Decode raw binary content for string array for the bufnr buffer

import { Denops } from "../mod.ts";
import * as fn from "../function/mod.ts";
import { decode, open, replace } from "../buffer/mod.ts";

export async function main(denops: Denops): Promise<void> {
  await open(denops, "README.md");
  const bufnr = (await fn.bufnr(denops)) as number;
  const data = await Deno.readFile("README.md");
  const { content } = await decode(denops, bufnr, data);
  await replace(denops, bufnr, content);
}

It follows Vim's rule to find a corresponding fileformat and fileencoding to decode the data if the one is not given by options.