class Gem::Ext::Builder

# File rubygems/ext/builder.rb, line 17
def self.class_name
  name =~ /Ext::(.*)Builder/
  $1.downcase
end

# File rubygems/ext/builder.rb, line 22
def self.make(dest_path, results, make_dir = Dir.pwd, sitedir = nil, targets = ["clean", "", "install"],
  target_rbconfig: Gem.target_rbconfig)
  unless File.exist? File.join(make_dir, "Makefile")
    raise Gem::InstallError, "Makefile not found"
  end

  # try to find make program from Ruby configure arguments first
  target_rbconfig["configure_args"] =~ /with-make-prog\=(\w+)/
  make_program_name = ENV["MAKE"] || ENV["make"] || $1
  make_program_name ||= RUBY_PLATFORM.include?("mswin") ? "nmake" : "make"
  make_program = Shellwords.split(make_program_name)

  # The installation of the bundled gems is failed when DESTDIR is empty in mswin platform.
  destdir = /\bnmake/i !~ make_program_name || ENV["DESTDIR"] && ENV["DESTDIR"] != "" ? format("DESTDIR=%s", ENV["DESTDIR"]) : ""

  env = [destdir]

  if sitedir
    env << format("sitearchdir=%s", sitedir)
    env << format("sitelibdir=%s", sitedir)
  end

  targets.each do |target|
    # Pass DESTDIR via command line to override what's in MAKEFLAGS
    cmd = [
      *make_program,
      *env,
      target,
    ].reject(&:empty?)
    begin
      run(cmd, results, "make #{target}".rstrip, make_dir)
    rescue Gem::InstallError
      raise unless target == "clean" # ignore clean failure
    end
  end
end

# File rubygems/ext/builder.rb, line 135
def initialize(spec, build_args = spec.build_args, target_rbconfig = Gem.target_rbconfig)
  @spec       = spec
  @build_args = build_args
  @gem_dir    = spec.full_gem_path
  @target_rbconfig = target_rbconfig

  @ran_rake = false
end

# File rubygems/ext/builder.rb, line 59
def self.ruby
  # Gem.ruby is quoted if it contains whitespace
  cmd = Shellwords.split(Gem.ruby)

  # This load_path is only needed when running rubygems test without a proper installation.
  # Prepending it in a normal installation will cause problem with order of $LOAD_PATH.
  # Therefore only add load_path if it is not present in the default $LOAD_PATH.
  load_path = File.expand_path("../..", __dir__)
  case load_path
  when RbConfig::CONFIG["sitelibdir"], RbConfig::CONFIG["vendorlibdir"], RbConfig::CONFIG["rubylibdir"]
    cmd
  else
    cmd << "-I#{load_path}"
  end
end

# File rubygems/ext/builder.rb, line 75
def self.run(command, results, command_name = nil, dir = Dir.pwd, env = {})
  verbose = Gem.configuration.really_verbose

  begin
    rubygems_gemdeps = ENV["RUBYGEMS_GEMDEPS"]
    ENV["RUBYGEMS_GEMDEPS"] = nil
    if verbose
      puts("current directory: #{dir}")
      p(command)
    end
    results << "current directory: #{dir}"
    results << Shellwords.join(command)

    require "open3"
    # Set $SOURCE_DATE_EPOCH for the subprocess.
    build_env = { "SOURCE_DATE_EPOCH" => Gem.source_date_epoch_string }.merge(env)
    output, status = begin
                       Open3.popen2e(build_env, *command, chdir: dir) do |_stdin, stdouterr, wait_thread|
                         output = String.new
                         while line = stdouterr.gets
                           output << line
                           if verbose
                             print line
                           end
                         end
                         [output, wait_thread.value]
                       end
                     rescue StandardError => error
                       raise Gem::InstallError, "#{command_name || class_name} failed#{error.message}"
                     end
    unless verbose
      results << output
    end
  ensure
    ENV["RUBYGEMS_GEMDEPS"] = rubygems_gemdeps
  end

  unless status.success?
    results << "Building has failed. See above output for more information on the failure." if verbose
  end

  yield(status, results) if block_given?

  unless status.success?
    exit_reason =
      if status.exited?
        ", exit code #{status.exitstatus}"
      elsif status.signaled?
        ", uncaught signal #{status.termsig}"
      end

    raise Gem::InstallError, "#{command_name || class_name} failed#{exit_reason}"
  end
end

# File rubygems/ext/builder.rb, line 211
def build_extensions
  return if @spec.extensions.empty?

  if @build_args.empty?
    say "Building native extensions. This could take a while..."
  else
    say "Building native extensions with: '#{@build_args.join " "}'"
    say "This could take a while..."
  end

  dest_path = @spec.extension_dir

  require "fileutils"
  FileUtils.rm_f @spec.gem_build_complete_path

  @spec.extensions.each do |extension|
    break if @ran_rake

    build_extension extension, dest_path
  end

  FileUtils.touch @spec.gem_build_complete_path
end