mvz/happymapper

#!/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($PROGRAM_NAME) == File.expand_path(__FILE__)
  end

  def env_var_version
    ENV.fetch("BUNDLER_VERSION", nil)
  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/o

      bundler_version = Regexp.last_match(1)
      update_index = i
    end
    bundler_version
  end

  def gemfile
    gemfile = ENV.fetch("BUNDLE_GEMFILE", nil)
    return gemfile if gemfile && !gemfile.empty?

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

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

  def lockfile_version
    return unless File.file?(lockfile)

    lockfile_contents = File.read(lockfile)
    unless lockfile_contents =~ \
           /\n\nBUNDLED WITH\n\s{2,}(#{Gem::Version::VERSION_PATTERN})\n/o
      return
    end

    Regexp.last_match(1)
  end

  def bundler_requirement
    @bundler_requirement ||=
      env_var_version ||
      cli_arg_version ||
      bundler_requirement_for(lockfile_version)
  end

  def bundler_requirement_for(version)
    return "#{Gem::Requirement.default}.a" unless version

    bundler_gem_version = Gem::Version.new(version)

    bundler_gem_version.approximate_recommendation
  end

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

    activate_bundler
  end

  def activate_bundler
    gem_error = activation_error_handling do
      gem "bundler", bundler_requirement
    end
    return if gem_error.nil?

    require_error = activation_error_handling do
      require "bundler/version"
    end
    if require_error.nil? &&
       Gem::Requirement.new(bundler_requirement)
                       .satisfied_by?(Gem::Version.new(Bundler::VERSION))
      return
    end

    warn "Activating bundler (#{bundler_requirement}) failed:\n#{gem_error.message}\n\n" \
         "To install the version of bundler this project requires," \
         " run `gem install bundler -v '#{bundler_requirement}'`"
    exit 42
  end

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

m.load_bundler!

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