Add patch for config/boot and install script to apply it

lib/colorized_routes/patches/boot.rb

@@ -0,0 +1,5 @@
+require 'rails/commands/routes/routes_command'
+
+::Rails::Command::RoutesCommand.class_eval do
+  class_option :colorized, type: :boolean, aliases: "-C", desc: "Print routes with a colorized version"
+end

lib/colorized_routes/railtie.rb

@@ -2,5 +2,8 @@ module ColorizedRoutes
   class Railtie < ::Rails::Railtie
     ::Rails::Command::RoutesCommand.prepend ColorizedRoutes::Command::RoutesCommand
 
+    rake_tasks do
+      load 'tasks/colorized_routes.rake'
+    end
   end
 end

lib/install/install.rb

@@ -0,0 +1,4 @@
+BOOT_PATH = Rails.root.join("config/boot.rb")
+
+say "Load `rails routes` patch on boot"
+append_to_file BOOT_PATH.to_s, "require 'colorized_routes/patches/boot'"

lib/tasks/colorized_routes.rake

@@ -0,0 +1,6 @@
+namespace :colorized_routes do
+  desc "Setup Colorized Routes for the app"
+  task :install do
+    system RbConfig.ruby, "./bin/rails", "app:template", "LOCATION=#{File.expand_path("../install/install.rb", __dir__)}"
+  end
+end

test/dummy/config/boot.rb

@@ -3,3 +3,6 @@
 
 require "bundler/setup" if File.exist?(ENV["BUNDLE_GEMFILE"])
 $LOAD_PATH.unshift File.expand_path("../../../lib", __dir__)
+
+require 'rails/command'
+require 'colorized_routes/patches/boot'