Extract next link if there is one

go/unpaginate/unpaginate.go

	"fmt"
	"net/http"
	"os"
	"strings"
)
func main() {
		os.Exit(1)
	}
	os.Stdout.WriteString("\n]")
	os.Stdout.WriteString("\n]\n")
	next := ""
	links := res.Header.Get("Link")
	if links != "" {
		for _, link := range strings.Split(links, ",") {
			link := strings.TrimSpace(link)
			start := strings.Index(link, "<")
			end := strings.Index(link, ">")
			if start != -1 && end != -1 && start < end &&
				strings.HasSuffix(link, "rel=\"next\"") {
				next = link[start+1 : end]
				break
			}
		}
	}
	if next != "" {
		fmt.Fprintf(os.Stderr, next)
	}
}