// Additionnal "utility" breakpoints aliases
// ex. @include respond-to("medium-up") {...}
breakpoint($bp)
  if $bp == 'tiny'
    return '(max-width: %s)' % $tiny
  else if $bp == 'small'
    return '(max-width: %s)' % $small
  else if $bp == 'medium'
    return '(max-width: %s)' % $medium
  else if $bp == 'large'
    return '(max-width: %s)' % $large
  else if $bp == 'extra-large'
    return '(max-width: %s)' % $extra-large
  else if $bp == 'tiny-up'
    return '(min-width: %s + 1)' % $tiny
  else if $bp == 'small-up'
    return '(min-width: %s + 1)' % $small
  else if $bp == 'medium-up'
    return '(min-width: %s + 1)' % $medium
  else if $bp == 'large-up'
    return '(min-width: %s + 1)' % $large
  else if $bp == 'extra-large-up'
    return '(min-width: %s + 1)' % $extra-large
  else if $bp == 'retina'
    return '(-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi), (min-resolution: 2dppx)'

/*
respond-to(value)
  string = breakpoint(value)
  @media screen and string
    {block}
*/