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# frozen_string_literal: true

#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require_relative "../rubygems"
require_relative "command_manager"
require_relative "deprecate"

##
# Run an instance of the gem program.
#
# Gem::GemRunner is only intended for internal use by RubyGems itself.  It
# does not form any public API and may change at any time for any reason.
#
# If you would like to duplicate functionality of `gem` commands, use the
# classes they call directly.

class Gem::GemRunner
  def initialize
    @command_manager_class = Gem::CommandManager
    @config_file_class = Gem::ConfigFile
  end

  ##
  # Run the gem command with the following arguments.

  def run(args)
    validate_encoding args
    build_args = extract_build_args args

    do_configuration args

    begin
      Gem.load_env_plugins
    rescue StandardError
      nil
    end
    Gem.load_plugins

    cmd = @command_manager_class.instance

    cmd.command_names.each do |command_name|
      config_args = Gem.configuration[command_name]
      config_args = case config_args
                    when String
                      config_args.split " "
                    else
                      Array(config_args)
      end
      Gem::Command.add_specific_extra_args command_name, config_args
    end

    cmd.run Gem.configuration.args, build_args
  end

  ##
  # Separates the build arguments (those following <code>--</code>) from the
  # other arguments in the list.

  def extract_build_args(args) # :nodoc:
    return [] unless offset = args.index("--")

    build_args = args.slice!(offset...args.length)

    build_args.shift

    build_args
  end

  private

  def validate_encoding(args)
    invalid_arg = args.find {|arg| !arg.valid_encoding? }

    if invalid_arg
      raise Gem::OptionParser::InvalidArgument.new("'#{invalid_arg.scrub}' has invalid encoding")
    end
  end

  def do_configuration(args)
    Gem.configuration = @config_file_class.new(args)
    Gem.use_paths Gem.configuration[:gemhome], Gem.configuration[:gempath]
    Gem::Command.extra_args = Gem.configuration[:gem]
  end
end