API change: use PandocError for exceptions in Lua subsystem

The PandocError type is used throughout the Lua subsystem, all Lua
functions throw an exception of this type if an error occurs. The
`LuaException` type is removed and no longer exported from
`Text.Pandoc.Lua`. In its place, a new constructor `PandocLuaError` is
added to PandocError.

2 files changed, 11 insertions, 11 deletions

diff --git a/test/Tests/Lua.hs b/test/Tests/Lua.hs
index 0943b17aa..14800f7bb 100644
--- a/test/Tests/Lua.hs
+++ b/test/Tests/Lua.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 {- |
    Module      : Tests.Lua
    Copyright   : © 2017-2020 Albert Krewinkel
@@ -28,11 +29,13 @@ import Text.Pandoc.Builder (bulletList, definitionList, displayMath, divWith,
 import Text.Pandoc.Class (runIOorExplode, setUserDataDir)
 import Text.Pandoc.Definition (Block (BlockQuote, Div, Para), Inline (Emph, Str),
                                Attr, Meta, Pandoc, pandocTypesVersion)
+import Text.Pandoc.Error (PandocError (PandocLuaError))
 import Text.Pandoc.Filter (Filter (LuaFilter), applyFilters)
 import Text.Pandoc.Lua (runLua)
 import Text.Pandoc.Options (def)
 import Text.Pandoc.Shared (pandocVersion)
 
+import qualified Control.Monad.Catch as Catch
 import qualified Foreign.Lua as Lua
 import qualified Data.Text as T
 import qualified Data.Text.Encoding as TE
@@ -197,12 +200,13 @@ tests = map (localOption (QuickCheckTests 20))
 
   , testCase "informative error messages" . runLuaTest $ do
       Lua.pushboolean True
-      err <- Lua.peekEither Lua.stackTop
-      case (err :: Either String Pandoc) of
-        Left msg -> do
+      eitherPandoc <- Catch.try (Lua.peek Lua.stackTop :: Lua.Lua Pandoc)
+      case eitherPandoc of
+        Left (PandocLuaError msg) -> do
           let expectedMsg = "Could not get Pandoc value: "
                             <> "table expected, got boolean"
           Lua.liftIO $ assertEqual "unexpected error message" expectedMsg msg
+        Left e -> error ("Expected a Lua error, but got " <> show e)
         Right _ -> error "Getting a Pandoc element from a bool should fail."
   ]
 
@@ -223,10 +227,7 @@ roundtripEqual x = (x ==) <$> roundtripped
     size <- Lua.gettop
     when (size - oldSize /= 1) $
       error ("not exactly one additional element on the stack: " ++ show size)
-    res <- Lua.peekEither (-1)
-    case res of
-      Left e -> error (show e)
-      Right y -> return y
+    Lua.peek (-1)
 
 runLuaTest :: Lua.Lua a -> IO a
 runLuaTest op = runIOorExplode $ do
diff --git a/test/lua/module/pandoc-types.lua b/test/lua/module/pandoc-types.lua
index 880dd567e..d4e063a5c 100644
--- a/test/lua/module/pandoc-types.lua
+++ b/test/lua/module/pandoc-types.lua
@@ -26,10 +26,9 @@ return {
         )
       end),
       test('non-version string is rejected', function ()
-        assert.error_matches(
-          function () Version '11friends' end,
-          '11friends'
-        )
+        local success, msg = pcall(function () Version '11friends' end)
+        assert.is_falsy(success)
+        assert.is_truthy(tostring(msg):match('11friends'))
       end)
     },