Add (Text).HTML function to render text to HTML

text.go

@@ -3,6 +3,7 @@ package gmi
 import (
 	"bufio"
 	"fmt"
+	"html"
 	"io"
 	"strings"
 )
@@ -150,3 +151,70 @@ func (t Text) String() string {
 	}
 	return b.String()
 }
+
+// HTML returns the Gemini text response as HTML.
+func (t Text) HTML() string {
+	var b strings.Builder
+	var pre bool
+	var list bool
+	for _, l := range t {
+		if _, ok := l.(LineListItem); ok {
+			if !list {
+				list = true
+				fmt.Fprint(&b, "<ul>\n")
+			}
+		} else if list {
+			list = false
+			fmt.Fprint(&b, "</ul>\n")
+		}
+		switch l.(type) {
+		case LineLink:
+			link := l.(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>\n", url, name)
+		case LinePreformattingToggle:
+			pre = !pre
+			if pre {
+				fmt.Fprint(&b, "<pre>\n")
+			} else {
+				fmt.Fprint(&b, "</pre>\n")
+			}
+		case LinePreformattedText:
+			text := string(l.(LinePreformattedText))
+			fmt.Fprintf(&b, "%s\n", html.EscapeString(text))
+		case LineHeading1:
+			text := string(l.(LineHeading1))
+			fmt.Fprintf(&b, "<h1>%s</h1>\n", html.EscapeString(text))
+		case LineHeading2:
+			text := string(l.(LineHeading2))
+			fmt.Fprintf(&b, "<h2>%s</h2>\n", html.EscapeString(text))
+		case LineHeading3:
+			text := string(l.(LineHeading3))
+			fmt.Fprintf(&b, "<h3>%s</h3>\n", html.EscapeString(text))
+		case LineListItem:
+			text := string(l.(LineListItem))
+			fmt.Fprintf(&b, "<li>%s</li>\n", html.EscapeString(text))
+		case LineQuote:
+			text := string(l.(LineQuote))
+			fmt.Fprintf(&b, "<blockquote>%s</blockquote>\n", html.EscapeString(text))
+		case LineText:
+			text := string(l.(LineText))
+			if text == "" {
+				fmt.Fprint(&b, "<br>\n")
+			} else {
+				fmt.Fprintf(&b, "<p>%s</p>\n", html.EscapeString(text))
+			}
+		}
+	}
+	if pre {
+		fmt.Fprint(&b, "</pre>\n")
+	}
+	if list {
+		fmt.Fprint(&b, "</ul>\n")
+	}
+	return b.String()
+}