Class: Gem::Compiler

Inherits:
Object
  • Object
show all
Includes:
UserInteraction
Defined in:
lib/rubygems/compiler.rb

Defined Under Namespace

Classes: CompilerError

Instance Method Summary collapse

Constructor Details

#initialize(gemfile, output_dir) ⇒ Compiler

Returns a new instance of Compiler.



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# File 'lib/rubygems/compiler.rb', line 13

def initialize(gemfile, output_dir)
  @gemfile    = gemfile
  @output_dir = output_dir
end

Instance Method Details

#compile ⇒ Object 



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# File 'lib/rubygems/compiler.rb', line 18

def compile
  installer = Gem::Installer.new(@gemfile, :unpack => true)

  # Hmm, gem already compiled?
  if installer.spec.platform != Gem::Platform::RUBY
    raise CompilerError,
          "The gem file seems to be compiled already."
  end

  # Hmm, no extensions?
  if installer.spec.extensions.empty?
    raise CompilerError,
          "There are no extensions to build on this gem file."
  end

  tmpdir     = Dir.mktmpdir
  basename   = File.basename(@gemfile, '.gem')
  target_dir = File.join(tmpdir, basename)

  # unpack gem sources into target_dir
  # We need the basename to keep the unpack happy
  say "Unpacking gem: '#{basename}' in temporary directory..." if Gem.configuration.verbose
  installer.unpack(target_dir)

  # build extensions
  installer.build_extensions

  # determine build artifacts from require_paths
  dlext    = RbConfig::CONFIG["DLEXT"]
  lib_dirs = installer.spec.require_paths.join(",")

  artifacts = Dir.glob("#{target_dir}/{#{lib_dirs}}/**/*.#{dlext}")

  # build a new gemspec from the original one
  gemspec = installer.spec.dup

  # add discovered artifacts
  artifacts.each do |path|
    # path needs to be relative to target_dir
    file = path.gsub("#{target_dir}/", "")

    say "Adding '#{file}' to gemspec" if Gem.configuration.really_verbose
    gemspec.files.push file
  end

  # clear out extensions from gemspec
  gemspec.extensions.clear

  # adjust platform
  gemspec.platform = Gem::Platform::CURRENT

  # build new gem
  output_gem = nil

  Dir.chdir target_dir do
    builder = Gem::Builder.new(gemspec)
    output_gem = builder.build
  end

  unless output_gem
    raise CompilerError,
          "There was a problem building the gem."
  end

  # move the built gem to the original output directory
  FileUtils.mv File.join(target_dir, output_gem), @output_dir

  # cleanup
  FileUtils.rm_rf tmpdir

  # return the path of the gem
  output_gem
end