晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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# frozen_string_literal: true

require_relative "../command"
require_relative "../version_option"

class Gem::Commands::ContentsCommand < Gem::Command
  include Gem::VersionOption

  def initialize
    super "contents", "Display the contents of the installed gems",
          specdirs: [], lib_only: false, prefix: true,
          show_install_dir: false

    add_version_option

    add_option("--all",
               "Contents for all gems") do |all, options|
      options[:all] = all
    end

    add_option("-s", "--spec-dir a,b,c", Array,
               "Search for gems under specific paths") do |spec_dirs, options|
      options[:specdirs] = spec_dirs
    end

    add_option("-l", "--[no-]lib-only",
               "Only return files in the Gem's lib_dirs") do |lib_only, options|
      options[:lib_only] = lib_only
    end

    add_option("--[no-]prefix",
               "Don't include installed path prefix") do |prefix, options|
      options[:prefix] = prefix
    end

    add_option("--[no-]show-install-dir",
               "Show only the gem install dir") do |show, options|
      options[:show_install_dir] = show
    end

    @path_kind = nil
    @spec_dirs = nil
    @version   = nil
  end

  def arguments # :nodoc:
    "GEMNAME       name of gem to list contents for"
  end

  def defaults_str # :nodoc:
    "--no-lib-only --prefix"
  end

  def description # :nodoc:
    <<-EOF
The contents command lists the files in an installed gem.  The listing can
be given as full file names, file names without the installed directory
prefix or only the files that are requireable.
    EOF
  end

  def usage # :nodoc:
    "#{program_name} GEMNAME [GEMNAME ...]"
  end

  def execute
    @version   = options[:version] || Gem::Requirement.default
    @spec_dirs = specification_directories
    @path_kind = path_description @spec_dirs

    names = gem_names

    names.each do |name|
      found =
        if options[:show_install_dir]
          gem_install_dir name
        else
          gem_contents name
        end

      terminate_interaction 1 unless found || names.length > 1
    end
  end

  def files_in(spec)
    if spec.default_gem?
      files_in_default_gem spec
    else
      files_in_gem spec
    end
  end

  def files_in_gem(spec)
    gem_path  = spec.full_gem_path
    extra     = "/{#{spec.require_paths.join ","}}" if options[:lib_only]
    glob      = "#{gem_path}#{extra}/**/*"
    prefix_re = %r{#{Regexp.escape(gem_path)}/}

    Dir[glob].map do |file|
      [gem_path, file.sub(prefix_re, "")]
    end
  end

  def files_in_default_gem(spec)
    spec.files.map do |file|
      if file.start_with?("#{spec.bindir}/")
        [RbConfig::CONFIG["bindir"], file.delete_prefix("#{spec.bindir}/")]
      else
        gem spec.name, spec.version

        require_path = spec.require_paths.find do |path|
          file.start_with?("#{path}/")
        end

        requirable_part = file.delete_prefix("#{require_path}/")

        resolve = $LOAD_PATH.resolve_feature_path(requirable_part)&.last
        next unless resolve

        [resolve.delete_suffix(requirable_part), requirable_part]
      end
    end.compact
  end

  def gem_contents(name)
    spec = spec_for name

    return false unless spec

    files = files_in spec

    show_files files

    true
  end

  def gem_install_dir(name)
    spec = spec_for name

    return false unless spec

    say spec.gem_dir

    true
  end

  def gem_names # :nodoc:
    if options[:all]
      Gem::Specification.map(&:name)
    else
      get_all_gem_names
    end
  end

  def path_description(spec_dirs) # :nodoc:
    if spec_dirs.empty?
      "default gem paths"
    else
      "specified path"
    end
  end

  def show_files(files)
    files.sort.each do |prefix, basename|
      absolute_path = File.join(prefix, basename)
      next if File.directory? absolute_path

      if options[:prefix]
        say absolute_path
      else
        say basename
      end
    end
  end

  def spec_for(name)
    spec = Gem::Specification.find_all_by_name(name, @version).first

    return spec if spec

    say "Unable to find gem '#{name}' in #{@path_kind}"

    if Gem.configuration.verbose
      say "\nDirectories searched:"
      @spec_dirs.sort.each {|dir| say dir }
    end

    nil
  end

  def specification_directories # :nodoc:
    options[:specdirs].map do |i|
      [i, File.join(i, "specifications")]
    end.flatten
  end
end