Added unit tests and workflow call for same

main.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+        "flag"
 
 	"github.com/joho/godotenv"
 
@@ -15,7 +16,7 @@ func main() {
 	var port_number int = 8098 // hard default
 	var error error
 	var bind_socket string
-	fmt.Println("Hello, world. I'm teaching myself Go.")
+	var seq, port int
 
 	error = godotenv.Load() // Load .env file
 	if error != nil {
@@ -23,16 +24,7 @@ func main() {
 	}
 	port_arg := os.Getenv("FIB_PORT")
 	if port_arg != "" {
-		fmt.Printf("Loaded port value '%s' from environment.\n",
-			port_arg)
-	}
-	if len(os.Args) > 1 { // commandline overrules env
-		port_arg = os.Args[1]
-		fmt.Printf("Loading port value '%s' from command line.\n",
-			port_arg)
-	}
-
-	if port_arg != "" {
+		fmt.Printf("Loaded port value '%s' from environment.\n",port_arg)
 		port_number, error = strconv.Atoi(port_arg)
 		if error != nil {
 			fmt.Printf("I had an error trying to parse '%s' into a number: %s\n",
@@ -41,9 +33,28 @@ func main() {
 			os.Exit(0)
 		}
 	}
-	bind_socket = fmt.Sprintf(":%d", port_number)
-	http.HandleFunc("/fibonacci", functions.HttFibonacci)
-	http.HandleFunc("/sum", functions.HttSum)
-	fmt.Printf("Listening on port %d...\n", port_number)
-	http.ListenAndServe(bind_socket, nil)
+	flag.IntVar(&port, "port", 8098, 
+		fmt.Sprintf("Port number to bind to, default %d", port_number))
+	flag.IntVar(&seq, "number", 0, 
+		"Fibonacci sequence value to calculate")
+	flag.Parse()
+
+	if functions.FlagSet("port") { // Command line overrides env
+		port_number = port
+	}
+
+	if !functions.FlagSet("number") {
+		fmt.Printf("Listening on port %d...\n", port_number)
+		bind_socket = fmt.Sprintf(":%d", port_number)
+		http.HandleFunc("/fibonacci", functions.HttFibonacci)
+		http.HandleFunc("/sum", functions.HttSum)
+		http.ListenAndServe(bind_socket, nil)
+	} else {
+		value, error := functions.MyFibonacci(seq)
+		if error != nil {
+			fmt.Printf("Failed to Fibonacci %d: %s", seq, error)
+		} else {
+			fmt.Printf("%d", value)
+		}
+	}
 }