DannyBen/enforce

module Enforce
  class CommandLine
    class << self
      def execute(argv = [])
        return show_usage if argv.empty?

        file = find_file argv[0]
        return show_file_not_found unless file

        handler.execute file
        handler.failed? ? 1 : 0
      end

    private

      def find_file(basename)
        candidates = [
          "#{basename}.rb",
          "#{home_dir}/#{basename}.rb",
        ]

        candidates.each do |candidate|
          return candidate if File.exist? candidate
        end

        false
      end

      def handler
        @handler ||= Enforce::Handler.new
      end

      def show_usage
        puts "Enforce #{Enforce::VERSION}"
        puts '  Usage: enforce RULES_FILE (without .rb extension)'
        0
      end

      def show_file_not_found
        puts 'Error: Could not find rules file'
        1
      end

      def home_dir
        ENV['ENFORCE_HOME'] ||= "#{Dir.home}/enforce"
      end
    end
  end
end