render_table aligned plain-text output

"""Render rows as an aligned plain-text table for terminal output."""
from typing import Any, Iterable, Sequence


def render_table(
    headers: Sequence[str],
    rows: Iterable[Sequence[Any]],
    *,
    separator: str = " | ",
    right_align: set[int] | None = None,
) -> str:
    """Return the table as text, padding every column to its widest cell."""
    right = right_align or set()
    body = [["" if cell is None else str(cell) for cell in row] for row in rows]
    widths = [len(header) for header in headers]
    for row in body:
        for index, cell in enumerate(row):
            if index >= len(widths):
                widths.append(len(cell))
            else:
                widths[index] = max(widths[index], len(cell))

    def format_row(cells: Sequence[str]) -> str:
        padded = [
            cell.rjust(widths[index]) if index in right else cell.ljust(widths[index])
            for index, cell in enumerate(cells)
        ]
        return separator.join(padded).rstrip()

    rule = separator.replace("|", "+").join("-" * width for width in widths)
    lines = [format_row([str(header) for header in headers]), rule]
    lines.extend(format_row(row) for row in body)
    return "\n".join(lines)


if __name__ == "__main__":
    rows = [(1, "Ada"), (2, "Bo Longname")]
    print(render_table(["id", "name"], rows, right_align={0}))