module Backup
  module Syncer
    module RSync
      class Base < Syncer::Base
        ##
        # Additional String or Array of options for the rsync cli
        attr_accessor :additional_rsync_options
        attr_accessor :archive

        def initialize(syncer_id = nil, &block)
          super
          instance_eval(&block) if block_given?

          @path ||= "~/backups"
          @archive = @archive.nil? ? true : @archive
        end

        private

        ##
        # Common base command for Local/Push/Pull
        def rsync_command
          utility(:rsync) << archive_option << mirror_option << exclude_option <<
            " #{Array(additional_rsync_options).join(" ")}".rstrip
        end

        def mirror_option
          mirror ? " --delete" : ""
        end

        def archive_option
          archive ? " --archive" : ""
        end

        def exclude_option
          excludes.map { |pattern| " --exclude='#{pattern}'" }.join
        end

        ##
        # Each path is expanded, since these refer to local paths and are
        # being shell-quoted. This will also remove any trailing `/` from
        # each path, as we don't want rsync's "trailing / on source directories"
        # behavior. This method is used by RSync::Local and RSync::Push.
        def paths_to_push
          directories.map { |dir| "'#{File.expand_path(dir)}'" }.join(" ")
        end
      end
    end
  end
end
