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Require no space after/before emphasis delimiter

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Many markdown implementations require that `*` be not followed (resp.
preceded) by whitespace to open (resp. close) emphasis. For example,
commonmark.js, Markdown.pl, and pandoc compile the follow markdown

```markdown
a* asdf *a
```

to

```html
<p>a* asdf *a</p>
```

On the other hand, Python-Markdown allows whitespace:

```html
<p>a<em> asdf </em>a</p>
```

See https://johnmacfarlane.net/babelmark2/?normalize=1&text=a*+asdf+*a

Since variants of commonmark (including GFM) are prevalent these days,
it makes more sense to follow the first behavior.
This commit is contained in:
Jaehwang Jerry Jung
2022-01-11 02:31:57 +09:00
committed by Tim Pope
parent db82f00b58
commit ec486958ea
1 changed files with 3 additions and 3 deletions
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6
syntax/markdown.vim
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@@ -110,11 +110,11 @@ let s:concealends = ''
if has('conceal') && get(g:, 'markdown_syntax_conceal', 1) == 1
let s:concealends = ' concealends'
endif
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\S\@<=\*\|\*\S\@=" end="\S\@<=\*\|\*\S\@=" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\*\S\@=" end="\S\@<=\*" skip="\\\*" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownItalic matchgroup=markdownItalicDelimiter start="\w\@<!_\S\@=" end="\S\@<=_\w\@!" skip="\\_" contains=markdownLineStart,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\S\@<=\*\*\|\*\*\S\@=" end="\S\@<=\*\*\|\*\*\S\@=" skip="\\\*" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
exe 'syn region markdownBold matchgroup=markdownBoldDelimiter start="\*\*\S\@=" end="\S\@<=\*\*" skip="\\\*" contains=markdownLineStart,markdownItalic,@Spell' . s:concealends
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\@<=\*\*\*\|\*\*\*\S\@=" end="\S\@<=\*\*\*\|\*\*\*\S\@=" skip="\\\*" contains=markdownLineStart,@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
syn region markdownCode matchgroup=markdownCodeDelimiter start="`" end="`" keepend contains=markdownLineStart