ブランチを比較して、差分に対して、rspecを実行

#!/usr/bin/env ruby
require 'open3'

base_branch = ARGV[0] || 'master'
target_branch = ARGV[1] || 'HEAD'

stdout, stdin, status = Open3.capture3("git diff #{base_branch}..#{target_branch} --name-only")

raise "Failure. #{stdin}" unless status
spec_files = []
stdout.split(/\n/).each do |file_name|
  next unless file_name =~ /\.rb\Z/
  spec_files << if file_name.match?(/\_spec\.rb\Z/)
                  file_name
                elsif file_name.match?(/routes.rb/)
                  file_name.gsub('routes.rb', 'routing_spec.rb')
                else
                  file_name.gsub('app/', 'spec/').gsub('.rb', '_spec.rb')
                end
end

puts '********** Checking diff **********'
puts "Checking between #{base_branch}..#{target_branch}"
puts ''
puts 'Files:'
spec_files.each do |file|
  puts file.to_s
end

target_files = spec_files.uniq.select {|f| File.exist?(f) }
notfound_files = spec_files.uniq - target_files

unless notfound_files.empty?
  puts '********** Not Found **********'
  puts notfound_files.join("\n")
  puts "\n"
end

if target_files.empty?
  puts 'Test target have not been found.'
else
  puts '********** Test Target **********'
  puts target_files.join("\n")
  puts '********** Executing Test **********'
  puts "bundle exec rspec #{target_files.join(' ')}"
  system "bundle exec rspec #{target_files.join(' ')}"
end