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Improve display of footnote backlinks

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This makes three changes to backlinks:

- Inserts a space before `<a href='…'>↩</a>` to make it look better
- Uses hexadecimal references (`&#x…;`) instead of decimal references for clarity
- Adds U+FE0E VARIATION SELECTOR 15 to the ↩ to suppress emojification on both iOS and Edge on Windows

If variation selector 15 isn't appended to the ↩, then the return arrow will show up as an emoji on iOS and Edge for Windows. The Pandoc project has already run into this quirk as documented on https://github.com/jgm/pandoc/issues/5469 and they've pushed a change for their Markdown processor already.
This commit is contained in:
Nathan Galt 2019-12-03 19:34:16 -08:00
parent 511e434efc
commit 6f9629fb2b
2 changed files with 4 additions and 4 deletions
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4
extension/_test/footnote.txt
View file

@ -12,7 +12,7 @@ That's some text with a footnote.[^1]
<ol>
<li id="fn:1" role="doc-endnote">
<p>And that's the footnote.</p>
<p>That's the second paragraph.<a href="#fnref:1" class="footnote-backref" role="doc-backlink">&#8617;</a></p>
<p>That's the second paragraph. <a href="#fnref:1" class="footnote-backref" role="doc-backlink">&#x21a9;&#xfe0e;</a></p>
</li>
</ol>
</section>
@ -26,7 +26,7 @@ That's some text with a footnote.[^1]
<hr>
<ol>
<li id="fn:1" role="doc-endnote">
<p>0 [^]:<a href="#fnref:1" class="footnote-backref" role="doc-backlink">&#8617;</a></p>
<p>0 [^]: <a href="#fnref:1" class="footnote-backref" role="doc-backlink">&#x21a9;&#xfe0e;</a></p>
</li>
</ol>
</section>

4
extension/footnote.go
View file

@ -237,10 +237,10 @@ func (r *FootnoteHTMLRenderer) renderFootnoteBackLink(w util.BufWriter, source [
if entering {
n := node.(*ast.FootnoteBackLink)
is := strconv.Itoa(n.Index)
_, _ = w.WriteString(`<a href="#fnref:`)
_, _ = w.WriteString(` <a href="#fnref:`)
_, _ = w.WriteString(is)
_, _ = w.WriteString(`" class="footnote-backref" role="doc-backlink">`)
_, _ = w.WriteString("&#8617;")
_, _ = w.WriteString("&#x21a9;&#xfe0e;")
_, _ = w.WriteString(`</a>`)
}
return gast.WalkContinue, nil