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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 ItemProcessors
( ItemProcessor
, itemFileProcessor
, ThumbnailProcessor
, thumbnailFileProcessor
) where
import Data.Function ((&))
import Data.Char (toLower)
import System.FilePath (takeExtension)
import Config (Resolution(..))
import Resource (ItemProcessor, ThumbnailProcessor, Thumbnail(..), GalleryItemProps(..))
import Caching (Cache)
import FileProcessors
import Files
data Format =
PictureFormat
| PlainTextFormat
| PortableDocumentFormat
| VideoFormat
| AudioFormat
| Unknown
formatFromPath :: Path -> Format
formatFromPath =
maybe Unknown ((fromExt . map toLower) . takeExtension) . fileName
where
fromExt :: String -> Format
fromExt ext = case ext of
".bmp" -> PictureFormat
".jpg" -> PictureFormat
".jpeg" -> PictureFormat
".png" -> PictureFormat
".tiff" -> PictureFormat
".hdr" -> PictureFormat
".gif" -> PictureFormat
".txt" -> PlainTextFormat
".md" -> PlainTextFormat -- TODO: handle markdown separately
".pdf" -> PortableDocumentFormat
".wav" -> AudioFormat
".oga" -> AudioFormat
".ogg" -> AudioFormat
".spx" -> AudioFormat
".opus" -> AudioFormat
".flac" -> AudioFormat
".m4a" -> AudioFormat
".mp3" -> AudioFormat
".ogv" -> VideoFormat
".ogx" -> VideoFormat
".webm" -> VideoFormat
".mkv" -> VideoFormat
".mp4" -> VideoFormat
_ -> Unknown
type ItemFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ItemProcessor
itemFileProcessor :: Maybe Resolution -> Cache -> ItemFileProcessor
itemFileProcessor maxResolution cached inputBase outputBase resClass inputRes =
cached processor inPath outPath
>> resourceAt outPath relOutPath
>>= descriptor outPath
where
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
(processor, descriptor) = processorFor (formatFromPath inputRes) maxResolution
processorFor :: Format -> Maybe Resolution -> (FileProcessor, ItemDescriber)
processorFor PictureFormat (Just maxRes) = (resizePictureUpTo maxRes, getPictureProps)
processorFor PictureFormat Nothing = (copyFileProcessor, getPictureProps)
processorFor PlainTextFormat _ = (copyFileProcessor, const $ return . PlainText)
processorFor PortableDocumentFormat _ = (copyFileProcessor, const $ return . PDF)
processorFor VideoFormat _ = (copyFileProcessor, const $ return . Video)
processorFor AudioFormat _ = (copyFileProcessor, const $ return . Audio)
-- TODO: handle video reencoding and others?
processorFor Unknown _ = (copyFileProcessor, const $ return . Other)
type ThumbnailFileProcessor =
FileName -- ^ Input base path
-> FileName -- ^ Output base path
-> FileName -- ^ Output class (subdir)
-> ThumbnailProcessor
thumbnailFileProcessor :: Resolution -> Cache -> ThumbnailFileProcessor
thumbnailFileProcessor maxRes cached inputBase outputBase resClass inputRes =
cached <$> processorFor (formatFromPath inputRes)
& process
where
relOutPath = resClass /> inputRes
inPath = localPath $ inputBase /> inputRes
outPath = localPath $ outputBase /> relOutPath
process :: Maybe FileProcessor -> IO (Maybe Thumbnail)
process Nothing = return Nothing
process (Just proc) =
do
proc inPath outPath
resource <- resourceAt outPath relOutPath
resolution <- getImageResolution outPath
return $ Just $ Thumbnail resource resolution
processorFor :: Format -> Maybe FileProcessor
processorFor PictureFormat = Just $ resizePictureUpTo maxRes
processorFor _ = Nothing
|