TEST: Allow adding custom modifiers

lib/phlexy_ui/base.rb

@@ -18,6 +18,7 @@ def generate_classes!(
       modifiers_map: {}
     )
       ClassList.new(
+        component: self,
         component_html_class:,
         base_modifiers:,
         options:,

lib/phlexy_ui/class_list.rb

@@ -2,7 +2,13 @@ module PhlexyUI
   class ClassList
     RESPONSIVE_PREFIXES = %i[sm md lg].freeze
 
-    def initialize(component_html_class: nil, base_modifiers: [], options: {}, modifiers_map: {})
+    def initialize(
+      component:,
+      component_html_class: nil,
+      base_modifiers: [],
+      options: {},
+      modifiers_map: {}
+    )
       @component_html_class = component_html_class
       @base_modifiers = base_modifiers
       @options = options
@@ -22,10 +28,17 @@ def to_a
 
     attr_reader :component_html_class, :base_modifiers, :options, :modifiers_map
 
-    def selected_base_modifiers_classes
+    def selected_base_modifiers
       base_modifiers.select { |modifier| modifiers_map.key?(modifier) }
     end
 
+    def selected_custom_modifiers
+      base_modifiers.select do |modifier|
+        PhlexyUI.configuration.modifiers.key?(modifier, component:) ||
+          PhlexyUI.configuration.modifiers.key?(modifier)
+      end
+    end
+
     def add_component_class(classes)
       return unless component_html_class
 
@@ -35,7 +48,13 @@ def add_component_class(classes)
     def add_selected_modifiers_classes(classes)
       classes.concat(
         html_classes_for_modifiers(
-          selected_base_modifiers_classes
+          selected_base_modifiers
+        )
+      )
+
+      classes.concat(
+        html_classes_for_modifiers(
+          selected_custom_modifiers
         )
       )
     end

lib/phlexy_ui/configurable.rb

@@ -10,12 +10,41 @@ def configuration
       @configuration ||= Configuration.new
     end
 
+    class Modifiers
+      def initialize
+        @modifiers = {}
+      end
+
+      def add(modifier, classes:, component: nil)
+        @modifiers[component] ||= {}
+        @modifiers[component][modifier] = classes
+      end
+
+      def remove(modifier, component: nil)
+        @modifiers[component] ||= {}
+        @modifiers[component]&.delete(modifier)
+      end
+
+      def key?(modifier, component: nil)
+        @modifiers[component]&.key?(modifier)
+      end
+
+      def reset
+        @modifiers = {}
+        true
+      end
+    end
+
     class Configuration
       attr_accessor :prefix
 
       def initialize
         @prefix = nil
       end
+
+      def modifiers
+        @modifiers ||= Modifiers.new
+      end
     end
   end
 end

spec/lib/phlexy_ui/card_spec.rb

@@ -107,6 +107,81 @@
     end
   end
 
+  describe "custom modifiers" do
+    context "when there's a custom modifier for the component" do
+      around do |example|
+        PhlexyUI.configure do |config|
+          config.modifiers.add(
+            :my_modifier,
+            component: PhlexyUI::Card,
+            classes: "w-96 shadow-xl"
+          )
+        end
+
+        example.run
+
+        PhlexyUI.configure do |config|
+          config.modifiers.remove(:my_modifier, component: PhlexyUI::Card)
+        end
+      end
+
+      subject(:output) do
+        render described_class.new(:my_modifier)
+      end
+
+      it "renders it correctly" do
+        expected_html = html <<~HTML
+          <section class="card w-96 shadow-xl"></section>
+        HTML
+
+        expect(output).to eq(expected_html)
+      end
+    end
+
+    context "when there's a custom modifier without a specific component" do
+      around do |example|
+        PhlexyUI.configure do |config|
+          config.modifiers.add(
+            :my_modifier,
+            classes: "w-96 shadow-xl"
+          )
+        end
+
+        example.run
+
+        PhlexyUI.configure do |config|
+          config.modifiers.remove(:my_modifier)
+        end
+      end
+
+      subject(:output) do
+        render described_class.new(:my_modifier)
+      end
+
+      it "renders it correctly" do
+        expected_html = html <<~HTML
+          <section class="card w-96 shadow-xl"></section>
+        HTML
+
+        expect(output).to eq(expected_html)
+      end
+    end
+
+    context "when there's no custom modifier" do
+      subject(:output) do
+        render described_class.new(:my_modifier)
+      end
+
+      it "does not render it" do
+        expected_html = html <<~HTML
+          <section class="card"></section>
+        HTML
+
+        expect(output).to eq(expected_html)
+      end
+    end
+  end
+
   describe "responsiveness" do
     %i[sm md lg].each do |viewport|
       context "when given an :#{viewport} responsive option as a single argument" do
@@ -181,6 +256,51 @@
           expect(output).to eq(expected_html)
         end
       end
+
+      context "when there are custom modifiers" do
+        around do |example|
+          PhlexyUI.configure do |config|
+            config.modifiers.add(
+              :my_modifier,
+              component: PhlexyUI::Card,
+              classes: "w-96 shadow-xl"
+            )
+
+            config.modifiers.add(
+              :my_other_modifier,
+              classes: "p-4 rounded-box"
+            )
+          end
+
+          example.run
+
+          PhlexyUI.configure do |config|
+            config.modifiers.remove(:my_modifier, component: PhlexyUI::Card)
+            config.modifiers.remove(:my_other_modifier)
+          end
+        end
+
+        subject(:output) do
+          render described_class.new(
+            :my_modifier,
+            viewport => :my_other_modifier
+          )
+        end
+
+        it "renders it separately with a responsive prefix" do
+          expected_html = html <<~HTML
+            <section class="
+              card
+              w-96
+              shadow-xl
+              #{viewport}:rounded-box
+              #{viewport}:p-4>
+            </section>
+          HTML
+
+          expect(output).to eq(expected_html)
+        end
+      end
     end
   end