Draw line of a route name to the end of row console on `rails routes --expanded`

In order to get width of console use `IO::console_size`,
See https://ruby-doc.org/stdlib-2.4.1/libdoc/io/console/rdoc/IO.html#method-c-console_size

Related to #32130

2 files changed, 20 insertions, 6 deletions

diff --git a/actionpack/lib/action_dispatch/routing/inspector.rb b/actionpack/lib/action_dispatch/routing/inspector.rb
index de200fada0..19dfb44283 100644
--- a/actionpack/lib/action_dispatch/routing/inspector.rb
+++ b/actionpack/lib/action_dispatch/routing/inspector.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "delegate"
+require "io/console/size"
 
 module ActionDispatch
   module Routing
@@ -225,7 +226,7 @@ module ActionDispatch
           def draw_expanded_section(routes)
             routes.map.each_with_index do |r, i|
               <<~MESSAGE
-              --[ Route #{i + 1} ]#{'-' * 60}
+              #{route_header(index: i + 1)}
               Prefix            | #{r[:name]}
               Verb              | #{r[:verb]}
               URI               | #{r[:path]}
@@ -233,6 +234,14 @@ module ActionDispatch
               MESSAGE
             end
           end
+
+          def route_header(index:)
+            console_width = IO.console_size.second
+            header_prefix = "--[ Route #{index} ]"
+            dash_remainder = [console_width - header_prefix.size, 0].max
+
+            "#{header_prefix}#{'-' * dash_remainder}"
+          end
       end
     end
 
diff --git a/actionpack/test/dispatch/routing/inspector_test.rb b/actionpack/test/dispatch/routing/inspector_test.rb
index 127212b228..43407724aa 100644
--- a/actionpack/test/dispatch/routing/inspector_test.rb
+++ b/actionpack/test/dispatch/routing/inspector_test.rb
@@ -3,6 +3,7 @@
 require "abstract_unit"
 require "rails/engine"
 require "action_dispatch/routing/inspector"
+require "io/console/size"
 
 class MountedRackApp
   def self.call(env)
@@ -322,6 +323,9 @@ module ActionDispatch
       end
 
       def test_routes_when_expanded
+        previous_console_winsize = IO.console.winsize
+        IO.console.winsize = [0, 23]
+
         engine = Class.new(Rails::Engine) do
           def self.inspect
             "Blog::Engine"
@@ -337,31 +341,32 @@ module ActionDispatch
           mount engine => "/blog", :as => "blog"
         end
 
-        assert_equal ["--[ Route 1 ]------------------------------------------------------------",
+        assert_equal ["--[ Route 1 ]----------",
                       "Prefix            | custom_assets",
                       "Verb              | GET",
                       "URI               | /custom/assets(.:format)",
                       "Controller#Action | custom_assets#show",
-                      "--[ Route 2 ]------------------------------------------------------------",
+                      "--[ Route 2 ]----------",
                       "Prefix            | custom_furnitures",
                       "Verb              | GET",
                       "URI               | /custom/furnitures(.:format)",
                       "Controller#Action | custom_furnitures#show",
-                      "--[ Route 3 ]------------------------------------------------------------",
+                      "--[ Route 3 ]----------",
                       "Prefix            | blog",
                       "Verb              | ",
                       "URI               | /blog",
                       "Controller#Action | Blog::Engine",
                       "",
                       "[ Routes for Blog::Engine ]",
-                      "--[ Route 1 ]------------------------------------------------------------",
+                      "--[ Route 1 ]----------",
                       "Prefix            | cart",
                       "Verb              | GET",
                       "URI               | /cart(.:format)",
                       "Controller#Action | cart#show"], output
+      ensure
+        IO.console.winsize = previous_console_winsize
       end
 
-
       def test_no_routes_matched_filter_when_expanded
         output = draw("rails/dummy", ActionDispatch::Routing::ConsoleFormatter::Expanded.new) do
           get "photos/:id" => "photos#show", :id => /[A-Z]\d{5}/