ren/hugo-to-gemini
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Update heading renderer to latest Gemini spec

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Gemini spec p. 5.5.1 used to only allow up to three #-s in a heading
before requiring a mandatory space. It changed to an optional space in
recent updates, allowing to no longer pad Markdown H4-H6.

As clients treat everything after ### a title continuation, the renderer
will now insert H4-H6 verbatim; the end-user behavior doesn't change as
extra space means nothing for a Gemtext renderer displaying the title in
a special way.

Relates to #1.

PS: Gemini spec doesn't appear to be properly versioned, saying the
latest version is 0.14.3, 2020-11-29. The discussion on #1 clearly shows
it used to be different a while ago.
This commit is contained in:
Timur Demin 2021-09-17 23:02:17 +05:00
parent 45180f9315
commit 8135d1e0b3
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GPG key ID: 9EDF3F9D9286FA20
1 changed files with 2 additions and 11 deletions
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13
internal/renderer/renderer.go
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@ -140,25 +140,16 @@ func (r Renderer) superscript(w io.Writer, node *ast.Superscript, entering bool)
}
}
const gemtextHeadingLevelLimit = 3
func (r Renderer) heading(w io.Writer, node *ast.Heading, entering bool) {
if entering {
// pad headings with the relevant number of #-s; Gemini spec allows 3 at
// maximum before the space, therefore add one after 3 and keep padding
// pad headings with the relevant number of #-s; Gemini spec
// used to allow 3 at maximum before a space
bufLength := node.Level + 1
spaceNeeded := node.Level > gemtextHeadingLevelLimit
if spaceNeeded {
bufLength++
}
heading := make([]byte, bufLength)
heading[len(heading)-1] = ' '
for i := 0; i < len(heading)-1; i++ {
heading[i] = '#'
}
if spaceNeeded {
heading[gemtextHeadingLevelLimit] = ' '
}
w.Write(heading)
r.text(w, node)
} else {