159 lines
5.7 KiB
Haskell
159 lines
5.7 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Language.Haskell.GhcMod.CabalApi (
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fromCabalFile
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, parseCabalFile
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, cabalAllBuildInfo
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, cabalDependPackages
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, cabalSourceDirs
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, getGHCVersion
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) where
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import Control.Applicative ((<$>))
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import Control.Exception (throwIO)
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import Data.List (intercalate)
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import Data.Maybe (maybeToList)
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import Data.Set (fromList, toList)
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import Distribution.Package (Dependency(Dependency)
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, PackageName(PackageName)
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, PackageIdentifier(pkgName))
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import Distribution.PackageDescription
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import Distribution.PackageDescription.Configuration (finalizePackageDescription)
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import Distribution.PackageDescription.Parse (readPackageDescription)
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import Distribution.Simple.Compiler (CompilerId(..), CompilerFlavor(..))
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import Distribution.Simple.Program (ghcProgram)
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import Distribution.Simple.Program.Types (programName, programFindVersion)
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import Distribution.System (buildPlatform)
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import Distribution.Text (display)
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import Distribution.Verbosity (silent)
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import Distribution.Version (versionBranch, Version)
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import Language.Haskell.GhcMod.Types
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import System.FilePath
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----------------------------------------------------------------
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-- | Parsing a cabal file in 'Cradle' and returns
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-- options for GHC, include directories for modules and
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-- package names of dependency.
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fromCabalFile :: [GHCOption]
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-> Cradle
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-> IO ([GHCOption],[IncludeDir],[Package])
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fromCabalFile ghcOptions cradle = do
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cabal <- parseCabalFile cfile
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return $ cookInfo ghcOptions cradle cabal
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where
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Just cfile = cradleCabalFile cradle
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cookInfo :: [String] -> Cradle -> PackageDescription
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-> ([GHCOption],[IncludeDir],[Package])
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cookInfo ghcOptions cradle cabal = (gopts,idirs,depPkgs)
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where
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wdir = cradleCurrentDir cradle
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Just cdir = cradleCabalDir cradle
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Just cfile = cradleCabalFile cradle
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buildInfos = cabalAllBuildInfo cabal
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gopts = getGHCOptions ghcOptions $ head buildInfos
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idirs = includeDirectories cdir wdir $ cabalSourceDirs buildInfos
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depPkgs = removeThem problematicPackages $ removeMe cfile $ cabalDependPackages buildInfos
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removeMe :: FilePath -> [String] -> [String]
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removeMe cabalfile = filter (/= me)
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where
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me = dropExtension $ takeFileName cabalfile
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removeThem :: [String] -> [String] -> [String]
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removeThem badpkgs = filter (`notElem` badpkgs)
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problematicPackages :: [String]
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problematicPackages = [
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"base-compat" -- providing "Prelude"
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]
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includeDirectories :: String -> String -> [FilePath] -> [String]
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includeDirectories cdir wdir [] = uniqueAndSort [cdir,wdir]
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includeDirectories cdir wdir dirs = uniqueAndSort (map (cdir </>) dirs ++ [cdir,wdir])
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----------------------------------------------------------------
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-- | Parsing a cabal file and returns 'PackageDescription'.
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-- 'IOException' is thrown if parsing fails.
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parseCabalFile :: FilePath -> IO PackageDescription
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parseCabalFile file = do
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cid <- getGHCId
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epgd <- readPackageDescription silent file
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case toPkgDesc cid epgd of
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Left deps -> throwIO $ userError $ show deps ++ " are not installed"
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Right (pd,_) -> if nullPkg pd
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then throwIO $ userError $ file ++ " is broken"
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else return pd
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where
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toPkgDesc cid = finalizePackageDescription [] (const True) buildPlatform cid []
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nullPkg pd = name == ""
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where
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PackageName name = pkgName (package pd)
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----------------------------------------------------------------
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getGHCOptions :: [String] -> BuildInfo -> [String]
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getGHCOptions ghcOptions binfo = ghcOptions ++ exts ++ [lang] ++ libs ++ libDirs
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where
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exts = map (("-X" ++) . display) $ usedExtensions binfo
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lang = maybe "-XHaskell98" (("-X" ++) . display) $ defaultLanguage binfo
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libs = map ("-l" ++) $ extraLibs binfo
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libDirs = map ("-L" ++) $ extraLibDirs binfo
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----------------------------------------------------------------
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-- | Extracting all 'BuildInfo' for libraries, executables, tests and benchmarks.
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cabalAllBuildInfo :: PackageDescription -> [BuildInfo]
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cabalAllBuildInfo pd = libBI ++ execBI ++ testBI ++ benchBI
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where
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libBI = map libBuildInfo $ maybeToList $ library pd
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execBI = map buildInfo $ executables pd
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testBI = map testBuildInfo $ testSuites pd
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benchBI = map benchmarkBuildInfo $ benchmarks pd
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----------------------------------------------------------------
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-- | Extracting package names of dependency.
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cabalDependPackages :: [BuildInfo] -> [Package]
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cabalDependPackages bis = uniqueAndSort $ pkgs
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where
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pkgs = map getDependencyPackageName $ concatMap targetBuildDepends bis
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getDependencyPackageName (Dependency (PackageName nm) _) = nm
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----------------------------------------------------------------
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-- | Extracting include directories for modules.
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cabalSourceDirs :: [BuildInfo] -> [IncludeDir]
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cabalSourceDirs bis = uniqueAndSort $ concatMap hsSourceDirs bis
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----------------------------------------------------------------
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uniqueAndSort :: [String] -> [String]
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uniqueAndSort = toList . fromList
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----------------------------------------------------------------
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-- | Getting GHC version. 7.6.3 becames 706 in the second of the result.
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getGHCVersion :: IO (GHCVersion, Int)
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getGHCVersion = toTupple <$> getGHC
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where
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toTupple v
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| length vs < 2 = (verstr, 0)
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| otherwise = (verstr, ver)
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where
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vs = versionBranch v
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ver = (vs !! 0) * 100 + (vs !! 1)
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verstr = intercalate "." . map show $ vs
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getGHCId :: IO CompilerId
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getGHCId = CompilerId GHC <$> getGHC
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getGHC :: IO Version
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getGHC = do
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mv <- programFindVersion ghcProgram silent (programName ghcProgram)
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case mv of
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Nothing -> throwIO $ userError "ghc not found"
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Just v -> return $ v
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