:\n"
        ++ unlines (map ppPackageCheck 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)}