app/lib/not-found-query.mjs

Functions

Imports

It imports no other module of this repo. Imported by app/components/not-found-help.tsx.

Source

1// Plain .mjs so `node --test` can import it; the types are JSDoc under checkJs.
2
3/**
4 * The words of a missing address, to start the 404 page's search box with: the last path segment
5 * with any file extension off, split on everything that is not a letter or digit. Number-only words
6 * are dropped, because a bare year is a search filter and an old dated address would otherwise
7 * narrow the search to that year. Percent escapes are dropped rather than decoded, since a malformed
8 * one would throw. Empty when nothing useful is left, and the box then shows its placeholder.
9 *
10 * @param {string} pathname
11 * @returns {string}
12 */
13export function notFoundQuery(pathname) {
14  const segments = pathname.split("/").filter((segment) => segment.length > 0);
15  const last = segments.at(-1) ?? "";
16  const words = last
17    .replace(/%[0-9A-Fa-f]{2}/g, " ")
18    .replace(/\.[A-Za-z0-9]{1,5}$/, "")
19    .split(/[^\p{L}\p{N}]+/u)
20    .filter((word) => word.length > 0 && !/^\p{N}+$/u.test(word));
21  return words.join(" ").slice(0, 100).trim();
22}