class Sass::Tree::Visitors::ToCss

def format_custom_property_value(node)
  value = node.resolved_value.sub(/\n[ \t\r\f\n]*\Z/, ' ')
  if node.style == :compact || node.style == :compressed || !value.include?("\n")
    # Folding not involving newlines was done in the parser. We can safely
    # fold newlines here because tokens like strings can't contain literal
    # newlines, so we know any adjacent whitespace is tokenized as whitespace.
    return node.resolved_value.gsub(/[ \t\r\f]*\n[ \t\r\f\n]*/, ' ')
  end
  # Find the smallest amount of indentation in the custom property and use
  # that as the base indentation level.
  lines = value.split("\n")
  indented_lines = lines[1..-1]
  min_indentation = indented_lines.
    map {|line| line[/^[ \t]*/]}.
    reject {|line| line.empty?}.
    min_by {|line| line.length}
  # Limit the base indentation to the same indentation level as the node name
  # so that if *every* line is indented relative to the property name that's
  # preserved.
  if node.name_source_range
    base_indentation = min_indentation[0...node.name_source_range.start_pos.offset - 1]
  end
  lines.first + "\n" + indented_lines.join("\n").gsub(/^#{base_indentation}/, '  ' * @tabs)
end