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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 Resource
( ItemProcessor, ThumbnailProcessor
, GalleryItem(..), GalleryItemProps(..), Resolution(..)
, buildGalleryTree, galleryCleanupResourceDir
) where
import Control.Concurrent.ParallelIO.Global (parallel)
import Data.List ((\\), sortBy)
import Data.Ord (comparing)
import Data.Char (toLower)
import Data.Maybe (mapMaybe, fromMaybe)
import Data.Function ((&))
import qualified Data.Set as Set
import Data.Time.Clock (UTCTime)
import Data.Time.LocalTime (ZonedTime, utc, utcToZonedTime, zonedTimeToUTC)
import Safe.Foldable (maximumByMay)
import GHC.Generics (Generic)
import Data.Aeson (FromJSON, ToJSON, genericToJSON, genericToEncoding)
import qualified Data.Aeson as JSON
import Files
import Input (InputTree(..), Sidecar(..))
encodingOptions :: JSON.Options
encodingOptions = JSON.defaultOptions
{ JSON.fieldLabelModifier = map toLower
, JSON.constructorTagModifier = map toLower
, JSON.sumEncoding = JSON.defaultTaggedObject
{ JSON.tagFieldName = "type"
, JSON.contentsFieldName = "contents"
}
}
type Tag = String
data Resolution = Resolution
{ width :: Int
, height :: Int
} deriving (Generic, Show, FromJSON)
instance ToJSON Resolution where
toJSON = genericToJSON encodingOptions
toEncoding = genericToEncoding encodingOptions
data GalleryItemProps =
Directory { items :: [GalleryItem] }
| Picture { resource :: Path }
| Other { resource :: Path }
deriving (Generic, Show)
instance ToJSON GalleryItemProps where
toJSON = genericToJSON encodingOptions
toEncoding = genericToEncoding encodingOptions
data GalleryItem = GalleryItem
{ title :: String
, datetime :: ZonedTime
, description :: String
, tags :: [Tag]
, path :: Path
, thumbnail :: Maybe Path
, properties :: GalleryItemProps
} deriving (Generic, Show)
instance ToJSON GalleryItem where
toJSON = genericToJSON encodingOptions
toEncoding = genericToEncoding encodingOptions
type ItemProcessor = Path -> IO GalleryItemProps
type ThumbnailProcessor = Path -> IO (Maybe Path)
buildGalleryTree ::
ItemProcessor -> ThumbnailProcessor
-> Int -> String -> InputTree -> IO GalleryItem
buildGalleryTree processItem processThumbnail tagsFromDirectories galleryName inputTree =
mkGalleryItem (Just galleryName) (Path []) inputTree
where
mkGalleryItem :: Maybe String -> Path -> InputTree -> IO GalleryItem
mkGalleryItem _ parents InputFile{path, modTime, sidecar} =
do
properties <- processItem path
processedThumbnail <- processThumbnail path
return GalleryItem
{ title = itemTitle
, datetime = fromMaybe (toZonedTime modTime) (Input.datetime sidecar)
, description = optMeta description ""
, tags = (optMeta tags []) ++ implicitParentTags parents
, path = parents </ itemTitle
, thumbnail = processedThumbnail
, properties = properties }
where
itemTitle :: String
itemTitle = optMeta title $ fromMaybe "" $ fileName path
optMeta :: (Sidecar -> Maybe a) -> a -> a
optMeta get fallback = fromMaybe fallback $ get sidecar
mkGalleryItem rootTitle parents InputDir{path, modTime, dirThumbnailPath, items} =
do
processedThumbnail <- maybeThumbnail dirThumbnailPath
processedItems <- parallel $ map (mkGalleryItem Nothing itemPath) items
return GalleryItem
{ title = itemTitle
, datetime = fromMaybe (toZonedTime modTime) (mostRecentChildModTime processedItems)
, description = ""
, tags = (aggregateChildTags processedItems) ++ implicitParentTags parents
, path = itemPath
, thumbnail = processedThumbnail
, properties = Directory processedItems }
where
itemTitle :: String
itemTitle = flip fromMaybe rootTitle (fromMaybe "" $ fileName path)
itemPath :: Path
itemPath = parents </ itemTitle
maybeThumbnail :: Maybe Path -> IO (Maybe Path)
maybeThumbnail Nothing = return Nothing
maybeThumbnail (Just thumbnailPath) = processThumbnail thumbnailPath
mostRecentChildModTime :: [GalleryItem] -> Maybe ZonedTime
mostRecentChildModTime =
maximumByMay comparingTime . map (datetime::(GalleryItem -> ZonedTime))
comparingTime :: ZonedTime -> ZonedTime -> Ordering
comparingTime l r = compare (zonedTimeToUTC l) (zonedTimeToUTC r)
aggregateChildTags :: [GalleryItem] -> [Tag]
aggregateChildTags = unique . concatMap (\item -> tags (item::GalleryItem))
unique :: Ord a => [a] -> [a]
unique = Set.toList . Set.fromList
implicitParentTags :: Path -> [Tag]
implicitParentTags (Path elements) = take tagsFromDirectories elements
toZonedTime :: UTCTime -> ZonedTime
toZonedTime = utcToZonedTime utc
flattenGalleryTree :: GalleryItem -> [GalleryItem]
flattenGalleryTree dir@(GalleryItem _ _ _ _ _ _ (Directory items)) =
dir : concatMap flattenGalleryTree items
flattenGalleryTree simple = [simple]
galleryOutputDiff :: GalleryItem -> FSNode -> [Path]
galleryOutputDiff resources ref =
(filesystemPaths ref) \\ (compiledPaths $ flattenGalleryTree resources)
where
filesystemPaths :: FSNode -> [Path]
filesystemPaths = map Files.path . tail . flattenDir
compiledPaths :: [GalleryItem] -> [Path]
compiledPaths items =
resourcePaths items ++ thumbnailPaths items
& concatMap subPaths
resourcePaths :: [GalleryItem] -> [Path]
resourcePaths = mapMaybe (resourcePath . properties)
resourcePath :: GalleryItemProps -> Maybe Path
resourcePath Directory{} = Nothing
resourcePath resourceProps = Just $ resource resourceProps
thumbnailPaths :: [GalleryItem] -> [Path]
thumbnailPaths = mapMaybe thumbnail
galleryCleanupResourceDir :: GalleryItem -> FileName -> IO ()
galleryCleanupResourceDir resourceTree outputDir =
readDirectory outputDir
>>= return . galleryOutputDiff resourceTree . root
>>= return . sortBy (flip $ comparing pathLength) -- nested files before dirs
>>= return . map (localPath . (/>) outputDir)
>>= mapM_ remove
|