From 88db6024b93ca7bbc2137f5539768ed697e2f711 Mon Sep 17 00:00:00 2001
From: Rodrigo Haenggi <rodrigo@codegestalt.com>
Date: Thu, 14 Feb 2013 21:21:29 +0100
Subject: [PATCH 1/5] strikethrough support as requested in #26

---
 syntax/markdown.vim | 88 +++++++++++++++++++++++----------------------
 1 file changed, 46 insertions(+), 42 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index e0a09dc..e9cdb5a 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -116,6 +116,7 @@ exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@="
 exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\w\@<!__\S\@=" end="\S\@<=__\w\@!\|^$" skip="\\_" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\*\*\*\S\@=" end="\S\@<=\*\*\*\|^$" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\w\@<!___\S\@=" end="\S\@<=___\w\@!\|^$" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
+exe 'syn region markdownStrikethrough matchgroup=markdownStrikethroughDelimiter start="\S\@<=\~\~\|\~\~\S\@=" end="\S\@<=\~\~\|\~\~\S\@=" contains=markdownLineStart,@Spell' . s:concealends
 
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`" end="`" keepend contains=markdownLineStart
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`` \=" end=" \=``" keepend contains=markdownLineStart
@@ -142,48 +143,51 @@ endif
 syn match markdownEscape "\\[][\\`*_{}()<>#+.!-]"
 syn match markdownError "\w\@<=_\w\@="
 
-hi def link markdownH1                    htmlH1
-hi def link markdownH2                    htmlH2
-hi def link markdownH3                    htmlH3
-hi def link markdownH4                    htmlH4
-hi def link markdownH5                    htmlH5
-hi def link markdownH6                    htmlH6
-hi def link markdownHeadingRule           markdownRule
-hi def link markdownH1Delimiter           markdownHeadingDelimiter
-hi def link markdownH2Delimiter           markdownHeadingDelimiter
-hi def link markdownH3Delimiter           markdownHeadingDelimiter
-hi def link markdownH4Delimiter           markdownHeadingDelimiter
-hi def link markdownH5Delimiter           markdownHeadingDelimiter
-hi def link markdownH6Delimiter           markdownHeadingDelimiter
-hi def link markdownHeadingDelimiter      Delimiter
-hi def link markdownOrderedListMarker     markdownListMarker
-hi def link markdownListMarker            htmlTagName
-hi def link markdownBlockquote            Comment
-hi def link markdownRule                  PreProc
-
-hi def link markdownFootnote              Typedef
-hi def link markdownFootnoteDefinition    Typedef
-
-hi def link markdownLinkText              htmlLink
-hi def link markdownIdDeclaration         Typedef
-hi def link markdownId                    Type
-hi def link markdownAutomaticLink         markdownUrl
-hi def link markdownUrl                   Float
-hi def link markdownUrlTitle              String
-hi def link markdownIdDelimiter           markdownLinkDelimiter
-hi def link markdownUrlDelimiter          htmlTag
-hi def link markdownUrlTitleDelimiter     Delimiter
-
-hi def link markdownItalic                htmlItalic
-hi def link markdownItalicDelimiter       markdownItalic
-hi def link markdownBold                  htmlBold
-hi def link markdownBoldDelimiter         markdownBold
-hi def link markdownBoldItalic            htmlBoldItalic
-hi def link markdownBoldItalicDelimiter   markdownBoldItalic
-hi def link markdownCodeDelimiter         Delimiter
-
-hi def link markdownEscape                Special
-hi def link markdownError                 Error
+hi def link markdownH1                     htmlH1
+hi def link markdownH2                     htmlH2
+hi def link markdownH3                     htmlH3
+hi def link markdownH4                     htmlH4
+hi def link markdownH5                     htmlH5
+hi def link markdownH6                     htmlH6
+hi def link markdownHeadingRule            markdownRule
+hi def link markdownH1Delimiter            markdownHeadingDelimiter
+hi def link markdownH2Delimiter            markdownHeadingDelimiter
+hi def link markdownH3Delimiter            markdownHeadingDelimiter
+hi def link markdownH4Delimiter            markdownHeadingDelimiter
+hi def link markdownH5Delimiter            markdownHeadingDelimiter
+hi def link markdownH6Delimiter            markdownHeadingDelimiter
+hi def link markdownHeadingDelimiter       Delimiter
+hi def link markdownOrderedListMarker      markdownListMarker
+hi def link markdownListMarker             htmlTagName
+hi def link markdownBlockquote             Comment
+hi def link markdownRule                   PreProc
+
+hi def link markdownFootnote               Typedef
+hi def link markdownFootnoteDefinition     Typedef
+
+hi def link markdownLinkText               htmlLink
+hi def link markdownIdDeclaration          Typedef
+hi def link markdownId                     Type
+hi def link markdownAutomaticLink          markdownUrl
+hi def link markdownUrl                    Float
+hi def link markdownUrlTitle               String
+hi def link markdownIdDelimiter            markdownLinkDelimiter
+hi def link markdownUrlDelimiter           htmlTag
+hi def link markdownUrlTitleDelimiter      Delimiter
+
+hi def link markdownItalic                 htmlItalic
+hi def link markdownItalicDelimiter        markdownItalic
+hi def link markdownBold                   htmlBold
+hi def link markdownBoldDelimiter          markdownBold
+hi def link markdownBoldItalic             htmlBoldItalic
+hi def link markdownBoldItalicDelimiter    markdownBoldItalic
+hi def link markdownStrikethrough          Comment
+hi def link markdownStrikethroughDelimiter Comment
+
+hi def link markdownCodeDelimiter          Delimiter
+
+hi def link markdownEscape                 Special
+hi def link markdownError                  Error
 
 let b:current_syntax = "markdown"
 if main_syntax ==# 'markdown'

From e361a6fab8e4ebe6f55d58d484dcaa5f7362f36e Mon Sep 17 00:00:00 2001
From: Joseph Adams <whitegolem@gmail.com>
Date: Fri, 21 Jan 2022 13:18:45 +0100
Subject: [PATCH 2/5] Use htmlStrike highlight group instead of Comment

---
 syntax/markdown.vim | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index e9cdb5a..57ac6fc 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -181,8 +181,8 @@ hi def link markdownBold                   htmlBold
 hi def link markdownBoldDelimiter          markdownBold
 hi def link markdownBoldItalic             htmlBoldItalic
 hi def link markdownBoldItalicDelimiter    markdownBoldItalic
-hi def link markdownStrikethrough          Comment
-hi def link markdownStrikethroughDelimiter Comment
+hi def link markdownStrikethrough          htmlStrike
+hi def link markdownStrikethroughDelimiter htmlStrike
 
 hi def link markdownCodeDelimiter          Delimiter
 

From 877478f337f1b45cf869d22472f4a80822ac4199 Mon Sep 17 00:00:00 2001
From: Joseph Adams <whitegolem@gmail.com>
Date: Fri, 21 Jan 2022 16:59:33 +0100
Subject: [PATCH 3/5] Make strikethrough synatax group more robust

As pointed out by @tomtomjhj it would be good to follow the lead of the
other emphasis syntax groups: allow no whitespace after/before the
emphasis delimiter and also don't let emphasis span multiple lines.
---
 syntax/markdown.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 57ac6fc..1783dc1 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -116,7 +116,7 @@ exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@="
 exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\w\@<!__\S\@=" end="\S\@<=__\w\@!\|^$" skip="\\_" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\*\*\*\S\@=" end="\S\@<=\*\*\*\|^$" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\w\@<!___\S\@=" end="\S\@<=___\w\@!\|^$" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
-exe 'syn region markdownStrikethrough matchgroup=markdownStrikethroughDelimiter start="\S\@<=\~\~\|\~\~\S\@=" end="\S\@<=\~\~\|\~\~\S\@=" contains=markdownLineStart,@Spell' . s:concealends
+exe 'syn region markdownStrikethrough matchgroup=markdownStrikethroughDelimiter start="\~\~\S\@=" end="\S\@<=\~\~\|^$" contains=markdownLineStart,@Spell' . s:concealends
 
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`" end="`" keepend contains=markdownLineStart
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`` \=" end=" \=``" keepend contains=markdownLineStart

From d669982ecce10ec2d8ef2f4b97b13690ba7be38c Mon Sep 17 00:00:00 2001
From: Joseph Adams <whitegolem@gmail.com>
Date: Sat, 22 Jan 2022 09:36:30 +0100
Subject: [PATCH 4/5] Rename highlight group to avoid realign from prev commit.

---
 syntax/markdown.vim | 92 ++++++++++++++++++++++-----------------------
 1 file changed, 46 insertions(+), 46 deletions(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 1783dc1..91ab95b 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -116,7 +116,7 @@ exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@="
 exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\w\@<!__\S\@=" end="\S\@<=__\w\@!\|^$" skip="\\_" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\*\*\*\S\@=" end="\S\@<=\*\*\*\|^$" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
 exe 'syn region markdownBoldItalic matchgroup=markdownBoldItalicDelimiter start="\w\@<!___\S\@=" end="\S\@<=___\w\@!\|^$" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
-exe 'syn region markdownStrikethrough matchgroup=markdownStrikethroughDelimiter start="\~\~\S\@=" end="\S\@<=\~\~\|^$" contains=markdownLineStart,@Spell' . s:concealends
+exe 'syn region markdownStrike matchgroup=markdownStrikeDelimiter start="\~\~\S\@=" end="\S\@<=\~\~\|^$" contains=markdownLineStart,@Spell' . s:concealends
 
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`" end="`" keepend contains=markdownLineStart
 syn region markdownCode matchgroup=markdownCodeDelimiter start="`` \=" end=" \=``" keepend contains=markdownLineStart
@@ -143,51 +143,51 @@ endif
 syn match markdownEscape "\\[][\\`*_{}()<>#+.!-]"
 syn match markdownError "\w\@<=_\w\@="
 
-hi def link markdownH1                     htmlH1
-hi def link markdownH2                     htmlH2
-hi def link markdownH3                     htmlH3
-hi def link markdownH4                     htmlH4
-hi def link markdownH5                     htmlH5
-hi def link markdownH6                     htmlH6
-hi def link markdownHeadingRule            markdownRule
-hi def link markdownH1Delimiter            markdownHeadingDelimiter
-hi def link markdownH2Delimiter            markdownHeadingDelimiter
-hi def link markdownH3Delimiter            markdownHeadingDelimiter
-hi def link markdownH4Delimiter            markdownHeadingDelimiter
-hi def link markdownH5Delimiter            markdownHeadingDelimiter
-hi def link markdownH6Delimiter            markdownHeadingDelimiter
-hi def link markdownHeadingDelimiter       Delimiter
-hi def link markdownOrderedListMarker      markdownListMarker
-hi def link markdownListMarker             htmlTagName
-hi def link markdownBlockquote             Comment
-hi def link markdownRule                   PreProc
-
-hi def link markdownFootnote               Typedef
-hi def link markdownFootnoteDefinition     Typedef
-
-hi def link markdownLinkText               htmlLink
-hi def link markdownIdDeclaration          Typedef
-hi def link markdownId                     Type
-hi def link markdownAutomaticLink          markdownUrl
-hi def link markdownUrl                    Float
-hi def link markdownUrlTitle               String
-hi def link markdownIdDelimiter            markdownLinkDelimiter
-hi def link markdownUrlDelimiter           htmlTag
-hi def link markdownUrlTitleDelimiter      Delimiter
-
-hi def link markdownItalic                 htmlItalic
-hi def link markdownItalicDelimiter        markdownItalic
-hi def link markdownBold                   htmlBold
-hi def link markdownBoldDelimiter          markdownBold
-hi def link markdownBoldItalic             htmlBoldItalic
-hi def link markdownBoldItalicDelimiter    markdownBoldItalic
-hi def link markdownStrikethrough          htmlStrike
-hi def link markdownStrikethroughDelimiter htmlStrike
-
-hi def link markdownCodeDelimiter          Delimiter
-
-hi def link markdownEscape                 Special
-hi def link markdownError                  Error
+hi def link markdownH1                    htmlH1
+hi def link markdownH2                    htmlH2
+hi def link markdownH3                    htmlH3
+hi def link markdownH4                    htmlH4
+hi def link markdownH5                    htmlH5
+hi def link markdownH6                    htmlH6
+hi def link markdownHeadingRule           markdownRule
+hi def link markdownH1Delimiter           markdownHeadingDelimiter
+hi def link markdownH2Delimiter           markdownHeadingDelimiter
+hi def link markdownH3Delimiter           markdownHeadingDelimiter
+hi def link markdownH4Delimiter           markdownHeadingDelimiter
+hi def link markdownH5Delimiter           markdownHeadingDelimiter
+hi def link markdownH6Delimiter           markdownHeadingDelimiter
+hi def link markdownHeadingDelimiter      Delimiter
+hi def link markdownOrderedListMarker     markdownListMarker
+hi def link markdownListMarker            htmlTagName
+hi def link markdownBlockquote            Comment
+hi def link markdownRule                  PreProc
+
+hi def link markdownFootnote              Typedef
+hi def link markdownFootnoteDefinition    Typedef
+
+hi def link markdownLinkText              htmlLink
+hi def link markdownIdDeclaration         Typedef
+hi def link markdownId                    Type
+hi def link markdownAutomaticLink         markdownUrl
+hi def link markdownUrl                   Float
+hi def link markdownUrlTitle              String
+hi def link markdownIdDelimiter           markdownLinkDelimiter
+hi def link markdownUrlDelimiter          htmlTag
+hi def link markdownUrlTitleDelimiter     Delimiter
+
+hi def link markdownItalic                htmlItalic
+hi def link markdownItalicDelimiter       markdownItalic
+hi def link markdownBold                  htmlBold
+hi def link markdownBoldDelimiter         markdownBold
+hi def link markdownBoldItalic            htmlBoldItalic
+hi def link markdownBoldItalicDelimiter   markdownBoldItalic
+hi def link markdownStrike                htmlStrike
+hi def link markdownStrikeDelimiter       htmlStrike
+
+hi def link markdownCodeDelimiter         Delimiter
+
+hi def link markdownEscape                Special
+hi def link markdownError                 Error
 
 let b:current_syntax = "markdown"
 if main_syntax ==# 'markdown'

From a9779083a86c282b56cf2cb496ab0ae4cefce4df Mon Sep 17 00:00:00 2001
From: Joseph Adams <whitegolem@gmail.com>
Date: Mon, 24 Jan 2022 11:53:55 +0100
Subject: [PATCH 5/5] Point `markdownStrikeDelimiter` to `markdownStrike`
 highlight group.

---
 syntax/markdown.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index 91ab95b..583767b 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -182,7 +182,7 @@ hi def link markdownBoldDelimiter         markdownBold
 hi def link markdownBoldItalic            htmlBoldItalic
 hi def link markdownBoldItalicDelimiter   markdownBoldItalic
 hi def link markdownStrike                htmlStrike
-hi def link markdownStrikeDelimiter       htmlStrike
+hi def link markdownStrikeDelimiter       markdownStrike
 
 hi def link markdownCodeDelimiter         Delimiter