ren/hugo-to-gemini
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Add support for HR and super/sub-script

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This makes the renderer write --- in place of
Markdown/HTML horizontal lines, and render super/subscript
as ^(superscript) and _{subscript} respectively.
This commit is contained in:
mntn 2021-08-29 10:28:43 -04:00 committed by GitHub
parent ba767bc91f
commit 86faf01552
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1 changed files with 43 additions and 0 deletions
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43
internal/gemini/renderer.go
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@ -42,6 +42,11 @@ var (
emphDelimiter = []byte("*")
strongDelimiter = []byte("**")
delDelimiter = []byte("~~")
horizontalRule = []byte("---")
subOpen = []byte("_{")
subClose = []byte("}")
supOpen = []byte("^(")
supClose = []byte(")")
)
var meaningfulCharsRegex = regexp.MustCompile(`\A[\s]+\z`)
@ -121,6 +126,34 @@ func (r Renderer) blockquote(w io.Writer, node *ast.BlockQuote, entering bool) {
}
}
func (r Renderer) hr(w io.Writer, node *ast.HorizontalRule, entering bool) {
if entering {
w.Write(horizontalRule)
w.Write(lineBreak)
w.Write(lineBreak)
}
}
// Based on https://pages.uoregon.edu/ncp/Courses/MathInPlainTextEmail.html
func (r Renderer) subscript(w io.Writer, node *ast.Subscript, entering bool) {
if entering {
if node := node.AsLeaf(); node != nil {
w.Write(subOpen)
w.Write([]byte(strings.ReplaceAll(string(node.Literal), "\n", " ")))
w.Write(subClose)
}
}
}
func (r Renderer) superscript(w io.Writer, node *ast.Superscript, entering bool) {
if entering {
if node := node.AsLeaf(); node != nil {
w.Write(supOpen)
w.Write([]byte(strings.ReplaceAll(string(node.Literal), "\n", " ")))
w.Write(supClose)
}
}
}
const gemtextHeadingLevelLimit = 3
func (r Renderer) heading(w io.Writer, node *ast.Heading, entering bool) {
@ -195,6 +228,14 @@ func (r Renderer) paragraph(w io.Writer, node *ast.Paragraph, entering bool) (no
if !linksOnly {
r.text(w, child)
}
case *ast.Subscript:
if !linksOnly {
r.subscript(w, child, true)
}
case *ast.Superscript:
if !linksOnly {
r.superscript(w, child, true)
}
}
}
if !linksOnly {
@ -392,6 +433,8 @@ func (r Renderer) RenderNode(w io.Writer, node ast.Node, entering bool) ast.Walk
switch node := node.(type) {
case *ast.BlockQuote:
r.blockquote(w, node, entering)
case *ast.HorizontalRule:
r.hr(w, node, entering)
case *ast.Heading:
r.heading(w, node, entering)
noNewLine = false