2 files changed, 73 insertions, 0 deletions
diff --git a/railties/lib/rails/commands/runner/USAGE b/railties/lib/rails/commands/runner/USAGE
new file mode 100644
index 0000000000..24b60037f0
--- /dev/null
+++ b/railties/lib/rails/commands/runner/USAGE
@@ -0,0 +1,20 @@
+Examples:
+
+Run `puts Rails.env` after loading the app:
+
+  <%= executable %> 'puts Rails.env'
+
+Run the Ruby file located at `path/to/filename.rb` after loading the app:
+
+  <%= executable %> path/to/filename.rb
+
+Run the Ruby script read from stdin after loading the app:
+  <%= executable %> -
+
+<% unless Gem.win_platform? %>
+You can also use the runner command as a shebang line for your executables:
+
+  #!/usr/bin/env <%= File.expand_path(executable) %>
+
+  Product.all.each { |p| p.price *= 2 ; p.save! }
+<% end %>
diff --git a/railties/lib/rails/commands/runner/runner_command.rb b/railties/lib/rails/commands/runner/runner_command.rb
new file mode 100644
index 0000000000..cb693bcf34
--- /dev/null
+++ b/railties/lib/rails/commands/runner/runner_command.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module Rails
+  module Command
+    class RunnerCommand < Base # :nodoc:
+      class_option :environment, aliases: "-e", type: :string,
+        default: Rails::Command.environment.dup,
+        desc: "The environment for the runner to operate under (test/development/production)"
+
+      no_commands do
+        def help
+          super
+          say self.class.desc
+        end
+      end
+
+      def self.banner(*)
+        "#{super} [<'Some.ruby(code)'> | <filename.rb> | -]"
+      end
+
+      def perform(code_or_file = nil, *command_argv)
+        unless code_or_file
+          help
+          exit 1
+        end
+
+        ENV["RAILS_ENV"] = options[:environment]
+
+        require_application_and_environment!
+        Rails.application.load_runner
+
+        ARGV.replace(command_argv)
+
+        if code_or_file == "-"
+          eval($stdin.read, TOPLEVEL_BINDING, "stdin")
+        elsif File.exist?(code_or_file)
+          $0 = code_or_file
+          Kernel.load code_or_file
+        else
+          begin
+            eval(code_or_file, TOPLEVEL_BINDING, __FILE__, __LINE__)
+          rescue SyntaxError, NameError => e
+            error "Please specify a valid ruby command or the path of a script to run."
+            error "Run '#{self.class.executable} -h' for help."
+            error ""
+            error e
+            exit 1
+          end
+        end
+      end
+    end
+  end
+end