# CHAPTER 9. Multipage facilities

def twoUp(pdf):
    """Impose a document two up by retaining the existing page
    size, scaling pages down."""

def twoUpStack(pdf):
    """Impose a document two up by doubling the page size,
    to fit two pages on one."""

def impose(pdf, x, y, fit, columns, rtl, btt, center, margin, spacing, linewidth):
    """impose(pdf, x, y, fit, columns, rtl, btt, center, margin, spacing,
    linewidth) imposes a PDF. There are two modes: imposing x * y, or imposing
    to fit a page of size x * y. This is controlled by fit. Columns imposes by
    columns rather than rows. rtl is right-to-left, btt bottom-to-top. Center
    is unused for now. Margin is the margin around the output, spacing the
    spacing between imposed inputs."""

def padBefore(pdf, r):
    """Adds a blank page before each page in the given range."""

def padAfter(pdf, r):
    """Adds a blank page after each page in the given range."""

def padEvery(pdf, n):
    """Adds a blank page after every n pages."""

def padMultiple(pdf, n):
    """Adds pages at the end to pad the file to a multiple of n pages in
    length."""

def padMultipleBefore(pdf, n):
    """Adds pages at the beginning to pad the file to a
    multiple of n pages in length."""