add update confirm

gosuv.go

@@ -47,6 +47,16 @@ func equinoxUpdate(channel string) error {
 		return err
 	}
 
+	fmt.Println("New version available!")
+	fmt.Println("Version:", resp.ReleaseVersion)
+	fmt.Println("Name:", resp.ReleaseTitle)
+	fmt.Println("Details:", resp.ReleaseDescription)
+	fmt.Printf("Would you like to update [y/n]? ")
+
+	if !askForConfirmation() {
+		return nil
+	}
+	//fmt.Printf("New version available: %s downloading ... \n", resp.ReleaseVersion)
 	// fetch the update and apply it
 	err = resp.Apply()
 	if err != nil {

utils.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"runtime"
 	"time"
@@ -49,3 +50,44 @@ func UserHomeDir() string {
 	}
 	return os.Getenv("HOME")
 }
+
+// askForConfirmation uses Scanln to parse user input. A user must type in "yes" or "no" and
+// then press enter. It has fuzzy matching, so "y", "Y", "yes", "YES", and "Yes" all count as
+// confirmations. If the input is not recognized, it will ask again. The function does not return
+// until it gets a valid response from the user. Typically, you should use fmt to print out a question
+// before calling askForConfirmation. E.g. fmt.Println("WARNING: Are you sure? (yes/no)")
+func askForConfirmation() bool {
+	var response string
+	_, err := fmt.Scanln(&response)
+	if err != nil {
+		log.Fatal(err)
+	}
+	okayResponses := []string{"y", "Y", "yes", "Yes", "YES"}
+	nokayResponses := []string{"n", "N", "no", "No", "NO"}
+	if containsString(okayResponses, response) {
+		return true
+	} else if containsString(nokayResponses, response) {
+		return false
+	} else {
+		fmt.Println("Please type yes or no and then press enter:")
+		return askForConfirmation()
+	}
+}
+
+// You might want to put the following two functions in a separate utility package.
+
+// posString returns the first index of element in slice.
+// If slice does not contain element, returns -1.
+func posString(slice []string, element string) int {
+	for index, elem := range slice {
+		if elem == element {
+			return index
+		}
+	}
+	return -1
+}
+
+// containsString returns true iff slice contains element
+func containsString(slice []string, element string) bool {
+	return !(posString(slice, element) == -1)
+}