Parser for parameters from terminal

parse_params.rb

require 'yaml'

# Parser for parameters from terminal
# When you run a ruby script like $ ruby my_script.rb RAILS_ENV=production DATABASE=postgresql
# Usage in you my_script.rb file:
# >> p = ParseParams.new(ARGV, 'path/to/config_file.yml')
# >> p.params
class ParseParams
  attr_accessor :params
  attr_accessor :config_path

  def initialize(params, config_path = nil)
    @params = {"RAILS_ENV" => "development"}
    @config_path = config_path || "#{File.dirname(__FILE__)}/config.yml"
    
    if params.any?
      @params = params.inject({}) do |memo, pair|
        values = pair.split("=")
        memo[values.first] = values.last unless values.nil?
        memo
      end
    end
  end

  def read_configs
    begin
      YAML.load_file(@config_path)[@params["RAILS_ENV"]]
    rescue StandardError => error
      puts "Missing config file. Usage: ParseParams.new(ARGV, 'path/to/config_file.yml')"
      puts error.message
      raise Exception.new
    end
  end
end