chain_rebase.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# README
# - gem install git
# - Update the ticket prefix
# - Update the branch name
# - Put this in /usr/local/bin and chmod +x it

require 'git'

def log(msg)
  puts "#{Time.now} - #{msg}"
end

print '🤔 Proceed? (yes): '
result = gets.chomp

exit unless result == 'yes'

TICKET_PREFIX = /^\[GH-[0-9]{3,4}\]/

branches = [
  'branch-name-1',
  'branch-name-2',
  'branch-name-3',
  'branch-name-4',
]

g = Git.open('./')

log "📦 DIRECTORY: #{g.dir}"

local_branches = g.branches.local.map(&:name)

branches.each_with_index do |branch_name, index|
  next if index.zero?

  log("📦 BRANCH: #{branch_name}")

  unless local_branches.include? branch_name
    log("🚨 ERROR: Specified branch doesn't exist in local")

    break
  end

  g.branch(branch_name).checkout

  unless g.current_branch == branch_name
    log('🚨 ERROR: Checkout failed')

    break
  end

  log('✅')

  log_titles = g.log.map { |m| m.message.split("\n").first }
  commit_count = log_titles.find_index { |m| m.match TICKET_PREFIX }

  command = "git rebase --onto #{branches[index - 1]} HEAD~#{commit_count + 1}"

  log "⚡️ #{command}"

  puts nil
  system command
  puts nil

  log('🚀 Done')

  puts nil
end

puts '-----------------'
print '🚨 PUSH FORCE? (yes): '
result = gets.chomp

exit unless result == 'yes'

branches.each do |branch_name|
  command = "git push -f --quiet origin #{branch_name}:#{branch_name}"

  log "⚡️ #{command}"

  puts nil
  system command
  puts nil

  log('🚀 Done')
end

log('🚀 🚀 🚀')