Tempfile::create polyfill for Ruby < 2.1

tempfile_create.rb

require 'tempfile'

unless Tempfile.respond_to? :create
  # from https://github.com/ruby/ruby/blob/v2_3_2/lib/tempfile.rb#L326-L343
  def Tempfile.create(basename, tmpdir=nil, mode: 0, **options)
    tmpfile = nil
    Dir::Tmpname.create(basename, tmpdir, options) do |tmpname, n, opts|
      mode |= File::RDWR|File::CREAT|File::EXCL
      opts[:perm] = 0600
      tmpfile = File.open(tmpname, mode, opts)
    end
    if block_given?
      begin
        yield tmpfile
      ensure
        tmpfile.close if !tmpfile.closed?
        File.unlink tmpfile
      end
    else
      tmpfile
    end
  end
end

tempfile_description.rb

require 'tempfile'
require 'tempfile_create'

p Tempfile.new("tmp").class    #=> Tempfile
p Tempfile.open("tmp").class   #=> Tempfile
p Tempfile.create("tmp").class #=> File

Tempfile.create("tmp") do |fp|
  p fp.class #=> File
end
p Tempfile.create("tmp") { 1 } #=> 1

tmpfile = nil
Tempfile.create("tmp") do |fp|
  p fp.closed?           #=> false
  p File.exist?(fp.path) #=> true
  tmpfile = fp
end
p tmpfile.closed?          #=> true
p File.exist? tmpfile.path #=> false

Tempfile.create("tmp") do |fp|
  fp.close
end # without any errors

begin
  Tempfile.create("tmp") do |fp|
    File.unlink fp
  end
rescue Errno::ENOENT => e
  # No such file or directory @ unlink_internal
end