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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 FileProcessors
( FileProcessor
, copyFileProcessor
, resizePictureUpTo
, resourceAt
, getImageResolution
, ItemDescriber
, getPictureProps
) where
import Control.Exception (Exception, throwIO)
import System.Process (readProcess, callProcess)
import Text.Read (readMaybe)
import System.Directory (getModificationTime)
import qualified System.Directory
import Config (Resolution(..))
import Resource (Resource(..), GalleryItemProps(..))
import Files
data ProcessingException = ProcessingException FilePath String deriving Show
instance Exception ProcessingException
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 ]
resourceAt :: FilePath -> Path -> IO Resource
resourceAt fsPath resPath = Resource resPath <$> getModificationTime fsPath
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."
type ItemDescriber =
FilePath
-> Resource
-> IO GalleryItemProps
getPictureProps :: ItemDescriber
getPictureProps fsPath resource = Picture resource <$> getImageResolution fsPath
|