Revert "Remove deprecated `server` argument from the rails server command"

This reverts commit fa791fb8e2a718b5d0430c7ca5a454678dfc192d.

Reason: `server` argument was deprecated in Rails 6.0. Ref: #32058.

1 files changed, 21 insertions, 2 deletions

diff --git a/railties/lib/rails/commands/server/server_command.rb b/railties/lib/rails/commands/server/server_command.rb
index 20694e7e39..47c3f05bb3 100644
--- a/railties/lib/rails/commands/server/server_command.rb
+++ b/railties/lib/rails/commands/server/server_command.rb
@@ -98,6 +98,8 @@ module Rails
       DEFAULT_PORT = 3000
       DEFAULT_PID_PATH = "tmp/pids/server.pid"
 
+      argument :using, optional: true
+
       class_option :port, aliases: "-p", type: :numeric,
         desc: "Runs Rails on the specified port - defaults to 3000.", banner: :port
       class_option :binding, aliases: "-b", type: :string,
@@ -124,6 +126,7 @@ module Rails
         super
 
         @original_options = local_options - %w( --restart )
+        deprecate_positional_rack_server_and_rewrite_to_option(@original_options)
       end
 
       def perform
@@ -141,7 +144,7 @@ module Rails
             after_stop_callback = -> { say "Exiting" unless options[:daemon] }
             server.start(after_stop_callback)
           else
-            say rack_server_suggestion(options[:using])
+            say rack_server_suggestion(using)
           end
         end
       end
@@ -150,7 +153,7 @@ module Rails
         def server_options
           {
             user_supplied_options: user_supplied_options,
-            server:                options[:using],
+            server:                using,
             log_stdout:            log_to_stdout?,
             Port:                  port,
             Host:                  host,
@@ -259,6 +262,22 @@ module Rails
           FileUtils.rm_f(options[:pid]) if options[:restart]
         end
 
+        def deprecate_positional_rack_server_and_rewrite_to_option(original_options)
+          if using
+            ActiveSupport::Deprecation.warn(<<~MSG)
+              Passing the Rack server name as a regular argument is deprecated
+              and will be removed in the next Rails version. Please, use the -u
+              option instead.
+            MSG
+
+            original_options.concat [ "-u", using ]
+          else
+            # Use positional internally to get around Thor's immutable options.
+            # TODO: Replace `using` occurrences with `options[:using]` after deprecation removal.
+            @using = options[:using]
+          end
+        end
+
         def rack_server_suggestion(server)
           if server.in?(RACK_SERVERS)
             <<~MSG