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import { unidecode } from "../deps/unidecode.ts";import { merge } from "../core/utils.ts";
import type { Helper, Page, Site } from "../core.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions: string[];
  /** Convert the paths to lower case */  lowercase: boolean;
  /** Remove all non-alphanumeric characters */  alphanumeric: boolean;
  /** Character used as word separator */  separator: string;
  /** Characters to replace */  replace: {    [index: string]: string;  };
  /** Words to remove */  stopWords: string[];}
// Default optionsexport const defaults: Options = {  extensions: [".html"],  lowercase: true,  alphanumeric: true,  separator: "-",  replace: {    "Ð": "D", // eth    "ð": "d",    "Đ": "D", // crossed D    "đ": "d",    "ø": "o",    "ß": "ss",    "æ": "ae",    "œ": "oe",  },  stopWords: [],};
/** A plugin to slugify all URLs, replacing non-URL-safe characters */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);  const slugify = createSlugifier(options);
  return (site: Site) => {    site.filter("slugify", slugify as Helper);    site.preprocess(options.extensions, slugifyUrls);  };
  function slugifyUrls(page: Page) {    if (typeof page.data.url === "string") {      page.data.url = slugify(page.data.url);    }  }}
export function createSlugifier(  options: Options = defaults,): (string: string) => string {  const { lowercase, alphanumeric, separator, replace, stopWords } = options;
  return function (string) {    if (lowercase) {      string = string.toLowerCase();    }
    string = string.replaceAll(/[^a-z\d/.-]/giu, (char) => {      if (char in replace) {        return replace[char];      }
      if (alphanumeric) {        char = char.normalize("NFKD").replaceAll(/[\u0300-\u036F]/g, "");        char = unidecode(char).trim();      }
      char = /[\p{L}\u0300-\u036F]+/u.test(char) ? char : "-";
      return alphanumeric && /[^\w-]+/.test(char) ? "" : char;    });
    if (lowercase) {      string = string.toLowerCase();    }
    // remove stop words    string = string.trim().split(/-+/).filter((word) =>      stopWords.indexOf(word) === -1    ).join("-");
    // clean url    string = string.replaceAll(      /(?<=^|[/.])-+(?=[^/.-])|(?<=[^/.-])-+(?=$|[/.])/g,      "",    );
    // replace dash with separator    return string.replaceAll("-", separator);  };}