Method: Datadog::CI::Git::LocalRepository.relative_to_root

Defined in:
lib/datadog/ci/git/local_repository.rb

.relative_to_root(path) ⇒ Object

ATTENTION: this function is running in a hot path and should be optimized for performance



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# File 'lib/datadog/ci/git/local_repository.rb', line 35

def self.relative_to_root(path)
  return "" if path.nil?

  root_path = root
  return path if root_path.nil?

  if File.absolute_path?(path)
    # prefix_index is where the root path ends in the given path
    prefix_index = root_path.size

    # impossible case - absolute paths are returned from code coverage tool that always checks
    # that root is a prefix of the path
    return "" if path.size < prefix_index

    prefix_index += 1 if path[prefix_index] == File::SEPARATOR
    res = path[prefix_index..]
  else
    # prefix_to_root is a difference between the root path and the given path
    if @prefix_to_root == ""
      return path
    elsif @prefix_to_root
      return File.join(@prefix_to_root, path)
    end

    pathname = Pathname.new(File.expand_path(path))
    root_path = Pathname.new(root_path)

    # relative_path_from is an expensive function
    res = pathname.relative_path_from(root_path).to_s

    unless defined?(@prefix_to_root)
      @prefix_to_root = res&.gsub(path, "") if res.end_with?(path)
    end
  end

  res || ""
end