kiln/render.go
2020-09-29 10:57:15 -04:00

73 lines
1.8 KiB
Go

package main
import (
"bytes"
"fmt"
"html"
"io"
"git.sr.ht/~adnano/gmi"
)
// GeminiToHTML reads Gemini from the provided reader and returns an HTML string.
func GeminiToHTML(r io.Reader) []byte {
var b bytes.Buffer
var pre bool
var list bool
b.WriteString("<link rel='stylesheet' href='/style.css'>\n")
text := gmi.Parse(r)
for _, l := range text {
if _, ok := l.(gmi.LineListItem); ok {
if !list {
list = true
b.WriteString("<ul>\n")
}
} else if list {
list = false
b.WriteString("</ul>\n")
}
switch l.(type) {
case gmi.LineLink:
link := l.(gmi.LineLink)
url := html.EscapeString(link.URL)
name := html.EscapeString(link.Name)
if name == "" {
name = url
}
fmt.Fprintf(&b, "<p><a href='%s'>%s</a></p>", url, name)
case gmi.LinePreformattingToggle:
pre = !pre
if pre {
b.WriteString("<pre>\n")
} else {
b.WriteString("</pre>\n")
}
case gmi.LinePreformattedText:
text := string(l.(gmi.LinePreformattedText))
fmt.Fprintf(&b, "%s\n", html.EscapeString(text))
case gmi.LineHeading1:
text := string(l.(gmi.LineHeading1))
fmt.Fprintf(&b, "<h1>%s</h1>\n", html.EscapeString(text))
case gmi.LineHeading2:
text := string(l.(gmi.LineHeading2))
fmt.Fprintf(&b, "<h2>%s</h2>\n", html.EscapeString(text))
case gmi.LineHeading3:
text := string(l.(gmi.LineHeading3))
fmt.Fprintf(&b, "<h3>%s</h3>\n", html.EscapeString(text))
case gmi.LineListItem:
text := string(l.(gmi.LineListItem))
fmt.Fprintf(&b, "<li>%s</li>\n", html.EscapeString(text))
case gmi.LineQuote:
text := string(l.(gmi.LineQuote))
fmt.Fprintf(&b, "<blockquote>%s</blockquote>\n", html.EscapeString(text))
case gmi.LineText:
text := string(l.(gmi.LineText))
fmt.Fprintf(&b, "<p>%s</p>\n", html.EscapeString(text))
}
}
return b.Bytes()
}