[feature] Allow configuring caching

As with Rails, this allows to configure the cache store
through `config.rails_heroicon_cache_store`

By default it is set to :memory_store.

Closes abeidahmed#48

README.md

@@ -107,6 +107,12 @@ passed into the `title` option will be rendered inside of a
 `<title>` tag within the rendered SVG, which modern browsers will lean on to
 display a tooltip on hover.
 
+### Caching
+
+Like with Rails, you can provide `config.rails_heroicon_cache_store` to change the cache store.
+
+By default, caching uses `:memory_store`
+
 ## Development
 
 - Clone the repo

lib/rails_heroicon/helper.rb

@@ -4,7 +4,6 @@ module RailsHeroicon
   module Helper
     include ActionView::Helpers::TagHelper
 
-    mattr_accessor :icon_cache, default: {}
     # To add a heroicon, call <tt><%= heroicon "icon_name" %></tt> on your erb template.
     # Head over to https://heroicons.com to view all the icons.
     #
@@ -38,13 +37,12 @@ module Helper
     # if <tt>aria-label</tt> is set, then <tt>role=img</tt> is set automatically.
     def heroicon(symbol, title: nil, **options)
       cache_key = [symbol, title, options]
-      return icon_cache[cache_key] if icon_cache[cache_key]
 
-      icon = RailsHeroicon.new(symbol, **options)
-      title_tag = content_tag(:title, title) if title
-      tag = content_tag(:svg, title_tag.to_s.html_safe + icon.svg_path.html_safe, icon.options)
-      icon_cache[cache_key] = tag
-      tag
+      ::RailsHeroicon.cache.fetch(cache_key) do
+        icon = RailsHeroicon.new(symbol, **options)
+        title_tag = content_tag(:title, title) if title
+        content_tag(:svg, title_tag.to_s.html_safe + icon.svg_path.html_safe, icon.options)
+      end
     end
   end
 end

lib/rails_heroicon/railtie.rb

@@ -1,9 +1,19 @@
 require_relative "helper"
 
 module RailsHeroicon
-  class Railtie < Rails::Railtie
+  class << self
+    attr_accessor :cache
+  end
+
+  class Railtie < ::Rails::Railtie
     initializer "rails_heroicon.helper" do
       ActionView::Base.send :include, Helper
     end
+
+    config.rails_heroicon_cache_store = :memory_store
+
+    initializer "rails_heroicon.cache" do
+      ::RailsHeroicon.cache = ActiveSupport::Cache.lookup_store(*config.rails_heroicon_cache_store)
+    end
   end
 end

test/rails_heroicon/helper_test.rb

@@ -4,6 +4,11 @@
 module RailsHeroicon
   class HelperTest < Minitest::Test
     include ::RailsHeroicon::Helper
+    include RunInitializer
+
+    def setup
+      run_initializer
+    end
 
     def test_attributes
       icon = heroicon("user", class: "text-red-600", data: {foo: "bar"})

test/rails_heroicon/rails_heroicon_test.rb

@@ -127,8 +127,8 @@ def test_solid_icon_stroke_width
 
     private
 
-    def icon(name: "user", **options)
-      RailsHeroicon.new(name, **options)
+    def icon(name: "user", **)
+      RailsHeroicon.new(name, **)
     end
   end
 end

test/rails_heroicon/railtie_test.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+module RailsHeroicon
+  class RailtieTest < Minitest::Test
+    include RunInitializer
+
+    def before_setup
+      save_cache_store
+    end
+
+    def setup
+      run_initializer
+    end
+
+    def teardown
+      reset_cache_store
+      run_initializer
+    end
+
+    class DefaultCacheStoreTest < RailtieTest
+      def test_default_config
+        assert_equal :memory_store, ::RailsHeroicon::Railtie.config.rails_heroicon_cache_store
+      end
+
+      def test_default_cache
+        assert_instance_of ActiveSupport::Cache::MemoryStore, ::RailsHeroicon.cache
+      end
+    end
+
+    class ChangeCacheStoreTest < RailtieTest
+      def setup
+        set_cache_store :null_store
+        super
+      end
+
+      def test_changed_cache
+        assert_instance_of ActiveSupport::Cache::NullStore, ::RailsHeroicon.cache
+      end
+    end
+  end
+end

test/test_helper.rb

@@ -2,3 +2,25 @@
 require "rails_heroicon"
 
 require "minitest/autorun"
+require "rails/railtie"
+require "rails_heroicon/railtie"
+
+module RunInitializer
+  def run_initializer
+    ::RailsHeroicon::Railtie.initializers.find { |i| i.name == "rails_heroicon.cache" }.bind(RailsHeroicon::Railtie).run
+  end
+
+  def set_cache_store(store)
+    ::RailsHeroicon::Railtie.config.rails_heroicon_cache_store = store
+  end
+
+  def save_cache_store
+    @icon_cache_store = ::RailsHeroicon::Railtie.config.rails_heroicon_cache_store
+  end
+
+  def reset_cache_store
+    raise "Cannot reset cache store, please set it before with #save_cache_store" unless instance_variable_defined?(:@icon_cache_store)
+
+    set_cache_store @icon_cache_store
+  end
+end