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module Hakyll.Preview.Poll
( watchUpdates
) where
--------------------------------------------------------------------------------
import Filesystem.Path.CurrentOS (decodeString, encodeString)
import System.FSNotify (startManagerConf, watchTree,
Event(..), WatchConfig(..))
--------------------------------------------------------------------------------
import Hakyll.Core.Configuration
--------------------------------------------------------------------------------
-- | A thread that watches for updates in a 'providerDirectory' and recompiles
-- a site as soon as any changes occur
watchUpdates :: Configuration -> IO () -> IO ()
watchUpdates conf update = do
_ <- update
manager <- startManagerConf (Debounce 0.1)
watchTree manager path (not . isRemove) update'
where
path = decodeString $ providerDirectory conf
update' evt = do
ignore <- shouldIgnoreFile conf $ eventPath evt
if ignore then return () else update
eventPath :: Event -> FilePath
eventPath evt = encodeString $ evtPath evt
where
evtPath (Added p _) = p
evtPath (Modified p _) = p
evtPath (Removed p _) = p
isRemove :: Event -> Bool
isRemove (Removed _ _) = True
isRemove _ = False
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