package gmitohtml import ( "bufio" "bytes" "errors" "fmt" "net/url" "path" "strings" "sync" ) // ErrInvalidURL is the error returned when the URL is invalid. var ErrInvalidURL = errors.New("invalid URL") var daemonAddress string var assetLock sync.Mutex func rewriteURL(u string, loc *url.URL) string { if daemonAddress != "" { if strings.HasPrefix(u, "gemini://") { return "http://" + daemonAddress + "/gemini/" + u[9:] } else if strings.Contains(u, "://") { return u } else if loc != nil && len(u) > 0 && !strings.HasPrefix(u, "//") { newPath := u if u[0] != '/' { newPath = path.Join(loc.Path, u) } return "http://" + daemonAddress + "/gemini/" + loc.Host + newPath } return "http://" + daemonAddress + "/gemini/" + u } return u } // Convert converts text/gemini to text/html. func Convert(page []byte, u string) []byte { var result []byte var preformatted bool parsedURL, err := url.Parse(u) if err != nil { parsedURL = nil err = nil } scanner := bufio.NewScanner(bytes.NewReader(page)) for scanner.Scan() { line := scanner.Bytes() l := len(line) if l >= 3 && string(line[0:3]) == "```" { preformatted = !preformatted if preformatted { result = append(result, []byte("
\n")...)
			} else {
				result = append(result, []byte("
\n")...) } continue } if preformatted { result = append(result, line...) result = append(result, []byte("\n")...) continue } if l >= 7 && bytes.HasPrefix(line, []byte("=> ")) { split := bytes.SplitN(line[3:], []byte(" "), 2) if len(split) != 2 { split = bytes.SplitN(line[3:], []byte("\t"), 2) } if len(split) == 2 { link := append([]byte(``)...) link = append(link, split[1]...) link = append(link, []byte(``)...) result = append(result, link...) result = append(result, []byte("
")...) continue } } heading := 0 for i := 0; i < l; i++ { if line[i] == '#' { heading++ } else { break } } if heading > 0 { result = append(result, []byte(fmt.Sprintf("%s", heading, line[heading:], heading))...) continue } result = append(result, line...) result = append(result, []byte("
")...) } if preformatted { result = append(result, []byte("\n")...) } result = append([]byte(pageHeader), result...) result = append(result, []byte(pageFooter)...) return result }