delete_branches

#!/usr/bin/env ruby

require "optparse"

EXCLUDED_BRANCHES = %w(
  master
  staging
)

def run_cmd(cmd)
  if $DEBUG
    puts cmd
  else
    `#{cmd}`
  end
end

def deletion_check_for(branches)
  puts "DEBUG MODE" if $DEBUG
  puts
  puts "***************"
  puts branches
  puts "***************"
  puts
  puts "Are you sure you wish to proceed? y/n"
  response = STDIN.gets.chomp
  exit 1 unless response == "y"
end

run_cmd("git fetch")
puts "Moving to staging"
run_cmd("git checkout -q staging")

if `git status` !~ /Your branch is up-to-date/
  if `git status` =~ /and can be fast-forwarded/
    puts "Pulling staging"
    `git pull`
  else
    puts "Unable to fast-forward pull staging, aborting"
    exit 1
  end
end

# Get all local branches which are merged in
definitely_merged_branches = `git branch --merged staging | grep -v master | grep -v staging`.split(/\n/)

puts "This will delete the following branches, which have definitely been merged:"
deletion_check_for(definitely_merged_branches)
run_cmd("git branch -d #{branches.join(" ")}")
# Sometimes, we get branches locally which get rebased somewhere else and
# merged in. Our local branch no longer shows up as merged because a different
# SHA was committed. Consequently, check out all branches and look for "but
# the upstream is gone" errors, which should indicate these branches.
`git branch `

puts "DEBUG MODE" if $DEBUG
puts "This will delete the following branches, which have been merged into master already:"
puts
puts "***************"
puts branches
puts "***************"
puts
puts "Are you sure you wish to proceed? y/n"
response = STDIN.gets.chomp
exit 1 unless response == "y"

branches = ARGV - EXCLUDED_BRANCHES
branches.each do |branch|
  puts "Deleting #{branch}..."

  run_cmd "git push origin :#{branch}"
  run_cmd "git branch -d #{branch}"
  run_cmd "script/jenkins delete #{branch}"
end