From be53a9cb8553e532945c2fa1c1eb54538fcb6787 Mon Sep 17 00:00:00 2001
From: Gavinok <34443260+Gavinok@users.noreply.github.com>
Date: Thu, 2 Apr 2020 15:40:56 -0600
Subject: [PATCH] Syntax highlight "LaTeX math fragments" and provide conceal
 options (#1)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

"LaTeX math fragments" will now be syntax highlighted in Org mode files.
If `conceallevel=2` is set, the LaTeX symbols will be displayed as their
Unicode equivalents.  E.g.

    $\alpha$ --> α
    \( x^2 \)  --> x²

For more info, see: <https://orgmode.org/manual/LaTeX-fragments.html#LaTeX-fragments>
---
 syntax/org.vim | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/syntax/org.vim b/syntax/org.vim
index 9475d45..65dc78f 100644
--- a/syntax/org.vim
+++ b/syntax/org.vim
@@ -65,12 +65,12 @@ highlight def link orgComment Comment
 
 
 " Headings
-syntax match orgHeading1 /^\s*\*\{1}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
-syntax match orgHeading2 /^\s*\*\{2}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
-syntax match orgHeading3 /^\s*\*\{3}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
-syntax match orgHeading4 /^\s*\*\{4}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
-syntax match orgHeading5 /^\s*\*\{5}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
-syntax match orgHeading6 /^\s*\*\{6,}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo
+syntax match orgHeading1 /^\s*\*\{1}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
+syntax match orgHeading2 /^\s*\*\{2}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
+syntax match orgHeading3 /^\s*\*\{3}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
+syntax match orgHeading4 /^\s*\*\{4}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
+syntax match orgHeading5 /^\s*\*\{5}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
+syntax match orgHeading6 /^\s*\*\{6,}\s\+.*$/ keepend contains=@Spell,orgTag,orgTodo,orgMath
 
 syntax match orgTag /:\w\{-}:/ contained contains=orgTag
 exec 'syntax keyword orgTodo contained ' . join(org#option('org_state_keywords', ['TODO', 'NEXT', 'DONE']), ' ')
@@ -111,5 +111,23 @@ highlight def link orgHyperCentre Comment
 highlight def link orgHyperLeft Comment
 highlight def link orgHyperRight Comment
 
+" TeX
+" Support for both inline and block based embedded latex
+" eg: $Latex$ for inline or $$ LaTeX $$ for a block
+" Note:
+" - $LaTeX$ uses the tex.vim syntax for its conceal properties
+" - Inspired by https://github.com/vim-pandoc/vim-pandoc-syntax
+" - the conceal settings follows your g:tex_conceal setting for
+"   more info run :h tex-conceal.
+" Ref: https://orgmode.org/manual/LaTeX-fragments.html#LaTeX-fragments
+syntax include @LATEX syntax/tex.vim
+syntax region orgMath     start="\\begin\[.*\]{.*}"  end="\\end{.*}"         keepend contains=@LATEX
+syntax region orgMath     start="\\begin{.*}"        end="\\end{.*}"         keepend contains=@LATEX
+syntax region orgMath     start="\\\["               end="\\\]"              keepend contains=@LATEX
+syntax region orgMath     start="\\("                end="\\)"               keepend contains=@LATEX
+syntax region orgMath     start="\S\@<=\$\|\$\S\@="  end="\S\@<=\$\|\$\S\@=" keepend oneline contains=@LATEX
+syntax region orgMath     start=/\$\$/               end=/\$\$/              keepend contains=@LATEX
+syntax match  orgMath /\\\$/ conceal cchar=$
+hi def link orgMath     String
 
 let b:current_syntax = 'org'