something

pre-commit

@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+
+require 'english'
+require 'rubocop'
+
+ADDED_OR_MODIFIED = /A|AM|^M/.freeze
+
+changed_files = `git status --porcelain`.split(/\n/).
+    select { |file_name_with_status|
+      file_name_with_status =~ ADDED_OR_MODIFIED
+    }.
+    map { |file_name_with_status|
+      file_name_with_status.split(' ')[1]
+    }.
+    select { |file_name|
+      File.extname(file_name) == '.rb'
+    }.join(' ')
+
+system("rubocop #{changed_files} -a") unless changed_files.empty?
+
+exit $CHILD_STATUS.to_s[-1].to_i