Stylus function for defining webfonts

font-face.styl

file-url(file, path = '../fonts/)
  return path + file

font-face(family, file, weight = 'normal')
  @font-face
    font-family family
    src url(file-url(file + '.eot'))
    src url(file-url(file + '.eot?#iefix')) format('embedded-opentype'),
        url(file-url(file + '.woff2')) format('woff2'),
        url(file-url(file + '.woff')) format('woff'), 
        url(file-url(file + '.otf')) format('opentype'),
        url(file-url(file + '.ttf')) format('truetype'),
        url(file-url(file + '.svg#'+ family)) format('svg')
    font-weight weight
    font-style normal

font-face('Roboto', 'roboto/Roboto-Regular')