require File.expand_path('../../../spec_helper', __FILE__)

describe "File.realdirpath" do
  before :each do
    @real_dir = tmp('dir_realdirpath_real')
    @fake_dir = tmp('dir_realdirpath_fake')
    @link_dir = tmp('dir_realdirpath_link')

    mkdir_p @real_dir
    File.symlink(@real_dir, @link_dir)

    @file = File.join(@real_dir, 'file')
    @link = File.join(@link_dir, 'link')

    touch @file
    File.symlink(@file, @link)

    @fake_file_in_real_dir = File.join(@real_dir, 'fake_file_in_real_dir')
    @fake_file_in_fake_dir = File.join(@fake_dir, 'fake_file_in_fake_dir')
    @fake_link_to_real_dir = File.join(@link_dir, 'fake_link_to_real_dir')
    @fake_link_to_fake_dir = File.join(@link_dir, 'fake_link_to_fake_dir')

    File.symlink(@fake_file_in_real_dir, @fake_link_to_real_dir)
    File.symlink(@fake_file_in_fake_dir, @fake_link_to_fake_dir)

    @dir_for_relative_link = File.join(@real_dir, 'dir1')
    mkdir_p @dir_for_relative_link

    @relative_path_to_file = File.join('..', 'file')
    @relative_symlink = File.join(@dir_for_relative_link, 'link')
    File.symlink(@relative_path_to_file, @relative_symlink)
  end

  after :each do
    rm_r @file, @link, @fake_link_to_real_dir, @fake_link_to_fake_dir, @real_dir, @link_dir
  end

  it "returns '/' when passed '/'" do
    File.realdirpath('/').should == '/'
  end

  it "returns the real (absolute) pathname not containing symlinks" do
    File.realdirpath(@link).should == @file
  end

  it "uses base directory for interpreting relative pathname" do
    File.realdirpath(File.basename(@link), @link_dir).should == @file
  end

  it "uses current directory for interpreting relative pathname" do
    Dir.chdir @link_dir do
      File.realdirpath(File.basename(@link)).should == @file
    end
  end

  it "uses link directory for expanding relative links" do
    File.realdirpath(@relative_symlink).should == @file
  end

  it "raises an Errno::ELOOP if the symlink points to itself" do
    File.unlink @link
    File.symlink(@link, @link)
    lambda { File.realdirpath(@link) }.should raise_error(Errno::ELOOP)
  end

  it "returns the real (absolute) pathname if the file is absent" do
    File.realdirpath(@fake_file_in_real_dir).should == @fake_file_in_real_dir
  end

  it "raises Errno::ENOENT if the directory is absent" do
    lambda { File.realdirpath(@fake_file_in_fake_dir) }.should raise_error(Errno::ENOENT)
  end

  it "returns the real (absolute) pathname if the symlink points to an absent file" do
    File.realdirpath(@fake_link_to_real_dir).should == @fake_file_in_real_dir
  end

  it "raises Errno::ENOENT if the symlink points to an absent directory" do
    lambda { File.realdirpath(@fake_link_to_fake_dir) }.should raise_error(Errno::ENOENT)
  end
end
