Some useful mixins for stylus

mixins.styl

//
// Mixins
// --------------------------------------------------

// Font face
font-url(file)
    return url(file)

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

// Font
font-size(size)
    if unit(size) is 'px'
        font-size size
        font-size (remove-unit(size) / 10)rem
    else if unit(size) is 'pt'
        font-size (remove-unit(size) * 4 / 3)px
        font-size (remove-unit(size) * 4 / 30)rem
    else
        font-size size

line-height(height)
    if unit(height) is 'px'
        line-height height
        line-height (remove-unit(height) / 10)rem
    else if unit(height) is 'pt'
        line-height (remove-unit(height) * 4 / 3)px
        line-height (remove-unit(height) * 4 / 30)rem
    else
        line-height height