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ðŸ“ ..
ðŸ“„ build_command.rb(3.1 KB)
ðŸ“„ cert_command.rb(9.15 KB)
ðŸ“„ check_command.rb(2.24 KB)
ðŸ“„ cleanup_command.rb(4.59 KB)
ðŸ“„ contents_command.rb(4.06 KB)
ðŸ“„ dependency_command.rb(5.13 KB)
ðŸ“„ environment_command.rb(5.29 KB)
ðŸ“„ exec_command.rb(6.8 KB)
ðŸ“„ fetch_command.rb(2.51 KB)
ðŸ“„ generate_index_command.rb(2.91 KB)
ðŸ“„ help_command.rb(10.16 KB)
ðŸ“„ info_command.rb(852 B)
ðŸ“„ install_command.rb(7.67 KB)
ðŸ“„ list_command.rb(1012 B)
ðŸ“„ lock_command.rb(2.69 KB)
ðŸ“„ mirror_command.rb(627 B)
ðŸ“„ open_command.rb(1.92 KB)
ðŸ“„ outdated_command.rb(864 B)
ðŸ“„ owner_command.rb(3.4 KB)
ðŸ“„ pristine_command.rb(6.19 KB)
ðŸ“„ push_command.rb(2.56 KB)
ðŸ“„ query_command.rb(1.23 KB)
ðŸ“„ rdoc_command.rb(2.48 KB)
ðŸ“„ search_command.rb(977 B)
ðŸ“„ server_command.rb(649 B)
ðŸ“„ setup_command.rb(18.02 KB)
ðŸ“„ signin_command.rb(896 B)
ðŸ“„ signout_command.rb(898 B)
ðŸ“„ sources_command.rb(5.75 KB)
ðŸ“„ specification_command.rb(3.4 KB)
ðŸ“„ stale_command.rb(965 B)
ðŸ“„ uninstall_command.rb(5.8 KB)
ðŸ“„ unpack_command.rb(4.45 KB)
ðŸ“„ update_command.rb(8.87 KB)
ðŸ“„ which_command.rb(2.09 KB)
ðŸ“„ yank_command.rb(2.34 KB)

Editing: fetch_command.rb

# frozen_string_literal: true

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

class Gem::Commands::FetchCommand < Gem::Command
  include Gem::LocalRemoteOptions
  include Gem::VersionOption

def initialize
    defaults = {
      :suggest_alternate => true,
      :version => Gem::Requirement.default,
    }

super "fetch", "Download a gem and place it in the current directory", defaults

add_bulk_threshold_option
    add_proxy_option
    add_source_option
    add_clear_sources_option

add_version_option
    add_platform_option
    add_prerelease_option

add_option "--[no-]suggestions", "Suggest alternates when gems are not found" do |value, options|
      options[:suggest_alternate] = value
    end
  end

def arguments # :nodoc:
    "GEMNAME       name of gem to download"
  end

def defaults_str # :nodoc:
    "--version '#{Gem::Requirement.default}'"
  end

def description # :nodoc:
    <<-EOF
The fetch command fetches gem files that can be stored for later use or
unpacked to examine their contents.

See the build command help for an example of unpacking a gem, modifying it,
then repackaging it.
    EOF
  end

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

def check_version # :nodoc:
    if options[:version] != Gem::Requirement.default &&
       get_all_gem_names.size > 1
      alert_error "Can't use --version with multiple gems. You can specify multiple gems with" \
                  " version requirements using `gem fetch 'my_gem:1.0.0' 'my_other_gem:~>2.0.0'`"
      terminate_interaction 1
    end
  end

def execute
    check_version
    version = options[:version]

platform  = Gem.platforms.last
    gem_names = get_all_gem_names_and_versions

gem_names.each do |gem_name, gem_version|
      gem_version ||= version
      dep = Gem::Dependency.new gem_name, gem_version
      dep.prerelease = options[:prerelease]
      suppress_suggestions = !options[:suggest_alternate]

specs_and_sources, errors =
        Gem::SpecFetcher.fetcher.spec_for_dependency dep

if platform
        filtered = specs_and_sources.select {|s,| s.platform == platform }
        specs_and_sources = filtered unless filtered.empty?
      end

spec, source = specs_and_sources.max_by {|s,| s }

if spec.nil?
        show_lookup_failure gem_name, gem_version, errors, suppress_suggestions, options[:domain]
        next
      end
      source.download spec
      say "Downloaded #{spec.full_name}"
    end
  end
end

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Editing: fetch_command.rb

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