app/lib/patch.ts

Functions

Imports

It imports no other module of this repo. Imported by app/routes/book.history.tsx, app/routes/history.tsx.

Source

1// A unified patch for two texts that are both in Carrel (a working draft against the site's text,
2// or against an AI draft). The site's own revision diffs come ready-made from site-api and use the
3// same library, so every patch the history screens show has the same shape. Pure, so the server
4// builds it and a test reads it.
5
6import { createTwoFilesPatch } from "diff";
7
8/**
9 * The patch from `before` to `after`, three lines of context. Both sides carry the same file name,
10 * so the viewer shows one file changed and not a rename; what each side is goes in its header.
11 * Texts that are the same give a patch with no hunks, which the viewer says in words.
12 */
13export function unifiedPatch(name: string, before: { text: string; label: string }, after: { text: string; label: string }): string {
14  return createTwoFilesPatch(name, name, before.text, after.text, before.label, after.label, { context: 3 });
15}
16
17/** True when a patch carries at least one changed line. */
18export function hasChanges(patch: string): boolean {
19  return /^@@ /m.test(patch);
20}