Class: Bundler::CLI::Init

# File 'lib/bundler/cli/init.rb', line 10

def run
  if File.exist?(gemfile)
    Bundler.ui.error "#{gemfile} already exists at #{File.expand_path(gemfile)}"
    exit 1
  end

  unless File.writable?(Dir.pwd)
    Bundler.ui.error "Can not create #{gemfile} as the current directory is not writable."
    exit 1
  end

  if options[:gemspec]
    gemspec = File.expand_path(options[:gemspec])
    unless File.exist?(gemspec)
      Bundler.ui.error "Gem specification #{gemspec} doesn't exist"
      exit 1
    end

    spec = Bundler.load_gemspec_uncached(gemspec)

    File.open(gemfile, "wb") do |file|
      file << "# Generated from #{gemspec}\n"
      file << spec.to_gemfile
    end
  else
    File.open(File.expand_path("../templates/#{gemfile}", __dir__), "r") do |template|
      File.open(gemfile, "wb") do |destination|
        IO.copy_stream(template, destination)
      end
    end
  end

  puts "Writing new #{gemfile} to #{SharedHelpers.pwd}/#{gemfile}"
end