Add helper module for defining variants

Author: javierav

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## Unreleased
+- Add helper module for defining variants
 
 ## 0.0.7 (2023-12-07)
 - Add support for compound variants ([#8](https://github.com/avo-hq/class_variants/pull/8))

lib/class_variants.rb

@@ -1,6 +1,7 @@
 require "class_variants/version"
 require "class_variants/action_view/helpers"
 require "class_variants/instance"
+require "class_variants/helper"
 require "class_variants/railtie" if defined?(Rails)
 
 module ClassVariants

lib/class_variants/helper.rb

@@ -0,0 +1,23 @@
+module ClassVariants
+  module Helper
+    module ClassMethods
+      def class_variants(...)
+        @_class_variants_instance = ClassVariants.build(...)
+      end
+
+      def _class_variants_instance
+        @_class_variants_instance
+      end
+    end
+
+    def self.included(base)
+      base.extend(ClassMethods)
+    end
+
+    def class_variants(...)
+      raise "You must configure class_variants in class definition" unless self.class._class_variants_instance
+
+      self.class._class_variants_instance.render(...)
+    end
+  end
+end

test/helper_test.rb

@@ -0,0 +1,13 @@
+require "test_helper"
+
+class HelperTest < Minitest::Test
+  class DemoClass
+    include ClassVariants::Helper
+
+    class_variants "rounded border"
+  end
+
+  def test_call_from_instance
+    assert_equal "rounded border", DemoClass.new.class_variants
+  end
+end