diff --git a/lib/pry/commands/cat/exception_formatter.rb b/lib/pry/commands/cat/exception_formatter.rb
index ca6818da..f794c68d 100644
--- a/lib/pry/commands/cat/exception_formatter.rb
+++ b/lib/pry/commands/cat/exception_formatter.rb
@@ -1,9 +1,9 @@
 class Pry
   class Command::Cat
     class ExceptionFormatter < AbstractFormatter
-      attr_accessor :ex
-      attr_accessor :opts
-      attr_accessor :_pry_
+      attr_reader :ex
+      attr_reader :opts
+      attr_reader :_pry_
 
       def initialize(exception, _pry_, opts)
         @ex = exception
@@ -23,7 +23,7 @@ class Pry
       private
 
       def code_window_size
-        Pry.config.default_window_size || 5
+        _pry_.config.default_window_size || 5
       end
 
       def backtrace_level
diff --git a/lib/pry/commands/cat/file_formatter.rb b/lib/pry/commands/cat/file_formatter.rb
index a03655fb..92c62688 100644
--- a/lib/pry/commands/cat/file_formatter.rb
+++ b/lib/pry/commands/cat/file_formatter.rb
@@ -1,9 +1,9 @@
 class Pry
   class Command::Cat
     class FileFormatter < AbstractFormatter
-      attr_accessor :file_with_embedded_line
-      attr_accessor :opts
-      attr_accessor :_pry_
+      attr_reader :file_with_embedded_line
+      attr_reader :opts
+      attr_reader :_pry_
 
       def initialize(file_with_embedded_line, _pry_, opts)
         @file_with_embedded_line = file_with_embedded_line
@@ -36,7 +36,7 @@ class Pry
       end
 
       def code_window_size
-        Pry.config.default_window_size || 7
+        _pry_.config.default_window_size || 7
       end
 
       def decorate(content)
@@ -49,7 +49,7 @@ class Pry
 
       def detect_code_type_from_file(file_name)
         code_type = @code_from_file.code_type
-        
+
         if code_type == :unknown
           name, ext = File.basename(file_name).split('.', 2)
           case name