Clean local branches that no longer have a linked remote

git-scrublocals

#!/usr/bin/env ruby

# frozen_string_literal: true

puts 'Getting list of remote branches'
remote_branches = `git ls-remote origin |\
                   grep 'refs/heads/' |\
                   cut -c53-`.split "\n"

local_branches = `git branch |\
                  tr -d ' *'`.split "\n"

local_only = local_branches.reject do |local|
  remote_branches.include? local
end

puts 'The following branches are local_only:'
puts local_only

unless ARGV[0] == '-i'
  puts <<WARNING_MESSAGE

                            :WARNING:

   Are you sure you want to irrecoverably DESTROY all these branches?!!
   if so enter YES and press <return>

   NOTE: To destroy branches interactively use the -i option

WARNING_MESSAGE

  if STDIN.gets.chomp != 'YES'
    puts 'Aborting'
    exit 1
  end
end

local_only.each do |candidate_for_destuction|
  if ARGV[0] == '-i'
    puts candidate_for_destuction.to_s
    puts 'Confirm delete (y/N/q)'
    cfm = STDIN.gets.chomp.downcase
    exit if cfm == 'q'
    next unless cfm.chomp.downcase == 'y'
  end
  `git branch -D #{candidate_for_destuction}`
  puts "Deleted: #{candidate_for_destuction}"
end