[ruby/irb] Add rubocop with a few basic styling rules

(https://github.com/ruby/irb/pull/849)

* Use rubocop to enforce a few styling rules

* Add a CI job for linting

https://github.com/ruby/irb/commit/4f60cd88bb

4 files changed, 3 insertions, 4 deletions

diff --git a/lib/irb/inspector.rb b/lib/irb/inspector.rb
index ee3b19efdc..7bdd855b9a 100644
--- a/lib/irb/inspector.rb
+++ b/lib/irb/inspector.rb
@@ -46,7 +46,7 @@ module IRB # :nodoc:
     # Determines the inspector to use where +inspector+ is one of the keys passed
     # during inspector definition.
     def self.keys_with_inspector(inspector)
-      INSPECTORS.select{|k,v| v == inspector}.collect{|k, v| k}
+      INSPECTORS.select{|k, v| v == inspector}.collect{|k, v| k}
     end
 
     # Example
diff --git a/lib/irb/locale.rb b/lib/irb/locale.rb
index f94aa0f40b..1510af2ab4 100644
--- a/lib/irb/locale.rb
+++ b/lib/irb/locale.rb
@@ -94,7 +94,7 @@ module IRB # :nodoc:
       end
     end
 
-    def find(file , paths = $:)
+    def find(file, paths = $:)
       dir = File.dirname(file)
       dir = "" if dir == "."
       base = File.basename(file)
diff --git a/test/irb/test_input_method.rb b/test/irb/test_input_method.rb
index 0b52d4cbc3..7644d3176a 100644
--- a/test/irb/test_input_method.rb
+++ b/test/irb/test_input_method.rb
@@ -170,4 +170,3 @@ module TestIRB
     end
   end
 end
-
diff --git a/test/irb/test_workspace.rb b/test/irb/test_workspace.rb
index ff17b1a22c..8c7310578a 100644
--- a/test/irb/test_workspace.rb
+++ b/test/irb/test_workspace.rb
@@ -91,7 +91,7 @@ module TestIRB
         irb_path = "#{top_srcdir}/#{dir}/irb"
         File.exist?(irb_path)
       end or omit 'irb command not found'
-      assert_in_out_err(bundle_exec + ['-W0', "-C#{top_srcdir}", '-e', <<~RUBY , '--', '-f', '--'], 'binding.local_variables', /\[:_\]/, [], bug17623)
+      assert_in_out_err(bundle_exec + ['-W0', "-C#{top_srcdir}", '-e', <<~RUBY, '--', '-f', '--'], 'binding.local_variables', /\[:_\]/, [], bug17623)
         version = 'xyz' # typical rubygems loading file
         load('#{irb_path}')
       RUBY