adds --version option

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    ruboclean (0.7.0)
+    ruboclean (0.7.1)
 
 GEM
   remote: https://rubygems.org/

lib/ruboclean.rb

@@ -15,15 +15,20 @@
 
 # Ruboclean entry point
 module Ruboclean
-  def self.run_from_cli!(args)
-    runner = Runner.new(args)
-    logger = Ruboclean::Logger.new(runner.verbose? ? :verbose : :none)
+  def self.run_from_cli!(args) # rubocop:disable Metrics/MethodLength
+    if args.include?("--version")
+      print Ruboclean::VERSION
+    else
+      runner = Runner.new(args)
+      logger = Ruboclean::Logger.new(runner.verbose? ? :verbose : :none)
+
+      logger.verbose "Using input path '#{runner.input_path}' ... "
+      changed = runner.run!
+      logger.verbose post_execution_message(changed, runner.verify?)
 
-    logger.verbose "Using input path '#{runner.input_path}' ... "
-    changed = runner.run!
-    logger.verbose post_execution_message(changed, runner.verify?)
+      exit !changed if runner.verify?
+    end
 
-    exit !changed if runner.verify?
     exit 0
   end
 

lib/ruboclean/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Ruboclean
-  VERSION = "0.7.0"
+  VERSION = "0.7.1"
 end

test/ruboclean_test.rb

@@ -7,6 +7,16 @@ def test_that_it_has_a_version_number
     refute_nil ::Ruboclean::VERSION
   end
 
+  def test_run_from_cli_prints_version
+    assert_output(/^[0-9]+\.[0-9]+\.[0-9]+$/) do
+      exit_code = assert_raises(SystemExit) do
+        Ruboclean.run_from_cli!(["--version"])
+      end.status
+
+      assert_equal 0, exit_code
+    end
+  end
+
   def test_run_from_cli
     using_fixture_files("00_input.yml") do |fixture_path|
       assert_output(/^Using input path '.*' \.\.\. done.$/) do