From 4f0120ec663e5b4a386563930ffbbea1f22d9029 Mon Sep 17 00:00:00 2001
From: Sebastian Klatt <sebastian@markow.io>
Date: Thu, 19 Nov 2015 02:04:30 +0100
Subject: [PATCH] Use tex syntax for inline math

* Fix yaml interference
* Add unittest
---
 syntax/markdown.vim | 11 ++++++-----
 test/syntax.vader   | 12 ++++++++++++
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index ebe10f7..9041ab1 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -96,17 +96,18 @@ syn region htmlH6       start="^\s*######"              end="$" contains=@Spell
 syn match  htmlH1       /^.\+\n=\+$/ contains=@Spell
 syn match  htmlH2       /^.\+\n-\+$/ contains=@Spell
 
-if get(g:, 'vim_markdown_math', 0)
-  syn region mkdMath matchgroup=mkdDelimiter start="\\\@<!\$" end="\$"
-  syn region mkdMath matchgroup=mkdDelimiter start="\\\@<!\$\$" end="\$\$"
-endif
-
 " YAML frontmatter
 if get(g:, 'vim_markdown_frontmatter', 0)
   syn include @yamlTop syntax/yaml.vim
   syn region Comment matchgroup=mkdDelimiter start="\%^---$" end="^---$" contains=@yamlTop
 endif
 
+if get(g:, 'vim_markdown_math', 0)
+  syn include @tex syntax/tex.vim
+  syn region mkdMath matchgroup=mkdDelimiter start="\\\@<!\$" end="\$" contains=@tex
+  syn region mkdMath matchgroup=mkdDelimiter start="\\\@<!\$\$" end="\$\$" contains=@tex
+endif
+
 syn cluster mkdNonListItem contains=htmlItalic,htmlBold,htmlBoldItalic,mkdFootnotes,mkdInlineURL,mkdLink,mkdLinkDef,mkdLineBreak,mkdBlockquote,mkdCode,mkdIndentCode,mkdListItem,mkdRule,htmlH1,htmlH2,htmlH3,htmlH4,htmlH5,htmlH6,mkdMath
 
 "highlighting for Markdown groups
diff --git a/test/syntax.vader b/test/syntax.vader
index 4ce40ff..6ad8907 100644
--- a/test/syntax.vader
+++ b/test/syntax.vader
@@ -197,6 +197,18 @@ Execute (multiline math):
   AssertEqual SyntaxOf('b'), 'mkdMath'
   AssertNotEqual SyntaxOf('c'), 'mkdMath'
 
+Given markdown;
+$ \sqrt{a}{b} $
+$$ \sqrt{a}{b} $$
+
+Execute (math tex highlighting):
+  let g:vim_markdown_math=0
+  syn off | syn on
+  AssertNotEqual SyntaxOf('a'), 'texMatcher'
+  let g:vim_markdown_math=1
+  syn off | syn on
+  AssertEqual SyntaxOf('a'), 'texMatcher'
+
 # YAML frontmatter
 
 Given markdown;
-- 
2.39.2