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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
#-}
module Files
( FileName, LocalPath, WebPath, Path
, (</>), (</), (/>), (<.>), fileName, subPaths, pathLength
, localPath, webPath
, FSNode(..), AnchoredFSNode(..)
, nodePath, nodeName, isHidden, flattenDir, filterDir, readDirectory
, ensureParentDir, remove, isOutdated
) where
import Control.Monad (filterM, mapM)
import Data.Bool (bool)
import Data.List (isPrefixOf, length, deleteBy, subsequences)
import Data.Function ((&))
import Data.Text (pack)
import Data.Aeson (ToJSON)
import qualified Data.Aeson as JSON
import System.Directory
( doesDirectoryExist
, doesPathExist
, getModificationTime
, listDirectory
, createDirectoryIfMissing
, removePathForcibly )
import qualified System.FilePath
import qualified System.FilePath.Posix
type FileName = String
type LocalPath = String
type WebPath = String
-- | Reversed path component list
data Path = Path [FileName] deriving Show
instance ToJSON Path where
toJSON = JSON.String . pack . webPath
instance Eq Path where
(Path left) == (Path right) = left == right
(</>) :: Path -> Path -> Path
(Path l) </> (Path r) = Path (r ++ l)
(</) :: Path -> FileName -> Path
(Path path) </ file = Path (file:path)
(/>) :: FileName -> Path -> Path
file /> (Path path) = Path (path ++ [file])
(<.>) :: Path -> String -> Path
(Path (filename:pathto)) <.> ext =
Path $ System.FilePath.addExtension filename ext : pathto
fileName :: Path -> FileName
fileName (Path (name:_)) = name
subPaths :: Path -> [Path]
subPaths (Path path) = map (Path . subsequences) path
pathLength :: Path -> Int
pathLength (Path path) = Data.List.length path
localPath :: Path -> LocalPath
localPath (Path path) = System.FilePath.joinPath $ reverse path
webPath :: Path -> WebPath
webPath (Path path) = System.FilePath.Posix.joinPath $ reverse path
data FSNode = File Path | Dir Path [FSNode] deriving Show
data AnchoredFSNode = AnchoredFSNode
{ anchor :: LocalPath
, root :: FSNode } deriving Show
nodePath :: FSNode -> Path
nodePath (File path) = path
nodePath (Dir path _) = path
nodeName :: FSNode -> FileName
nodeName = fileName . nodePath
isHidden :: FSNode -> Bool
isHidden node = "." `isPrefixOf` filename &&length filename > 1
where filename = nodeName node
-- | DFS with intermediate dirs first.
flattenDir :: FSNode -> [FSNode]
flattenDir file@(File _) = [file]
flattenDir dir@(Dir _ items) = dir:(concatMap flattenDir items)
-- | Filters a dir tree. The root is always returned.
filterDir :: (FSNode -> Bool) -> AnchoredFSNode -> AnchoredFSNode
filterDir cond (AnchoredFSNode anchor root) =
AnchoredFSNode anchor (filterNode root)
where
filterNode :: FSNode -> FSNode
filterNode file@(File _) = file
filterNode (Dir path items) =
filter cond items & map filterNode & Dir path
readDirectory :: LocalPath -> IO AnchoredFSNode
readDirectory root = mkNode (Path []) >>= return . AnchoredFSNode root
where
mkNode :: Path -> IO FSNode
mkNode path =
(doesDirectoryExist $ localPath (root /> path))
>>= bool (mkFileNode path) (mkDirNode path)
mkFileNode :: Path -> IO FSNode
mkFileNode path = return $ File path
mkDirNode :: Path -> IO FSNode
mkDirNode path =
(listDirectory $ localPath (root /> path))
>>= mapM (mkNode . ((</) path))
>>= return . Dir path
ensureParentDir :: (FileName -> a -> IO b) -> FileName -> a -> IO b
ensureParentDir writer filePath a =
createDirectoryIfMissing True parentDir
>> writer filePath a
where
parentDir = System.FilePath.dropFileName filePath
remove :: FileName -> IO ()
remove path =
do
putStrLn $ "Removing:\t" ++ path
removePathForcibly path
isOutdated :: Bool -> FilePath -> FilePath -> IO Bool
isOutdated onMissingTarget ref target =
do
refExists <- doesPathExist ref
targetExists <- doesPathExist target
if refExists && targetExists then
do
refTime <- getModificationTime ref
targetTime <- getModificationTime target
return (targetTime < refTime)
else
return onMissingTarget
|