#Rails で bundle exec rspec って毎回入力するのが面倒だから bin/rspec をインストールするにはたった2コマンドで良いなんて `bundle binstubs rspec-core`

bin/rspec の実体はrubyスクリプトである

bundle binstubs rspec-core

bundle binstubs bundler --force

bin/rspec

#!/usr/bin/env ruby
# frozen_string_literal: true

#
# This file was generated by Bundler.
#
# The application 'rspec' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require "pathname"
ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
  Pathname.new(__FILE__).realpath)

bundle_binstub = File.expand_path("../bundle", __FILE__)

if File.file?(bundle_binstub)
  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
    load(bundle_binstub)
  else
    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
  end
end

require "rubygems"
require "bundler/setup"

load Gem.bin_path("rspec-core", "rspec")

bin/bundle

#!/usr/bin/env ruby
# frozen_string_literal: true

#
# This file was generated by Bundler.
#
# The application 'bundle' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require "rubygems"

m = Module.new do
    module_function

  def invoked_as_script?
    File.expand_path($0) == File.expand_path(__FILE__)
  end

  def env_var_version
    ENV["BUNDLER_VERSION"]
  end

  def cli_arg_version
    return unless invoked_as_script? # don't want to hijack other binstubs
    return unless "update".start_with?(ARGV.first || " ") # must be running `bundle update`
    bundler_version = nil
    update_index = nil
    ARGV.each_with_index do |a, i|
      if update_index && update_index.succ == i && a =~ Gem::Version::ANCHORED_VERSION_PATTERN
        bundler_version = a
      end
      next unless a =~ /\A--bundler(?:[= ](#{Gem::Version::VERSION_PATTERN}))?\z/
      bundler_version = $1 || ">= 0.a"
      update_index = i
    end
    bundler_version
  end

  def gemfile
    gemfile = ENV["BUNDLE_GEMFILE"]
    return gemfile if gemfile && !gemfile.empty?

    File.expand_path("../../Gemfile", __FILE__)
  end

  def lockfile
    lockfile =
      case File.basename(gemfile)
      when "gems.rb" then gemfile.sub(/\.rb$/, gemfile)
      else "#{gemfile}.lock"
      end
    File.expand_path(lockfile)
  end

  def lockfile_version
    return unless File.file?(lockfile)
    lockfile_contents = File.read(lockfile)
    return unless lockfile_contents =~ /\n\nBUNDLED WITH\n\s{2,}(#{Gem::Version::VERSION_PATTERN})\n/
    Regexp.last_match(1)
  end

  def bundler_version
    @bundler_version ||= begin
      env_var_version || cli_arg_version ||
        lockfile_version || "#{Gem::Requirement.default}.a"
    end
  end

  def load_bundler!
    ENV["BUNDLE_GEMFILE"] ||= gemfile

    # must dup string for RG < 1.8 compatibility
    activate_bundler(bundler_version.dup)
  end

  def activate_bundler(bundler_version)
    if Gem::Version.correct?(bundler_version) && Gem::Version.new(bundler_version).release < Gem::Version.new("2.0")
      bundler_version = "< 2"
    end
    gem_error = activation_error_handling do
      gem "bundler", bundler_version
    end
    return if gem_error.nil?
    require_error = activation_error_handling do
      require "bundler/version"
    end
    return if require_error.nil? && Gem::Requirement.new(bundler_version).satisfied_by?(Gem::Version.new(Bundler::VERSION))
    warn "Activating bundler (#{bundler_version}) failed:\n#{gem_error.message}\n\nTo install the version of bundler this project requires, run `gem install bundler -v '#{bundler_version}'`"
    exit 42
  end

  def activation_error_handling
    yield
    nil
  rescue StandardError, LoadError => e
    e
  end
end

m.load_bundler!

if m.invoked_as_script?
  load Gem.bin_path("bundler", "bundle")
end

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