implemented link verification before opening new tabs

interfacer/src/browsh/browsh.go

@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io/ioutil"
+	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -191,9 +192,15 @@ func ttyEntry() {
 // MainEntry decides between running Browsh as a CLI app or as an HTTP web server
 func MainEntry() {
 	pflag.Parse()
-	if pflag.NArg() == 0 {
-		pflag.Usage()
-		os.Exit(1)
+	// validURL contains array of valid user inputted links.
+	var validURL []string
+	if pflag.NArg() != 0 {
+		for i := 0; i < len(pflag.Args()); i++ {
+			u, _ := url.ParseRequestURI(pflag.Args()[i])
+			if u != nil {
+				validURL = append(validURL, pflag.Args()[i])
+			}
+		}
 	}
 	Initialise()
 	if viper.GetBool("version") {