documents ip command

Author: martinusso

README.md

@@ -164,6 +164,29 @@ BRL: 4.05 (USD 0.25), EUR: 0.90 (USD 1.12), GBP: 0.76 (USD 1.31)
   -h, --help   help for exchange
 ```
 
+### ip
+
+IP geolocation.
+It provides a simple IP to country, state and city mapping. Using db-ip.com/api.
+
+_Copies automatically the output to the clipboard._
+
+##### Usage:
+
+```
+~ zx ip 8.8.8.8
+IP: 8.8.8.8
+Continent: (SA) South America
+Country: (BR) Brazil
+City: Vitória (Espírito Santo)
+```
+
+##### Flags:
+```
+  -h, --help   help for ip
+```
+
+
 ### jwt
 
 Decode a JWT token.

cmd/ip.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/martinusso/zx/internal/clipboard"
@@ -19,8 +20,7 @@ type ipResponse struct {
 }
 
 var (
-	inputIP string
-	ipURL   = "https://api.db-ip.com/v2/free"
+	ipURL = "https://api.db-ip.com/v2/free"
 
 	ipCmd = &cobra.Command{
 		Use:   "ip",
@@ -40,16 +40,14 @@ It provides a simple IP to country, state and city mapping. Using db-ip.com/api.
 )
 
 func init() {
-	ipCmd.Flags().StringVar(&inputIP, "ip", "", "IP")
 	rootCmd.AddCommand(ipCmd)
 }
 
 func runIP(args []string) (string, error) {
-	if inputIP == "" {
-		if len(args) > 0 {
-			inputIP = args[0]
-		}
+	if len(args) != 1 {
+		return "", errors.New(emptyInput)
 	}
+	inputIP := args[0]
 
 	url := fmt.Sprintf("%s/%s", ipURL, inputIP)