Format a function call for display.

def reprcall(name, args=(), kwargs=(), keywords='', sep=', ',
        argfilter=repr):
    """Format a function call for display."""
    if keywords:
        keywords = ((', ' if (args or kwargs) else '') +
                    '**' + keywords)
    argfilter = argfilter or repr
    return "{name}({args}{sep}{kwargs}{keywords})".format(
            name=name, args=reprargs(args, filter=argfilter),
            sep=(args and kwargs) and sep or "",
            kwargs=reprkwargs(kwargs, sep), keywords=keywords or '')