support for no background at all

make-pages/GalleryPage.hs

@@ -176,4 +176,4 @@ makeItem nsfw file info@(Info {bg}) = [b|@0
   date'    = formatShort date
   year'    = #year date
   updated' = if #updated info nsfw then [b|true|] else [b|false|]
-  bgStyle  = ifJust bg \col -> [b| style="background: $col"|]
+  bgStyle  = case bg of Other col -> [b| style="background: $col"|]; _ -> ""

make-pages/Info.hs

@@ -1,9 +1,11 @@
+{-# OPTIONS_GHC -fdefer-typed-holes #-}
+
 {-# OPTIONS_GHC -Wno-orphans #-}
 module Info
   (Info (..),
    tagsFor, descFor, imagesFor, linksFor, updatesFor, compareFor, sortFor,
    Artist (..), Images' (..), Images, Image (..), Desc (..), DescField (..),
-   Link (..), Update (..),
+   Link (..), Update (..), Bg (..),
    GalleryInfo (..), GalleryFilters (..), ArtistFilter (..), NsfwFilter (..),
    IndexInfo (..),
    readArtistFilter, matchArtist, readNsfwFilter, matchNsfw, matchFilters,
@@ -57,7 +59,7 @@ data Info =
     nsfwTags     :: ![Text],
     desc         :: !Desc,
     nsfwDesc     :: !Desc,
-    bg           :: !(Maybe Text),
+    bg           :: !Bg,
     images       :: !Images,
     thumb'       :: !(Maybe FilePath),
     links        :: ![Link],
@@ -65,6 +67,9 @@ data Info =
   }
   deriving (Eq, Show)
 
+data Bg = Default | NoBorder | Other !Text
+  deriving (Eq, Show)
+
 data Desc =
     NoDesc
   | TextDesc !Text
@@ -279,12 +284,18 @@ instance FromYAML Info where
          <*>  m .:? "nsfw-tags" .!= []
          <*>  m .:? "desc"      .!= NoDesc
          <*>  m .:? "nsfw-desc" .!= NoDesc
-         <*>  m .:? "bg"
+         <*>  m .:? "bg"        .!= Default
          <*>  m .:  "images"
          <*>  m .:? "thumb"
          <*>  m .:? "links"  .!= []
          <*>  m .:? "extras" .!= []
 
+instance FromYAML Bg where
+  parseYAML y =
+        YAML.withNull "default value" (pure Default) y
+    <|> YAML.withStr "css <image> or \"noborder\""
+          (\str -> pure if str == "noborder" then NoBorder else Other str) y
+
 instance FromYAML Artist where
   parseYAML y = justName y <|> withUrl y where
     justName = YAML.withStr "name" \name -> pure $ Artist {name, url = Nothing}

make-pages/SinglePage.hs

@@ -84,7 +84,18 @@ make' root siteName prefix nsfw _dataDir dir
         | otherwise                 = mempty
   let warningT = makeWarning [b|.|]
 
-  let bgStyle = ifJust bg \col -> [b|@0
+  let bgStyle = case bg of
+        Default  -> ""
+        NoBorder -> [b|@0
+          <style>
+            #mainfig {
+              background: transparent;
+              border: none;
+              box-shadow: none;
+            }
+          </style>
+        |]
+        Other col -> [b|@0
           <style> #mainfig { background: $col; } </style>
         |]