config: give config questions default values - fixes #3672

fs/config/config.go

@@ -638,11 +638,16 @@ func ReadNonEmptyLine(prompt string) string {
 	return result
 }
 
-// Command - choose one
-func Command(commands []string) byte {
+// CommandDefault - choose one.  If return is pressed then it will
+// chose the defaultIndex if it is >= 0
+func CommandDefault(commands []string, defaultIndex int) byte {
 	opts := []string{}
-	for _, text := range commands {
-		fmt.Printf("%c) %s\n", text[0], text[1:])
+	for i, text := range commands {
+		def := ""
+		if i == defaultIndex {
+			def = " (default)"
+		}
+		fmt.Printf("%c) %s%s\n", text[0], text[1:], def)
 		opts = append(opts, text[:1])
 	}
 	optString := strings.Join(opts, "")
@@ -650,6 +655,9 @@ func Command(commands []string) byte {
 	for {
 		fmt.Printf("%s> ", optHelp)
 		result := strings.ToLower(ReadLine())
+		if len(result) == 0 && defaultIndex >= 0 {
+			return optString[defaultIndex]
+		}
 		if len(result) != 1 {
 			continue
 		}
@@ -660,11 +668,20 @@ func Command(commands []string) byte {
 	}
 }
 
+// Command - choose one
+func Command(commands []string) byte {
+	return CommandDefault(commands, -1)
+}
+
 // Confirm asks the user for Yes or No and returns true or false
 //
-// If AutoConfirm is set, it will return true
-func Confirm() bool {
-	return Command([]string{"yYes", "nNo"}) == 'y'
+// If the user presses enter then the Default will be used
+func Confirm(Default bool) bool {
+	defaultIndex := 0
+	if !Default {
+		defaultIndex = 1
+	}
+	return CommandDefault([]string{"yYes", "nNo"}, defaultIndex) == 'y'
 }
 
 // ConfirmWithConfig asks the user for Yes or No and returns true or
@@ -691,7 +708,7 @@ func ConfirmWithConfig(m configmap.Getter, configName string, Default bool) bool
 		fmt.Printf("Auto confirm is set: answering %s, override by setting config parameter %s=%v\n", answer, configName, !Default)
 		return Default
 	}
-	return Confirm()
+	return Confirm(Default)
 }
 
 // Choose one of the defaults or type a new string if newOk is set
@@ -800,7 +817,7 @@ func ShowRemote(name string) {
 // OkRemote prints the contents of the remote and ask if it is OK
 func OkRemote(name string) bool {
 	ShowRemote(name)
-	switch i := Command([]string{"yYes this is OK", "eEdit this remote", "dDelete this remote"}); i {
+	switch i := CommandDefault([]string{"yYes this is OK", "eEdit this remote", "dDelete this remote"}, 0); i {
 	case 'y':
 		return true
 	case 'e':
@@ -870,12 +887,14 @@ func ChooseOption(o *fs.Option, name string) string {
 	fmt.Println(o.Help)
 	if o.IsPassword {
 		actions := []string{"yYes type in my own password", "gGenerate random password"}
+		defaultAction := -1
 		if !o.Required {
+			defaultAction = len(actions)
 			actions = append(actions, "nNo leave this optional password blank")
 		}
 		var password string
 		var err error
-		switch i := Command(actions); i {
+		switch i := CommandDefault(actions, defaultAction); i {
 		case 'y':
 			password = ChangePassword("the")
 		case 'g':
@@ -890,7 +909,7 @@ func ChooseOption(o *fs.Option, name string) string {
 				fmt.Printf("Use this password? Please note that an obscured version of this \npassword (and not the " +
 					"password itself) will be stored under your \nconfiguration file, so keep this generated password " +
 					"in a safe place.\n")
-				if Confirm() {
+				if Confirm(true) {
 					break
 				}
 			}
@@ -1095,7 +1114,7 @@ func editOptions(ri *fs.RegInfo, name string, isNew bool) {
 				break
 			}
 			fmt.Printf("Edit advanced config? (y/n)\n")
-			if !Confirm() {
+			if !Confirm(false) {
 				break
 			}
 		}
@@ -1110,7 +1129,7 @@ func editOptions(ri *fs.RegInfo, name string, isNew bool) {
 				if !isNew {
 					fmt.Printf("Value %q = %q\n", option.Name, FileGet(name, option.Name))
 					fmt.Printf("Edit? (y/n)>\n")
-					if !Confirm() {
+					if !Confirm(false) {
 						continue
 					}
 				}