A way to use a style sheet for styles in an email.

example_usage.rb

sheet = ScssFile.new("sample.scss")
sheet.styles_for_class(".orange_header")
=> "color: #FF8E00;  font-family: Arial, sans-serif;  font-size: 24px;"
sheet.styles_for_class(".box_border_left")
=> "font-family: Arial, sans-serif;  font-size: 16px;  border-left: 1px solid #dddddd;  padding: 10px;"

sample.scss

@mixin email-font {
  font-family: Arial, sans-serif; font-size: 16px;
}

.orange_header {
  color: #FF8E00;
  font-family: Arial, sans-serif;
  font-size: 24px;
}

.bottom_border {
  border-bottom:1px solid #dddddd;
}

.box_border_left {
  @include email-font;
  border-left: 1px solid #dddddd;
  padding:10px;
}

.box_border_right {
  @include email-font;
  border-right: 1px solid #dddddd;
  padding:10px;
}

.table_header_row {
  border-bottom:1px solid #dddddd;
  font-family: Arial, sans-serif;
  padding:10px;
}

.print_button {
  background-color:#666666;
  border-radius:4px;
  color:#ffffff;
  display:inline-block;
  font-family:sans-serif;
  font-size:13px;
  font-weight:bold;
  line-height:53px;
  text-align:center;
  text-decoration:none;
  width:200px;
  -webkit-text-size-adjust:none;
}

.policy_details_label {
  font-size:12px;
  line-height:20px;
  text-align:justify;
}

scss_file.rb

require 'sass'

class ScssFile
  attr_accessor :styles

  def initialize(file_name)
    @styles = Sass.compile_file(file_name).gsub("\n", "")
  end

  def styles_for_class(class_name)
    rules[class_name] || ""
  end

  def rules
    @_rules ||= styles.split("}").reduce({}) do |rules, line|
      selector, properties = line.split("{").map(&:strip)
      rules[selector] = properties
      rules
    end
  end
end