Options.WriterOptions: Change type of writerVariables to Context Text.

This will allow structured values.

[API change]

2 files changed, 32 insertions, 0 deletions

diff --git a/src/Text/Pandoc/Lua/Marshaling.hs b/src/Text/Pandoc/Lua/Marshaling.hs
index 8a1270ab7..c37f22b8d 100644
--- a/src/Text/Pandoc/Lua/Marshaling.hs
+++ b/src/Text/Pandoc/Lua/Marshaling.hs
@@ -14,4 +14,5 @@ module Text.Pandoc.Lua.Marshaling () where
 import Text.Pandoc.Lua.Marshaling.AST ()
 import Text.Pandoc.Lua.Marshaling.CommonState ()
 import Text.Pandoc.Lua.Marshaling.ReaderOptions ()
+import Text.Pandoc.Lua.Marshaling.Context ()
 import Text.Pandoc.Lua.Marshaling.Version ()
diff --git a/src/Text/Pandoc/Lua/Marshaling/Context.hs b/src/Text/Pandoc/Lua/Marshaling/Context.hs
new file mode 100644
index 000000000..a9cc7f38e
--- /dev/null
+++ b/src/Text/Pandoc/Lua/Marshaling/Context.hs
@@ -0,0 +1,31 @@
+{-# LANGUAGE NoImplicitPrelude    #-}
+{-# LANGUAGE FlexibleInstances    #-}
+{-# LANGUAGE ScopedTypeVariables  #-}
+{-# LANGUAGE LambdaCase           #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{- |
+   Module      : Text.Pandoc.Lua.Marshaling.Context
+   Copyright   : © 2012-2019 John MacFarlane
+                 © 2017-2019 Albert Krewinkel
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
+   Stability   : alpha
+
+Marshaling instance for doctemplates Context and its components.
+-}
+module Text.Pandoc.Lua.Marshaling.Context () where
+
+import qualified Foreign.Lua as Lua
+import Foreign.Lua (Pushable)
+import Text.DocTemplates (Context(..), Val(..))
+
+instance Pushable a => Pushable (Context a) where
+  push (Context m) = Lua.push m
+
+instance Pushable a => Pushable (Val a) where
+  push NullVal = Lua.push ()
+  push (MapVal ctx) = Lua.push ctx
+  push (ListVal xs) = Lua.push xs
+  push (SimpleVal x) = Lua.push x
+