sangster/codeless_code

# frozen_string_literal: true

# codeless_code filters and prints fables from http://thecodelesscode.com
# Copyright (C) 2018  Jon Sangster
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <https://www.gnu.org/licenses/>.
require 'forwardable'

module CodelessCode
  # An {Enumerable collection} of {Fable fables} in a given language, all
  # translated by the same person.
  class FableSet
    extend Forwardable
    include Enumerable

    FILE_PATTERN = '*.txt'
    LANG_SEP = '-'

    attr_reader :dir
    def_delegator :fables, :each

    def initialize(dir)
      @dir = dir
    end

    def lang
      @lang ||= name_parts.first.to_sym
    end

    def translator
      @translator ||= name_parts.last
    end

    def fables
      @fables ||= files.map { |file| Fable.new(file) }.sort_by(&:number)
    end

    def filter(filt)
      select { |fable| filt.call(fable) }
    end

    private

    def files
      dir.glob(FILE_PATTERN)
    end

    def name_parts
      dir.basename.to_s.split(LANG_SEP)
    end
  end
end