100 lines
4.5 KiB
Diff
100 lines
4.5 KiB
Diff
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diff --git a/Cabal/Distribution/Simple/Build/PathsModule.hs b/Cabal/Distribution/Simple/Build/PathsModule.hs
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index 5e660e8d6..1ae603c94 100644
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--- a/libraries/Cabal/Cabal/Distribution/Simple/Build/PathsModule.hs
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+++ b/libraries/Cabal/Cabal/Distribution/Simple/Build/PathsModule.hs
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@@ -37,6 +37,9 @@ import System.FilePath ( pathSeparator )
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-- * Building Paths_<pkg>.hs
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-- ------------------------------------------------------------
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+splitPath :: FilePath -> [ String ]
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+splitPath = unintersperse pathSeparator
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+
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generatePathsModule :: PackageDescription -> LocalBuildInfo -> ComponentLocalBuildInfo -> String
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generatePathsModule pkg_descr lbi clbi =
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let pragmas =
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@@ -78,12 +81,44 @@ generatePathsModule pkg_descr lbi clbi =
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"import System.Environment (getExecutablePath)\n"
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| otherwise = ""
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+ dirs = [ (flat_libdir, "LibDir")
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+ , (flat_dynlibdir, "DynLibDir")
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+ , (flat_datadir, "DataDir")
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+ , (flat_libexecdir, "LibexecDir")
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+ , (flat_sysconfdir, "SysconfDir") ];
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+
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+ shouldEmitPath p
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+ | (splitPath flat_prefix) `isPrefixOf` (splitPath flat_bindir) = True
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+ | (splitPath flat_prefix) `isPrefixOf` (splitPath p) = False
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+ | otherwise = True
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+
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+ shouldEmitDataDir = shouldEmitPath flat_datadir
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+
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+ nixEmitPathFn (path, name) = let
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+ varName = toLower <$> name
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+ fnName = "get"++name
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+ in if shouldEmitPath path then
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+ varName ++ " :: FilePath\n"++
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+ varName ++ " = " ++ show path ++
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+ "\n" ++ fnName ++ " :: IO FilePath" ++
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+ "\n" ++ fnName ++ " = " ++ mkGetEnvOr varName ("return " ++ varName)++"\n"
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+ else ""
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+
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+ absBody = intercalate "\n" $ nixEmitPathFn <$> dirs
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+
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+ warnPragma = case filter (not . shouldEmitPath . fst) dirs of
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+ [] -> ""
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+ omittedDirs -> "{-# WARNING \"The functions: "++omittedFns++" Have been omitted by the Nix build system.\" #-}"
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+ where omittedFns = intercalate ", " $ map snd omittedDirs
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+
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+ importList = intercalate ", " $ ("get" ++) . snd <$> filter (shouldEmitPath . fst) dirs
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+
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header =
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pragmas++
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- "module " ++ prettyShow paths_modulename ++ " (\n"++
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- " version,\n"++
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- " getBinDir, getLibDir, getDynLibDir, getDataDir, getLibexecDir,\n"++
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- " getDataFileName, getSysconfDir\n"++
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+ "module " ++ prettyShow paths_modulename ++ " " ++ warnPragma ++ " (\n"++
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+ " version, getBinDir,\n"++
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+ (if shouldEmitDataDir then " getDataFileName, \n" else "\n")++
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+ " " ++ importList ++"\n"++
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" ) where\n"++
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"\n"++
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foreign_imports++
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@@ -136,26 +171,18 @@ generatePathsModule pkg_descr lbi clbi =
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"\n"++
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filename_stuff
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| absolute =
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- "\nbindir, libdir, dynlibdir, datadir, libexecdir, sysconfdir :: FilePath\n"++
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+ "\nbindir :: FilePath\n"++
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"\nbindir = " ++ show flat_bindir ++
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- "\nlibdir = " ++ show flat_libdir ++
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- "\ndynlibdir = " ++ show flat_dynlibdir ++
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- "\ndatadir = " ++ show flat_datadir ++
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- "\nlibexecdir = " ++ show flat_libexecdir ++
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- "\nsysconfdir = " ++ show flat_sysconfdir ++
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"\n"++
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- "\ngetBinDir, getLibDir, getDynLibDir, getDataDir, getLibexecDir, getSysconfDir :: IO FilePath\n"++
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+ "\ngetBinDir :: IO FilePath\n"++
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"getBinDir = "++mkGetEnvOr "bindir" "return bindir"++"\n"++
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- "getLibDir = "++mkGetEnvOr "libdir" "return libdir"++"\n"++
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- "getDynLibDir = "++mkGetEnvOr "dynlibdir" "return dynlibdir"++"\n"++
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- "getDataDir = "++mkGetEnvOr "datadir" "return datadir"++"\n"++
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- "getLibexecDir = "++mkGetEnvOr "libexecdir" "return libexecdir"++"\n"++
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- "getSysconfDir = "++mkGetEnvOr "sysconfdir" "return sysconfdir"++"\n"++
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- "\n"++
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- "getDataFileName :: FilePath -> IO FilePath\n"++
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- "getDataFileName name = do\n"++
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- " dir <- getDataDir\n"++
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- " return (dir ++ "++path_sep++" ++ name)\n"
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+ absBody ++ "\n"++
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+ (if shouldEmitDataDir then
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+ "getDataFileName :: FilePath -> IO FilePath\n"++
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+ "getDataFileName name = do\n"++
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+ " dir <- getDataDir\n"++
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+ " return (dir ++ "++path_sep++" ++ name)\n"
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+ else "\n")
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| otherwise =
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"\nprefix, bindirrel :: FilePath" ++
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"\nprefix = " ++ show flat_prefix ++
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