Move main menu to separate file

cmd/menu.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+)
+
+func mainMenu(app *application) {
+
+	// Display main menu
+	fmt.Println("\n=====================================================")
+	fmt.Printf("| Welcome to the OpenWeatherMap-gRPC Client! v%s |\n", app.Version)
+	fmt.Println("=====================================================")
+
+	fmt.Printf("New in version %s:\n", app.Version)
+	fmt.Println(" - Advanced option: Get historical data back to 1972")
+	fmt.Println("New in version 0.1.0")
+	fmt.Println(" - Default option: Automatically determine location")
+	fmt.Println(" - Advanced option: Enter exact location for anywhere in the world")
+	fmt.Println(" - Advanced option: Change back and forth between imperial and metric units of measurement")
+
+	var option string
+	// Menu loop
+	for option != "0" {
+		fmt.Print("\nMain Menu\n---------\n\n")
+		fmt.Println("1. Today's forecast (use current location, default)")
+		fmt.Println("2. Advanced options (Change units, precise location, etc.)")
+		fmt.Print("0. Exit\n\n")
+
+		// Read user input
+		reader := bufio.NewReader(os.Stdin)
+		input, err := reader.ReadString('\n')
+		if err != nil {
+			log.Println(err)
+		}
+		option = strings.TrimSuffix(input, "\n")
+
+		// Check user input
+		if option == "1" || option == "" {
+			getLocation(app)
+			getCurrent(app)
+			printWeather(app)
+		} else if option == "2" {
+			advancedMenu(app)
+		} else if option == "0" {
+			return
+		} else {
+			fmt.Print("\nOops! An error occurred, please choose a valid option.\n\n")
+		}
+	}
+
+}