lume@v2.1.4

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import { merge } from "../core/utils/object.ts";import { Page } from "../core/file.ts";import { log } from "../core/utils/log.ts";
import type Site from "../core/site.ts";
export interface Options {  /** The redirects output format */  output?: "html" | "json" | "netlify" | "vercel" | OutputStrategy;
  /** The default status code to use */  defaultStatus?: Status;}
type Status = 301 | 302 | 307 | 308;type Redirect = [string, string, Status];type OutputStrategy = (  redirects: Redirect[],  site: Site,) => Promise<void> | void;
export const defaults: Options = {  output: "html",  defaultStatus: 301,};
/** Predefined output strategies */const outputs: Record<string, OutputStrategy> = {  html,  json,  netlify,  vercel,};
export default function (userOptions?: Options) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.process("*", (pages) => {      const redirects: Redirect[] = [];
      pages.forEach((page) => {        const { url, oldUrl } = page.data;
        if (url && oldUrl) {          const oldUrls = Array.isArray(oldUrl) ? oldUrl : [oldUrl];
          for (const old of oldUrls) {            const redirect = parseRedirection(url, old, options.defaultStatus);            if (redirect) {              redirects.push(redirect);            }          }        }      });
      if (!redirects.length) {        return;      }
      const outputFn = typeof options.output === "string"        ? outputs[options.output]        : options.output;
      if (!outputFn) {        log.error(`[redirects] Invalid output format: ${options.output}`);        throw new Error(`Invalid output format: ${options.output}`);      }
      redirects.sort((a, b) => a[0].localeCompare(b[0]));
      return outputFn(redirects, site);    });  };}
const validStatusCodes = [301, 302, 303, 307, 308];
function parseRedirection(  newUrl: string,  oldUrl: string,  defaultCode: Status,): [string, string, Status] | undefined {  const [from, code] = oldUrl.split(/\s+/);  const parsedCode = code ? parseInt(code) : defaultCode;
  if (!validStatusCodes.includes(parsedCode)) {    log.error(      `Invalid status code for redirection from ${from} to ${newUrl} (${code}).`,    );    return;  }
  return [from, newUrl, parsedCode as Status];}
/** HTML redirect */function html(redirects: Redirect[], site: Site): void {  for (const [url, to, statusCode] of redirects) {    const timeout = (statusCode === 301 || statusCode === 308) ? 0 : 1;    const content = `<!DOCTYPE html><html lang="en"><head>  <meta charset="utf-8">  <title>Redirecting…</title>  <meta http-equiv="refresh" content="${timeout}; url=${to}"></head><body>  <h1>Redirecting…</h1>  <a href="${to}">Click here if you are not redirected.</a></body></html>`;    const page = Page.create({ url, content });    site.pages.push(page);  }}
/** JSON redirect (to use with redirect middleware) */function json(redirects: Redirect[], site: Site): void {  const obj = Object.fromEntries(    redirects.map((      [from, to, code],    ) => [from, code === 301 ? to : { to, code }]),  );  const page = Page.create({    url: "_redirects.json",    content: JSON.stringify(obj, null, 2),  });  site.pages.push(page);}
/** Netlify redirect */async function netlify(redirects: Redirect[], site: Site): Promise<void> {  const content = redirects.map(([from, to, code]) => `${from} ${to} ${code}`)    .join("\n");  const page = await site.getOrCreatePage("_redirects");  page.content = content;}
/** Vercel redirect */async function vercel(redirects: Redirect[], site: Site): Promise<void> {  const config = {    redirects: redirects.map(([source, destination, statusCode]) => ({      source,      destination,      statusCode,    })),  };
  const page = await site.getOrCreatePage("vercel.json");  const content = JSON.parse(page.content as string | undefined || "{}");  Object.assign(content, config);  page.content = JSON.stringify(content, null, 2);}
/** Extends Data interface */declare global {  namespace Lume {    export interface Data {      /**       * The old url(s) of a page       * @see https://lume.land/plugins/redirects/       */      oldUrl?: string | string[];    }  }}