Add process name 'tag' functionality. Easier to distinguish thin daem…

…ons from eachother in process listing

lib/thin/runner.rb

@@ -87,6 +87,7 @@ def parser
                                       "(default: #{@options[:pid]})")                   { |file| @options[:pid] = file }
           opts.on("-u", "--user NAME", "User to run daemon as (use with -g)")           { |user| @options[:user] = user }
           opts.on("-g", "--group NAME", "Group to run daemon as (use with -u)")         { |group| @options[:group] = group }
+          opts.on(      "--tag NAME", "Additional text to display in process listing")  { |tag| @options[:tag] = tag }
 
           opts.separator ""
           opts.separator "Cluster options:"                                             

lib/thin/server.rb

@@ -59,7 +59,10 @@ class Server
 
     # Application (Rack adapter) called with the request that produces the response.
     attr_accessor :app
-
+
+    # A tag that will show in the process listing
+    attr_accessor :tag
+
     # Backend handling the connections to the clients.
     attr_accessor :backend
 
@@ -103,6 +106,9 @@ def initialize(*args, &block)
         end
       end
 
+      # Set tag if needed
+      self.tag = options[:tag]
+
       # Try to intelligently select which backend to use.
       @backend = select_backend(host, port, options)
 
@@ -188,7 +194,8 @@ def config
     # Name of the server and type of backend used.
     # This is also the name of the process in which Thin is running as a daemon.
     def name
-      "thin server (#{@backend})"
+      buffer = "thin server (#{@backend})"
+      	buffer << " [#{tag}]" unless tag.nil? || tag.empty?
     end
     alias :to_s :name