Support answerdiff to match answer{clean,edit}

cmd.go

@@ -262,6 +262,10 @@ func handleConfig(option, value string) bool {
 		config.AnswerClean = value
 	case "noanswerclean":
 		config.AnswerClean = ""
+	case "answerdiff":
+		config.AnswerDiff = value
+	case "noanswerdiff":
+		config.AnswerDiff = ""
 	case "answeredit":
 		config.AnswerEdit = value
 	case "noansweredit":

config.go

@@ -45,6 +45,7 @@ type Configuration struct {
 	ReDownload    string `json:"redownload"`
 	ReBuild       string `json:"rebuild"`
 	AnswerClean   string `json:"answerclean"`
+	AnswerDiff    string `json:"answerdiff"`
 	AnswerEdit    string `json:"answeredit"`
 	AnswerUpgrade string `json:"answerupgrade"`
 	GitBin        string `json:"gitbin"`
@@ -167,6 +168,7 @@ func defaultSettings(config *Configuration) {
 	config.ReDownload = "no"
 	config.ReBuild = "no"
 	config.AnswerClean = ""
+	config.AnswerDiff = ""
 	config.AnswerEdit = ""
 	config.AnswerUpgrade = ""
 	config.GitClone = true

install.go

@@ -477,19 +477,25 @@ func diffNumberMenu(pkgs []*rpc.Pkg, bases map[string][]*rpc.Pkg, installed stri
 
 func editDiffNumberMenu(pkgs []*rpc.Pkg, bases map[string][]*rpc.Pkg, installed stringSet, diff bool) ([]*rpc.Pkg, error) {
 	toEdit := make([]*rpc.Pkg, 0)
+	var editInput string
+	var err error
+
+	fmt.Println(bold(green(arrow) + cyan(" [N]one ") + "[A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)"))
 
 	if diff {
 		fmt.Println(bold(green(arrow + " Diffs to show?")))
+		fmt.Print(bold(green(arrow + " ")))
+		editInput, err = getInput(config.AnswerDiff)
+		if err != nil {
+			return nil, err
+		}
 	} else {
 		fmt.Println(bold(green(arrow + " PKGBUILDs to edit?")))
-	}
-	fmt.Println(bold(green(arrow) + cyan(" [N]one ") + "[A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)"))
-
-	fmt.Print(bold(green(arrow + " ")))
-
-	editInput, err := getInput(config.AnswerEdit)
-	if err != nil {
-		return nil, err
+		fmt.Print(bold(green(arrow + " ")))
+		editInput, err = getInput(config.AnswerEdit)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	eInclude, eExclude, eOtherInclude, eOtherExclude := parseNumberMenu(editInput)

parser.go

@@ -469,6 +469,8 @@ func hasParam(arg string) bool {
 		return true
 	case "answerclean":
 		return true
+	case "answerdiff":
+		return true
 	case "answeredit":
 		return true
 	case "answerupgrade":