Remove test warnings, add ANSI escape code remover

lib/vagrant/util/ansi_escape_code_remover.rb

@@ -0,0 +1,34 @@
+module Vagrant
+  module Util
+    module ANSIEscapeCodeRemover
+      # Removes ANSI escape code sequences from the text and returns
+      # it.
+      #
+      # This removes all the ANSI escape codes listed here along with
+      # the escape codes for VT100 terminals:
+      #
+      # http://ascii-table.com/ansi-escape-sequences.php
+      def remove_ansi_escape_codes(text)
+        # An array of regular expressions which match various kinds
+        # of escape sequences. I can't think of a better single regular
+        # expression or any faster way to do this.
+        matchers = [/\e\[\d*[ABCD]/, # Matches things like \e[4D
+                    /\e\[(\d*;)?\d*[HF]/, # Matches \e[1;2H or \e[H
+                    /\e\[(s|u|2J|K)/, # Matches \e[s, \e[2J, etc.
+                    /\e\[(\d*;){0,2}\d*m/, # Matches color escapes: \e[32m
+                    /\e\[=\d*[hl]/, # Matches \e[=24h
+                    /\e\[\?[1-9][hl]/, # Matches \e[?2h
+                    /\e\[20[hl]/, # Matches \e[20l]
+                    /\e[DME78H]/, # Matches \eD, \eH, etc.
+                    /\e\[[0-2]?[JK]/, # Matches \e[0J, \e[K, etc.
+                    ]
+        # Take each matcher and replace it with emptiness.
+        matchers.each do |matcher|
+          text.gsub!(matcher, "")
+        end
+
+        text
+      end
+    end
+  end
+end

test/unit/vagrant/config/base_test.rb

@@ -25,10 +25,11 @@ describe Vagrant::Config::Base do
 
   it "doesn't merge values that start with a double underscore" do
     bar_class = Class.new(foo_class) do
-      @@counter = 0
+      class_variable_set(:@@counter, 0)
+
       def initialize
-        @__test = @@counter
-        @@counter += 1
+        @__test = self.class.send(:class_variable_get, :@@counter)
+        self.class.send(:class_variable_set, :@@counter, @__test + 1)
       end
     end
 

test/unit/vagrant/util/ansi_escape_code_remover_test.rb

@@ -0,0 +1,17 @@
+require File.expand_path("../../../base", __FILE__)
+
+require "vagrant/util/ansi_escape_code_remover"
+
+describe Vagrant::Util::ANSIEscapeCodeRemover do
+  let(:klass) do
+    Class.new do
+      extend Vagrant::Util::ANSIEscapeCodeRemover
+    end
+  end
+
+  it "should remove ANSI escape codes" do
+    klass.remove_ansi_escape_codes("\e[Hyo").should == "yo"
+    klass.remove_ansi_escape_codes("\e[38myo").should == "yo"
+  end
+end
+