can underline bits of .lang

langfilter/langfilter.hs

@@ -1,4 +1,3 @@
-{-# OPTIONS_GHC -fdefer-typed-holes #-}
 import Text.Pandoc.Definition
 import Text.Pandoc.JSON
 import Text.Pandoc.Builder
@@ -9,11 +8,10 @@ import Data.Text (Text)
 import qualified Data.Text as Text
 
 main :: IO ()
-main = toJSONFilter filter where
+main = toJSONFilter (filter :: Pandoc -> Pandoc) where
-  filter :: Pandoc -> Pandoc
   filter =
-    walk spans .
     walk (concatMap makeFigures) .
+    walk spans .
     walk (concatMap glosses)
 
 spans :: Inline -> Inline
@@ -29,12 +27,20 @@ spans = \case
 ipaB, ipaN, lang, abbr :: Text -> Inline
 ipaB = Span (cls ["ipa", "ipa-broad"])  . text'
 ipaN = Span (cls ["ipa", "ipa-narrow"]) . text'
-lang = Span (cls ["lang"])              . text'
+lang = Span (cls ["lang"])              . lang'
 abbr = Span (cls ["abbr"])              . text' . endash
 
 text' :: Text -> [Inline]
 text' = toList . text
 
+lang' :: Text -> [Inline]
+lang' txt = case Text.uncons txt of
+  Nothing          -> []
+  Just ('{', txt') -> RawInline "html" "<u>"  : lang' txt'
+  Just ('}', txt') -> RawInline "html" "</u>" : lang' txt'
+  _                -> Str a : lang' b
+    where (a, b) = Text.span (\c -> c /= '{' && c /= '}') txt
+
 cls :: [Text] -> Attr
 cls cs = ("", cs, [])
 

style/page.css

@@ -180,6 +180,10 @@ dd {
   break-before: avoid;
 }
 
+u u {
+  text-decoration: double underline;
+}
+
 .twocol {
   columns: 2;
 }