From a4431a8373c2e1207ba4fdf4bad58d0feba0e7a6 Mon Sep 17 00:00:00 2001
From: Alexandre Constantino <dreaming.about.electric.sheep@gmail.com>
Date: Thu, 4 Feb 2016 09:02:15 +0000
Subject: [PATCH] Add option for single-line only text emphasis

---
 README.md           |  7 +++++++
 syntax/markdown.vim | 41 ++++++++++++++++-------------------------
 2 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/README.md b/README.md
index 6780572..73b7931 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,13 @@ It never increases its default size (half screen), it only shrinks.
 let g:vim_markdown_toc_autofit = 1
 ```
 
+### Text emphasis restriction to single-lines
+
+By default text emphasis works across multiple lines until a closing token is found. However, it's possible to restrict text emphasis to a single line (ie, for it to be applied a closing token must be found on the same line). To do so:
+```vim
+let g:vim_markdown_emphasis_multiline = 0
+```
+
 ### Syntax Concealing
 
 Concealing is set for some syntax.
diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 8c3d75c..a897f60 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -42,31 +42,22 @@ if has('conceal')
 endif
 
 "additions to HTML groups
-"syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]" end="[^\\\*\t ]\zs\*\ze\_W" keepend
-"syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs_\ze\_W" keepend
-"syn region htmlBold start="\*\*\ze\S" end="\S\zs\*\*" keepend
-"syn region htmlBold start="__\ze\S" end="\S\zs__" keepend
-"syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend
-"syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend
-
-" emphasis stops at newline (in case a closing token is not found before)
-"if get(g:, "vim_markdown_emphasis_stops_at_newline", 1)
-"    let esanl_pre = '\(\n\|'
-"    let esanl_suf = '\)'
-"else
-"    let esanl_pre = ''
-"    let esanl_suf = ''
-"endif
-"execute 'syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]" end="[^\\\*\t ]\zs' . esanl_pre . '\*' . esanl_suf . '\ze\_W" keepend'
-"execute 'syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs' . esanl_pre . '_' . esanl_suf . '\ze\_W" keepend'
-"execute 'syn region htmlBold start="\*\*\ze\S" end="\S\zs' . esanl_pre . '\*\*' . esanl_suf . '" keepend'
-"execute 'syn region htmlBold start="__\ze\S" end="\S\zs__" keepend
-"execute 'syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend
-"execute 'syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend
-
-" single-line emphasis (emphasis only works with matching token in the same line)
-syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]\([^\n]*[^\\\*\t ]\)\?\*" end="[^\\\*\t ]\zs\*\ze\_W" keepend
-
+if get(g:, "vim_markdown_emphasis_multiline", 1)
+    syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]" end="[^\\\*\t ]\zs\*\ze\_W" keepend
+    syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]" end="[^\\_\t ]\zs_\ze\_W" keepend
+    syn region htmlBold start="\*\*\ze\S" end="\S\zs\*\*" keepend
+    syn region htmlBold start="__\ze\S" end="\S\zs__" keepend
+    syn region htmlBoldItalic start="\*\*\*\ze\S" end="\S\zs\*\*\*" keepend
+    syn region htmlBoldItalic start="___\ze\S" end="\S\zs___" keepend
+else
+    " single-line emphasis (emphasis only works with closing token on the same line)
+    syn region htmlItalic start="\%(^\|\s\)\zs\*\ze[^\\\*\t ]\([^\n\*]*[^\\\*\t ]\)\?\*" end="[^\\\*\t ]\zs\*\ze\_W" keepend
+    syn region htmlItalic start="\%(^\|\s\)\zs_\ze[^\\_\t ]\([^\n_]*[^\\_\t ]\)\?_" end="[^\\_\t ]\zs_\ze\_W" keepend
+    syn region htmlBold start="\*\*\ze\S\([^\n\*]*[^\\\*\t ]\)\?\*\*" end="\S\zs\*\*" keepend
+    syn region htmlBold start="__\ze\S\([^\n_]*[^\\_\t ]\)\?__" end="\S\zs__" keepend
+    syn region htmlBold start="\*\*\*\ze\S\([^\n\*]*[^\\\*\t ]\)\?\*\*\*" end="\S\zs\*\*\*" keepend
+    syn region htmlBold start="___\ze\S\([^\n_]*[^\\_\t ]\)\?___" end="\S\zs___" keepend
+endif
 
 " [link](URL) | [link][id] | [link][] | ![image](URL)
 syn region mkdFootnotes matchgroup=mkdDelimiter start="\[^"    end="\]"
-- 
2.39.5