lume@v2.1.4

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import { join, posix } from "../deps/path.ts";import { merge } from "../core/utils/object.ts";
import type { Middleware } from "../core/server.ts";
export interface Options {  root: string;  page404: string;  directoryIndex?: boolean;}
export const defaults: Options = {  root: `${Deno.cwd()}/_site`,  page404: "/404.html",  directoryIndex: false,};
/** Show a 404 page */export default function notFound(userOptions?: Partial<Options>): Middleware {  const options = merge(defaults, userOptions);  let { root, page404, directoryIndex } = options;
  if (page404.endsWith("/")) {    page404 += "index.html";  }
  return async (request, next) => {    const response = await next(request);
    if (response.status === 404) {      const { headers, status } = response;      headers.set("content-type", "text/html; charset=utf-8");
      try {        const body = await Deno.readFile(join(root, page404));        return new Response(body, { status, headers });      } catch {        if (directoryIndex) {          const { pathname } = new URL(request.url);          const body = await getDirectoryIndex(root, pathname);          return new Response(body, { status, headers });        }      }    }
    return response;  };}
/** Generate the default body for a 404 response */async function getDirectoryIndex(root: string, file: string): Promise<string> {  const folders: [string, string][] = [];  const files: [string, string][] = [];
  try {    for await (const info of Deno.readDir(join(root, file))) {      info.isDirectory        ? folders.push([`${info.name}/`, `📁 ${info.name}/`])        : files.push([          info.name === "index.html" ? "./" : info.name,          `📄 ${info.name}`,        ]);    }  } catch {    // It's not a directory, so scan the parent directory    try {      const base = posix.dirname(file);      for await (const info of Deno.readDir(join(root, base))) {        info.isDirectory          ? folders.push([            posix.join(base, `${info.name}/`),            `📁 ${info.name}/`,          ])          : files.push([            posix.join(base, info.name === "index.html" ? "./" : info.name),            `📄 ${info.name}`,          ]);      }    } catch {      // Ignore    }  }
  const content = folders.concat(files);
  if (file.match(/.+\/.+/)) {    content.unshift(["../", ".."]);  }
  return `  <!DOCTYPE html>    <html lang="en">    <head>      <meta charset="UTF-8">      <meta name="viewport" content="width=device-width, initial-scale=1.0">      <title>404 - Not found</title>      <style> body { font-family: sans-serif; max-width: 40em; margin: auto; padding: 2em; line-height: 1.5; }</style>    </head>    <body>      <h1>404 - Not found</h1>      <p>The URL <code>${file}</code> does not exist</p>      <ul>    ${    content.map(([url, name]) => `      <li>        <a href="${url}">          ${name}        </a>      </li>`).join("\n")  }      </ul>    </body>  </html>`;}