end_of_line.rb in rubocop-0.48.0

- old
+ new
@@ -3,26 +3,48 @@
 module RuboCop
   module Cop
     module Style
       # This cop checks for Windows-style line endings in the source code.
       class EndOfLine < Cop
-        MSG = 'Carriage return character detected.'.freeze
+        include ConfigurableEnforcedStyle
 
+        MSG_DETECTED = 'Carriage return character detected.'.freeze
+        MSG_MISSING = 'Carriage return character missing.'.freeze
+
         def investigate(processed_source)
           last_token = processed_source.tokens.last
           last_line =
             last_token ? last_token.pos.line : processed_source.lines.length
 
           processed_source.raw_source.each_line.with_index do |line, index|
             break if index >= last_line
-            next unless line =~ /\r$/
+            msg = offense_message(line)
+            next unless msg
+            next if unimportant_missing_cr?(index, last_line, line)
 
             range =
               source_range(processed_source.buffer, index + 1, 0, line.length)
-            add_offense(nil, range, MSG)
+            add_offense(nil, range, msg)
             # Usually there will be carriage return characters on all or none
             # of the lines in a file, so we report only one offense.
             break
+          end
+        end
+
+        # If there is no LF on the last line, we don't care if there's no CR.
+        def unimportant_missing_cr?(index, last_line, line)
+          style == :crlf && index == last_line - 1 && line !~ /\n$/
+        end
+
+        def offense_message(line)
+          effective_style = if style == :native
+                              Platform.windows? ? :crlf : :lf
+                            else
+                              style
+                            end
+          case effective_style
+          when :lf then MSG_DETECTED if line =~ /\r$/
+          else MSG_MISSING if line !~ /\r$/
           end
         end
       end
     end
   end