Stylus Triangle Generator

triangle.styl

triangle(orientation, width, height, color)
    if orientation == top
        border-width 0 unit(width/2, px) unit(height, px) unit(width/2, px)
        border-color transparent transparent color transparent
    else if orientation == left
        border-width unit(height/2, px) unit(width, px) unit(height/2, px) 0
        border-color transparent color transparent transparent
    else if orientation == bottom
        border-width unit(height, px) unit(width/2, px) 0 unit(width/2, px)
        border-color color transparent transparent transparent
    else if orientation == right
        border-width unit(height/2, px) 0 unit(height/2, px) unit(width, px)
        border-color transparent transparent transparent color
    else
        error('triangle mixin expected an orientation of top/right/bottom/left')

    width 0
    height 0
    border-style solid