FEATURE: Let plugins register themes easily

lib/plugin/instance.rb

@@ -2,6 +2,7 @@ require 'digest/sha1'
 require 'fileutils'
 require_dependency 'plugin/metadata'
 require_dependency 'plugin/auth_provider'
+require_dependency 'plugin/theme'
 
 class Plugin::CustomEmoji
   def self.cache_key
@@ -24,7 +25,13 @@ class Plugin::Instance
   attr_reader :admin_route
 
   # Memoized array readers
-  [:assets, :auth_providers, :color_schemes, :initializers, :javascripts, :styles].each do |att|
+  [:assets,
+   :auth_providers,
+   :color_schemes,
+   :initializers,
+   :javascripts,
+   :styles,
+   :themes].each do |att|
     class_eval %Q{
       def #{att}
         @#{att} ||= []
@@ -173,6 +180,10 @@ class Plugin::Instance
     end
   end
 
+  def directory
+    File.dirname(path)
+  end
+
   def auto_generated_path
     File.dirname(path) << "/auto_generated"
   end
@@ -244,6 +255,19 @@ class Plugin::Instance
     Plugin::CustomEmoji.register(name, url)
   end
 
+  def register_theme(name)
+    return unless enabled?
+
+    theme = Plugin::Theme.new(self, name)
+    yield theme
+    themes << theme
+  end
+
+  # def register_public
+  #   return unless enabled?
+  #
+  # end
+
   def automatic_assets
     css = styles.join("\n")
     js = javascripts.join("\n")

lib/plugin/theme.rb

@@ -0,0 +1,32 @@
+class Plugin::Theme
+  attr_reader :color_scheme
+
+  def initialize(plugin, name)
+    @plugin = plugin
+    @name = name
+  end
+
+  def css(name)
+    @plugin.register_asset("stylesheets/#{name}.scss")
+  end
+
+  def set_color_scheme(scheme)
+    @color_scheme = scheme
+  end
+
+  def register_public
+    public_dir = "#{@plugin.directory}/public"
+    if File.exist?(public_dir)
+      if Rails.env.development?
+        Rails.application.config.before_initialize do |app|
+          app.middleware.insert_before(
+            ::ActionDispatch::Static,
+            ::ActionDispatch::Static,
+            public_dir
+          )
+        end
+      end
+    end
+  end
+end
+