-- |
-- Module      :  Commands.Refresh
-- Copyright   :  (C) 2016  Jens Petersen
--
-- Maintainer  :  Jens Petersen <petersen@fedoraproject.org>
--
-- Explanation: refresh spec file to newer cabal-rpm

-- 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 3 of the License, or
-- (at your option) any later version.

module Commands.Refresh (
  refresh
  ) where

import Commands.Spec (createSpecFile)
import PackageUtils (PackageData (..))
import Setup (RpmFlags (..))
import SysCmd (cmd_, shell, (+-+))

import Distribution.Simple.Utils (die)

refresh :: PackageData -> RpmFlags -> IO ()
refresh pkgdata flags =
  case specFilename pkgdata of
    Nothing -> die "No (unique) .spec file in directory."
    Just spec -> do
      -- FIXME: later this should read the cabal-rpm version header line
      oldspec <- createOldSpec "0.9.6" spec
      newspec <- createSpecFile pkgdata flags Nothing
      shell $ "diff -u2 -I \"- spec file generated by cabal-rpm\" -I \"Fedora Haskell SIG <haskell@lists.fedoraproject.org>\"" +-+ oldspec +-+ newspec +-+ "| sed -e 's/.cblrpm//' | patch" +-+ "|| :"
--          setCurrentDirectory cwd
--          when rwGit $
--            cmd_ "git" ["commit", "-a", "-m", "update to" +-+ newver]
  where
    createOldSpec :: String -> String -> IO FilePath
    createOldSpec crVer spec = do
      cmd_ ("cabal-rpm-" ++ crVer) ["spec"]
      let backup = spec ++ ".cblrpm"
          backup' = backup ++ "-" ++ crVer
      cmd_ "mv" [backup, backup']
      return backup'