Add command line option for selecting topten decorator.

lib/turn/command.rb

@@ -70,6 +70,9 @@ def self.main(*argv)
     # Output mode.
     attr :outmode
 
+    # Decorator mode.
+    attr :decmode
+
     # Enable full backtrace
     attr :trace
 
@@ -95,6 +98,7 @@ def initialize
       @requires  = []
       @runmode   = nil
       @outmode   = nil
+      @decmode   = nil
       @trace     = nil
       @natural   = false
       @verbose   = false
@@ -218,11 +222,18 @@ def option_parser
           @outmode = :marshal
         end
 
+        opts.separator " "
+        opts.separator "DECORATOR MODES"
+
+        opts.on('--topten', "show only top ten slowest tests") do
+          @decmode = :topten
+        end
+
         opts.separator " "
         opts.separator "COMMAND OPTIONS"
 
         opts.on('--debug', "turn debug mode on") do
-          $DEBUG   = true
+          $DEBUG = true
         end
 
         opts.on('--warn', "turn warnings on") do
@@ -258,6 +269,7 @@ def main(*argv)
         c.tests     = tests
         c.runmode   = runmode
         c.format    = outmode
+        c.mode      = decmode
         c.pattern   = pattern
         c.matchcase = matchcase
         c.trace     = trace

lib/turn/configuration.rb

@@ -36,7 +36,7 @@ class Configuration
     # Reporter type.
     attr_accessor :format
 
-    # Report modifier.
+    # Report modifier. These act as decorators on the reporter class.
     attr_accessor :mode
 
     # Run mode, which defaults to `nil`, but can also be `:solo`,