Lua: use more natural representation for Reference values

Omit `false` boolean values, push integers as numbers.

src/Text/Pandoc/Lua/Marshal/Reference.hs

@@ -55,14 +55,21 @@ pushName = pushAsTable
   , ("non-dropping-particle" , pushTextOrNil . nameNonDroppingParticle)
   , ("suffix"                , pushTextOrNil . nameSuffix)
   , ("literal"               , pushTextOrNil . nameLiteral)
-  , ("comma-suffix"          , pushBool . nameCommaSuffix)
-  , ("static-ordering"       , pushBool . nameStaticOrdering)
+  , ("comma-suffix"          , pushBoolOrNil . nameCommaSuffix)
+  , ("static-ordering"       , pushBoolOrNil . nameStaticOrdering)
   ]
   where
     pushTextOrNil = \case
       Nothing -> pushnil
       Just xs -> pushText xs
 
+-- | Pushes a boolean, but uses @nil@ instead of @false@; table fields
+-- are not set unless the value is true.
+pushBoolOrNil :: Pusher e Bool
+pushBoolOrNil = \case
+  False -> pushnil
+  True  -> pushBool True
+
 -- | Pushes a 'Variable' as string.
 pushVariable :: Pusher e Variable
 pushVariable = pushText . fromVariable
@@ -80,14 +87,13 @@ pushVal = \case
 pushDate :: LuaError e => Pusher e Date
 pushDate = pushAsTable
   [ ("date-parts", pushPandocList pushDateParts . dateParts)
-  , ("circa", pushBool . dateCirca)
+  , ("circa", pushBoolOrNil . dateCirca)
   , ("season", maybe pushnil pushIntegral . dateSeason)
   , ("literal", maybe pushnil pushText . dateLiteral)
   ]
  where
-   -- date parts are integers, but we push them as strings, as meta
-   -- values can't handle integers yet.
-   pushDateParts (DateParts dp) = pushPandocList (pushString . show) dp
+   -- date parts are lists of Int values
+   pushDateParts (DateParts dp) = pushPandocList pushIntegral dp
 
 -- | Helper funtion to push an object as a table.
 pushAsTable :: LuaError e

test/Tests/Lua/Module.hs

@@ -29,7 +29,7 @@ tests =
                   ("lua" </> "module" </> "pandoc-path.lua")
   , testPandocLua "pandoc.types"
                   ("lua" </> "module" </> "pandoc-types.lua")
-  , testPandocLua "pandoc.util"
+  , testPandocLua "pandoc.utils"
                   ("lua" </> "module" </> "pandoc-utils.lua")
   ]
 

test/lua/module/pandoc-utils.lua

@@ -62,6 +62,31 @@ return {
     end),
   },
 
+  group 'references' {
+    test('gets references from doc', function ()
+      local ref = {
+        ['author'] = {
+          {given = 'Max', family = 'Mustermann'}
+        },
+        ['container-title'] = pandoc.Inlines('JOSS'),
+        ['id']     = 'test',
+        ['issued'] = {['date-parts'] = {{2021}}},
+        ['title']  = pandoc.Inlines{
+          pandoc.Quoted('DoubleQuote', 'Interesting'),
+          pandoc.Space(),
+          'work'
+        },
+        ['type']   = 'article-journal',
+      }
+      local nocite = pandoc.Cite(
+        '@test',
+        {pandoc.Citation('test', 'NormalCitation')}
+      )
+      local doc = pandoc.Pandoc({}, {nocite = nocite, references = {ref}})
+      assert.are_same({ref}, pandoc.utils.references(doc))
+    end)
+  },
+
   group 'sha1' {
     test('hashing', function ()
       local ref_hash = '0a0a9f2a6772942557ab5355d76af442f8f65e01'