Add ability for plugins to alter the config on load

lib/puma/cli.rb

@@ -204,7 +204,7 @@ module Puma
           o.banner = "puma <options> <rackup file>"
 
           o.on_tail "-h", "--help", "Show help" do
-            log o
+            $stdout.puts o
             exit 0
           end
         end

lib/puma/dsl.rb

@@ -12,7 +12,7 @@ module Puma
       options
     end
 
-    def initialize(config, options)
+    def initialize(options, config)
       @config = config
       @options = options
     end
@@ -385,7 +385,11 @@ module Puma
     # Load the named plugin for use by this configuration
     #
     def plugin(name)
-      @config.load_plugin name
+      plugin = @config.load_plugin name
+
+      if plugin.respond_to? :config
+        plugin.config self
+      end
     end
   end
 end

lib/puma/plugin.rb

@@ -26,5 +26,10 @@ module Puma
     def in_background(&blk)
       Thread.new(&blk)
     end
+
+    def workers_supported?
+      return false if Puma.jruby? || Puma.windows?
+      true
+    end
   end
 end

lib/puma/plugin_loader.rb

@@ -1,3 +1,5 @@
+require 'puma/plugin'
+
 module Puma
   class UnknownPlugin < RuntimeError; end