thiago

thiago.rb

dirs = [
  'a1',
  'a2',
  'a3',
  'a4',
  'b1',
  'b2',
  'b3',
  # c missing
  'd1',
  'd2',
  'd3',
  'd4',
  'd5',
  'd6',
  'd7',
  # e missing
  'f1',
  'f2',
  'f3',
  'f4',
  'f5'
]

index_table = {
  '1.1' => 'a1',
  '1.2' => 'a2',
  '1.3' => 'a3',
  '1.4' => 'a4',
  '2.1' => 'b1',
  '2.2' => 'b2',
  '2.3' => 'b3',
  '3.1' => 'c1',
  '3.2' => 'c2',
  '3.3' => 'c3',
  '3.4' => 'c4',
  '3.5' => 'c5',
  '4.1' => 'd1',
  '4.2' => 'd2',
  '4.3' => 'd3',
  '4.4' => 'd4',
  '4.5' => 'd5',
  '4.6' => 'd6',
  '4.7' => 'd7',
  '5.1' => 'e1',
  '5.2' => 'e2',
  '5.3' => 'e3',
  '6.1' => 'f1',
  '6.2' => 'f2',
  '6.3' => 'f3',
  '6.4' => 'f4',
  '6.5' => 'f5'
}

new_index_table = {}

last_index = 1
prev_index = nil
skipping_index = nil

index_table.each do |full_index, dir|
  index, sub_index = full_index.split('.').map(&:to_i)

  next if skipping_index == index

  if sub_index == 1 && !dirs.include?(dir)
    skipping_index = index
    next
  end

  if prev_index && index != prev_index
    last_index += 1
  end

  new_full_index = "#{last_index}.#{sub_index}"
  new_index_table[new_full_index] = dir

  prev_index = index
end

puts "Dirs:"
pp dirs

puts "\nOriginal index table:"
pp index_table

puts "\nNew index table:"
pp new_index_table