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Copyright (C) 2006-2015 John MacFarlane <>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import Distribution.Simple
import Distribution.Simple.PreProcess
import Distribution.Simple.Setup (ConfigFlags(..))
import Distribution.PackageDescription (PackageDescription(..), FlagName(..))
import System.Process ( rawSystem )
import System.FilePath ( (</>) )
import System.Directory ( findExecutable )
import Distribution.Verbosity ( Verbosity )
import Distribution.Simple.Utils (info, notice, installOrdinaryFiles)
import Distribution.Simple.Setup
import Distribution.Simple.Program (simpleProgram, Program(..))
import Distribution.Simple.LocalBuildInfo
import Data.Version
import System.Process (readProcess)
import Text.ParserCombinators.ReadP (readP_to_S, skipSpaces, eof)
import Control.Monad (when)
import qualified Control.Exception as E
main :: IO ()
main = defaultMainWithHooks $ simpleUserHooks {
-- enable hsb2hs preprocessor for .hsb files
hookedPreProcessors = [ppBlobSuffixHandler]
, hookedPrograms = [(simpleProgram "hsb2hs"){
programFindVersion = findHsb2hsVersion }]
, postCopy = installManPage
findHsb2hsVersion :: Verbosity -> FilePath -> IO (Maybe Version)
findHsb2hsVersion verb fp = do
let handleExitFailure :: IOError -> IO (Maybe Version)
handleExitFailure _ = return Nothing
E.handle handleExitFailure $ do
outp <- readProcess fp ["--version"] ""
case readP_to_S (do v <- parseVersion
return v) outp of
((v,""):_) -> return (Just v)
_ -> return Nothing
ppBlobSuffixHandler :: PPSuffixHandler
ppBlobSuffixHandler = ("hsb", \_ lbi ->
PreProcessor {
platformIndependent = True,
runPreProcessor = mkSimplePreProcessor $ \infile outfile verbosity ->
do let embedData = case lookup (FlagName "embed_data_files")
(configConfigurationsFlags (configFlags lbi)) of
Just True -> True
_ -> False
when embedData $
do info verbosity $ "Preprocessing " ++ infile ++ " to " ++ outfile
hsb2hsPath <- findExecutable "hsb2hs"
case hsb2hsPath of
Just p -> rawSystem p [infile, infile, outfile]
Nothing -> error "hsb2hs is needed to build this program: cabal install hsb2hs"
return ()
installManPage :: Args -> CopyFlags
-> PackageDescription -> LocalBuildInfo -> IO ()
installManPage _ flags pkg lbi = do
let verbosity = fromFlag (copyVerbosity flags)
let copydest = fromFlag (copyDest flags)
let mandest = mandir (absoluteInstallDirs pkg lbi copydest)
</> "man1"
notice verbosity $ "Copying man page to " ++ mandest
installOrdinaryFiles verbosity mandest [("man", "pandoc.1")]
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