delete remote branches behind master

clean-up-remote-branches.rb

to_delete = []

branches = `git branch -r | grep origin`
branches.each_line do |branch|
  branch.strip!
  next if branch['master']
  puts branch
  puts cmd = "git diff --stat origin/master...#{branch}"
  if `#{cmd}`.empty?
    to_delete << branch
  end
end

p to_delete

to_delete.each do |br|
  br.gsub!("origin/", "")
  puts cmd = "git push origin :#{br}"
  system cmd
end