87 lines
3.3 KiB
Haskell
87 lines
3.3 KiB
Haskell
-- | A module containing various file utility functions
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--
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module Hakyll.Core.Util.File
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( makeDirectories
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, getRecursiveContents
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, isFileObsolete
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, isFileInternal
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) where
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import System.Time (ClockTime)
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import Control.Monad (forM, filterM)
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import Data.List (isPrefixOf)
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import System.Directory ( createDirectoryIfMissing, doesDirectoryExist
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, doesFileExist, getModificationTime
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, getDirectoryContents
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)
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import System.FilePath ( normalise, takeDirectory, splitPath
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, dropTrailingPathSeparator, (</>)
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)
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import Hakyll.Core.Configuration
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-- | Given a path to a file, try to make the path writable by making
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-- all directories on the path.
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--
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makeDirectories :: FilePath -> IO ()
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makeDirectories = createDirectoryIfMissing True . takeDirectory
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-- | Get all contents of a directory. Note that files starting with a dot (.)
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-- will be ignored.
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--
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getRecursiveContents :: FilePath -> IO [FilePath]
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getRecursiveContents topdir = do
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topdirExists <- doesDirectoryExist topdir
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if topdirExists
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then do names <- getDirectoryContents topdir
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let properNames = filter isProper names
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paths <- forM properNames $ \name -> do
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let path = topdir </> name
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isDirectory <- doesDirectoryExist path
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if isDirectory
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then getRecursiveContents path
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else return [normalise path]
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return (concat paths)
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else return []
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where
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isProper = not . (== ".") . take 1
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-- | Check if a timestamp is obsolete compared to the timestamps of a number of
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-- files. When they are no files, it is never obsolete.
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--
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isObsolete :: ClockTime -- ^ The time to check.
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-> [FilePath] -- ^ Dependencies of the cached file.
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-> IO Bool
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isObsolete _ [] = return False
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isObsolete timeStamp depends = do
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depends' <- filterM doesFileExist depends
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dependsModified <- mapM getModificationTime depends'
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return (timeStamp < maximum dependsModified)
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-- | Check if a file is obsolete, given it's dependencies. When the file does
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-- not exist, it is always obsolete. Other wise, it is obsolete if any of it's
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-- dependencies has a more recent modification time than the file.
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--
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isFileObsolete :: FilePath -- ^ The cached file
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-> [FilePath] -- ^ Dependencies of the cached file
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-> IO Bool
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isFileObsolete file depends = do
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exists <- doesFileExist file
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if not exists
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then return True
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else do timeStamp <- getModificationTime file
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isObsolete timeStamp depends
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-- | Check if a file is meant for Hakyll internal use, i.e. if it is located in
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-- the destination or store directory
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--
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isFileInternal :: HakyllConfiguration -- ^ Configuration
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-> FilePath -- ^ File to check
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-> Bool -- ^ If the given file is internal
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isFileInternal configuration file =
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any (`isPrefixOf` split file) dirs
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where
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split = map dropTrailingPathSeparator . splitPath
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dirs = map (split . ($ configuration)) [ destinationDirectory
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, storeDirectory
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]
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