Combine multiple --pattern arguments

Changelog.md

@@ -1,3 +1,10 @@
+### Development
+
+Enhancements:
+
+* Combine multiple `--pattern` arguments making them equivalent to
+  `--pattern=1,2,...,n`. (Jon Rowe, #2002)
+
 ### 3.3.0 / 2015-06-12
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.2.3...v3.3.0)
 

lib/rspec/core/option_parser.rb

@@ -34,6 +34,7 @@ def parse(source=nil)
   private
 
     # rubocop:disable MethodLength
+    # rubocop:disable CyclomaticComplexity
     def parser(options)
       OptionParser.new do |parser|
         parser.banner = "Usage: rspec [options] [files or directories]\n\n"
@@ -179,7 +180,11 @@ def parser(options)
         end
 
         parser.on('-P', '--pattern PATTERN', 'Load files matching pattern (default: "spec/**/*_spec.rb").') do |o|
-          options[:pattern] = o
+          if options[:pattern]
+            options[:pattern] += ',' + o
+          else
+            options[:pattern] = o
+          end
         end
 
         parser.on('--exclude-pattern PATTERN',
@@ -250,6 +255,7 @@ def parser(options)
       end
     end
     # rubocop:enable MethodLength
+    # rubocop:enable CyclomaticComplexity
 
     def add_tag_filter(options, filter_type, tag_name, value=true)
       (options[filter_type] ||= {})[tag_name] = value

spec/rspec/core/option_parser_spec.rb

@@ -214,6 +214,11 @@ def generate_help_text
           options = Parser.parse([option, 'spec/**/*.spec'])
           expect(options[:pattern]).to eq('spec/**/*.spec')
         end
+
+        it 'combines multiple patterns' do
+          options = Parser.parse([option, 'spec/**/*.spec', option, 'tests/**/*.spec'])
+          expect(options[:pattern]).to eq('spec/**/*.spec,tests/**/*.spec')
+        end
       end
     end