Provide jump option, but this dont work in WSL2

microsoft/WSL#8892

cmd/nixpkgs-url/main.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"os/exec"
+	"runtime"
 
 	nixurl "github.com/kachick/nixpkgs-url"
 )
@@ -18,6 +20,25 @@ var (
 	revision = "rev"
 )
 
+// https://stackoverflow.com/posts/39324149/revisions
+// open opens the specified URL in the default browser of the user.
+func open(url string) error {
+	var cmd string
+	var args []string
+
+	switch runtime.GOOS {
+	case "windows":
+		cmd = "cmd"
+		args = []string{"/c", "start"}
+	case "darwin":
+		cmd = "open"
+	default: // "linux", "freebsd", "openbsd", "netbsd"
+		cmd = "xdg-open"
+	}
+	args = append(args, url)
+	return exec.Command(cmd, args...).Start()
+}
+
 func main() {
 	const usage = `Usage: nixpkgs-url <subcommand> <flags>
 
@@ -31,6 +52,7 @@ $ nixpkgs-url -version`
 	currentFlag := detectCmd.Bool("current", false, "print current nixpath without bumping")
 	lastFlag := detectCmd.Bool("last", false, "print git head ref without bumping")
 	targetFlag := detectCmd.Bool("target", false, "print which file will be bumped")
+	jumpFlag := detectCmd.Bool("jump", false, "open github URL with current ref")
 
 	flag.Usage = func() {
 		// https://github.com/golang/go/issues/57059#issuecomment-1336036866
@@ -83,6 +105,14 @@ $ nixpkgs-url -version`
 				log.Fatalf("Getting the current version has been failed: %s", err.Error())
 			}
 			fmt.Println(current)
+
+			if *jumpFlag {
+				err = open("https://github.com/NixOS/nixpkgs/commit/" + current)
+				if err != nil {
+					log.Fatalf(err.Error())
+				}
+			}
+
 			return
 		}
 		last, err := nixurl.GetLastVersion()