{-# LANGUAGE NoImplicitPrelude #-}
{-
Copyright (C) 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.Groff
   Copyright   : Copyright (C) 2018 John MacFarlane
   License     : GNU GPL, version 2 or above

   Maintainer  : John MacFarlane <jgm@berkeley.edu>
   Stability   : alpha
   Portability : portable

Shared functions for escaping and formatting groff.
-}
module Text.Pandoc.Groff ( groffEscape )
where

import Prelude
import Data.Char (isAscii, ord)
import qualified Data.Text as T
import Text.Printf (printf)

groffEscape :: T.Text -> T.Text
groffEscape = T.concatMap toUchar
  where toUchar c
         | isAscii c = T.singleton c
         | otherwise = T.pack $ printf "\\[u%04X]" (ord c)