giplib: separate functions in lib and app

Signed-off-by: Nagy Károly Gábriel <k@jpi.io>

main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"git.jpi.io/karasz/gip/giplib"
+	"os"
+)
+
+var (
+	//Version contains the git hashtag injected by make
+	Version = "N/A"
+	//BuildTime contains the build timestamp injected by make
+	BuildTime = "N/A"
+)
+
+func main() {
+	var all bool
+	ptr4 := flag.Bool("4", false, "return only IPv4")
+	ptr6 := flag.Bool("6", false, "return only IPv6")
+	version := flag.Bool("v", false, "return version")
+
+	flag.Parse()
+
+	if *version {
+		fmt.Println(Version, " built on ", BuildTime)
+		os.Exit(0)
+	}
+
+	if *ptr4 == *ptr6 {
+		all = true
+	}
+	if all {
+		fmt.Println(giplib.GetIPv4())
+		fmt.Println(giplib.GetIPv6())
+		os.Exit(0)
+	}
+	if *ptr4 {
+		fmt.Println(giplib.GetIPv4())
+	}
+	if *ptr6 {
+		fmt.Println(giplib.GetIPv6())
+
+	}
+}