Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 610 lines (555 sloc) 26.45 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
-----------------------------------------------------------------------------
-- |
-- Module : Distribution.Simple.Hugs
-- Copyright : Isaac Jones 2003-2006
-- Duncan Coutts 2009
-- License : BSD3
--
-- Maintainer : cabal-devel@haskell.org
-- Portability : portable
--
-- This module contains most of the NHC-specific code for configuring, building
-- and installing packages.

module Distribution.Simple.Hugs (
    configure,
    getInstalledPackages,
    buildLib,
    buildExe,
    install,
    registerPackage,
  ) where

import Distribution.Package
         ( PackageName, PackageIdentifier(..), InstalledPackageId(..)
         , packageName )
import Distribution.InstalledPackageInfo
         ( InstalledPackageInfo, emptyInstalledPackageInfo
         , InstalledPackageInfo_( InstalledPackageInfo, installedPackageId
                                , sourcePackageId )
         , parseInstalledPackageInfo, showInstalledPackageInfo )
import Distribution.PackageDescription
         ( PackageDescription(..), BuildInfo(..), hcOptions, allExtensions
         , Executable(..), withExe, Library(..), withLib, libModules )
import Distribution.ModuleName (ModuleName)
import qualified Distribution.ModuleName as ModuleName
import Distribution.Simple.Compiler
         ( CompilerFlavor(..), CompilerId(..)
         , Compiler(..), Flag, languageToFlags, extensionsToFlags
         , PackageDB(..), PackageDBStack )
import qualified Distribution.Simple.PackageIndex as PackageIndex
import Distribution.Simple.PackageIndex (PackageIndex)
import Distribution.Simple.Program
         ( Program(programFindVersion)
         , ProgramConfiguration, userMaybeSpecifyPath
         , requireProgram, requireProgramVersion
         , rawSystemProgramConf, programPath
         , ffihugsProgram, hugsProgram )
import Distribution.Version
         ( Version(..), orLaterVersion )
import Distribution.Simple.PreProcess ( ppCpp, runSimplePreProcessor )
import Distribution.Simple.PreProcess.Unlit
                                ( unlit )
import Distribution.Simple.LocalBuildInfo
         ( LocalBuildInfo(..), ComponentLocalBuildInfo(..)
         , InstallDirs(..), absoluteInstallDirs )
import Distribution.Simple.BuildPaths
                                ( autogenModuleName, autogenModulesDir,
                                  dllExtension )
import Distribution.Simple.Setup
         ( CopyDest(..) )
import Distribution.Simple.Utils
         ( createDirectoryIfMissingVerbose
         , installOrdinaryFiles, setFileExecutable
         , withUTF8FileContents, writeFileAtomic, writeUTF8File
         , copyFileVerbose, findFile, findFileWithExtension, findModuleFiles
         , rawSystemStdInOut
         , die, info, notice )
import Language.Haskell.Extension
         ( Language(Haskell98), Extension(..), KnownExtension(..) )
import System.FilePath ( (</>), takeExtension, (<.>),
                                  searchPathSeparator, normalise, takeDirectory )
import Distribution.System
         ( OS(..), buildOS )
import Distribution.Text
         ( display, simpleParse )
import Distribution.ParseUtils
         ( ParseResult(..) )
import Distribution.Verbosity

import Data.Char ( isSpace )
import qualified Data.Map as M ( empty )
import Data.Maybe ( mapMaybe, catMaybes )
import Data.Monoid ( Monoid(..) )
import Control.Monad ( unless, when, filterM )
import Data.List ( nub, sort, isSuffixOf )
import System.Directory
         ( doesFileExist, doesDirectoryExist, getDirectoryContents
         , removeDirectoryRecursive, getHomeDirectory )
import System.Exit
         ( ExitCode(ExitSuccess) )
import Distribution.Compat.Exception
import Distribution.System ( Platform )

import qualified Data.ByteString.Lazy.Char8 as BS.Char8

-- -----------------------------------------------------------------------------
-- Configuring

configure :: Verbosity -> Maybe FilePath -> Maybe FilePath
          -> ProgramConfiguration -> IO (Compiler, Maybe Platform, ProgramConfiguration)
configure verbosity hcPath _hcPkgPath conf = do

  (_ffihugsProg, conf') <- requireProgram verbosity ffihugsProgram
                            (userMaybeSpecifyPath "ffihugs" hcPath conf)
  (_hugsProg, version, conf'')
                        <- requireProgramVersion verbosity hugsProgram'
                            (orLaterVersion (Version [2006] [])) conf'

  let comp = Compiler {
        compilerId = CompilerId Hugs version,
        compilerLanguages = hugsLanguages,
        compilerExtensions = hugsLanguageExtensions,
        compilerProperties = M.empty
      }
      compPlatform = Nothing
  return (comp, compPlatform, conf'')

  where
    hugsProgram' = hugsProgram { programFindVersion = getVersion }

getVersion :: Verbosity -> FilePath -> IO (Maybe Version)
getVersion verbosity hugsPath = do
  (output, _err, exit) <- rawSystemStdInOut verbosity hugsPath []
                              Nothing Nothing
                              (Just (":quit", False)) False
  if exit == ExitSuccess
    then return $! findVersion output
    else return Nothing

  where
    findVersion output = do
      (monthStr, yearStr) <- selectWords output
      year <- convertYear yearStr
      month <- convertMonth monthStr
      return (Version [year, month] [])

    selectWords output =
      case [ (month, year)
           | [_,_,"Version:", month, year,_] <- map words (lines output) ] of
        [(month, year)] -> Just (month, year)
        _ -> Nothing
    convertYear year = case reads year of
      [(y, [])] | y >= 1999 && y < 2020 -> Just y
      _ -> Nothing
    convertMonth month = lookup month (zip months [1..])
    months = [ "January", "February", "March", "April", "May", "June", "July"
             , "August", "September", "October", "November", "December" ]

hugsLanguages :: [(Language, Flag)]
hugsLanguages = [(Haskell98, "")] --default is 98 mode

-- | The flags for the supported extensions
hugsLanguageExtensions :: [(Extension, Flag)]
hugsLanguageExtensions =
    let doFlag (f, (enable, disable)) = [(EnableExtension f, enable),
                                         (DisableExtension f, disable)]
        alwaysOn = ("", ""{- wrong -})
        ext98 = ("-98", ""{- wrong -})
    in concatMap doFlag
    [(OverlappingInstances , ("+o", "-o"))
    ,(IncoherentInstances , ("+oO", "-O"))
    ,(HereDocuments , ("+H", "-H"))
    ,(TypeSynonymInstances , ext98)
    ,(RecursiveDo , ext98)
    ,(ParallelListComp , ext98)
    ,(MultiParamTypeClasses , ext98)
    ,(FunctionalDependencies , ext98)
    ,(Rank2Types , ext98)
    ,(PolymorphicComponents , ext98)
    ,(ExistentialQuantification , ext98)
    ,(ScopedTypeVariables , ext98)
    ,(ImplicitParams , ext98)
    ,(ExtensibleRecords , ext98)
    ,(RestrictedTypeSynonyms , ext98)
    ,(FlexibleContexts , ext98)
    ,(FlexibleInstances , ext98)
    ,(ForeignFunctionInterface , alwaysOn)
    ,(EmptyDataDecls , alwaysOn)
    ,(CPP , alwaysOn)
    ]

getInstalledPackages :: Verbosity -> PackageDBStack -> ProgramConfiguration
                     -> IO PackageIndex
getInstalledPackages verbosity packagedbs conf = do
  homedir <- getHomeDirectory
  (hugsProg, _) <- requireProgram verbosity hugsProgram conf
  let hugsbindir = takeDirectory (programPath hugsProg)
      hugslibdir = takeDirectory hugsbindir </> "lib" </> "hugs"
      dbdirs = nub (concatMap (packageDbPaths homedir hugslibdir) packagedbs)
  indexes <- mapM getIndividualDBPackages dbdirs
  return $! mconcat indexes

  where
    getIndividualDBPackages :: FilePath -> IO PackageIndex
    getIndividualDBPackages dbdir = do
      pkgdirs <- getPackageDbDirs dbdir
      pkgs <- sequence [ getInstalledPackage pkgname pkgdir
                          | (pkgname, pkgdir) <- pkgdirs ]
      let pkgs' = map setInstalledPackageId (catMaybes pkgs)
      return (PackageIndex.fromList pkgs')

packageDbPaths :: FilePath -> FilePath -> PackageDB -> [FilePath]
packageDbPaths home hugslibdir db = case db of
  GlobalPackageDB -> [ hugslibdir </> "packages"
                            , "/usr/local/lib/hugs/packages" ]
  UserPackageDB -> [ home </> "lib/hugs/packages" ]
  SpecificPackageDB path -> [ path ]

getPackageDbDirs :: FilePath -> IO [(PackageName, FilePath)]
getPackageDbDirs dbdir = do
  dbexists <- doesDirectoryExist dbdir
  if not dbexists
    then return []
    else do
      entries <- getDirectoryContents dbdir
      pkgdirs <- sequence
        [ do pkgdirExists <- doesDirectoryExist pkgdir
             return (pkgname, pkgdir, pkgdirExists)
        | (entry, Just pkgname) <- [ (entry, simpleParse entry)
                                   | entry <- entries ]
        , let pkgdir = dbdir </> entry ]
      return [ (pkgname, pkgdir) | (pkgname, pkgdir, True) <- pkgdirs ]

getInstalledPackage :: PackageName -> FilePath -> IO (Maybe InstalledPackageInfo)
getInstalledPackage pkgname pkgdir = do
  let pkgconfFile = pkgdir </> "package.conf"
  pkgconfExists <- doesFileExist pkgconfFile

  let pathsModule = pkgdir </> ("Paths_" ++ display pkgname) <.> "hs"
  pathsModuleExists <- doesFileExist pathsModule

  case () of
    _ | pkgconfExists -> getFullInstalledPackageInfo pkgname pkgconfFile
      | pathsModuleExists -> getPhonyInstalledPackageInfo pkgname pathsModule
      | otherwise -> return Nothing

getFullInstalledPackageInfo :: PackageName -> FilePath
                            -> IO (Maybe InstalledPackageInfo)
getFullInstalledPackageInfo pkgname pkgconfFile =
  withUTF8FileContents pkgconfFile $ \contents ->
    case parseInstalledPackageInfo contents of
      ParseOk _ pkginfo | packageName pkginfo == pkgname
                        -> return (Just pkginfo)
      _ -> return Nothing

-- | This is a backup option for existing versions of Hugs which do not supply
-- proper installed package info files for the bundled libs. Instead we look
-- for the Paths_pkgname.hs file and extract the package version from that.
-- We don't know any other details for such packages, in particular we pretend
-- that they have no dependencies.
--
getPhonyInstalledPackageInfo :: PackageName -> FilePath
                             -> IO (Maybe InstalledPackageInfo)
getPhonyInstalledPackageInfo pkgname pathsModule = do
  content <- readFile pathsModule
  case extractVersion content of
    Nothing -> return Nothing
    Just version -> return (Just pkginfo)
      where
        pkgid = PackageIdentifier pkgname version
        pkginfo = emptyInstalledPackageInfo { sourcePackageId = pkgid }
  where
    -- search through the Paths_pkgname.hs file, looking for a line like:
    --
    -- > version = Version {versionBranch = [2,0], versionTags = []}
    --
    -- and parse it using 'Read'. Yes we are that evil.
    --
    extractVersion content =
      case [ version
           | ("version":"=":rest) <- map words (lines content)
           , (version, []) <- reads (concat rest) ] of
        [version] -> Just version
        _ -> Nothing

-- Older installed package info files did not have the installedPackageId
-- field, so if it is missing then we fill it as the source package ID.
setInstalledPackageId :: InstalledPackageInfo -> InstalledPackageInfo
setInstalledPackageId pkginfo@InstalledPackageInfo {
                        installedPackageId = InstalledPackageId "",
                        sourcePackageId = pkgid
                      }
                    = pkginfo {
                        --TODO use a proper named function for the conversion
                        -- from source package id to installed package id
                        installedPackageId = InstalledPackageId (display pkgid)
                      }
setInstalledPackageId pkginfo = pkginfo

-- -----------------------------------------------------------------------------
-- Building

-- |Building a package for Hugs.
buildLib :: Verbosity -> PackageDescription -> LocalBuildInfo
                      -> Library -> ComponentLocalBuildInfo -> IO ()
buildLib verbosity pkg_descr lbi lib _clbi = do
    let pref = scratchDir lbi
    createDirectoryIfMissingVerbose verbosity True pref
    copyFileVerbose verbosity (autogenModulesDir lbi </> paths_modulename)
                              (pref </> paths_modulename)
    compileBuildInfo verbosity pref [] (libModules lib) (libBuildInfo lib) lbi
  where
    paths_modulename = ModuleName.toFilePath (autogenModuleName pkg_descr)
                         <.> ".hs"
    --TODO: switch to using autogenModulesDir as a search dir, rather than
    -- always copying the file over.

-- |Building an executable for Hugs.
buildExe :: Verbosity -> PackageDescription -> LocalBuildInfo
                      -> Executable -> ComponentLocalBuildInfo -> IO ()
buildExe verbosity pkg_descr lbi
  exe@Executable {modulePath=mainPath, buildInfo=bi} _clbi = do
    let pref = scratchDir lbi
    createDirectoryIfMissingVerbose verbosity True pref
    
    let destDir = pref </> "programs"
    let exeMods = otherModules bi
    srcMainFile <- findFile (hsSourceDirs bi) mainPath
    let exeDir = destDir </> exeName exe
    let destMainFile = exeDir </> hugsMainFilename exe
    copyModule verbosity (EnableExtension CPP `elem` allExtensions bi) bi lbi srcMainFile destMainFile
    let destPathsFile = exeDir </> paths_modulename
    copyFileVerbose verbosity (autogenModulesDir lbi </> paths_modulename)
                              destPathsFile
    compileBuildInfo verbosity exeDir
      (maybe [] (hsSourceDirs . libBuildInfo) (library pkg_descr)) exeMods bi lbi
    compileFiles verbosity bi lbi exeDir [destMainFile, destPathsFile]

  where
    paths_modulename = ModuleName.toFilePath (autogenModuleName pkg_descr)
                         <.> ".hs"

compileBuildInfo :: Verbosity
                 -> FilePath -- ^output directory
                 -> [FilePath] -- ^library source dirs, if building exes
                 -> [ModuleName] -- ^Modules
                 -> BuildInfo
                 -> LocalBuildInfo
                 -> IO ()
--TODO: should not be using mLibSrcDirs at all
compileBuildInfo verbosity destDir mLibSrcDirs mods bi lbi = do
    -- Pass 1: copy or cpp files from build directory to scratch directory
    let useCpp = EnableExtension CPP `elem` allExtensions bi
    let srcDir = buildDir lbi
        srcDirs = nub $ srcDir : hsSourceDirs bi ++ mLibSrcDirs
    info verbosity $ "Source directories: " ++ show srcDirs
    flip mapM_ mods $ \ m -> do
        fs <- findFileWithExtension suffixes srcDirs (ModuleName.toFilePath m)
        case fs of
          Nothing ->
            die ("can't find source for module " ++ display m)
          Just srcFile -> do
            let ext = takeExtension srcFile
            copyModule verbosity useCpp bi lbi srcFile
                (destDir </> ModuleName.toFilePath m <.> ext)
    -- Pass 2: compile foreign stubs in scratch directory
    stubsFileLists <- fmap catMaybes $ sequence
      [ findFileWithExtension suffixes [destDir] (ModuleName.toFilePath modu)
      | modu <- mods]
    compileFiles verbosity bi lbi destDir stubsFileLists

suffixes :: [String]
suffixes = ["hs", "lhs"]

-- Copy or cpp a file from the source directory to the build directory.
copyModule :: Verbosity -> Bool -> BuildInfo -> LocalBuildInfo -> FilePath -> FilePath -> IO ()
copyModule verbosity cppAll bi lbi srcFile destFile = do
    createDirectoryIfMissingVerbose verbosity True (takeDirectory destFile)
    (exts, opts, _) <- getOptionsFromSource srcFile
    let ghcOpts = [ op | (GHC, ops) <- opts, op <- ops ]
    if cppAll || EnableExtension CPP `elem` exts || "-cpp" `elem` ghcOpts then do
        runSimplePreProcessor (ppCpp bi lbi) srcFile destFile verbosity
        return ()
      else
        copyFileVerbose verbosity srcFile destFile

compileFiles :: Verbosity -> BuildInfo -> LocalBuildInfo -> FilePath -> [FilePath] -> IO ()
compileFiles verbosity bi lbi modDir fileList = do
    ffiFileList <- filterM testFFI fileList
    unless (null ffiFileList) $ do
        notice verbosity "Compiling FFI stubs"
        mapM_ (compileFFI verbosity bi lbi modDir) ffiFileList

-- Only compile FFI stubs for a file if it contains some FFI stuff
testFFI :: FilePath -> IO Bool
testFFI file =
  withHaskellFile file $ \inp ->
    return $! "foreign" `elem` symbols (stripComments False inp)

compileFFI :: Verbosity -> BuildInfo -> LocalBuildInfo -> FilePath -> FilePath -> IO ()
compileFFI verbosity bi lbi modDir file = do
    (_, opts, file_incs) <- getOptionsFromSource file
    let ghcOpts = [ op | (GHC, ops) <- opts, op <- ops ]
    let pkg_incs = ["\"" ++ inc ++ "\"" | inc <- includes bi]
    let incs = nub (sort (file_incs ++ includeOpts ghcOpts ++ pkg_incs))
    let pathFlag = "-P" ++ modDir ++ [searchPathSeparator]
    let hugsArgs = "-98" : pathFlag : map ("-i" ++) incs
    cfiles <- getCFiles file
    let cArgs =
            ["-I" ++ dir | dir <- includeDirs bi] ++
            ccOptions bi ++
            cfiles ++
            ["-L" ++ dir | dir <- extraLibDirs bi] ++
            ldOptions bi ++
            ["-l" ++ lib | lib <- extraLibs bi] ++
            concat [["-framework", f] | f <- frameworks bi]
    rawSystemProgramConf verbosity ffihugsProgram (withPrograms lbi)
      (hugsArgs ++ file : cArgs)

includeOpts :: [String] -> [String]
includeOpts [] = []
includeOpts ("-#include" : arg : opts) = arg : includeOpts opts
includeOpts (_ : opts) = includeOpts opts

-- get C file names from CFILES pragmas throughout the source file
getCFiles :: FilePath -> IO [String]
getCFiles file =
  withHaskellFile file $ \inp ->
    let cfiles =
          [ normalise cfile
          | "{-#" : "CFILES" : rest <- map words
                                     $ lines
                                     $ stripComments True inp
          , last rest == "#-}"
          , cfile <- init rest]
     in seq (length cfiles) (return cfiles)

-- List of terminal symbols in a source file.
symbols :: String -> [String]
symbols cs = case lex cs of
    (sym, cs'):_ | not (null sym) -> sym : symbols cs'
    _ -> []

-- Get the non-literate source of a Haskell module.
withHaskellFile :: FilePath -> (String -> IO a) -> IO a
withHaskellFile file action =
    withUTF8FileContents file $ \text ->
        if ".lhs" `isSuffixOf` file
          then either action die (unlit file text)
          else action text

-- ------------------------------------------------------------
-- * options in source files
-- ------------------------------------------------------------

-- |Read the initial part of a source file, before any Haskell code,
-- and return the contents of any LANGUAGE, OPTIONS and INCLUDE pragmas.
getOptionsFromSource
    :: FilePath
    -> IO ([Extension], -- LANGUAGE pragma, if any
           [(CompilerFlavor,[String])], -- OPTIONS_FOO pragmas
           [String] -- INCLUDE pragmas
          )
getOptionsFromSource file =
    withHaskellFile file $
        (return $!)
      . foldr appendOptions ([],[],[]) . map getOptions
      . takeWhileJust . map getPragma
      . filter textLine . map (dropWhile isSpace) . lines
      . stripComments True

  where textLine [] = False
        textLine ('#':_) = False
        textLine _ = True

        getPragma :: String -> Maybe [String]
        getPragma line = case words line of
            ("{-#" : rest) | last rest == "#-}" -> Just (init rest)
            _ -> Nothing

        getOptions ("OPTIONS":opts) = ([], [(GHC, opts)], [])
        getOptions ("OPTIONS_GHC":opts) = ([], [(GHC, opts)], [])
        getOptions ("OPTIONS_NHC98":opts) = ([], [(NHC, opts)], [])
        getOptions ("OPTIONS_HUGS":opts) = ([], [(Hugs, opts)], [])
        getOptions ("LANGUAGE":ws) = (mapMaybe readExtension ws, [], [])
          where readExtension :: String -> Maybe Extension
                readExtension w = case reads w of
                    [(ext, "")] -> Just ext
                    [(ext, ",")] -> Just ext
                    _ -> Nothing
        getOptions ("INCLUDE":ws) = ([], [], ws)
        getOptions _ = ([], [], [])

        appendOptions (exts, opts, incs) (exts', opts', incs')
          = (exts++exts', opts++opts', incs++incs')

-- takeWhileJust f = map fromJust . takeWhile isJust
takeWhileJust :: [Maybe a] -> [a]
takeWhileJust (Just x:xs) = x : takeWhileJust xs
takeWhileJust _ = []

-- |Strip comments from Haskell source.
stripComments
    :: Bool -- ^ preserve pragmas?
    -> String -- ^ input source text
    -> String
stripComments keepPragmas = stripCommentsLevel 0
  where stripCommentsLevel :: Int -> String -> String
        stripCommentsLevel 0 ('"':cs) = '"':copyString cs
        stripCommentsLevel 0 ('-':'-':cs) = -- FIX: symbols like -->
            stripCommentsLevel 0 (dropWhile (/= '\n') cs)
        stripCommentsLevel 0 ('{':'-':'#':cs)
          | keepPragmas = '{' : '-' : '#' : copyPragma cs
        stripCommentsLevel n ('{':'-':cs) = stripCommentsLevel (n+1) cs
        stripCommentsLevel 0 (c:cs) = c : stripCommentsLevel 0 cs
        stripCommentsLevel n ('-':'}':cs) = stripCommentsLevel (n-1) cs
        stripCommentsLevel n (_:cs) = stripCommentsLevel n cs
        stripCommentsLevel _ [] = []

        copyString ('\\':c:cs) = '\\' : c : copyString cs
        copyString ('"':cs) = '"' : stripCommentsLevel 0 cs
        copyString (c:cs) = c : copyString cs
        copyString [] = []

        copyPragma ('#':'-':'}':cs) = '#' : '-' : '}' : stripCommentsLevel 0 cs
        copyPragma (c:cs) = c : copyPragma cs
        copyPragma [] = []

-- -----------------------------------------------------------------------------
-- |Install for Hugs.
-- For install, copy-prefix = prefix, but for copy they're different.
-- The library goes in \<copy-prefix>\/lib\/hugs\/packages\/\<pkgname>
-- (i.e. \<prefix>\/lib\/hugs\/packages\/\<pkgname> on the target system).
-- Each executable goes in \<copy-prefix>\/lib\/hugs\/programs\/\<exename>
-- (i.e. \<prefix>\/lib\/hugs\/programs\/\<exename> on the target system)
-- with a script \<copy-prefix>\/bin\/\<exename> pointing at
-- \<prefix>\/lib\/hugs\/programs\/\<exename>.
install
    :: Verbosity -- ^verbosity
    -> LocalBuildInfo
    -> FilePath -- ^Library install location
    -> FilePath -- ^Program install location
    -> FilePath -- ^Executable install location
    -> FilePath -- ^Program location on target system
    -> FilePath -- ^Build location
    -> (FilePath,FilePath) -- ^Executable (prefix,suffix)
    -> PackageDescription
    -> IO ()
--FIXME: this script should be generated at build time, just installed at this stage
install verbosity lbi libDir installProgDir binDir targetProgDir buildPref (progprefix,progsuffix) pkg_descr = do
    removeDirectoryRecursive libDir `catchIO` \_ -> return ()
    withLib pkg_descr $ \ lib ->
      findModuleFiles [buildPref] hugsInstallSuffixes (libModules lib)
        >>= installOrdinaryFiles verbosity libDir
    let buildProgDir = buildPref </> "programs"
    when (any (buildable . buildInfo) (executables pkg_descr)) $
        createDirectoryIfMissingVerbose verbosity True binDir
    withExe pkg_descr $ \ exe -> do
        let bi = buildInfo exe
        let theBuildDir = buildProgDir </> exeName exe
        let installDir = installProgDir </> exeName exe
        let targetDir = targetProgDir </> exeName exe
        removeDirectoryRecursive installDir `catchIO` \_ -> return ()
        findModuleFiles [theBuildDir] hugsInstallSuffixes
                        (ModuleName.main : autogenModuleName pkg_descr
                                         : otherModules (buildInfo exe))
          >>= installOrdinaryFiles verbosity installDir
        let targetName = "\"" ++ (targetDir </> hugsMainFilename exe) ++ "\""
        let hugsOptions = hcOptions Hugs (buildInfo exe)
                       ++ languageToFlags (compiler lbi) (defaultLanguage bi)
                       ++ extensionsToFlags (compiler lbi) (allExtensions bi)
            --TODO: also need to consider options, extensions etc of deps
            -- see ticket #43
        let baseExeFile = progprefix ++ (exeName exe) ++ progsuffix
        let exeFile = case buildOS of
                          Windows -> binDir </> baseExeFile <.> ".bat"
                          _ -> binDir </> baseExeFile
        let script = case buildOS of
                         Windows ->
                             let args = hugsOptions ++ [targetName, "%*"]
                             in unlines ["@echo off",
                                         unwords ("runhugs" : args)]
                         _ ->
                             let args = hugsOptions ++ [targetName, "\"$@\""]
                             in unlines ["#! /bin/sh",
                                         unwords ("runhugs" : args)]
        writeFileAtomic exeFile (BS.Char8.pack script)
        setFileExecutable exeFile

hugsInstallSuffixes :: [String]
hugsInstallSuffixes = [".hs", ".lhs", dllExtension]

-- |Filename used by Hugs for the main module of an executable.
-- This is a simple filename, so that Hugs will look for any auxiliary
-- modules it uses relative to the directory it's in.
hugsMainFilename :: Executable -> FilePath
hugsMainFilename exe = "Main" <.> ext
  where ext = takeExtension (modulePath exe)

-- -----------------------------------------------------------------------------
-- Registering

registerPackage
  :: Verbosity
  -> InstalledPackageInfo
  -> PackageDescription
  -> LocalBuildInfo
  -> Bool
  -> PackageDBStack
  -> IO ()
registerPackage verbosity installedPkgInfo pkg lbi inplace _packageDbs = do
  --TODO: prefer to have it based on the packageDbs, but how do we know
  -- the package subdir based on the name? the user can set crazy libsubdir
  let installDirs = absoluteInstallDirs pkg lbi NoCopyDest
      pkgdir | inplace = buildDir lbi
              | otherwise = libdir installDirs
  createDirectoryIfMissingVerbose verbosity True pkgdir
  writeUTF8File (pkgdir </> "package.conf")
                (showInstalledPackageInfo installedPkgInfo)
Something went wrong with that request. Please try again.