import io

def should_autonewline(line):
    return (
        "static_assert" not in line
        and "extern" not in line
        and (len(line.split()) < 2 or line.split()[1] != '=') # hacky; meh
    )

def _render(out, lines, indent_length):
    indent = " "
    level = 0
    namespace = 0
    for l in lines:
        if l and (l[0] == "}" or l[0] == ")"):
            level -= indent_length
            if level < 0:
                assert namespace >= 0
                namespace -= 1
                level = 0

        if len(l) == 0:
            out.write("\n")
        else:
            out.write(indent * level + l + "\n")

        if l and (l[-1] == "{" or l[-1] == "("):
            if l.startswith("namespace"):
                namespace += 1
            else:
                level += indent_length

        if level == 0 and l and l[-1] == ";":
            if should_autonewline(l):
                out.write("\n")
    return out

def renderer(indent_length=2):
    out = io.StringIO()
    def render(lines):
        return _render(out, lines, indent_length)
    return render, out