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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 Processors
( Resolution(..)
, ItemFileProcessor, itemFileProcessor
, ThumbnailFileProcessor, thumbnailFileProcessor
, skipCached, withCached
) where
import Control.Exception (Exception, throwIO)
import Control.Monad (when)
import Data.Function ((&))
import Data.Char (toLower)
import Text.Read (readMaybe)
import System.Directory hiding (copyFile)
import qualified System.Directory
import System.FilePath
import System.Process (callProcess, readProcess)
import Resource
( ItemProcessor, ThumbnailProcessor
, GalleryItemProps(..), Resolution(..), Resource(..), Thumbnail(..) )
import Files
data ProcessingException = ProcessingException FilePath String deriving Show
instance Exception ProcessingException
-- TODO: handle video, music, text...
data Format = PictureFormat | Unknown
formatFromPath :: Path -> Format
formatFromPath =
maybe Unknown fromExt
. fmap (map toLower)
. fmap 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
_ -> Unknown
type FileProcessor =
FileName -- ^ Input path
-> FileName -- ^ Output path
-> IO ()
copyFileProcessor :: FileProcessor
copyFileProcessor inputPath outputPath =
(putStrLn $ "Copying:\t" ++ outputPath)
>> ensureParentDir (flip System.Directory.copyFile) outputPath inputPath
resizePictureUpTo :: Resolution -> FileProcessor
resizePictureUpTo maxResolution inputPath outputPath =
(putStrLn $ "Generating:\t" ++ outputPath)
>> ensureParentDir (flip resize) outputPath inputPath
where
maxSize :: Resolution -> String
maxSize Resolution{width, height} = show width ++ "x" ++ show height ++ ">"
resize :: FileName -> FileName -> IO ()
resize input output = callProcess "magick"
[ input
, "-auto-orient"
, "-resize", maxSize maxResolution
, output ]
type Cache = FileProcessor -> FileProcessor
skipCached :: Cache
skipCached processor inputPath outputPath =
removePathForcibly outputPath
>> processor inputPath outputPath
withCached :: Cache
withCached processor inputPath outputPath =
do
isDir <- doesDirectoryExist outputPath
when isDir $ removePathForcibly outputPath
fileExists <- doesFileExist outputPath
if fileExists then
do
needUpdate <- isOutdated True inputPath outputPath
if needUpdate then update else skip
else
update
where
update = processor inputPath outputPath
skip = putStrLn $ "Skipping:\t" ++ outputPath
resourceAt :: FilePath -> Path -> IO Resource
resourceAt fsPath resPath = getModificationTime fsPath >>= return . Resource resPath
getImageResolution :: FilePath -> IO Resolution
getImageResolution fsPath =
readProcess "magick" ["identify", "-format", "%w %h", firstFrame] []
>>= parseResolution . break (== ' ')
where
firstFrame :: FilePath
firstFrame = fsPath ++ "[0]"
parseResolution :: (String, String) -> IO Resolution
parseResolution (widthString, heightString) =
case (readMaybe widthString, readMaybe heightString) of
(Just w, Just h) -> return $ Resolution w h
_ -> throwIO $ ProcessingException fsPath "Unable to read image resolution."
getPictureProps :: ItemDescriber
getPictureProps fsPath resource =
getImageResolution fsPath
>>= return . Picture resource
type ItemDescriber =
FilePath
-> Resource
-> IO GalleryItemProps
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)
-- 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
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