format

pub fn format(self: *const Font, writer: *std.Io.Writer) !void {
    const weight = switch (self.weight) {
        .normal => "",
        .bold => " Bold",
    };
    const style = switch (self.style) {
        .normal => "",
        .italic => " Italic",
    };
    try writer.print("{s}{s}{s} {d}", .{ self.familyName(), weight, style, self.size });
}