Used to create rails app file with module and classes included

create_rails_app_file.rb

#!/usr/bin/env rails runner
#
# Used to create rails app file with module and classes included
#
### How to use
# - Copy this into your bin folder.
# - Make this file executable by using `chmod +x`.

sub_directory = ARGV[0]
constant_name = ARGV[1]

# create file 
class RailsFileCreator
  attr_reader :sub_directory, :constant_name

  INDENT_SIZE = 2
  
  def initialize(sub_directory:, constant_name:)
    @sub_directory = sub_directory
    @constant_name = constant_name.underscore.camelize
    @indent = 0
  end

  def constant_parts
    constant_name.split("::")
  end

  def module_name_parts
    constant_parts[...-1]
  end

  def class_name
    constant_parts[-1]
  end

  def sub_filepath
    # transform constant to filepath (/)
    constant_name.underscore
  end

  def filepath
    Rails.root.join("app", sub_directory, sub_filepath).to_s + ".rb"
  end

  def indent_space
    " " * @indent
  end

  def increment_indent
    @indent += INDENT_SIZE
  end

  def decrement_indent
    @indent -= INDENT_SIZE
  end

  def call
    File.open(filepath, "w") do |file|
      module_name_parts.each do |module_name_part|
        file.write(indent_space)
        file.write("module #{module_name_part}")
        file.write("\n")
        increment_indent
      end

      file.write(indent_space)
      file.write("class #{class_name}")
      file.write("\n")
      file.write(indent_space)
      file.write("end")
      file.write("\n")

      while @indent.positive?
        decrement_indent
        file.write(indent_space)
        file.write("end")
        file.write("\n")
      end
    end
  end
end

RailsFileCreator.new(sub_directory:, constant_name:).call