A simple utility for moving and renaming Ruby/Rails app and spec code with one command.

mvrb.rb

#!/usr/bin/env ruby
require 'fileutils'

class Mvrb
  CODE_EXTENSION = '.rb'

  attr_reader :old_path, :new_path

  def initialize(old_path, new_path)
    @old_path = old_path
    @new_path = new_path
  end

  def move
    move_code_files
    rename_class_in_files
  end
  
  private

  def move_code_files
    move_file(old_app_path, new_app_path)
    move_file(old_spec_path, new_spec_path)
  end

  def rename_class_in_files
    rename_class_in_file(new_app_path)
    rename_class_in_file(new_spec_path)
  end

  def rename_class_in_file(filename)
    old_contents = File.read(filename)
    new_contents = old_contents.gsub(old_classname, new_classname)
    File.open(filename, 'w') { |file| file.write new_contents }
  end

  def move_file(origin, destination)
    FileUtils.mv(origin, destination)
  end

  def old_classname
    classname_from_path(old_path)
  end

  def new_classname
    classname_from_path(new_path)
  end

  def classname_from_path(path)
    filename = File.basename(path, CODE_EXTENSION)
    titleize filename
  end

  def titleize string
    string.split("_").map(&:capitalize).join
  end

  def app_path(path)
    "app/#{path}.rb"
  end

  def spec_path(path)
    "spec/#{path}_spec.rb"
  end

  def old_app_path
    app_path @old_path
  end

  def new_app_path
    app_path @new_path
  end

  def old_spec_path
    spec_path @old_path
  end

  def new_spec_path
    spec_path @new_path
  end
end

Mvrb.new(*ARGV).move