bring back single process starting

lib/foreman/cli.rb

@@ -10,7 +10,7 @@ class Foreman::CLI < Thor
 
   class_option :procfile, :type => :string, :aliases => "-f", :desc => "Default: Procfile"
 
-  desc "start", "Start the application"
+  desc "start [PROCESS]", "Start the application (or a specific PROCESS)"
 
   class_option :procfile, :type => :string, :aliases => "-f", :desc => "Default: Procfile"
   class_option :app_root, :type => :string, :aliases => "-d", :desc => "Default: Procfile directory"
@@ -27,8 +27,9 @@ class Foreman::CLI < Thor
     end
   end
 
-  def start
+  def start(process=nil)
     check_procfile!
+    engine.options[:concurrency] = "#{process}=1" if process
     engine.start
   end
 

lib/foreman/engine.rb

@@ -23,7 +23,7 @@ class Foreman::Engine
   def initialize(procfile, options={})
     @procfile  = Foreman::Procfile.new(procfile)
     @directory = options[:app_root] || File.expand_path(File.dirname(procfile))
-    @options = options
+    @options = options.dup
     @environment = read_environment_files(options[:env])
     @output_mutex = Mutex.new
   end