1package main
 2
 3import (
 4	"fmt"
 5	"html"
 6	"strings"
 7
 8	"git.sr.ht/~adnano/go-gemini"
 9)
10
11func textToHTML(text gemini.Text) string {
12	var b strings.Builder
13	var pre bool
14	var list bool
15	for _, l := range text {
16		if _, ok := l.(gemini.LineListItem); ok {
17			if !list {
18				list = true
19				fmt.Fprint(&b, "<ul>\n")
20			}
21		} else if list {
22			list = false
23			fmt.Fprint(&b, "</ul>\n")
24		}
25		switch l.(type) {
26		case gemini.LineLink:
27			link := l.(gemini.LineLink)
28			url := html.EscapeString(link.URL)
29			name := html.EscapeString(link.Name)
30			if name == "" {
31				name = url
32			}
33			fmt.Fprintf(&b, "<p><a href='%s'>%s</a></p>\n", url, name)
34		case gemini.LinePreformattingToggle:
35			pre = !pre
36			if pre {
37				altText := string(l.(gemini.LinePreformattingToggle))
38				if altText != "" {
39					altText = html.EscapeString(altText)
40					fmt.Fprintf(&b, "<pre title='%s'>\n", altText)
41				}
42				fmt.Fprint(&b, "<pre>\n")
43			} else {
44				fmt.Fprint(&b, "</pre>\n")
45			}
46		case gemini.LinePreformattedText:
47			text := string(l.(gemini.LinePreformattedText))
48			fmt.Fprintf(&b, "%s\n", html.EscapeString(text))
49		case gemini.LineHeading1:
50			text := string(l.(gemini.LineHeading1))
51			fmt.Fprintf(&b, "<h1>%s</h1>\n", html.EscapeString(text))
52		case gemini.LineHeading2:
53			text := string(l.(gemini.LineHeading2))
54			fmt.Fprintf(&b, "<h2>%s</h2>\n", html.EscapeString(text))
55		case gemini.LineHeading3:
56			text := string(l.(gemini.LineHeading3))
57			fmt.Fprintf(&b, "<h3>%s</h3>\n", html.EscapeString(text))
58		case gemini.LineListItem:
59			text := string(l.(gemini.LineListItem))
60			fmt.Fprintf(&b, "<li>%s</li>\n", html.EscapeString(text))
61		case gemini.LineQuote:
62			text := string(l.(gemini.LineQuote))
63			fmt.Fprintf(&b, "<blockquote>%s</blockquote>\n", html.EscapeString(text))
64		case gemini.LineText:
65			text := string(l.(gemini.LineText))
66			if text == "" {
67				fmt.Fprint(&b, "<br>\n")
68			} else {
69				fmt.Fprintf(&b, "<p>%s</p>\n", html.EscapeString(text))
70			}
71		}
72	}
73	if pre {
74		fmt.Fprint(&b, "</pre>\n")
75	}
76	if list {
77		fmt.Fprint(&b, "</ul>\n")
78	}
79	return b.String()
80}