4 files changed, 62 insertions, 38 deletions

diff --git a/compiler/src/Config.hs b/compiler/src/Config.hs
index 4826f17..bf5a28e 100644
--- a/compiler/src/Config.hs
+++ b/compiler/src/Config.hs
@@ -19,17 +19,24 @@
 module Config
   ( GalleryConfig(..)
   , CompilerConfig(..)
+  , TagsFromDirectoriesConfig(..)
+  , Resolution(..)
   , readConfig
   ) where
 
 
 import GHC.Generics (Generic)
-import Data.Aeson (FromJSON, withObject, (.:?), (.!=))
+import Data.Aeson (ToJSON, FromJSON, withObject, (.:?), (.!=))
 import qualified Data.Aeson as JSON
 
 import Files (FileName)
 import Input (decodeYamlFile)
-import Resource (Resolution(..))
+
+
+data Resolution = Resolution
+  { width :: Int
+  , height :: Int
+  } deriving (Generic, Show, ToJSON, FromJSON)
 
 
 data CompilerConfig = CompilerConfig
@@ -37,7 +44,7 @@ data CompilerConfig = CompilerConfig
   , excludedDirectories :: [String]
   , includedFiles :: [String]
   , excludedFiles :: [String]
-  , tagsFromDirectories :: Int
+  , tagsFromDirectories :: TagsFromDirectoriesConfig
   , thumbnailMaxResolution :: Resolution
   , pictureMaxResolution :: Maybe Resolution
   } deriving (Generic, Show)
@@ -48,11 +55,22 @@ instance FromJSON CompilerConfig where
     <*> v .:? "excludedDirectories" .!= []
     <*> v .:? "includedFiles" .!= ["*"]
     <*> v .:? "excludedFiles" .!= []
-    <*> v .:? "tagsFromDirectories" .!= 0
+    <*> v .:? "tagsFromDirectories" .!= (TagsFromDirectoriesConfig 0 "")
     <*> v .:? "thumbnailMaxResolution" .!= (Resolution 400 300)
     <*> v .:? "pictureMaxResolution"
 
 
+data TagsFromDirectoriesConfig = TagsFromDirectoriesConfig
+  { fromParents :: Int
+  , prefix :: String
+  } deriving (Generic, Show)
+
+instance FromJSON TagsFromDirectoriesConfig where
+  parseJSON = withObject "TagsFromDirectoriesConfig" $ \v -> TagsFromDirectoriesConfig
+    <$> v .:? "fromParents" .!= 0
+    <*> v .:? "prefix" .!= ""
+
+
 data GalleryConfig = GalleryConfig
   { compiler :: CompilerConfig
   , viewer :: JSON.Object
diff --git a/compiler/src/Resource.hs b/compiler/src/Resource.hs
index aadf60b..b2a6bbf 100644
--- a/compiler/src/Resource.hs
+++ b/compiler/src/Resource.hs
@@ -27,7 +27,7 @@ import Control.Concurrent.ParallelIO.Global (parallel)
 import Data.List (sortOn)
 import Data.List.Ordered (minusBy)
 import Data.Char (toLower)
-import Data.Maybe (mapMaybe, fromMaybe, maybeToList)
+import Data.Maybe (mapMaybe, fromMaybe)
 import Data.Function ((&))
 import qualified Data.Set as Set
 import Data.Text (pack)
@@ -37,10 +37,11 @@ import Data.Time.Format (formatTime, defaultTimeLocale)
 import Safe.Foldable (maximumByMay)
 
 import GHC.Generics (Generic)
-import Data.Aeson (FromJSON, ToJSON, genericToJSON, genericToEncoding)
+import Data.Aeson (ToJSON, genericToJSON, genericToEncoding)
 import qualified Data.Aeson as JSON
 
 import Files
+import Config (Resolution(..), TagsFromDirectoriesConfig(..))
 import Input (InputTree(..), Sidecar(..))
 
 
@@ -57,16 +58,6 @@ encodingOptions = JSON.defaultOptions
 
 type Tag = String
 
-data Resolution = Resolution
-  { width :: Int
-  , height :: Int
-  } deriving (Generic, Show, FromJSON)
-
-instance ToJSON Resolution where
-  toJSON = genericToJSON encodingOptions
-  toEncoding = genericToEncoding encodingOptions
-
-
 data Resource = Resource
   { resourcePath :: Path
   , modTime :: UTCTime
@@ -120,13 +111,13 @@ type ThumbnailProcessor = Path -> IO (Maybe Thumbnail)
 
 
 buildGalleryTree ::
-     ItemProcessor -> ThumbnailProcessor
-  -> Int -> InputTree -> IO GalleryItem
-buildGalleryTree processItem processThumbnail tagsFromDirectories inputTree =
-  mkGalleryItem [] [] inputTree
+     ItemProcessor -> ThumbnailProcessor -> TagsFromDirectoriesConfig
+  -> InputTree -> IO GalleryItem
+buildGalleryTree processItem processThumbnail tagsFromDirsConfig inputTree =
+  mkGalleryItem [] inputTree
   where
-    mkGalleryItem :: [String] -> [Tag] -> InputTree -> IO GalleryItem
-    mkGalleryItem parentDirs inheritedTags InputFile{path, modTime, sidecar} =
+    mkGalleryItem :: [Tag] -> InputTree -> IO GalleryItem
+    mkGalleryItem inheritedTags InputFile{path, modTime, sidecar} =
       do
         properties <- processItem path
         processedThumbnail <- processThumbnail path
@@ -134,23 +125,22 @@ buildGalleryTree processItem processThumbnail tagsFromDirectories inputTree =
           { title = Input.title sidecar ?? fileName path ?? ""
           , datetime = Input.datetime sidecar ?? toZonedTime modTime
           , description = Input.description sidecar ?? ""
-          , tags = unique ((Input.tags sidecar ?? []) ++ inheritedTags ++ parentDirTags parentDirs)
+          , tags = unique ((Input.tags sidecar ?? []) ++ inheritedTags ++ parentDirTags path)
           , path = "/" /> path
           , thumbnail = processedThumbnail
           , properties = properties }
 
-    mkGalleryItem parentDirs inheritedTags InputDir{path, modTime, sidecar, dirThumbnailPath, items} =
+    mkGalleryItem inheritedTags InputDir{path, modTime, sidecar, dirThumbnailPath, items} =
       do
-        let itemsParents = (maybeToList $ fileName path) ++ parentDirs
         let dirTags = (Input.tags sidecar ?? []) ++ inheritedTags
-        processedItems <- parallel $ map (mkGalleryItem itemsParents dirTags) items
+        processedItems <- parallel $ map (mkGalleryItem dirTags) items
         processedThumbnail <- maybeThumbnail dirThumbnailPath
         return GalleryItem
           { title = Input.title sidecar ?? fileName path ?? ""
           , datetime = Input.datetime sidecar ?? mostRecentModTime processedItems
                                               ?? toZonedTime modTime
           , description = Input.description sidecar ?? ""
-          , tags = unique (aggregateTags processedItems ++ parentDirTags parentDirs)
+          , tags = unique (aggregateTags processedItems ++ parentDirTags path)
           , path = "/" /> path
           , thumbnail = processedThumbnail
           , properties = Directory processedItems }
@@ -162,8 +152,11 @@ buildGalleryTree processItem processThumbnail tagsFromDirectories inputTree =
     unique :: Ord a => [a] -> [a]
     unique = Set.toList . Set.fromList
 
-    parentDirTags :: [String] -> [Tag]
-    parentDirTags = take tagsFromDirectories
+    parentDirTags :: Path -> [Tag]
+    parentDirTags (Path elements) =
+        drop 1 elements
+      & take (fromParents tagsFromDirsConfig)
+      & map (prefix tagsFromDirsConfig ++)
 
     aggregateTags :: [GalleryItem] -> [Tag]
     aggregateTags = concatMap (\item -> tags (item::GalleryItem))
diff --git a/example/src/gallery.yaml b/example/src/gallery.yaml
index bef19e0..3408571 100644
--- a/example/src/gallery.yaml
+++ b/example/src/gallery.yaml
@@ -8,7 +8,9 @@ compiler:
   #excludedFiles:
   #- "*.md"
 
-  tagsFromDirectories: 0 # default
+  tagsFromDirectories:
+    fromParents: 0 # default
+    prefix: ""     # default
 
   thumbnailMaxResolution:
     width: 400  # default
diff --git a/ldgallery.1.md b/ldgallery.1.md
index 91724a6..a5d0e4c 100644
--- a/ldgallery.1.md
+++ b/ldgallery.1.md
@@ -107,19 +107,28 @@ tags
 The gallery settings reside in a file named "gallery.yaml" located at the root of the gallery's source directory.
 
 compiler.includedDirectories[]
-: Glob patterns of directory names to include in the gallery.  Defaults to ["*"] (matches all directory names).
+: Glob patterns of directory names to include in the gallery.
+  Defaults to ["*"] (matches all directory names).
 
 compiler.excludedDirectories[]
-: Glob patterns of directory names to exclude from the gallery.  Defaults to [] (none).
+: Glob patterns of directory names to exclude from the gallery.
+  Defaults to [] (none).
 
 compiler.includedFiles[]
-: Glob patterns of file names to include in the gallery.  Defaults to ["*"] (matches all file names).
+: Glob patterns of file names to include in the gallery.
+  Defaults to ["*"] (matches all file names).
 
 compiler.excludedFiles[]
-: Glob patterns of file names to exclude from the gallery.  Defaults to [] (none).
+: Glob patterns of file names to exclude from the gallery.
+  Defaults to [] (none).
 
-compiler.tagsFromDirectories
+compiler.tagsFromD