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import { Helper, Site } from "../core.ts";import {  markdownIt,  markdownItAttrs,  markdownItDeflist,  markdownItReplaceLink,} from "../deps/markdown_it.ts";import loader from "../core/loaders/text.ts";import Markdown from "../core/engines/markdown.ts";import { merge } from "../core/utils.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions: string[];
  /** Options passed to markdown-it library */  options: Partial<MarkdownItOptions>;
  /** The list of markdown-it plugins to use */  plugins: unknown[];}
export interface MarkdownItOptions {  /** Set `true` to enable HTML tags in source */  html?: boolean;
  /**   * Use '/' to close single tags (<br />).   * This is only for full CommonMark compatibility.   */  xhtmlOut?: boolean;
  /** Convert '\n' in paragraphs into <br> */  breaks?: boolean;
  /**   * CSS language prefix for fenced blocks.   * Can be useful for external highlighters.   */  langPrefix?: string;
  /** Autoconvert URL-like text to links */  linkify?: boolean;
  /** Enable some language-neutral replacement + quotes beautification */  typographer?: boolean;
  /**   * Double + single quotes replacement pairs, when typographer enabled,   * and smartquotes on. Could be either a String or an Array.   * For example, you can use '«»„“' for Russian, '„“‚‘' for German,   * and ['«\xA0', '\xA0»', '‹\xA0', '\xA0›'] for French (including nbsp).   */  quotes?: string | string[];
  /**   * Highlighter function. Should return escaped HTML,   * or '' if the source string is not changed and should be escaped externally.   * If result starts with <pre... internal wrapper is skipped.   */  highlight?: (str: string, lang: string) => string | null;}
// Default optionsconst defaults: Options = {  extensions: [".md"],  options: {    html: true,  },  plugins: [    markdownItAttrs,    markdownItDeflist,    markdownItReplaceLink,  ],};
/** A plugin to add support for Markdown */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);
  return function (site: Site) {    const engine = createMarkdown(site, options);
    site.loadPages(options.extensions, loader, new Markdown(engine));    site.filter("md", filter as Helper);
    function filter(string: string, inline = false): string {      return inline        ? engine.renderInline(string || "").trim()        : engine.render(string || "").trim();    }  };}
function createMarkdown(site: Site, options: Options) {  // @ts-ignore: This expression is not callable.  const markdown = markdownIt({    replaceLink(link: string) {      return site.url(link);    },    ...options.options,  });
  options.plugins.forEach((plugin) =>    Array.isArray(plugin) ? markdown.use(...plugin) : markdown.use(plugin)  );
  return markdown;}