45 lines
1.8 KiB
Haskell
45 lines
1.8 KiB
Haskell
module Hakyll.Preview.Poll
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( previewPoll
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) where
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--------------------------------------------------------------------------------
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import Control.Monad (void)
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import Data.List (isPrefixOf)
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import Filesystem.Path.CurrentOS (decodeString, encodeString)
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import System.Directory (canonicalizePath)
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import System.FSNotify (startManagerConf, watchTree,
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Event(..), WatchConfig(..))
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import System.IO.Error (catchIOError)
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--------------------------------------------------------------------------------
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import Hakyll.Core.Configuration
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--------------------------------------------------------------------------------
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-- | A preview thread that recompiles the site when files change.
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previewPoll :: Configuration -- ^ Configuration
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-> IO [FilePath] -- ^ Updating action
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-> IO () -- ^ Can block forever
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previewPoll conf update = do
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_ <- update
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manager <- startManagerConf (Debounce 0.1)
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ignore <- mapM getPath [destinationDirectory, storeDirectory, tmpDirectory]
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watchTree manager path (predicate ignore) (\_ -> void update)
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where
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path = decodeString $ providerDirectory conf
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getPath fn = catchIOError (canonicalizePath $ fn conf)
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(const $ return $ fn conf)
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predicate ignore evt
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| isRemove evt = False
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| any (flip isPrefixOf $ eventPath evt) ignore == True = False
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| otherwise = not $ shouldIgnoreFile conf (eventPath evt)
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eventPath :: Event -> FilePath
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eventPath (Added p _) = encodeString p
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eventPath (Modified p _) = encodeString p
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eventPath (Removed p _) = encodeString p
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isRemove :: Event -> Bool
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isRemove (Removed _ _) = True
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isRemove _ = False
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