From 70e308f2f9673cdf13bb42be4ad9b68265c02df1 Mon Sep 17 00:00:00 2001
From: John MacFarlane <fiddlosopher@gmail.com>
Date: Sat, 12 Jan 2013 10:21:19 -0800
Subject: Escape `|` as `\vert` in LaTeX math.
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This avoids a clash with highlighting-kate's macros, which
redefine | as a short verbatim delimiter.  Thanks to
Björn Peemöller for raising this issue.
---
 src/Text/Pandoc/Writers/LaTeX.hs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'src/Text/Pandoc')

diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index aede568b6..035a98170 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -214,6 +214,13 @@ stringToLaTeX  isUrl (x:xs) = do
        '\x2013' | ligatures -> "--" ++ rest
        _        -> x : rest
 
+-- This is needed because | in math mode interacts badly with
+-- highlighting-kate, which redefines | as a short verb command.
+escapeMath :: String -> String
+escapeMath ('|':xs) = "\\vert " ++ escapeMath xs
+escapeMath (x:xs)   = x : escapeMath xs
+escapeMath []       = ""
+
 -- | Puts contents into LaTeX command.
 inCmd :: String -> Doc -> Doc
 inCmd cmd contents = char '\\' <> text cmd <> braces contents
@@ -603,8 +610,10 @@ inlineToLaTeX (Quoted qt lst) = do
                       then char '`' <> inner <> char '\''
                       else char '\x2018' <> inner <> char '\x2019'
 inlineToLaTeX (Str str) = liftM text $ stringToLaTeX False str
-inlineToLaTeX (Math InlineMath str) = return $ char '$' <> text str <> char '$'
-inlineToLaTeX (Math DisplayMath str) = return $ "\\[" <> text str <> "\\]"
+inlineToLaTeX (Math InlineMath str) =
+  return $ char '$' <> text (escapeMath str) <> char '$'
+inlineToLaTeX (Math DisplayMath str) =
+  return $ "\\[" <> text (escapeMath str) <> "\\]"
 inlineToLaTeX (RawInline "latex" str) = return $ text str
 inlineToLaTeX (RawInline "tex" str) = return $ text str
 inlineToLaTeX (RawInline _ _) = return empty
-- 
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