brew/Library/Homebrew/utils/svn.rb

# typed: true
# frozen_string_literal: true

require "system_command"

module Utils
  # Helper functions for querying SVN information.
  #
  # @api private
  module Svn
    class << self
      extend T::Sig

      include SystemCommand::Mixin

      sig { returns(T::Boolean) }
      def available?
        version.present?
      end

      sig { returns(T.nilable(String)) }
      def version
        return @version if defined?(@version)

        stdout, _, status = system_command(HOMEBREW_SHIMS_PATH/"scm/svn", args: ["--version"], print_stderr: false)
        @version = status.success? ? stdout.chomp[/svn, version (\d+(?:\.\d+)*)/, 1] : nil
      end

      sig { params(url: String).returns(T::Boolean) }
      def remote_exists?(url)
        return true unless available?

        # OK to unconditionally trust here because we're just checking if a URL exists.
        system_command("svn", args: ["ls", url, "--depth", "empty",
                                     "--non-interactive", "--trust-server-cert"], print_stderr: false).success?
      end

      def clear_version_cache
        remove_instance_variable(:@version) if defined?(@version)
      end
    end
  end
end