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-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019-2020 Pacien TRAN-GIRARD
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as
-- published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program. If not, see <https://www.gnu.org/licenses/>.
module Input
( decodeYamlFile
, Sidecar(..)
, InputTree(..), readInputTree, filterInputTree
) where
import GHC.Generics (Generic)
import Control.Exception (Exception, AssertionFailed(..), throw, throwIO)
import Control.Monad.IO.Class (MonadIO, liftIO)
import Data.Function ((&))
import Data.Maybe (catMaybes)
import Data.Bool (bool)
import Data.List (find)
import Data.Time.Clock (UTCTime)
import Data.Time.LocalTime (ZonedTime)
import Data.Yaml (ParseException, decodeFileEither)
import Data.Aeson (FromJSON)
import System.FilePath (isExtensionOf, dropExtension)
import System.Directory (doesFileExist, getModificationTime)
import Files
data LoadException = LoadException String ParseException deriving Show
instance Exception LoadException
decodeYamlFile :: (MonadIO m, FromJSON a) => FileName -> m a
decodeYamlFile path =
liftIO $ Data.Yaml.decodeFileEither path
>>= either (throwIO . LoadException path) return
-- | Tree representing the input from the input directory.
data InputTree =
InputFile
{ path :: Path
, modTime :: UTCTime
, sidecar :: Sidecar }
| InputDir
{ path :: Path
, modTime :: UTCTime
, sidecar :: Sidecar
, dirThumbnailPath :: Maybe Path
, items :: [InputTree] }
deriving Show
data Sidecar = Sidecar
{ title :: Maybe String
, datetime :: Maybe ZonedTime
, description :: Maybe String
, tags :: Maybe [String]
} deriving (Generic, FromJSON, Show)
emptySidecar :: Sidecar
emptySidecar = Sidecar
{ title = Nothing
, datetime = Nothing
, description = Nothing
, tags = Nothing }
sidecarExt :: String
sidecarExt = "yaml"
dirPropFile :: String
dirPropFile = "_directory"
dirSidecar :: Path
dirSidecar = Path [dirPropFile] <.> sidecarExt
readSidecarFile :: FilePath -> IO Sidecar
readSidecarFile filepath =
doesFileExist filepath
>>= bool (return Nothing) (decodeYamlFile filepath)
>>= return . maybe emptySidecar id
readInputTree :: AnchoredFSNode -> IO InputTree
readInputTree (AnchoredFSNode _ File{}) =
throw $ AssertionFailed "Input directory is a file"
readInputTree (AnchoredFSNode anchor root@Dir{}) = mkDirNode root
where
mkInputNode :: FSNode -> IO (Maybe InputTree)
mkInputNode file@File{path}
| (not $ isSidecar file) && (not $ isThumbnail file) =
do
sidecar <- readSidecarFile $ localPath (anchor /> path <.> sidecarExt)
modTime <- getModificationTime $ localPath (anchor /> path)
return $ Just $ InputFile path modTime sidecar
mkInputNode File{} = return Nothing
mkInputNode dir@Dir{} = mkDirNode dir >>= return . Just
mkDirNode :: FSNode -> IO InputTree
mkDirNode File{} = throw $ AssertionFailed "Input directory is a file"
mkDirNode Dir{path, items} =
do
dirItems <- mapM mkInputNode items
modTime <- getModificationTime $ localPath (anchor /> path)
sidecar <- readSidecarFile $ localPath (anchor /> path </> dirSidecar)
return $ InputDir path modTime sidecar (findThumbnail items) (catMaybes dirItems)
isSidecar :: FSNode -> Bool
isSidecar Dir{} = False
isSidecar File{path} =
fileName path
& (maybe False $ isExtensionOf sidecarExt)
isThumbnail :: FSNode -> Bool
isThumbnail Dir{} = False
isThumbnail File{path} =
fileName path
& fmap dropExtension
& (maybe False (dirPropFile ==))
findThumbnail :: [FSNode] -> Maybe Path
findThumbnail = (fmap Files.path) . (find isThumbnail)
-- | Filters an InputTree. The root is always returned.
filterInputTree :: (InputTree -> Bool) -> InputTree -> InputTree
filterInputTree cond = filterNode
where
filterNode :: InputTree -> InputTree
filterNode inputFile@InputFile{} = inputFile
filterNode inputDir@InputDir{items} =
filter cond items
& map filterNode
& \curatedItems -> inputDir { items = curatedItems } :: InputTree
|