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import { posix } from "../deps/path.ts";import modifyUrls from "./modify_urls.ts";import { normalizePath } from "../core/utils/path.ts";
import type Site from "../core/site.ts";
/** A plugin to convert links to source files to the final page */export default function () {  return (site: Site) => {    const cache = new Map<string, string | null>();
    site.addEventListener("beforeUpdate", () => cache.clear());
    site.use(modifyUrls({      fn(url, page) {        // It's a pretty url or absolute url, so we don't need to do anything        if (ignore(url)) {          return url;        }
        let [file, rest] = getPathInfo(url);
        if (!file.startsWith("~")) {          file = posix.resolve(            posix.dirname(normalizePath(page.src.path)),            file,          );        }
        if (cache.has(file)) {          const cached = cache.get(file);          return cached ? cached + rest : url;        }
        try {          const resolved = file.startsWith("~")            ? site.url(file)            : site.url(`~${file}`);
          cache.set(file, resolved);          return resolved + rest;        } catch {          cache.set(file, null);        }
        return url;      },    }));  };}
/** * Split the filename and the extra content (query or hash) from a path * Example: "/foo.md?hello=world" => ["/foo.md", "?hello=world"] * Example: "/foo.md#hello=world" => ["/foo.md", "#hello=world"] */export function getPathInfo(path: string): [string, string] {  let file = path, rest = "";
  if (path.includes("?")) {    [file, rest] = path.split("?", 2);    rest = `?${rest}`;  } else if (path.includes("#")) {    [file, rest] = path.split("#", 2);    rest = `#${rest}`;  }
  return [file, rest];}
function ignore(url: string) {  return !url ||    url.startsWith("?") ||    url.startsWith("#") ||    url.startsWith("data:") ||    url.includes("//") ||    (url.endsWith("/") && !url.startsWith("~")); // Pretty url}