brew/Library/Homebrew/api_hashable.rb

# typed: strict
# frozen_string_literal: true

# Used to substitute common paths with generic placeholders when generating JSON for the API.
module APIHashable
  sig { void }
  def generating_hash!
    return if generating_hash?

    # Apply monkeypatches for API generation
    @old_homebrew_prefix = T.let(HOMEBREW_PREFIX, T.nilable(Pathname))
    @old_homebrew_cellar = T.let(HOMEBREW_CELLAR, T.nilable(Pathname))
    @old_home = T.let(Dir.home, T.nilable(String))
    @old_git_config_global = T.let(ENV.fetch("GIT_CONFIG_GLOBAL", nil), T.nilable(String))
    Object.send(:remove_const, :HOMEBREW_PREFIX)
    Object.const_set(:HOMEBREW_PREFIX, Pathname.new(HOMEBREW_PREFIX_PLACEHOLDER))
    ENV["HOME"] = HOMEBREW_HOME_PLACEHOLDER
    ENV["GIT_CONFIG_GLOBAL"] = File.join(@old_home, ".gitconfig")

    @generating_hash = T.let(true, T.nilable(T::Boolean))
  end

  sig { void }
  def generated_hash!
    return unless generating_hash?

    # Revert monkeypatches for API generation
    Object.send(:remove_const, :HOMEBREW_PREFIX)
    Object.const_set(:HOMEBREW_PREFIX, @old_homebrew_prefix)
    ENV["HOME"] = @old_home
    ENV["GIT_CONFIG_GLOBAL"] = @old_git_config_global

    @generating_hash = false
  end

  sig { returns(T::Boolean) }
  def generating_hash?
    @generating_hash ||= false
    @generating_hash == true
  end
end