Distribution.PreProcess

:: PackageDescription
-> LocalBuildInfo
-> Int	verbose
-> [PPSuffixHandler]	preprocessors to try
-> IO ()
Apply preprocessors to the sources from `hsSourceDirs`, to obtain a Haskell source file for each module.

knownSuffixHandlers :: [PPSuffixHandler]

Standard preprocessors: GreenCard, c2hs, hsc2hs, happy, alex and cpphs.

ppSuffixes :: [PPSuffixHandler] -> [String]

Convenience function; get the suffixes of these preprocessors.

type PPSuffixHandler = (String, BuildInfo -> LocalBuildInfo -> PreProcessor)

A preprocessor for turning non-Haskell files with the given extension into plain Haskell source files.

type PreProcessor = FilePath -> FilePath -> Int -> IO ExitCode

The interface to a preprocessor, which may be implemented using an external program, but need not be. The arguments are the name of the input file, the name of the output file and a verbosity level. Here is a simple example that merely prepends a comment to the given source file:

 ppTestHandler :: PreProcessor
 ppTestHandler inFile outFile verbose
     = do when (verbose > 0) $
            putStrLn (inFile++" has been preprocessed to "++outFile)
          stuff <- readFile inFile
          writeFile outFile ("-- preprocessed as a test\n\n" ++ stuff)
          return ExitSuccess

removePreprocessed

:: [FilePath]	search Location
-> [String]	Modules
-> [String]	suffixes
-> IO ()
Remove the preprocessed .hs files. (do we need to get some .lhs files too?)

removePreprocessedPackage

:: PackageDescription
-> FilePath	root of source tree (where to look for hsSources)
-> [String]	suffixes
-> IO ()

ppCpp :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppCpp' :: [String] -> BuildInfo -> LocalBuildInfo -> PreProcessor

ppGreenCard :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppC2hs :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppHsc2hs :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppHappy :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppAlex :: BuildInfo -> LocalBuildInfo -> PreProcessor

ppUnlit :: PreProcessor

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