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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
) 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.LocalTime (ZonedTime)
import Data.Yaml (ParseException, decodeFileEither)
import Data.Aeson (FromJSON)
import System.FilePath (isExtensionOf, dropExtension)
import System.Directory (doesFileExist)
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
, sidecar :: Sidecar }
| InputDir
{ path :: Path
, 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"
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) =
readSidecarFile (localPath $ anchor /> path <.> sidecarExt)
>>= return . InputFile path
>>= return . Just
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} =
mapM mkInputNode items
>>= return . catMaybes
>>= return . InputDir path (findThumbnail items)
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 ("thumbnail" ==))
findThumbnail :: [FSNode] -> Maybe Path
findThumbnail = (fmap Files.path) . (find isThumbnail)
|