Modifies an ODT file, replacing occurrences of [[id-label]] with sequential numbers (one sequence per id).

enumerate-refs2.rb

#!/usr/bin/env ruby
# enumerate-refs2.rb
# Author: Rodrigo Rocha <[email protected]>
# Date: 2016-10-18

# To install the dependency, run on terminal:
# gem install rubyzip
require 'zip'

class Referencer; end

def help_and_quit
  puts '  Modifies an ODT file, replacing occurrences of [[id-label]]'
  puts 'with sequential numbers (one sequence per id).'
  puts '  Example: "See Figures [[fig-home]] and [[fig-detail]] and'
  puts 'Table [[tab-data]]" becomes "See Figures 1 and 2 and Table 1"'
  puts
  puts "Usage: #{$0} file.odt"
  exit 1
end


class Referencer
  KEY_LAST_INDEX = '__last_index'

  def initialize
    @hash = {}
  end

  def hash_for_id(id)
    @hash[id] = {KEY_LAST_INDEX => 0} unless @hash[id]
    @hash[id]
  end

  def last_index_for_id(id)
    hash = hash_for_id(id)
    hash[KEY_LAST_INDEX]
  end

  def increment_last_index_for_id(id)
    hash = hash_for_id(id)
    hash[KEY_LAST_INDEX] += 1
  end

  def self.id_for_key(key)
    if key.include?('-')
      key.split('-')[0]
    else
      ''
    end
  end

  def index_for(key)
    id = Referencer.id_for_key(key)
    hash = hash_for_id(id)
    index = hash[key]

    if index.nil?
      increment_last_index_for_id(id)
      index = last_index_for_id(id)
      hash[key] = index
    end

    index
  end
end

if __FILE__ == $0
  input_path = ARGV[0]
  help_and_quit if input_path.nil?

  referencer = Referencer.new

  Zip::File.open(input_path) do |zip_file|
    entry = zip_file.glob('content.xml').first
    contents = entry.get_input_stream.read

    contents.gsub!(/\[\[(.*?)\]\]/) do |m|
      key = $1.gsub(/<.*?>/, '').strip
      referencer.index_for(key)
    end

    zip_file.get_output_stream('content.xml'){ |f| f.write(contents) }

    zip_file.commit
  end
end