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diff --git a/src/Text/Pandoc/Filter/Lua.hs b/src/Text/Pandoc/Filter/Lua.hs
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+++ b/src/Text/Pandoc/Filter/Lua.hs
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+{-
+Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+-}
+
+{- |
+   Module      : Text.Pandoc.Filter.Lua
+   Copyright   : Copyright (C) 2006-2018 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley@edu>
+   Stability   : alpha
+   Portability : portable
+
+Apply Lua filters to modify a pandoc documents programmatically.
+-}
+module Text.Pandoc.Filter.Lua (apply) where
+
+import Control.Exception (throw)
+import Text.Pandoc.Class (PandocIO)
+import Text.Pandoc.Definition (Pandoc)
+import Text.Pandoc.Error (PandocError (PandocFilterError))
+import Text.Pandoc.Filter.Path (expandFilterPath)
+import Text.Pandoc.Lua (LuaException (..), runLuaFilter)
+import Text.Pandoc.Options (ReaderOptions)
+
+apply :: ReaderOptions
+      -> [String]
+      -> FilePath
+      -> Pandoc
+      -> PandocIO Pandoc
+apply ropts args f d = do
+  f' <- expandFilterPath f
+  let format = case args of
+                 (x:_) -> x
+                 _     -> error "Format not supplied for lua filter"
+  res <- runLuaFilter ropts f' format d
+  case res of
+    Right x               -> return x
+    Left (LuaException s) -> throw (PandocFilterError f s)