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{-
Copyright (C) 2006-2014 John MacFarlane <jgm@berkeley.edu>

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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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.PackageDescription (PackageDescription(..), Executable(..))
import System.Process ( rawSystem )
import System.FilePath ( (</>) )
import System.Directory ( findExecutable )
import Distribution.Simple.Utils (info, rawSystemExit)
import Distribution.Simple.Setup
import Distribution.Simple.LocalBuildInfo
import Distribution.Verbosity

main :: IO ()
main = defaultMainWithHooks $ simpleUserHooks {
      -- enable hsb2hs preprocessor for .hsb files
      hookedPreProcessors = [ppBlobSuffixHandler]
      -- ensure that make-pandoc-man-pages doesn't get installed to bindir
    , copyHook = \pkgdescr ->
         copyHook simpleUserHooks pkgdescr{ executables =
            [x | x <- executables pkgdescr, exeName x `notElem` noInstall] }
    , instHook = \pkgdescr ->
         instHook simpleUserHooks pkgdescr{ executables =
            [x | x <- executables pkgdescr, exeName x `notElem` noInstall] }
    , postBuild = \args bf pkgdescr lbi -> do
            makeManPages args bf pkgdescr lbi
            makeReferenceFiles args bf pkgdescr lbi
    }
  where
    noInstall = ["make-pandoc-man-pages","make-reference-files"]

ppBlobSuffixHandler :: PPSuffixHandler
ppBlobSuffixHandler = ("hsb", \_ _ ->
  PreProcessor {
    platformIndependent = True,
    runPreProcessor = mkSimplePreProcessor $ \infile outfile verbosity ->
      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 ()
  })

makeManPages :: Args -> BuildFlags -> PackageDescription -> LocalBuildInfo -> IO ()
makeManPages _ bf _ LocalBuildInfo{buildDir=buildDir}
  = rawSystemExit verbosity progPath []
  where
    verbosity = fromFlagOrDefault normal $ buildVerbosity bf
    progPath = buildDir </> "make-pandoc-man-pages" </> "make-pandoc-man-pages"

makeReferenceFiles :: Args -> BuildFlags -> PackageDescription -> LocalBuildInfo -> IO ()
makeReferenceFiles _ bf _ LocalBuildInfo{buildDir=buildDir}
  = mapM_
      (rawSystemExit verbosity progPath . return)
      referenceFormats
  where
    verbosity = fromFlagOrDefault normal $ buildVerbosity bf
    progPath = buildDir </> "make-reference-files" </> "make-reference-files"
    referenceFormats = ["docx", "odt"]