rails--rails/railties/lib/rails/tasks/routes.rake

require "active_support/deprecation"
require "active_support/core_ext/string/strip" # for strip_heredoc
require "optparse"

desc "Print out all defined routes in match order, with names. Target specific controller with -c option, or grep routes using -g option"
task routes: :environment do
  all_routes = Rails.application.routes.routes
  require "action_dispatch/routing/inspector"
  inspector = ActionDispatch::Routing::RoutesInspector.new(all_routes)
  if ARGV.any?{ |argv| argv.start_with? "CONTROLLER" }
    puts <<-eow.strip_heredoc
      Passing `CONTROLLER` to `bin/rails routes` is deprecated and will be removed in Rails 5.1.
      Please use `bin/rails routes -c controller_name` instead.
    eow
  end

  routes_filter = nil
  routes_filter = { controller: ENV["CONTROLLER"] } if ENV["CONTROLLER"]

  OptionParser.new do |opts|
    opts.banner = "Usage: rails routes [options]"

    Rake.application.standard_rake_options.each { |args| opts.on(*args) }

    opts.on("-c CONTROLLER") do |controller|
      routes_filter = { controller: controller }
    end

    opts.on("-g PATTERN") do |pattern|
      routes_filter = pattern
    end

  end.parse!(ARGV.reject { |x| x == "routes" })

  puts inspector.format(ActionDispatch::Routing::ConsoleFormatter.new, routes_filter)

  exit 0 # ensure extra arguments aren't interpreted as Rake tasks
end