2 files changed, 6 insertions, 6 deletions

diff --git a/compiler/src/Caching.hs b/compiler/src/Caching.hs
index c2b5a43..1a8b710 100644
--- a/compiler/src/Caching.hs
+++ b/compiler/src/Caching.hs
@@ -53,7 +53,7 @@ buildItemCache cachedItems = lookupCache
     cachedMap = Map.fromList (map withKey cachedItemList)
     lookupCache path = Map.lookup (webPath path) cachedMap
 
-useCached :: ItemCache -> (GalleryItem -> a) -> Cache a
+useCached :: ItemCache -> (GalleryItem -> Maybe a) -> Cache a
 useCached cache propGetter processor itemPath resPath inputFsPath outputFsPath =
   do
     isDir <- doesDirectoryExist outputFsPath
@@ -63,7 +63,7 @@ useCached cache propGetter processor itemPath resPath inputFsPath outputFsPath =
     if fileExists then
       do
         needUpdate <- isOutdated True inputFsPath outputFsPath
-        case (needUpdate, cache itemPath) of
+        case (needUpdate, cache itemPath >>= propGetter) of
           (False, Just props) -> fromCache props
           _ -> update
     else
@@ -73,4 +73,4 @@ useCached cache propGetter processor itemPath resPath inputFsPath outputFsPath =
     update = processor itemPath resPath inputFsPath outputFsPath
     fromCache props =
       putStrLn ("From cache:\t" ++ outputFsPath)
-      >> return (propGetter props)
+      >> return props
diff --git a/compiler/src/Compiler.hs b/compiler/src/Compiler.hs
index 1ec55c5..4111f02 100644
--- a/compiler/src/Compiler.hs
+++ b/compiler/src/Compiler.hs
@@ -147,8 +147,8 @@ compileGallery configPath inputDirPath outputDirPath outputIndexPath excludedDir
     cachedIndex <- loadCachedIndex galleryIndexPath
     let cache = mkCache cachedIndex
 
-    let itemProc = itemProcessor config (cache Resource.properties)
-    let thumbnailProc = thumbnailProcessor config (cache Resource.thumbnail)
+    let itemProc = itemProcessor config (cache $ return . Resource.properties)
+    let thumbnailProc = thumbnailProcessor config (cache $ fmap return . Resource.thumbnail)
     let galleryBuilder = buildGalleryTree itemProc thumbnailProc (tagsFromDirectories config)
     resources <- galleryBuilder curatedInputTree
 
@@ -170,7 +170,7 @@ compileGallery configPath inputDirPath outputDirPath outputIndexPath excludedDir
         then return Nothing
         else loadGalleryIndex galleryIndexPath
 
-    mkCache :: Maybe GalleryIndex -> (GalleryItem -> a) -> Cache a
+    mkCache :: Maybe GalleryIndex -> (GalleryItem -> Maybe a) -> Cache a
     mkCache refGalleryIndex =
       if rebuildAll
         then const noCache