[API Change] Extract Lua code into new package pandoc-lua-engine

The flag 'lua53` must now be used with that package if pandoc is to be
compiled against Lua 5.3.

1 files changed, 20 insertions, 0 deletions

diff --git a/pandoc-lua-engine/test/lua/metatable-catch-all.lua b/pandoc-lua-engine/test/lua/metatable-catch-all.lua
new file mode 100644
index 000000000..05df16bbf
--- /dev/null
+++ b/pandoc-lua-engine/test/lua/metatable-catch-all.lua
@@ -0,0 +1,20 @@
+local num_inlines = 0
+
+function catch_all(el)
+  if el.tag and pandoc.Inline.constructor[el.tag] then
+    num_inlines = num_inlines + 1
+  end
+end
+
+function Pandoc(blocks, meta)
+  return pandoc.Pandoc {
+    pandoc.Para{pandoc.Str(num_inlines)}
+  }
+end
+
+return {
+  setmetatable(
+    {Pandoc = Pandoc},
+    {__index = function(_) return catch_all end}
+  )
+}