%  Copyright (C) 2003,2005 David Roundy
%
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%  it under the terms of the GNU General Public License as published by
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%  GNU General Public License for more details.
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\darcsCommand{repair}
\begin{code}
module Darcs.Commands.Repair ( repair, repairCmd ) where
import Control.Monad( unless )
import System.Directory( renameFile )

import Darcs.Commands
import Darcs.Arguments ( DarcsFlag( Quiet ),
                        workingRepoDir, umaskOption,
                      )
import Darcs.Repository ( withRepoLock, ($-), amInRepository,
                          replacePristine, writePatchSet )
import Darcs.Repository.Repair( replayRepository, checkIndex
                              , RepositoryConsistency(..) )

repairDescription :: String
repairDescription = "Repair a corrupted repository."

repairHelp :: String
repairHelp =
 "The `darcs repair' command attempts to fix corruption in the current\n" ++
 "repository.  Currently it can only repair damage to the pristine tree,\n" ++
 "which is where most corruption occurs.\n"

repair :: DarcsCommand
repair = DarcsCommand {commandProgramName = "darcs",
                       commandName = "repair",
                       commandHelp = repairHelp,
                       commandDescription = repairDescription,
                       commandExtraArgs = 0,
                       commandExtraArgHelp = [],
                       commandCommand = repairCmd,
                       commandPrereq = amInRepository,
                       commandGetArgPossibilities = return [],
                       commandArgdefaults = nodefaults,
                       commandAdvancedOptions = [umaskOption],
                       commandBasicOptions = [workingRepoDir]}

repairCmd :: [DarcsFlag] -> [String] -> IO ()
repairCmd opts _ = withRepoLock opts $- \repository -> do
  replayRepository repository opts $ \state ->
    case state of
      RepositoryConsistent ->
          putStrLn "The repository is already consistent, no changes made."
      BrokenPristine tree -> do
               putStrLn "Fixing pristine tree..."
               replacePristine repository tree
      BrokenPatches tree newps  -> do
               putStrLn "Writing out repaired patches..."
               writePatchSet newps opts
               putStrLn "Fixing pristine tree..."
               replacePristine repository tree
               return ()
  index_ok <- checkIndex repository (Quiet `elem` opts)
  unless index_ok $ do renameFile "_darcs/index" "_darcs/index.bad"
                       putStrLn "Bad index discarded."

\end{code}