ADD HelperMacro interface for better consistency

Author: riccardodallavia

Diff for: README.md

@@ -232,14 +232,16 @@ hlp()->sanitizeUrl('') // returns an empty string
 
 If needed, you can easily add your own helper methods.
 
-All you have to do is define your custom helper method using an invokable class:
+All you have to do is define your custom helper class and implement the `HelperMacro` interface:
 
 ```php
 <?php
 
 namespace App\Helpers\Macros;
 
-class Ping
+use Maize\Helpers\HelperMacro;
+
+class Ping implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/HelperMacro.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Maize\Helpers;
+
+interface HelperMacro
+{
+    public function __invoke(): \Closure;
+}

Diff for: src/Macros/AnonymizeFilename.php

@@ -3,8 +3,9 @@
 namespace Maize\Helpers\Macros;
 
 use Illuminate\Support\Str;
+use Maize\Helpers\HelperMacro;
 
-class AnonymizeFilename
+class AnonymizeFilename implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/ClassUsesTrait.php

@@ -2,7 +2,9 @@
 
 namespace Maize\Helpers\Macros;
 
-class ClassUsesTrait
+use Maize\Helpers\HelperMacro;
+
+class ClassUsesTrait implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/InstanceofTypes.php

@@ -3,8 +3,9 @@
 namespace Maize\Helpers\Macros;
 
 use Illuminate\Support\Arr;
+use Maize\Helpers\HelperMacro;
 
-class InstanceofTypes
+class InstanceofTypes implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/IsUrl.php

@@ -2,7 +2,9 @@
 
 namespace Maize\Helpers\Macros;
 
-class IsUrl
+use Maize\Helpers\HelperMacro;
+
+class IsUrl implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/ModelKeyName.php

@@ -3,8 +3,9 @@
 namespace Maize\Helpers\Macros;
 
 use Illuminate\Database\Eloquent\Model;
+use Maize\Helpers\HelperMacro;
 
-class ModelKeyName
+class ModelKeyName implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/MorphClassOf.php

@@ -3,8 +3,9 @@
 namespace Maize\Helpers\Macros;
 
 use Illuminate\Database\Eloquent\Model;
+use Maize\Helpers\HelperMacro;
 
-class MorphClassOf
+class MorphClassOf implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/PaginationLimit.php

@@ -2,7 +2,9 @@
 
 namespace Maize\Helpers\Macros;
 
-class PaginationLimit
+use Maize\Helpers\HelperMacro;
+
+class PaginationLimit implements HelperMacro
 {
     public function __invoke(): \Closure
     {

Diff for: src/Macros/SanitizeUrl.php

@@ -3,8 +3,9 @@
 namespace Maize\Helpers\Macros;
 
 use Illuminate\Support\Str;
+use Maize\Helpers\HelperMacro;
 
-class SanitizeUrl
+class SanitizeUrl implements HelperMacro
 {
     public function __invoke(): \Closure
     {