acronym support in rails 3.1

acronym.rb

# "borrowed" from https://github.com/rails/rails/tree/3-2-stable/railties/lib/rails/generators/rails/app/templates/config/initializers

module Irregularities

  attr_accessor :acronyms

  def acronym(word)
    @acronyms[word.downcase] = word
    @acronym_regex = /#{@acronyms.values.join("|")}/
  end

  def underscore(camel_cased_word)
    word = camel_cased_word.to_s.dup
    word.gsub!(/::/, '/')
    word.gsub!(/(?:([A-Za-z\d])|^)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
    word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')
    word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
    word.tr!("-", "_")
    word.downcase!
    word
  end

  def camelize(term, uppercase_first_letter = true)
    string = term.to_s
    if uppercase_first_letter
      string = string.sub(/^[a-z\d]*/) { inflections.acronyms[$&] || $&.capitalize }
    else
      string = string.sub(/^(?:#{inflections.acronym_regex}(?=\b|[A-Z_])|\w)/) { $&.downcase }
    end
    string.gsub(/(?:_|(\/))([a-z\d]*)/i) { "#{$1}#{inflections.acronyms[$2] || $2.capitalize}" }.gsub('/', '::')
  end

  def humanize(lower_case_and_underscored_word)
    result = lower_case_and_underscored_word.to_s.dup
    inflections.humans.each { |(rule, replacement)| break if result.gsub!(rule, replacement) }
    result.gsub!(/_id$/, "")
    result.gsub!(/_/, ' ')
    result.gsub(/([a-z\d]*)/i) { |match|
      "#{inflections.acronyms[match] || match.downcase}"
    }.gsub(/^\w/) { $&.upcase }
  end

  def underscore(camel_cased_word)
    word = camel_cased_word.to_s.dup
    word.gsub!(/::/, '/')
    word.gsub!(/(?:([A-Za-z\d])|^)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
    word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')
    word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
    word.tr!("-", "_")
    word.downcase!
    word
  end

end

ActiveSupport::Inflector.inflections do |inflect|
  inflect.extend(Irregularities)
end