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-rw-r--r--src/Hakyll/Web/Preview/Interval.hs36
1 files changed, 36 insertions, 0 deletions
diff --git a/src/Hakyll/Web/Preview/Interval.hs b/src/Hakyll/Web/Preview/Interval.hs
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+++ b/src/Hakyll/Web/Preview/Interval.hs
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+-- | Interval-based implementation of preview polling, for the platforms which
+-- are not supported by inotify.
+--
+module Hakyll.Web.Preview.Interval
+ ( previewPoll
+ ) where
+
+import Control.Applicative ((<$>))
+import Control.Concurrent (threadDelay)
+import Control.Monad (when)
+import System.Time (getClockTime)
+import Data.Set (Set)
+import qualified Data.Set as S
+import System.Directory (getModificationTime)
+
+import Hakyll.Core.Configuration
+import Hakyll.Core.Identifier
+import Hakyll.Core.ResourceProvider
+
+-- | A preview thread that periodically recompiles the site.
+--
+previewPoll :: HakyllConfiguration -- ^ Configuration
+ -> Set Resource -- ^ Resources to watch
+ -> IO () -- ^ Action called when something changes
+ -> IO () -- ^ Can block forever
+previewPoll _ resources callback = do
+ let files = map (toFilePath . unResource) $ S.toList resources
+ time <- getClockTime
+ loop files time
+ where
+ delay = 1000000
+ loop files time = do
+ threadDelay delay
+ modified <- any (time <) <$> mapM getModificationTime files
+ when modified callback
+ loop files =<< getClockTime