recreate_tag

#!/usr/bin/env ruby

verbose = ARGV.delete("-v")
tag_to_recreate = ARGV.first
raise "Should specify tag to recreate: usage: #{$0} [-v] <tag>" if tag_to_recreate.nil?

require File.expand_path('./kernel_override', File.dirname(__FILE__)) unless verbose.nil?

branches = `git branch`.split("\n")
current_branch = branches.detect{|l| l =~ /^\*/}.gsub("\* ", "")
raise "Should not run this when in master" if current_branch == 'master'

tags = `git tag -l`.split("\n")
tags_for_current_branch = tags.select{|l| l =~ /^#{current_branch}/}
raise "Cannot recreate a non-existent tag: #{tag_to_recreate.inspect}" unless tags_for_current_branch.include?(tag_to_recreate)

latest_tag = tags_for_current_branch.sort{|a,b| a.split('.').collect(&:to_i) <=> b.split('.').collect(&:to_i)}.last
raise "Cannot recreate anything other than the latest tag: latest: #{latest_tag.inspect}" if latest_tag != tag_to_recreate

diff_exists = `git diff #{current_branch}..#{latest_tag}`
puts diff_exists

if !diff_exists.empty?
  system("git tag -d #{latest_tag}")
  system("git push origin :refs/tags/#{latest_tag}")
  system("git tag #{latest_tag}")
  system("git push --tags")
end