git pre-commit hook using rubocop in ruby

gistfile1.txt

#!/usr/bin/env ruby
 
require 'rubocop'
 
git_changed_rows  = `git status --porcelain`

changed_rows_array = git_changed_rows.split(/\n/)

added_or_changed_rows_array = changed_rows_array.select { |row| row =~ /A|AM|^M/ }

added_or_changed_files_array = added_or_changed_rows_array.collect { |row| row.split(' ')[1] }

#sanitize - rb only
added_or_changed_files_array.select! { |file| File.extname(file) == '.rb' }

changed_files_to_s = added_or_changed_files_array.join(' ')

system("rubocop #{changed_files_to_s}") unless changed_files_to_s.empty?

error =  $CHILD_STATUS.to_s[-1].to_i

STDIN.reopen('/dev/tty')

if error === 1
  puts "Would you like to continue press 'any key' or 'n/N' to halt? "
  if ['N','n'].include? gets.chomp
    exit 1
  end
end