Cabal/src/Distribution/Simple/Build/Macros.hs

   1 -----------------------------------------------------------------------------
   2
   3 -- |
   4 -- Module      :  Distribution.Simple.Build.Macros
   5 -- Copyright   :  Simon Marlow 2008
   6 --
   7 -- Maintainer  :  cabal-devel@haskell.org
   8 -- Portability :  portable
   9 --
  10 -- Generate cabal_macros.h - CPP macros for package version testing
  11 --
  12 -- When using CPP you get
  13 --
  14 -- > VERSION_<package>
  15 -- > MIN_VERSION_<package>(A,B,C)
  16 --
  17 -- for each /package/ in @build-depends@, which is true if the version of
  18 -- /package/ in use is @>= A.B.C@, using the normal ordering on version
  19 -- numbers.
  20 --
  21 -- TODO Figure out what to do about backpack and internal libraries. It is very
  22 -- suspicious that this stuff works with munged package identifiers
  23 module Distribution.Simple.Build.Macros
  24   ( generateCabalMacrosHeader
  25   , generatePackageVersionMacros
  26   ) where
  27
  28 import Distribution.Compat.Prelude
  29 import Prelude ()
  30
  31 import Distribution.PackageDescription
  32 import Distribution.Pretty
  33 import Distribution.Simple.LocalBuildInfo
  34 import Distribution.Simple.Program.Db
  35 import Distribution.Simple.Program.Types
  36 import Distribution.Types.MungedPackageId
  37 import Distribution.Types.MungedPackageName
  38 import Distribution.Version
  39
  40 import qualified Distribution.Simple.Build.Macros.Z as Z
  41
  42 -- | The contents of the @cabal_macros.h@ for the given configured package.
  43 generateCabalMacrosHeader :: PackageDescription -> LocalBuildInfo -> ComponentLocalBuildInfo -> String
  44 generateCabalMacrosHeader pkg_descr lbi clbi =
  45   Z.render
  46     Z.Z
  47       { Z.zPackages = map mkZPackage $ package pkg_descr : map getPid (componentPackageDeps clbi)
  48       , Z.zTools =
  49           [ Z.ZTool
  50             { Z.ztoolName = programId prog
  51             , Z.ztoolVersion = ver
  52             , Z.ztoolX = major1
  53             , Z.ztoolY = major2
  54             , Z.ztoolZ = minor
  55             }
  56           | prog <- configuredPrograms $ withPrograms lbi
  57           , ver <- maybeToList (programVersion prog)
  58           , let (major1, major2, minor) = majorMinor ver
  59           ]
  60       , Z.zPackageKey = case clbi of
  61           LibComponentLocalBuildInfo{} -> componentCompatPackageKey clbi
  62           _ -> ""
  63       , Z.zComponentId = prettyShow (componentComponentId clbi)
  64       , Z.zPackageVersion = pkgVersion (package pkg_descr)
  65       , Z.zNotNull = not . null
  66       , Z.zManglePkgName = map fixchar . unPackageName
  67       , Z.zMangleStr = map fixchar
  68       }
  69   where
  70     getPid (_, MungedPackageId (MungedPackageName pn _) v) =
  71       -- NB: Drop the library name! We're just reporting package versions.
  72       -- This would have to be revisited if you are allowed to depend
  73       -- on different versions of the same package
  74       PackageIdentifier pn v
  75
  76 -- | Helper function that generates just the @VERSION_pkg@ and @MIN_VERSION_pkg@
  77 -- macros for a list of package ids (usually used with the specific deps of
  78 -- a configured package).
  79 generatePackageVersionMacros :: Version -> [PackageId] -> String
  80 generatePackageVersionMacros ver pkgids =
  81   Z.render
  82     Z.Z
  83       { Z.zPackages = map mkZPackage pkgids
  84       , Z.zTools = []
  85       , Z.zPackageKey = ""
  86       , Z.zComponentId = ""
  87       , Z.zPackageVersion = ver
  88       , Z.zNotNull = not . null
  89       , Z.zManglePkgName = map fixchar . unPackageName
  90       , Z.zMangleStr = map fixchar
  91       }
  92
  93 mkZPackage :: PackageId -> Z.ZPackage
  94 mkZPackage (PackageIdentifier name ver) =
  95   Z.ZPackage
  96     { Z.zpkgName = name
  97     , Z.zpkgVersion = ver
  98     , Z.zpkgX = major1
  99     , Z.zpkgY = major2
 100     , Z.zpkgZ = minor
 101     }
 102   where
 103     (major1, major2, minor) = majorMinor ver
 104
 105 majorMinor :: Version -> (String, String, String)
 106 majorMinor ver = case map show (versionNumbers ver) of
 107   [] -> ("0", "0", "0")
 108   [x] -> (x, "0", "0")
 109   [x, y] -> (x, y, "0")
 110   (x : y : z : _) -> (x, y, z)
 111
 112 fixchar :: Char -> Char
 113 fixchar '-' = '_'
 114 fixchar c = c