weather-cli/cmd/menu.go

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")
		}
	}

}