Moving go code to subdir.

code/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+        "flag"
+
+	"github.com/joho/godotenv"
+
+	"darjeeling.systemec.nl/rhouben/fibonacci/functions"
+)
+
+func main() {
+	var port_number int = 8098 // hard default
+	var error error
+	var bind_socket string
+	var seq, port int
+
+	error = godotenv.Load() // Load .env file
+	if error != nil {
+		fmt.Printf("Error trying to load .env file: %s\n", error)
+	}
+	port_arg := os.Getenv("FIB_PORT")
+	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",
+				port_arg,
+				error)
+			os.Exit(0)
+		}
+	}
+	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)
+		}
+	}
+}