Add options for rake routes task

Add two options: `-c` and `-g`.
`-g` option returns the urls name, verb and path fields that match the pattern.
`-c` option returns the urls for specific controller.

Fixes #18902, and Fixes #20420

[Anton Davydov & Vipul A M]

7 files changed, 163 insertions, 30 deletions

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index f6ffe45490..b2d9288eca 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,13 @@
+*   Add `-g` and `-c` (short for _grep_ and _controller_ respectively) options
+    to `bin/rake routes`. These options return the url `name`, `verb` and
+    `path` field that match the pattern or match a specific controller.
+
+    Deprecate `CONTROLLER` env variable in `bin/rake routes`.
+
+    See #18902.
+
+    *Anton Davydov* & *Vipul A M*
+    
 *   Response etags to always be weak: Prefixes 'W/' to value returned by
    `ActionDispatch::Http::Cache::Response#etag=`, such that etags set in
    `fresh_when` and `stale?` are weak.
diff --git a/actionpack/lib/action_dispatch/routing.rb b/actionpack/lib/action_dispatch/routing.rb
index d00b2c3eb5..6cde5b2900 100644
--- a/actionpack/lib/action_dispatch/routing.rb
+++ b/actionpack/lib/action_dispatch/routing.rb
@@ -239,7 +239,8 @@ module ActionDispatch
   #
   #   rails routes
   #
-  # Target specific controllers by prefixing the command with <tt>CONTROLLER=x</tt>.
+  # Target specific controllers by prefixing the command with <tt>--controller</tt> option
+  # - or its <tt>-c</tt> shorthand.
   #
   module Routing
     extend ActiveSupport::Autoload
diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index 69e6dd5215..1ca2a3b683 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -60,12 +60,11 @@ module ActionDispatch
       end
 
       def format(formatter, filter = nil)
-        routes_to_display = filter_routes(filter)
-
+        filter_options = normalize_filter(filter)
+        routes_to_display = filter_routes(filter_options)
         routes = collect_routes(routes_to_display)
-
         if routes.none?
-          formatter.no_routes(collect_routes(@routes), filter)
+          formatter.no_routes(collect_routes(@routes))
           return formatter.result
         end
 
@@ -82,10 +81,21 @@ module ActionDispatch
 
       private
 
-      def filter_routes(filter)
-        if filter
-          filter_name = filter.underscore.sub(/_controller$/, '')
-          @routes.select { |route| route.defaults[:controller] == filter_name }
+      def normalize_filter(filter)
+        if filter.is_a?(Hash) && filter[:controller]
+          {controller: /#{filter[:controller].downcase.sub(/_?controller\z/, '').sub('::', '/')}/}
+        elsif filter.is_a?(String)
+          {controller: /#{filter}/, action: /#{filter}/}
+        else
+          nil
+        end
+      end
+
+      def filter_routes(filter_options)
+        if filter_options
+          @routes.select do |route|
+            filter_options.any? { |default, filter| route.defaults[default] =~ filter }
+          end
         else
           @routes
         end
@@ -137,7 +147,7 @@ module ActionDispatch
         @buffer << draw_header(routes)
       end
 
-      def no_routes(routes, filter)
+      def no_routes(routes)
         @buffer <<
         if routes.none?
           <<-MESSAGE.strip_heredoc
@@ -145,8 +155,6 @@ module ActionDispatch
 
           Please add some routes in config/routes.rb.
           MESSAGE
-        elsif missing_controller?(filter)
-          "The controller #{filter} does not exist!"
         else
           "No routes were found for this controller"
         end
@@ -154,10 +162,6 @@ module ActionDispatch
       end
 
       private
-        def missing_controller?(controller_name)
-          [ controller_name.camelize, "#{controller_name.camelize}Controller" ].none?(&:safe_constantize)
-        end
-
         def draw_section(routes)
           header_lengths = ['Prefix', 'Verb', 'URI Pattern'].map(&:length)
           name_width, verb_width, path_width = widths(routes).zip(header_lengths).map(&:max)
diff --git a/actionpack/test/dispatch/routing/inspector_test.rb b/actionpack/test/dispatch/routing/inspector_test.rb
index 7382c267c7..f72a87b994 100644
--- a/actionpack/test/dispatch/routing/inspector_test.rb
+++ b/actionpack/test/dispatch/routing/inspector_test.rb
@@ -17,10 +17,10 @@ module ActionDispatch
         @set = ActionDispatch::Routing::RouteSet.new
       end
 
-      def draw(options = {}, &block)
+      def draw(options = nil, &block)
         @set.draw(&block)
         inspector = ActionDispatch::Routing::RoutesInspector.new(@set.routes)
-        inspector.format(ActionDispatch::Routing::ConsoleFormatter.new, options[:filter]).split("\n")
+        inspector.format(ActionDispatch::Routing::ConsoleFormatter.new, options).split("\n")
       end
 
       def test_displaying_routes_for_engines
@@ -297,7 +297,7 @@ module ActionDispatch
       end
 
       def test_routes_can_be_filtered
-        output = draw(filter: 'posts') do
+        output = draw('posts') do
           resources :articles
           resources :posts
         end
@@ -313,6 +313,26 @@ module ActionDispatch
                       "          DELETE /posts/:id(.:format)      posts#destroy"], output
       end
 
+      def test_routes_can_be_filtered_with_namespaced_controllers
+        output = draw('admin/posts') do
+          resources :articles
+          namespace :admin do
+            resources :posts
+          end
+        end
+
+        assert_equal ["         Prefix Verb   URI Pattern                     Controller#Action",
+                      "    admin_posts GET    /admin/posts(.:format)          admin/posts#index",
+                      "                POST   /admin/posts(.:format)          admin/posts#create",
+                      " new_admin_post GET    /admin/posts/new(.:format)      admin/posts#new",
+                      "edit_admin_post GET    /admin/posts/:id/edit(.:format) admin/posts#edit",
+                      "     admin_post GET    /admin/posts/:id(.:format)      admin/posts#show",
+                      "                PATCH  /admin/posts/:id(.:format)      admin/posts#update",
+                      "                PUT    /admin/posts/:id(.:format)      admin/posts#update",
+                      "                DELETE /admin/posts/:id(.:format)      admin/posts#destroy"], output
+      end
+
+
       def test_regression_route_with_controller_regexp
         output = draw do
           get ':controller(/:action)', controller: /api\/[^\/]+/, format: false
@@ -336,18 +356,18 @@ module ActionDispatch
       end
 
       def test_routes_with_undefined_filter
-        output = draw(:filter => 'Rails::MissingController') do
+        output = draw(controller: 'Rails::MissingController') do
           get 'photos/:id' => 'photos#show', :id => /[A-Z]\d{5}/
         end
 
         assert_equal [
-          "The controller Rails::MissingController does not exist!",
+          "No routes were found for this controller",
           "For more information about routes, see the Rails guide: http://guides.rubyonrails.org/routing.html."
         ], output
       end
 
       def test_no_routes_matched_filter
-        output = draw(:filter => 'rails/dummy') do
+        output = draw('rails/dummy') do
           get 'photos/:id' => 'photos#show', :id => /[A-Z]\d{5}/
         end
 
@@ -358,7 +378,7 @@ module ActionDispatch
       end
 
       def test_no_routes_were_defined
-        output = draw(:filter => 'Rails::DummyController') { }
+        output = draw('Rails::DummyController') {}
 
         assert_equal [
           "You don't have any routes defined!",
diff --git a/guides/source/routing.md b/guides/source/routing.md
index 5a745b10cd..d9e64d56ac 100644
--- a/guides/source/routing.md
+++ b/guides/source/routing.md
@@ -1136,10 +1136,21 @@ For example, here's a small section of the `rails routes` output for a RESTful r
 edit_user GET    /users/:id/edit(.:format) users#edit
 ```
 
-You may restrict the listing to the routes that map to a particular controller setting the `CONTROLLER` environment variable:
+You can search through your routes with the --grep option (-g for short). This outputs any routes that partially match the URL helper method name, the HTTP verb, or the URL path.
 
-```bash
-$ CONTROLLER=users bin/rails routes
+```
+$ bin/rake routes --grep new_comment
+$ bin/rake routes -g POST
+$ bin/rake routes -g admin
+```
+
+If you only want to see the routes that map to a specific controller, there's the --controller option (-c for short).
+
+```
+$ bin/rake routes --controller users
+$ bin/rake routes --controller admin/users
+$ bin/rake routes -c Comments
+$ bin/rake routes -c Articles::CommentsController
 ```
 
 TIP: You'll find that the output from `rails routes` is much more readable if you widen your terminal window until the output lines don't wrap.
diff --git a/railties/lib/rails/tasks/routes.rake b/railties/lib/rails/tasks/routes.rake
index 1815c2fdc7..499c434ffa 100644
--- a/railties/lib/rails/tasks/routes.rake
+++ b/railties/lib/rails/tasks/routes.rake
@@ -1,7 +1,35 @@
-desc 'Print out all defined routes in match order, with names. Target specific controller with CONTROLLER=x.'
+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 --controller option - or its -c shorthand.'
 task routes: :environment do
   all_routes = Rails.application.routes.routes
   require 'action_dispatch/routing/inspector'
   inspector = ActionDispatch::Routing::RoutesInspector.new(all_routes)
-  puts inspector.format(ActionDispatch::Routing::ConsoleFormatter.new, ENV['CONTROLLER'])
+  if ARGV.any?{ |argv| argv.start_with? 'CONTROLLER' }
+    puts <<-eow.strip_heredoc
+      Passing `CONTROLLER` to `bin/rake routes` is deprecated and will be removed in Rails 5.1.
+      Please use `bin/rake 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: rake routes [options]"
+    opts.on("-c", "--controller [CONTROLLER]") do |controller|
+      routes_filter = { controller: controller }
+    end
+
+    opts.on("-g", "--grep [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
diff --git a/railties/test/application/rake_test.rb b/railties/test/application/rake_test.rb
index b979ad64d1..7171aa6e1a 100644
--- a/railties/test/application/rake_test.rb
+++ b/railties/test/application/rake_test.rb
@@ -141,8 +141,67 @@ module ApplicationTests
         end
       RUBY
 
-      ENV['CONTROLLER'] = 'cart'
-      output = Dir.chdir(app_path){ `bin/rails routes` }
+      output = Dir.chdir(app_path){ `bin/rake routes CONTROLLER=cart` }
+      assert_equal ["Passing `CONTROLLER` to `bin/rake routes` is deprecated and will be removed in Rails 5.1.",
+                    "Please use `bin/rake routes -c controller_name` instead.",
+                    "Prefix Verb URI Pattern     Controller#Action",
+                    "  cart GET  /cart(.:format) cart#show\n"].join("\n"), output
+
+      output = Dir.chdir(app_path){ `bin/rails routes -c cart` }
+      assert_equal "Prefix Verb URI Pattern     Controller#Action\n  cart GET  /cart(.:format) cart#show\n", output
+    end
+
+    def test_rake_routes_with_namespaced_controller_environment
+      app_file "config/routes.rb", <<-RUBY
+        Rails.application.routes.draw do
+          namespace :admin do
+            resource :post
+          end
+        end
+      RUBY
+      expected_output = ["         Prefix Verb   URI Pattern                Controller#Action",
+                         "     admin_post POST   /admin/post(.:format)      admin/posts#create",
+                         " new_admin_post GET    /admin/post/new(.:format)  admin/posts#new",
+                         "edit_admin_post GET    /admin/post/edit(.:format) admin/posts#edit",
+                         "                GET    /admin/post(.:format)      admin/posts#show",
+                         "                PATCH  /admin/post(.:format)      admin/posts#update",
+                         "                PUT    /admin/post(.:format)      admin/posts#update",
+                         "                DELETE /admin/post(.:format)      admin/posts#destroy\n"].join("\n")
+
+      output = Dir.chdir(app_path){ `bin/rails routes -c Admin::PostController` }
+      assert_equal expected_output, output
+
+      output = Dir.chdir(app_path){ `bin/rails routes -c PostController` }
+      assert_equal expected_output, output
+    end
+
+    def test_rake_routes_with_global_search_key
+      app_file "config/routes.rb", <<-RUBY
+        Rails.application.routes.draw do
+          get '/cart', to: 'cart#show'
+          get '/basketball', to: 'basketball#index'
+        end
+      RUBY
+
+      output = Dir.chdir(app_path){ `bin/rake routes -g show` }
+      assert_equal "Prefix Verb URI Pattern     Controller#Action\n  cart GET  /cart(.:format) cart#show\n", output
+    end
+
+    def test_rake_routes_with_controller_search_key
+      app_file "config/routes.rb", <<-RUBY
+        Rails.application.routes.draw do
+          get '/cart', to: 'cart#show'
+          get '/basketball', to: 'basketball#index'
+        end
+      RUBY
+
+      output = Dir.chdir(app_path){ `bin/rake routes -c cart` }
+      assert_equal "Prefix Verb URI Pattern     Controller#Action\n  cart GET  /cart(.:format) cart#show\n", output
+
+      output = Dir.chdir(app_path){ `bin/rake routes -c Cart` }
+      assert_equal "Prefix Verb URI Pattern     Controller#Action\n  cart GET  /cart(.:format) cart#show\n", output
+
+      output = Dir.chdir(app_path){ `bin/rake routes -c CartController` }
       assert_equal "Prefix Verb URI Pattern     Controller#Action\n  cart GET  /cart(.:format) cart#show\n", output
     end