helpers/documentation: don't colorize twice

Fixes #2181 (Bad formatting)

One of the regexps matches against string that were already colored. To prevent
that I used a negative look-ahead and rejected color sequences.

1 files changed, 4 insertions, 0 deletions

diff --git a/spec/documentation_helper_spec.rb b/spec/documentation_helper_spec.rb
index 8da62a29..715e101d 100644
--- a/spec/documentation_helper_spec.rb
+++ b/spec/documentation_helper_spec.rb
@@ -72,5 +72,9 @@ describe Pry::Helpers::DocumentationHelpers do
     it "should not remove ++" do
       expect(@helper.process_rdoc("--\n  comment in a bubble\n++")).to match(/\+\+/)
     end
+
+    it "should not syntax highlight already highlighted code" do
+      expect(@helper.process_rdoc("  \e\[31mFOO\e\[0m")).to match(/  \e\[31mFOO\e\[0m/)
+    end
   end
 end