refactor Pry::Output and add #tty? method to it.

lib/pry/output.rb

@@ -1,14 +1,13 @@
-class Pry
+class Pry::Output
-  class Output
   attr_reader :_pry_
 
   def initialize(_pry_)
     @_pry_ = _pry_
+    @boxed_io = _pry_.config.output
   end
 
   def puts(*objs)
     return print "\n" if objs.empty?
-
     objs.each do |obj|
       if ary = Array.try_convert(obj)
         puts(*ary)
@@ -16,35 +15,36 @@ class Pry
         print "#{obj.to_s.chomp}\n"
       end
     end
-
     nil
   end
 
   def print(*objs)
     objs.each do |obj|
-        _pry_.config.output.print decolorize_maybe(obj.to_s)
+      @boxed_io.print decolorize_maybe(obj.to_s)
     end
-
     nil
   end
   alias << print
   alias write print
 
-    # If _pry_.config.color is currently false, removes ansi escapes from the string.
+  def tty?
-    def decolorize_maybe(str)
+    @boxed_io.respond_to?(:tty?) and @boxed_io.tty?
-      if _pry_.config.color
-        str
-      else
-        Helpers::Text.strip_color str
-      end
   end
 
   def method_missing(name, *args, &block)
-      _pry_.config.output.__send__(name, *args, &block)
+    @boxed_io.__send__(name, *args, &block)
   end
 
   def respond_to_missing?(*a)
     _pry_.config.respond_to?(*a)
   end
+
+  private
+  def decolorize_maybe(str)
+    if _pry_.config.color
+      str
+    else
+      Pry::Helpers::Text.strip_color str
+    end
   end
 end