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Handle H4-H6 in accordance with Gemini spec

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Unlike Markdown, which has 6 levels of headings, Gemini spec (p. 5.5.1)
only allows up to 3 shebang characters before a space. This adds an extra
space before levels 4-6 in order to comply with the spec.

Fixes #1.
This commit is contained in:
Timur Demin 2021-08-09 12:00:48 +05:00
parent 2ea0b7d5fa
commit 0be85fc7f9
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GPG key ID: 9EDF3F9D9286FA20
1 changed files with 13 additions and 2 deletions
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15
internal/gemini/renderer.go
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@ -91,14 +91,25 @@ func (r Renderer) blockquote(w io.Writer, node *ast.BlockQuote, 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
heading := make([]byte, node.Level+1)
// 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
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)
for _, text := range node.Children {
w.Write(text.AsLeaf().Literal)