cabal-helper (empty) → 0.1.0.0

raw patch · 5 files changed

+1451/−0 lines, 5 filesdep +Cabaldep +basedep +bytestringsetup-changed

Dependencies added: Cabal, base, bytestring, data-default, directory, filepath, mtl, process, template-haskell, temporary, transformers

Files

CabalHelper/Wrapper.hs +368/−0
Distribution/Helper.hs +285/−0
LICENSE +661/−0
Setup.hs +70/−0
cabal-helper.cabal +67/−0

+ CabalHelper/Wrapper.hs view

@@ -0,0 +1,368 @@+-- cabal-helper: Simple interface to Cabal's configuration state+-- Copyright (C) 2015  Daniel Gröber <dxld ÄT darkboxed DOT org>+--+-- This program is free software: you can redistribute it and/or modify+-- it under the terms of the GNU Affero General Public License as published by+-- the Free Software Foundation, either version 3 of the License, or+-- (at your option) any later version.+--+-- This program is distributed in the hope that it will be useful,+-- but WITHOUT ANY WARRANTY; without even the implied warranty of+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+-- GNU Affero General Public License for more details.+--+-- You should have received a copy of the GNU Affero General Public License+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.++{-# LANGUAGE RecordWildCards, FlexibleContexts #-}+module Main where++import Control.Applicative+import Control.Arrow+import Control.Exception as E+import Control.Monad+import Control.Monad.Trans.Maybe+import Control.Monad.IO.Class+import Data.Char+import Data.List+import Data.Maybe+import Data.String+import Data.Version+import Text.Printf+import System.Console.GetOpt+import System.Environment+import System.Directory+import System.FilePath+import System.Process+import System.Exit+import System.IO++import Distribution.System (buildPlatform)+import Distribution.Text (display)++import Paths_cabal_helper (version)+import CabalHelper.Data+import CabalHelper.Common+import CabalHelper.GuessGhc++usage :: IO ()+usage = do+  prog <- getProgName+  hPutStr stderr $ align "(" "|" ("Usage: " ++ prog ++ " " ++ usageMsg)+ where+   usageMsg = "\+\( print-appdatadir\n\+\| print-build-platform\n\+\| DIST_DIR ( print-exe | [CABAL_HELPER_ARGS...] ) )\n"++data Options = Options {+          ghcProgram    :: FilePath+        , ghcPkgProgram :: FilePath+        , cabalProgram  :: FilePath+}++defaultOptions :: Options+defaultOptions = Options "ghc" "ghc-pkg" "cabal"++globalArgSpec :: [OptDescr (Options -> Options)]+globalArgSpec =+      [ option "" ["with-ghc"] "GHC executable to use" $+              reqArg "PROG" $ \p o -> o { ghcProgram = p }++      , option "" ["with-ghc-pkg"] "ghc-pkg executable to use (only needed when guessing from GHC path fails)" $+              reqArg "PROG" $ \p o -> o { ghcPkgProgram = p }++      , option "" ["with-cabal"] "cabal-install executable to use" $+               reqArg "PROG" $ \p o -> o { cabalProgram = p }+      ]+ where+   option :: [Char] -> [String] -> String -> ArgDescr a -> OptDescr a+   option s l udsc dsc = Option s l dsc udsc++   reqArg :: String -> (String -> a) -> ArgDescr a+   reqArg udsc dsc = ReqArg dsc udsc++parseCommandArgs :: Options -> [String] -> (Options, [String])+parseCommandArgs opts argv+    = case getOpt Permute globalArgSpec argv of+        (o,r,[])   -> (foldr id opts o, r)+        (_,_,errs) ->+            panic $ "Parsing command options failed: " ++ concat errs++guessProgramPaths :: Options -> IO Options+guessProgramPaths opts = do+    if not (same ghcProgram opts dopts) && same ghcPkgProgram opts dopts+       then do+         mghcPkg <- guessToolFromGhcPath "ghc-pkg" (ghcProgram opts)+         return opts {+           ghcPkgProgram = fromMaybe (ghcPkgProgram opts) mghcPkg+         }+       else return opts+ where+   same f o o'  = f o == f o'+   dopts = defaultOptions++main :: IO ()+main = handlePanic $ do+  (opts', args) <- parseCommandArgs defaultOptions <$> getArgs+  opts <- guessProgramPaths opts'+  case args of+    [] -> usage+    "--help":[] -> usage+    "print-appdatadir":[] -> putStrLn =<< appDataDir+    "print-build-platform":[] -> putStrLn $ display buildPlatform+    distdir:args' -> do+      cfgf <- canonicalizePath (distdir </> "setup-config")+      mhdr <- getCabalConfigHeader cfgf+      case mhdr of+        Nothing -> panic $ printf "\+\Could not read Cabal's persistent setup configuration header\n\+\- Check first line of: %s\n\+\- Maybe try: $ cabal configure" cfgf++        Just (hdrCabalVersion, _hdrCompilerVersion) -> do+          eexe <- compileHelper opts hdrCabalVersion distdir+          case eexe of+              Left e -> exitWith e+              Right exe ->+                case args' of+                  "print-exe":_ -> putStrLn exe+                  _ -> do+                    (_,_,_,h) <- createProcess $ proc exe args+                    exitWith =<< waitForProcess h++appDataDir :: IO FilePath+appDataDir = (</> "cabal-helper") <$> getAppUserDataDirectory "ghc-mod"++compileHelper :: Options -> Version -> FilePath -> IO (Either ExitCode FilePath)+compileHelper opts cabalVer distdir = withHelperSources $ \chdir -> do+  run [ Right <$> MaybeT (cachedExe cabalVer)+      , compileGlobal chdir+      , cachedCabalPkg chdir+      , compileCabalSource chdir+      , MaybeT (Just <$> compileSandbox chdir)+      ]++ where+   run actions = fromJust <$> runMaybeT (msum actions)++   -- | Check if this version is globally available+   compileGlobal :: FilePath -> MaybeT IO (Either ExitCode FilePath)+   compileGlobal chdir = do+       _ <- MaybeT $ find (== cabalVer) <$> listCabalVersions opts+       liftIO $ compileWithPkg chdir Nothing++   -- | Check if we already compiled this version of cabal into a private+   -- package-db+   cachedCabalPkg :: FilePath -> MaybeT IO (Either ExitCode FilePath)+   cachedCabalPkg chdir = do+       db_exists <- liftIO $ cabalPkgDbExists opts cabalVer+       case db_exists of+         False -> mzero+         True -> liftIO $ do+             db <- cabalPkgDb opts cabalVer+             compileWithPkg chdir (Just db)++   -- | See if we're in a cabal source tree+   compileCabalSource :: FilePath -> MaybeT IO (Either ExitCode FilePath)+   compileCabalSource chdir = do+       let couldBeSrcDir = takeDirectory distdir+           cabalFile = couldBeSrcDir </> "Cabal.cabal"+       cabal <- liftIO $ doesFileExist cabalFile+       case cabal of+         False -> mzero+         True -> liftIO $ do+           ver <- cabalFileVersion <$> readFile cabalFile+           compileWithCabalTree chdir ver couldBeSrcDir++   -- | Compile the requested cabal version into an isolated package-db+   compileSandbox :: FilePath -> IO (Either ExitCode FilePath)+   compileSandbox chdir = do+       db <- installCabal opts cabalVer `E.catch`+             \(SomeException _) -> errorInstallCabal cabalVer+       compileWithPkg chdir (Just db)++   compileWithCabalTree chdir ver srcDir =+       compile opts $ Compile chdir (Just srcDir) Nothing ver []++   compileWithPkg chdir mdb =+       compile opts $ Compile chdir Nothing mdb cabalVer [cabalPkgId cabalVer]++   cabalPkgId v = "Cabal-" ++ showVersion v++-- errorNoCabal :: Version -> a+-- errorNoCabal cabalVer = panic $ printf "\+-- \No appropriate Cabal package found, wanted version %s.\n"+--  where+--    sver = showVersion cabalVer++errorInstallCabal :: Version -> a+errorInstallCabal cabalVer = panic $ printf "\+\Installing Cabal version %s failed.\n\+\n\+\You have two choices now:\n\+\- Either you install this version of Cabal in your globa/luser package-db\n\+\  somehow\n\+\n\+\- Or you can see if you can update your cabal-install to use a different\n\+\  version of the Cabal library that we can build with:\n\+\    $ cabal install cabal-install --constraint 'Cabal > %s'\n\+\n\+\To check the version cabal-install is currently using try:\n\+\    $ cabal --version\n" sver sver+ where+   sver = showVersion cabalVer++data Compile = Compile {+      cabalHelperSourceDir :: FilePath,+      cabalSourceDir :: Maybe FilePath,+      packageDb      :: Maybe FilePath,+      cabalVersion   :: Version,+      packageDeps    :: [String]+    }++compile :: Options -> Compile -> IO (Either ExitCode FilePath)+compile Options {..} Compile {..} = do+    outdir <- appDataDir+    createDirectoryIfMissing True outdir+    exe <- exePath cabalVersion++    let Version (mj:mi:_) _ = cabalVersion+    let ghc_opts =+             concat [+          [ "-outputdir", outdir+          , "-o", exe+          , "-optP-DCABAL_HELPER=1"+          , "-optP-DCABAL_MAJOR=" ++ show mj+          , "-optP-DCABAL_MINOR=" ++ show mi+          ],+          maybeToList $ ("-package-db="++) <$> packageDb,+          map ("-i"++) $ cabalHelperSourceDir:maybeToList cabalSourceDir,+          concatMap (\p -> ["-package", p]) packageDeps,+          [ "--make",  cabalHelperSourceDir </> "CabalHelper/Main.hs" ]+         ]++    -- TODO: touch exe after, ghc doesn't do that if the input files didn't+    -- actually change+    rv <- callProcessStderr' Nothing ghcProgram ghc_opts+    return $ case rv of+               ExitSuccess -> Right exe+               e@(ExitFailure _) -> Left e++exePath :: Version -> IO FilePath+exePath cabalVersion = do+    outdir <- appDataDir+    return $ outdir </> "cabal-helper-" ++ showVersion version -- our ver+                     ++ "-Cabal-" ++ showVersion cabalVersion++cachedExe :: Version -> IO (Maybe FilePath)+cachedExe cabalVersion = do+   exe <- exePath cabalVersion+   exists <- doesFileExist exe+   return $ if exists then Just exe else Nothing++callProcessStderr' :: Maybe FilePath -> FilePath -> [String] -> IO ExitCode+callProcessStderr' mwd exe args = do+  (_, _, _, h) <- createProcess (proc exe args) { std_out = UseHandle stderr+                                                , cwd = mwd }+  waitForProcess h++callProcessStderr :: Maybe FilePath -> FilePath -> [String] -> IO ()+callProcessStderr mwd exe args = do+  rv <- callProcessStderr' mwd exe args+  case rv of+    ExitSuccess -> return ()+    ExitFailure v -> processFailedException "callProcessStderr" exe args v++processFailedException :: String -> String -> [String] -> Int -> IO a+processFailedException fn exe args rv =+      panic $ concat [fn, ": ", exe, " "+                     , intercalate " " (map show args)+                     , " (exit " ++ show rv ++ ")"]++installCabal :: Options -> Version -> IO FilePath+installCabal opts ver = do+  appdir <- appDataDir+  hPutStr stderr $ printf "\+\cabal-helper-wrapper: Installing a private copy of Cabal, this might take a\n\+\while but will only happen once per Cabal version.\n\+\\n\+\If anything goes horribly wrong just delete this directory and try again:\n\+\    %s\n\+\\n\+\If you want to avoid this automatic installation altogether install version\n\+\%s of Cabal manually (into your user or global package-db):\n\+\    $ cabal install Cabal-%s\n\+\..." appdir (showVersion ver) (showVersion ver)++  db <- createPkgDb opts ver+  callProcessStderr (Just "/") (cabalProgram opts) $ concat+      [+        [ "--package-db=clear"+        , "--package-db=global"+        , "--package-db=" ++ db+        , "--prefix=" ++ db </> "prefix"+        , "-v0"+        , "--with-ghc=" ++ ghcProgram opts+        ]+        , if ghcPkgProgram opts /= ghcPkgProgram defaultOptions+            then [ "--with-ghc-pkg=" ++ ghcPkgProgram opts ]+            else []+        , [ "install", "Cabal-"++showVersion ver ]+      ]+  hPutStrLn stderr "Done"+  return db++ghcVersion :: Options -> IO Version+ghcVersion Options {..} = do+    parseVer . trim <$> readProcess ghcProgram ["--numeric-version"] ""++ghcPkgVersion :: Options -> IO Version+ghcPkgVersion Options {..} = do+    parseVer . trim <$> readProcess ghcPkgProgram ["--numeric-version"] ""++trim :: String -> String+trim = dropWhileEnd isSpace++createPkgDb :: Options -> Version -> IO FilePath+createPkgDb opts@Options {..} ver = do+  db <- cabalPkgDb opts ver+  exists <- doesDirectoryExist db+  when (not exists) $ callProcessStderr Nothing ghcPkgProgram ["init", db]+  return db++cabalPkgDb :: Options -> Version -> IO FilePath+cabalPkgDb opts ver = do+  appdir <- appDataDir+  ghcVer <- ghcVersion opts+  return $ appdir </> "Cabal-" ++ showVersion ver ++ "-db-" ++ showVersion ghcVer++cabalPkgDbExists :: Options -> Version -> IO Bool+cabalPkgDbExists opts ver = do+  db <- cabalPkgDb opts ver+  dexists <- doesDirectoryExist db+  case dexists of+    False -> return False+    True -> do+      vers <- listCabalVersions' opts (Just db)+      return $ ver `elem` vers++listCabalVersions :: Options -> IO [Version]+listCabalVersions opts = listCabalVersions' opts Nothing++-- TODO: Include sandbox? Probably only relevant for build-type:custom projects.+listCabalVersions' :: Options -> Maybe FilePath -> IO [Version]+listCabalVersions' Options {..} mdb = do+  let mdbopt = ("--package-db="++) <$> mdb+      opts = ["list", "--simple-output", "Cabal"] ++ maybeToList mdbopt++  catMaybes . map (fmap snd . parsePkgId . fromString) . words+          <$> readProcess ghcPkgProgram opts ""++-- | Find @version: XXX@ delcaration in a cabal file+cabalFileVersion :: String -> Version+cabalFileVersion cabalFile = do+  fromJust $ parseVer . extract <$> find ("version" `isPrefixOf`) ls+ where+  ls = map (map toLower) $ lines cabalFile+  extract = dropWhile (/=':') >>> dropWhile isSpace >>> takeWhile (not . isSpace)

+ Distribution/Helper.hs view

@@ -0,0 +1,285 @@+-- ghc-mod: Making Haskell development *more* fun+-- Copyright (C) 2015  Daniel Gröber <dxld ÄT darkboxed DOT org>+--+-- This program is free software: you can redistribute it and/or modify+-- it under the terms of the GNU Affero General Public License as published by+-- the Free Software Foundation, either version 3 of the License, or+-- (at your option) any later version.+--+-- This program is distributed in the hope that it will be useful,+-- but WITHOUT ANY WARRANTY; without even the implied warranty of+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the+-- GNU Affero General Public License for more details.+--+-- You should have received a copy of the GNU Affero General Public License+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.++{-# LANGUAGE CPP, FlexibleContexts, ConstraintKinds, DeriveDataTypeable #-}+module Distribution.Helper (+    Programs(..)++  -- * Running Queries+  , Query+  , runQuery+  , runKQuery+  , runKQuery_++  -- * Queries against Cabal\'s on disk state++  , entrypoints+  , sourceDirs+  , ghcOptions+  , ghcSrcOptions+  , ghcPkgOptions++  -- * Managing @dist/@+  , reconfigure+  , writeAutogenFiles++  -- * $libexec related error handling+  , LibexecNotFoundError(..)+  , libexecNotFoundError+  ) where++import Control.Applicative+import Control.Arrow+import Control.Monad+import Control.Monad.IO.Class+import Control.Monad.State.Strict+import Control.Monad.Reader+import Control.Exception as E+import Data.Monoid+import Data.List+import Data.Default+import Data.Typeable+import System.Environment+import System.FilePath+import System.Directory+import System.Process+import Text.Printf++import Paths_cabal_helper (getLibexecDir)+import CabalHelper.Types++-- | Paths or names of various programs we need.+data Programs = Programs {+      cabalProgram  :: FilePath,+      ghcProgram    :: FilePath,+      ghcPkgProgram :: FilePath+    }++instance Default Programs where+    def = Programs "cabal" "ghc" "ghc-pkg"++data SomeLocalBuildInfo = SomeLocalBuildInfo {+      slbiEntrypoints   :: [(ChComponentName, ChEntrypoint)],+      slbiSourceDirs    :: [(ChComponentName, [String])],+      slbiGhcOptions    :: [(ChComponentName, [String])],+      slbiGhcSrcOptions :: [(ChComponentName, [String])],+      slbiGhcPkgOptions :: [(ChComponentName, [String])]+    } deriving (Eq, Ord, Read, Show)++-- | Caches helper executable result so it doesn't have to be run more than once+-- as reading in Cabal's @LocalBuildInfo@ datatype from disk is very slow but+-- running all possible queries against it at once is cheap.+newtype Query m a = Query { unQuery :: StateT (Maybe SomeLocalBuildInfo)+                                         (ReaderT (Programs, FilePath) m) a }++type MonadQuery m = ( MonadIO m+                    , MonadState (Maybe SomeLocalBuildInfo) m+                    , MonadReader (Programs, FilePath) m)++run r s action = flip runReaderT r (flip evalStateT s (unQuery action))++-- | @runQuery query distdir@. Run a 'Query'. @distdir@ is where Cabal's+-- @setup-config@ file is located.+runQuery :: Monad m+         => Query m a+         -> FilePath -- ^ Path to @dist/@+         -> m a+runQuery action fp = run (def, fp) Nothing action++-- | Run a 'Query' as an Arrow by wrapping it in a 'Kleisli' constructor.+runKQuery :: Monad m+          => Kleisli (Query m) a b+          -> FilePath -- ^ Path to @dist/@+          -> a+          -> m b+runKQuery (Kleisli action) fp a = run (def, fp) Nothing (action a)++-- | Same as 'runKQuery' but pass unit as input to the arrow.+runKQuery_ :: Monad m+           => Kleisli (Query m) () b+           -> FilePath -- ^ Path to @dist/@+           -> m b+runKQuery_ (Kleisli action) fp = run (def, fp) Nothing (action ())++getSlbi :: MonadQuery m => m SomeLocalBuildInfo+getSlbi = do+  s <- get+  case s of+    Nothing -> do+            slbi <- getSomeConfigState+            put (Just slbi)+            return slbi+    Just slbi -> return slbi++-- | Modules or files Cabal would have the compiler build directly. Can be used+-- to compute the home module closure for a component.+entrypoints   :: MonadIO m => Query m [(ChComponentName, ChEntrypoint)]++-- | A component's @source-dirs@ field, beware as if this is empty implicit+-- behaviour in GHC kicks in.+sourceDirs    :: MonadIO m => Query m [(ChComponentName, [FilePath])]++-- | All options cabal would pass to GHC.+ghcOptions    :: MonadIO m => Query m [(ChComponentName, [String])]++-- | Only search path related GHC options.+ghcSrcOptions :: MonadIO m => Query m [(ChComponentName, [String])]++-- | Only package related GHC options, sufficient for things don't need to+-- access any home modules.+ghcPkgOptions :: MonadIO m => Query m [(ChComponentName, [String])]++entrypoints   = Query $ slbiEntrypoints   `liftM` getSlbi+sourceDirs    = Query $ slbiSourceDirs    `liftM` getSlbi+ghcOptions    = Query $ slbiGhcOptions    `liftM` getSlbi+ghcSrcOptions = Query $ slbiGhcSrcOptions `liftM` getSlbi+ghcPkgOptions = Query $ slbiGhcPkgOptions `liftM` getSlbi++-- | Run @cabal configure@+reconfigure :: MonadIO m+            => Programs -- ^ Program paths+            -> [String] -- ^ Command line arguments to be passed to @cabal@+            -> m ()+reconfigure progs cabalOpts = do+    let progOpts =+            [ "--with-ghc=" ++ ghcProgram progs ]+            -- Only pass ghc-pkg if it was actually set otherwise we+            -- might break cabal's guessing logic+            ++ if ghcPkgProgram progs /= ghcPkgProgram def+                 then [ "--with-ghc-pkg=" ++ ghcPkgProgram progs ]+                 else []+            ++ cabalOpts+    _ <- liftIO $ readProcess (cabalProgram progs) ("configure":progOpts) ""+    return ()++getSomeConfigState :: MonadQuery m => m SomeLocalBuildInfo+getSomeConfigState = ask >>= \(progs, distdir) -> do+  let progArgs = [ "--with-ghc="     ++ ghcProgram progs+                 , "--with-ghc-pkg=" ++ ghcPkgProgram progs+                 , "--with-cabal="   ++ cabalProgram progs+                 ]++  let args = [ "entrypoints"+             , "source-dirs"+             , "ghc-options"+             , "ghc-src-options"+             , "ghc-pkg-options"+             ] ++ progArgs++  res <- liftIO $ do+    exe  <- findLibexecExe "cabal-helper-wrapper"+    out <- readProcess exe (distdir:args) ""+    evaluate (read out) `E.catch` \(SomeException _) ->+      error $ concat ["getSomeConfigState", ": ", exe, " "+                     , intercalate " " (map show $ distdir:args)+                     , " (read failed)"]++  let [ Just (ResponseEntrypoints eps),+        Just (ResponseStrings srcDirs),+        Just (ResponseStrings ghcOpts),+        Just (ResponseStrings ghcSrcOpts),+        Just (ResponseStrings ghcPkgOpts) ] = res++  return $ SomeLocalBuildInfo eps srcDirs ghcOpts ghcSrcOpts ghcPkgOpts++-- | Create @cabal_macros.h@ and @Paths_\<pkg\>@ possibly other generated files+-- in the usual place.+writeAutogenFiles :: MonadIO m+                  => FilePath -- ^ Path to the @dist/@ directory+                  -> m ()+writeAutogenFiles distdir = liftIO $ do+  exe  <- findLibexecExe "cabal-helper-wrapper"+  callProcess' exe [distdir, "write-autogen-files"]++-- | This exception is thrown by all 'runQuery' functions if the internal+-- wrapper executable cannot be found. You may catch this and present the user+-- an appropriate error message however the default is to print+-- 'libexecNotFoundError'.+data LibexecNotFoundError = LibexecNotFoundError String FilePath+                          deriving (Typeable)+instance Exception LibexecNotFoundError+instance Show LibexecNotFoundError where+  show (LibexecNotFoundError exe dir) =+    libexecNotFoundError exe dir "https://github.com/DanielG/cabal-helper/issues"++findLibexecExe :: String -> IO FilePath+findLibexecExe "cabal-helper-wrapper" = do+    libexecdir <- getLibexecDir+    let exeName = "cabal-helper-wrapper"+        exe = libexecdir </> exeName++    exists <- doesFileExist exe++    if exists+       then return exe+       else do+         mdir <- tryFindCabalHelperTreeLibexecDir+         case mdir of+           Nothing ->+               error $ throw $ LibexecNotFoundError exeName libexecdir+           Just dir ->+               return $ dir </> "dist" </> "build" </> exeName </> exeName+findLibexecExe exe = error $ "findLibexecExe: Unknown executable: " ++ exe++tryFindCabalHelperTreeLibexecDir :: IO (Maybe FilePath)+tryFindCabalHelperTreeLibexecDir = do+  exe <- getExecutablePath'+  dir <- case takeFileName exe of+    "ghc" -> do -- we're probably in ghci; try CWD+        getCurrentDirectory+    _ ->+        return $ (!!4) $ iterate takeDirectory exe+  exists <- doesFileExist $ dir </> "cabal-helper.cabal"+  return $ if exists+             then Just dir+             else Nothing++libexecNotFoundError :: String   -- ^ Name of the executable we were trying to+                                 -- find+                     -> FilePath -- ^ Path to @$libexecdir@+                     -> String   -- ^ URL the user will be directed towards to+                                 -- report a bug.+                     -> String+libexecNotFoundError exe dir reportBug = printf+ ( "Could not find $libexecdir/%s\n"+ ++"\n"+ ++"If you are a developer set the environment variable\n"+ ++"`cabal_helper_libexecdir' to override $libexecdir[1]. The following will\n"+ ++"work in the cabal-helper source tree:\n"+ ++"\n"+ ++"    $ export cabal_helper_libexecdir=$PWD/dist/build/%s\n"+ ++"\n"+ ++"[1]: %s\n"+ ++"\n"+ ++"If you don't know what I'm talking about something went wrong with your\n"+ ++"installation. Please report this problem here:\n"+ ++"\n"+ ++"    %s") exe exe dir reportBug++getExecutablePath' :: IO FilePath+getExecutablePath' =+#if MIN_VERSION_base(4,6,0)+    getExecutablePath+#else+    getProgName+#endif++callProcess' exe args =+#if MIN_VERSION_process(1,2,0)+    callProcess exe args+#else+    void $ readProcess exe args ""+#endif

+ LICENSE view

@@ -0,0 +1,661 @@+                    GNU AFFERO GENERAL PUBLIC LICENSE+                       Version 3, 19 November 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++                            Preamble++  The GNU Affero General Public License is a free, copyleft license for+software and other kinds of works, specifically designed to ensure+cooperation with the community in the case of network server software.++  The licenses for most software and other practical works are designed+to take away your freedom to share and change the works.  By contrast,+our General Public Licenses are intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users.++  When we speak of free software, we are referring to freedom, not+price.  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+ Setup.hs view

@@ -0,0 +1,70 @@+#!/usr/bin/env runhaskell+{-# LANGUAGE RecordWildCards #-}+import Distribution.Simple+import Distribution.Simple.Setup+import Distribution.Simple.Install+import Distribution.Simple.InstallDirs as ID+import Distribution.Simple.LocalBuildInfo+import Distribution.PackageDescription++import Control.Applicative+import Data.List+import Data.Maybe+import System.FilePath++main :: IO ()+main = defaultMainWithHooks $ simpleUserHooks { copyHook = xInstallTargetHook }++xInstallTargetHook ::+    PackageDescription -> LocalBuildInfo -> UserHooks -> CopyFlags -> IO ()+xInstallTargetHook pd lbi _uh cf = do+  let (extended, regular) = partition (isJust . installTarget) (executables pd)++  let pd_regular = pd { executables = regular }++  _ <- flip mapM extended $ \exe -> do+    putStrLn $ "extended "  ++ show (exeName exe)++    let+        idirtpl          = installDirTemplates lbi+        env              = installDirsTemplateEnv idirtpl+        libexecdir'      = fromPathTemplate (libexecdir idirtpl)++        pd_extended      = onlyExePackageDesc [exe] pd+        install_target   = fromJust $ installTarget exe+        install_target'  = ID.substPathTemplate env install_target+        -- $libexec isn't a real thing :/ so we have to simulate it+        install_target'' = substLibExec' libexecdir' install_target'++    let lbi' = lbi {+                 installDirTemplates =+                     (installDirTemplates lbi) {+                   bindir = install_target''+                 }+               }++    install pd_extended lbi' cf++  install pd_regular lbi cf++ where+   installTarget :: Executable -> Maybe PathTemplate+   installTarget exe =+    toPathTemplate <$> lookup "x-install-target" (customFieldsBI $ buildInfo exe)++   substLibExec libexecdir "$libexecdir" = libexecdir+   substLibExec _ comp = comp++   substLibExec' dir =+       withPT $+           withSP $ map (substLibExec dir . dropTrailingPathSeparator)+++   withPT f pt = toPathTemplate $ f (fromPathTemplate pt)+   withSP f p  = joinPath $ f (splitPath p)++onlyExePackageDesc :: [Executable] -> PackageDescription -> PackageDescription+onlyExePackageDesc exes pd = emptyPackageDescription {+                     package = package pd+                   , executables = exes+                   }

+ cabal-helper.cabal view

@@ -0,0 +1,67 @@+name:                cabal-helper+version:             0.1.0.0+synopsis:            Simple interface to Cabal's configuration state used by ghc-mod+description:+    @cabal-helper@ provides a library which wraps the internal use of executables+    to lift the restrictions imposed by linking against versions of GHC before+    @7.10@.++    @cabal-helper@ uses a wrapper executable to compile the actual cabal-helper+    executable at runtime while linking against an arbitrary version of+    Cabal. This runtime-compiled helper executable is then used to extract+    various bits and peices from Cabal on disk state (dist/setup-config) written+    by it's configure command.++    In addition to this the wrapper executable also supports installing any+    version of Cabal from hackage in case it cannot be found in any available+    package database. The wrapper installs these instances of the Cabal library+    into a private package database so as to not interfere with the user's+    packages.++    Furthermore the wrapper supports one special case namely reading a state+    file for Cabal itself. This is needed as Cabal compiles it's Setup.hs using+    itself and not using any version of Cabal installed in any package database.++    Currently @cabal-helper@ supports @Cabal >= 1.16@.++license:             AGPL-3+license-file:        LICENSE+author:              Daniel Gröber <dxld@darkboxed.org>+maintainer:          dxld@darkboxed.org+category:            Distribution+build-type:          Simple+cabal-version:       >=1.10++source-repository head+  type:     git+  location: https://github.com/DanielG/cabal-helper.git++library+  exposed-modules:     Distribution.Helper+  build-depends:       base >= 4.5 && < 5+  default-language:    Haskell2010+  Build-Depends:       base+                     , data-default+                     , directory+                     , filepath+                     , transformers+                     , mtl+                     , process+++Executable cabal-helper-wrapper+  Default-Language:    Haskell2010+  Other-Extensions:    TemplateHaskell+  Main-Is:             CabalHelper/Wrapper.hs+  Other-Modules:       Paths_cabal_helper+  GHC-Options:         -Wall+  X-Install-Target:    $libexecdir+  Build-Depends:       base >= 4.5 && < 5+                     , bytestring+                     , Cabal+                     , directory+                     , filepath+                     , process+                     , transformers+                     , template-haskell+                     , temporary