Support opening the archived page

go/archive/archive.go

import (
	"crypto/rand"
	"encoding/json"
	"flag"
	"fmt"
	"net/url"
	"os"
	"path/filepath"
)
var flags struct {
	open bool
}
type Archive struct {
	Mappings map[string]string `json:"mappings"`
}
func init() {
	flag.BoolVar(&flags.open, "open", false, "Open the archived page")
}
func main() {
	u, err := url.Parse(os.Args[1])
	flag.Parse()
	u, err := url.Parse(flag.Arg(0))
	if err != nil {
		exit("url.Parse", err)
	}
	p, ok := archive.Mappings[u.String()]
	if ok {
		fmt.Println("==> Archived at", p)
		if flags.open {
			fmt.Println("==> Opening archive of", u)
			open(u, p)
		}
		return
	}
	f.Close()
	fmt.Println("==> Archived at", p)
	if flags.open {
		fmt.Println("==> Opening archive of", u)
		open(u, p)
	}
}
func open(u *url.URL, path string) {
	cmd := exec.Command("xdg-open", path)
	cmd.Stderr = os.Stderr
	cmd.Stdout = os.Stdout
	err := cmd.Start()
	if err != nil {
		exit("cmd.Start", err)
	}
}
func exit(msg string, err error) {