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|
-- ldgallery - A static generator which turns a collection of tagged
-- pictures into a searchable web gallery.
--
-- Copyright (C) 2019 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/>.
{-# LANGUAGE
DuplicateRecordFields
, DeriveGeneric
, DeriveAnyClass
, NamedFieldPuns
#-}
module Resource
( DirProcessor, ItemProcessor, ThumbnailProcessor
, GalleryItem, GalleryItemProps, Resolution(..)
, buildGalleryTree, galleryCleanupResourceDir
) where
import Control.Concurrent.ParallelIO.Global (parallel)
import Data.Function ((&))
import Data.List ((\\), subsequences, sortBy)
import Data.Ord (comparing)
import Data.Char (toLower)
import Data.Maybe (mapMaybe, fromMaybe)
import qualified Data.Set as Set
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
type FileSizeKB = Int
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
| Other
deriving (Generic, Show)
instance ToJSON GalleryItemProps where
toJSON = genericToJSON encodingOptions
toEncoding = genericToEncoding encodingOptions
data GalleryItem = GalleryItem
{ title :: String
, date :: String -- TODO: checked ISO8601 date
, 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 DirProcessor = Path -> IO Path
type ItemProcessor = Path -> IO Path
type ThumbnailProcessor = Path -> IO (Maybe Path)
buildGalleryTree ::
DirProcessor -> ItemProcessor -> ThumbnailProcessor
-> String -> InputTree -> IO GalleryItem
buildGalleryTree processDir processItem processThumbnail galleryName inputTree =
mkGalleryItem inputTree >>= return . named galleryName
where
named :: String -> GalleryItem -> GalleryItem
named name item = item { title = name }
mkGalleryItem :: InputTree -> IO GalleryItem
mkGalleryItem InputFile{path, sidecar} =
do
processedItem <- processItem path
processedThumbnail <- processThumbnail path
return GalleryItem
{ title = optMeta title $ fileName path
, date = optMeta date "" -- TODO: check and normalise dates
, description = optMeta description ""
, tags = optMeta tags []
, path = processedItem
, thumbnail = processedThumbnail
, properties = Other } -- TODO
where
optMeta :: (Sidecar -> Maybe a) -> a -> a
optMeta get fallback = fromMaybe fallback $ get sidecar
mkGalleryItem InputDir{path, dirThumbnailPath, items} =
do
processedDir <- processDir path
processedThumbnail <- maybeThumbnail dirThumbnailPath
processedItems <- parallel $ map mkGalleryItem items
return GalleryItem
{ title = fileName path
-- TODO: consider using the most recent item's date? what if empty?
, date = ""
-- TODO: consider allowing metadata sidecars for directories too
, description = ""
, tags = aggregateChildTags processedItems
, path = processedDir
, thumbnail = processedThumbnail
, properties = Directory processedItems }
where
maybeThumbnail :: Maybe Path -> IO (Maybe Path)
maybeThumbnail Nothing = return Nothing
maybeThumbnail (Just path) = processThumbnail path
aggregateChildTags :: [GalleryItem] -> [Tag]
aggregateChildTags = unique . concatMap (\item -> tags (item::GalleryItem))
unique :: Ord a => [a] -> [a]
unique = Set.toList . Set.fromList
flattenGalleryTree :: GalleryItem -> [GalleryItem]
flattenGalleryTree dir@(GalleryItem _ _ _ _ _ _ (Directory items)) =
dir : concatMap flattenGalleryTree items
flattenGalleryTree simple = [simple]
galleryOutputDiff :: GalleryItem -> FSNode -> [Path]
galleryOutputDiff resources ref =
(fsPaths ref) \\ (resPaths $ flattenGalleryTree resources)
where
resPaths :: [GalleryItem] -> [Path]
resPaths resList = map (path::(GalleryItem->Path)) resList ++ thumbnailPaths resList
thumbnailPaths :: [GalleryItem] -> [Path]
thumbnailPaths = (concatMap subPaths) . (mapMaybe thumbnail)
fsPaths :: FSNode -> [Path]
fsPaths = map nodePath . tail . flattenDir
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
|