2 files changed, 10 insertions, 4 deletions

diff --git a/compiler/ldgallery.1.md b/compiler/ldgallery.1.md
index 3c52f9d..4f9935b 100644
--- a/compiler/ldgallery.1.md
+++ b/compiler/ldgallery.1.md
@@ -107,7 +107,7 @@ description
 
 tags
 : List of tags for the item.
-  Tag groups can be defined using prefixes separated by ":" (colon).
+  Tag categories can be defined using prefixes separated by ":" (colon).
   Tags specified in a directory metadata sidecar are applied to all items within that directory.
 
 
@@ -139,6 +139,10 @@ excludedTags[]
 : Glob patterns of tags to exclude from the gallery.
   Defaults to [] (none).
 
+tagCategories[]
+: Top-level tag categories.
+  Defaults to [] (none).
+
 tagsFromDirectories.fromParents
 : Automatically generate tags from the name of parent directories,
   looking up in the hierarchy as far as indicated by this parameter.
diff --git a/compiler/src/Config.hs b/compiler/src/Config.hs
index 8796c3c..0ae0fa1 100644
--- a/compiler/src/Config.hs
+++ b/compiler/src/Config.hs
@@ -57,6 +57,7 @@ data GalleryConfig = GalleryConfig
   , excludedFiles :: [String]
   , includedTags :: [String]
   , excludedTags :: [String]
+  , tagCategories :: [String]
   , tagsFromDirectories :: TagsFromDirectoriesConfig
   , thumbnailMaxResolution :: Resolution
   , pictureMaxResolution :: Maybe Resolution
@@ -71,6 +72,7 @@ instance FromJSON GalleryConfig where
     <*> v .:? "excludedFiles" .!= []
     <*> v .:? "includedTags" .!= ["*"]
     <*> v .:? "excludedTags" .!= []
+    <*> v .:? "tagCategories" .!= []
     <*> v .:? "tagsFromDirectories" .!= (TagsFromDirectoriesConfig 0 "")
     <*> v .:? "thumbnailMaxResolution" .!= (Resolution 400 300)
     <*> v .:? "pictureMaxResolution"
@@ -80,9 +82,9 @@ readConfig = decodeYamlFile
 
 
 data ViewerConfig = ViewerConfig
-  { -- TODO: add viewer config keys (tag groups...)
-    galleryTitle :: String
+  { galleryTitle :: String
+  , tagCategories :: [String]
   } deriving (Generic, ToJSON, Show)
 
 viewerConfig :: GalleryConfig -> ViewerConfig
-viewerConfig GalleryConfig{galleryTitle} = ViewerConfig galleryTitle
+viewerConfig GalleryConfig{galleryTitle, tagCategories} = ViewerConfig galleryTitle tagCategories