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{-# LANGUAGE NoImplicitPrelude #-}
{-
Copyright (C) 2006-2019 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) 2006-2019 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 Prelude
import Control.Exception (throw)
import Control.Monad ((>=>))
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition (Pandoc)
import Text.Pandoc.Error (PandocError (PandocFilterError))
import Text.Pandoc.Lua (Global (..), LuaException (..),
runLua, runFilterFile, setGlobals)
import Text.Pandoc.Options (ReaderOptions)
-- | Run the Lua filter in @filterPath@ for a transformation to the
-- target format (first element in args). Pandoc uses Lua init files to
-- setup the Lua interpreter.
apply :: ReaderOptions
-> [String]
-> FilePath
-> Pandoc
-> PandocIO Pandoc
apply ropts args fp doc = do
let format = case args of
(x:_) -> x
_ -> error "Format not supplied for Lua filter"
runLua >=> forceResult fp $ do
setGlobals [ FORMAT format
, PANDOC_READER_OPTIONS ropts
, PANDOC_SCRIPT_FILE fp
]
runFilterFile fp doc
forceResult :: FilePath -> Either LuaException Pandoc -> PandocIO Pandoc
forceResult fp eitherResult = case eitherResult of
Right x -> return x
Left (LuaException s) -> throw (PandocFilterError fp s)
|
