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|
{- git-annex commands
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command where
import Control.Monad.State (liftIO)
import System.Directory
import System.Posix.Files
import Control.Monad (filterM)
import System.Path.WildMatch
import Text.Regex.PCRE.Light.Char8
import Types
import qualified Backend
import Messages
import qualified Annex
import qualified GitRepo as Git
import Locations
{- A command runs in four stages.
-
- 0. The seek stage takes the parameters passed to the command,
- looks through the repo to find the ones that are relevant
- to that command (ie, new files to add), and generates
- a list of start stage actions. -}
type CommandSeek = [String] -> Annex [CommandStart]
{- 1. The start stage is run before anything is printed about the
- command, is passed some input, and can early abort it
- if the input does not make sense. It should run quickly and
- should not modify Annex state. -}
type CommandStart = Annex (Maybe CommandPerform)
{- 2. The perform stage is run after a message is printed about the command
- being run, and it should be where the bulk of the work happens. -}
type CommandPerform = Annex (Maybe CommandCleanup)
{- 3. The cleanup stage is run only if the perform stage succeeds, and it
- returns the overall success/fail of the command. -}
type CommandCleanup = Annex Bool
{- Some helper functions are used to build up CommandSeek and CommandStart
- functions. -}
type CommandSeekStrings = CommandStartString -> CommandSeek
type CommandStartString = String -> CommandStart
type BackendFile = (FilePath, Maybe Backend)
type CommandSeekBackendFiles = CommandStartBackendFile -> CommandSeek
type CommandStartBackendFile = BackendFile -> CommandStart
type AttrFile = (FilePath, String)
type CommandSeekAttrFiles = CommandStartAttrFile -> CommandSeek
type CommandStartAttrFile = AttrFile -> CommandStart
type CommandSeekNothing = CommandStart -> CommandSeek
type CommandStartNothing = CommandStart
data Command = Command {
cmdname :: String,
cmdparams :: String,
cmdseek :: [CommandSeek],
cmddesc :: String
}
{- Prepares a list of actions to run to perform a command, based on
- the parameters passed to it. -}
prepCmd :: Command -> [String] -> Annex [Annex Bool]
prepCmd Command { cmdseek = seek } params = do
lists <- mapM (\s -> s params) seek
return $ map doCommand $ concat lists
{- Runs a command through the start, perform and cleanup stages -}
doCommand :: CommandStart -> CommandCleanup
doCommand start = do
s <- start
case s of
Nothing -> return True
Just perform -> do
p <- perform
case p of
Nothing -> do
showEndFail
return False
Just cleanup -> do
c <- cleanup
if c
then do
showEndOk
return True
else do
showEndFail
return False
notAnnexed :: FilePath -> Annex (Maybe a) -> Annex (Maybe a)
notAnnexed file a = do
r <- Backend.lookupFile file
case r of
Just _ -> return Nothing
Nothing -> a
isAnnexed :: FilePath -> ((Key, Backend) -> Annex (Maybe a)) -> Annex (Maybe a)
isAnnexed file a = do
r <- Backend.lookupFile file
case r of
Just v -> a v
Nothing -> return Nothing
{- These functions find appropriate files or other things based on a
user's parameters, and run a specified action on them. -}
withFilesInGit :: CommandSeekStrings
withFilesInGit a params = do
repo <- Annex.gitRepo
files <- liftIO $ Git.inRepo repo params
files' <- filterFiles files
return $ map a files'
withAttrFilesInGit :: String -> CommandSeekAttrFiles
withAttrFilesInGit attr a params = do
repo <- Annex.gitRepo
files <- liftIO $ Git.inRepo repo params
files' <- filterFiles files
pairs <- liftIO $ Git.checkAttr repo attr files'
return $ map a pairs
withBackendFilesInGit :: CommandSeekBackendFiles
withBackendFilesInGit a params = do
repo <- Annex.gitRepo
files <- liftIO $ Git.inRepo repo params
files' <- filterFiles files
backendPairs a files'
withFilesMissing :: CommandSeekStrings
withFilesMissing a params = do
files <- liftIO $ filterM missing params
files' <- filterFiles files
return $ map a files'
where
missing f = do
e <- doesFileExist f
return $ not e
withFilesNotInGit :: CommandSeekBackendFiles
withFilesNotInGit a params = do
repo <- Annex.gitRepo
newfiles <- liftIO $ Git.notInRepo repo params
newfiles' <- filterFiles newfiles
backendPairs a newfiles'
withString :: CommandSeekStrings
withString a params = return [a $ unwords params]
withStrings :: CommandSeekStrings
withStrings a params = return $ map a params
withFilesToBeCommitted :: CommandSeekStrings
withFilesToBeCommitted a params = do
repo <- Annex.gitRepo
tocommit <- liftIO $ Git.stagedFiles repo params
tocommit' <- filterFiles tocommit
return $ map a tocommit'
withFilesUnlocked :: CommandSeekBackendFiles
withFilesUnlocked = withFilesUnlocked' Git.typeChangedFiles
withFilesUnlockedToBeCommitted :: CommandSeekBackendFiles
withFilesUnlockedToBeCommitted = withFilesUnlocked' Git.typeChangedStagedFiles
withFilesUnlocked' :: (Git.Repo -> [FilePath] -> IO [FilePath]) -> CommandSeekBackendFiles
withFilesUnlocked' typechanged a params = do
-- unlocked files have changed type from a symlink to a regular file
repo <- Annex.gitRepo
typechangedfiles <- liftIO $ typechanged repo params
unlockedfiles <- liftIO $ filterM notSymlink $
map (\f -> Git.workTree repo ++ "/" ++ f) typechangedfiles
unlockedfiles' <- filterFiles unlockedfiles
backendPairs a unlockedfiles'
withKeys :: CommandSeekStrings
withKeys a params = return $ map a params
withTempFile :: CommandSeekStrings
withTempFile a params = return $ map a params
withNothing :: CommandSeekNothing
withNothing a [] = return [a]
withNothing _ _ = return []
backendPairs :: CommandSeekBackendFiles
backendPairs a files = do
pairs <- Backend.chooseBackends files
return $ map a pairs
{- Filter out files from the state directory, and those matching the
- exclude glob pattern, if it was specified. -}
filterFiles :: [FilePath] -> Annex [FilePath]
filterFiles l = do
let l' = filter notState l
exclude <- Annex.flagGet "exclude"
if null exclude
then return l'
else do
let regexp = compile ("^" ++ wildToRegex exclude) []
return $ filter (notExcluded regexp) l'
where
notState f = stateLoc /= take stateLocLen f
stateLocLen = length stateLoc
notExcluded r f = case match r f [] of
Nothing -> True
Just _ -> False
{- filter out symlinks -}
notSymlink :: FilePath -> IO Bool
notSymlink f = do
s <- liftIO $ getSymbolicLinkStatus f
return $ not $ isSymbolicLink s
{- Descriptions of params used in usage messages. -}
paramRepeating :: String -> String
paramRepeating s = s ++ " ..."
paramOptional :: String -> String
paramOptional s = "[" ++ s ++ "]"
paramPath :: String
paramPath = "PATH"
paramKey :: String
paramKey = "KEY"
paramDesc :: String
paramDesc = "DESCRIPTION"
paramNumber :: String
paramNumber = "NUMBER"
paramRemote :: String
paramRemote = "REMOTE"
paramGlob :: String
paramGlob = "GLOB"
paramName :: String
paramName = "NAME"
paramNothing :: String
paramNothing = ""
|
