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diff --git a/src/Text/Pandoc/GroffChar.hs b/src/Text/Pandoc/GroffChar.hs
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+{-# 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.GroffChar
+   Copyright   : Copyright (C) 2007-2018 John MacFarlane
+   License     : GNU GPL, version 2 or above
+
+   Maintainer  : John MacFarlane <jgm@berkeley.edu>
+   Stability   : alpha
+   Portability : portable
+
+Groff character escaping/unescaping.
+-}
+
+module Text.Pandoc.GroffChar (
+    essentialEscapes
+  , characterCodes
+  , combiningAccents
+  ) where
+import Prelude
+import qualified Data.Map as Map
+
+essentialEscapes :: Map.Map Char String
+essentialEscapes = Map.fromList
+  [ ('\160', "\\~")
+  , ('\'', "\\[aq]")
+  , ('`', "\\[ga]")
+  , ('"', "\\[dq]")
+  , ('~', "\\[ti]")
+  , ('^', "\\[ha]")
+  , ('@', "\\[at]")
+  , ('\\', "\\[rs]")
+  , ('\x2026', "\\&...")  -- because u2026 doesn't render on tty
+  , ('\x2212', "\\-")  -- minus
+  ]
+
+characterCodes :: [(Char, String)]
+characterCodes =
+  [ ('Ð', "-D")
+  , ('ð', "Sd")
+  , ('Þ', "TP")
+  , ('þ', "Tp")
+  , ('ß', "ss")
+  , ('ﬀ', "ff")
+  , ('ﬁ', "fi")
+  , ('ﬂ', "fl")
+  , ('ﬃ', "Fi")
+  , ('ﬄ', "Fl")
+  , ('Ł', "/L")
+  , ('ł', "/l")
+  , ('Ø', "/O")
+  , ('ø', "/o")
+  , ('Æ', "AE")
+  , ('æ', "ae")
+  , ('Œ', "OE")
+  , ('œ', "oe")
+  , ('Ĳ', "IJ")
+  , ('ĳ', "ij")
+  , ('ı', ".i")
+  , ('ȷ', ".j")
+  , ('Á', "'A")
+  , ('Ć', "'C")
+  , ('É', "'E")
+  , ('Í', "'I")
+  , ('Ó', "'O")
+  , ('Ú', "'U")
+  , ('Ý', "'Y")
+  , ('á', "'a")
+  , ('ć', "'c")
+  , ('é', "'e")
+  , ('í', "'i")
+  , ('ó', "'o")
+  , ('ú', "'u")
+  , ('ý', "'y")
+  , ('Ä', ":A")
+  , ('Ë', ":E")
+  , ('Ï', ":I")
+  , ('Ö', ":O")
+  , ('Ü', ":U")
+  , ('Ÿ', ":Y")
+  , ('ä', ":a")
+  , ('ë', ":e")
+  , ('ï', ":i")
+  , ('ö', ":o")
+  , ('ü', ":u")
+  , ('ÿ', ":y")
+  , ('Â', "^A")
+  , ('Ê', "^E")
+  , ('Î', "^I")
+  , ('Ô', "^O")
+  , ('Û', "^U")
+  , ('â', "^a")
+  , ('ê', "^e")
+  , ('î', "^i")
+  , ('ô', "^o")
+  , ('û', "^u")
+  , ('À', "`A")
+  , ('È', "`E")
+  , ('Ì', "`I")
+  , ('Ò', "`O")
+  , ('Ù', "`U")
+  , ('à', "`a")
+  , ('è', "`e")
+  , ('ì', "`i")
+  , ('ò', "`o")
+  , ('ù', "`u")
+  , ('Ã', "~A")
+  , ('Ñ', "~N")
+  , ('Õ', "~O")
+  , ('ã', "~a")
+  , ('ñ', "~n")
+  , ('õ', "~o")
+  , ('Š', "vS")
+  , ('š', "vs")
+  , ('Ž', "vZ")
+  , ('ž', "vz")
+  , ('Ç', ",C")
+  , ('ç', ",c")
+  , ('Å', "oA")
+  , ('å', "oa")
+  , ('˝', "a\"")
+  , ('¯', "a-")
+  , ('˙', "a.")
+  , ('^', "a^")
+  , ('´', "aa")
+  , ('`', "ga")
+  , ('˘', "ab")
+  , ('¸', "ac")
+  , ('¨', "ad")
+  , ('ˇ', "ah")
+  , ('˚', "ao")
+  , ('~', "a~")
+  , ('˛', "ho")
+  , ('^', "ha")
+  , ('~', "ti")
+  , ('„', "Bq")
+  , ('‚', "bq")
+  , ('“', "lq")
+  , ('”', "rq")
+  , ('‘', "oq")
+  , ('’', "cq")
+  , ('\'', "aq")
+  , ('"', "dq")
+  , ('«', "Fo")
+  , ('»', "Fc")
+  , ('‹', "fo")
+  , ('›', "fc")
+  , ('¡', "r!")
+  , ('¿', "r?")
+  , ('—', "em")
+  , ('–', "en")
+  , ('‐', "hy")
+  , ('[', "lB")
+  , (']', "rB")
+  , ('{', "lC")
+  , ('}', "rC")
+  , ('⟨', "la")
+  , ('⟩', "ra")
+  , ('⎪', "bv")
+  , ('⎪', "braceex")
+  , ('⎡', "bracketlefttp")
+  , ('⎣', "bracketleftbt")
+  , ('⎢', "bracketleftex")
+  , ('⎤', "bracketrighttp")
+  , ('⎦', "bracketrightbt")
+  , ('⎥', "bracketrightex")
+  , ('╭', "lt")
+  , ('⎧', "bracelefttp")
+  , ('┥', "lk")
+  , ('⎨', "braceleftmid")
+  , ('╰', "lb")
+  , ('⎩', "braceleftbt")
+  , ('⎪', "braceleftex")
+  , ('╮', "rt")
+  , ('⎫', "bracerighttp")
+  , ('┝', "rk")
+  , ('⎬', "bracerightmid")
+  , ('╯', "rb")
+  , ('⎭', "bracerightbt")
+  , ('⎪', "bracerightex")
+  , ('⎛', "parenlefttp")
+  , ('⎝', "parenleftbt")
+  , ('⎜', "parenleftex")
+  , ('⎞', "parenrighttp")
+  , ('⎠', "parenrightbt")
+  , ('⎟', "parenrightex")
+  , ('←', "<-")
+  , ('→', "->")
+  , ('↔', "<>")
+  , ('↓', "da")
+  , ('↑', "ua")
+  , ('↕', "va")
+  , ('⇐', "lA")
+  , ('⇒', "rA")
+  , ('⇔', "hA")
+  , ('⇓', "dA")
+  , ('⇑', "uA")
+  , ('⇕', "vA")
+  , ('⎯', "an")
+  , ('|', "ba")
+  , ('│', "br")
+  , ('_', "ul")
+  , ('‾', "rn")
+  , ('_', "ru")
+  , ('¦', "bb")
+  , ('/', "sl")
+  , ('\\', "rs")
+  , ('○', "ci")
+  , ('·', "bu")
+  , ('‡', "dd")
+  , ('†', "dg")
+  , ('◊', "lz")
+  , ('□', "sq")
+  , ('¶', "ps")
+  , ('§', "sc")
+  , ('☜', "lh")
+  , ('☞', "rh")
+  , ('@', "at")
+  , ('#', "sh")
+  , ('↵', "CR")
+  , ('✓', "OK")
+  , ('©', "co")
+  , ('®', "rg")
+  , ('™', "tm")
+  , ('$', "Do")
+  , ('¢', "ct")
+  , ('€', "eu")
+  , ('€', "Eu")
+  , ('¥', "Ye")
+  , ('£', "Po")
+  , ('¤', "Cs")
+  , ('ƒ', "Fn")
+  , ('°', "de")
+  , ('‰', "%0")
+  , ('′', "fm")
+  , ('″', "sd")
+  , ('µ', "mc")
+  , ('ª', "Of")
+  , ('º', "Om")
+  , ('∧', "AN")
+  , ('∨', "OR")
+  , ('¬', "no")
+  , ('¬', "tno")
+  , ('∃', "te")
+  , ('∀', "fa")
+  , ('∋', "st")
+  , ('∴', "3d")
+  , ('∴', "tf")
+  , ('|', "or")
+  , ('½', "12")
+  , ('¼', "14")
+  , ('¾', "34")
+  , ('⅛', "18")
+  , ('⅜', "38")
+  , ('⅝', "58")
+  , ('⅞', "78")
+  , ('¹', "S1")
+  , ('²', "S2")
+  , ('³', "S3")
+  , ('+', "pl")
+  , ('−', "mi")
+  , ('∓', "-+")
+  , ('±', "+-")
+  , ('±', "t+-")
+  , ('·', "pc")
+  , ('⋅', "md")
+  , ('×', "mu")
+  , ('×', "tmu")
+  , ('⊗', "c*")
+  , ('⊕', "c+")
+  , ('÷', "di")
+  , ('÷', "tdi")
+  , ('⁄', "f/")
+  , ('∗', "**")
+  , ('≤', "<=")
+  , ('≥', ">=")
+  , ('≪', "<<")
+  , ('≫', ">>")
+  , ('=', "eq")
+  , ('≠', "!=")
+  , ('≡', "==")
+  , ('≢', "ne")
+  , ('≅', "=~")
+  , ('≃', "|=")
+  , ('∼', "ap")
+  , ('≈', "~~")
+  , ('≈', "~=")
+  , ('∝', "pt")
+  , ('∅', "es")
+  , ('∈', "mo")
+  , ('∉', "nm")
+  , ('⊂', "sb")
+  , ('⊄', "nb")
+  , ('⊃', "sp")
+  , ('⊅', "nc")
+  , ('⊆', "ib")
+  , ('⊇', "ip")
+  , ('∩', "ca")
+  , ('∪', "cu")
+  , ('∠', "/_")
+  , ('⊥', "pp")
+  , ('∫', "is")
+  , ('∫', "integral")
+  , ('∑', "sum")
+  , ('∏', "product")
+  , ('∐', "coproduct")
+  , ('∇', "gr")
+  , ('√', "sr")
+  , ('√', "sqrt")
+  -- , "radicalex"
+  -- "sqrtex"
+  , ('⌈', "lc")
+  , ('⌉', "rc")
+  , ('⌊', "lf")
+  , ('⌋', "rf")
+  , ('∞', "if")
+  , ('ℵ', "Ah")
+  , ('ℑ', "Im")
+  , ('ℜ', "Re")
+  , ('℘', "wp")
+  , ('∂', "pd")
+  , ('ℏ', "-h")
+  , ('ℏ', "hbar")
+  , ('Α', "*A")
+  , ('Β', "*B")
+  , ('Γ', "*G")
+  , ('Δ', "*D")
+  , ('Ε', "*E")
+  , ('Ζ', "*Z")
+  , ('Η', "*Y")
+  , ('Θ', "*H")
+  , ('Ι', "*I")
+  , ('Κ', "*K")
+  , ('Λ', "*L")
+  , ('Μ', "*M")
+  , ('Ν', "*N")
+  , ('Ξ', "*C")
+  , ('Ο', "*O")
+  , ('Π', "*P")
+  , ('Ρ', "*R")
+  , ('Σ', "*S")
+  , ('Τ', "*T")
+  , ('Υ', "*U")
+  , ('Φ', "*F")
+  , ('Χ', "*X")
+  , ('Ψ', "*Q")
+  , ('Ω', "*W")
+  , ('α', "*a")
+  , ('β', "*b")
+  , ('γ', "*g")
+  , ('δ', "*d")
+  , ('ε', "*e")
+  , ('ζ', "*z")
+  , ('η', "*y")
+  , ('θ', "*h")
+  , ('ι', "*i")
+  , ('κ', "*k")
+  , ('λ', "*l")
+  , ('μ', "*m")
+  , ('ν', "*n")
+  , ('ξ', "*c")
+  , ('ο', "*o")
+  , ('π', "*p")
+  , ('ρ', "*r")
+  , ('ς', "ts")
+  , ('σ', "*s")
+  , ('τ', "*t")
+  , ('υ', "*u")
+  , ('ϕ', "*f")
+  , ('χ', "*x")
+  , ('ψ', "*q")
+  , ('ω', "*w")
+  , ('ϑ', "+h")
+  , ('φ', "+f")
+  , ('ϖ', "+p")
+  , ('ϵ', "+e")
+  , ('♣', "CL")
+  , ('♠', "SP")
+  , ('♥', "HE")
+  , ('♦', "DI")
+  ]
+
+-- use like: \\[E a^ aa]
+combiningAccents :: [(Char, String)]
+combiningAccents =
+  [ ('˝' , "\\[a\"]")
+  , ('¯', "\\[a-]")
+  , ('˙', "\\[a.]")
+  , ('^', "\\[a^]")
+  , ('´', "\\[aa]")
+  , ('`', "\\[ga]")
+  , ('˘', "\\[ab]")
+  , ('¸', "\\[ac]")
+  , ('¨', "\\[ad]")
+  , ('ˇ', "\\[ah]")
+  , ('˚', "\\[ao]")
+  , ('~', "\\[a~]")
+  , ('˛', "\\[ho]")
+  , ('^', "\\[ha]")
+  , ('~', "\\[ti]")
+  ]