app/lib/media/resolvers/posts.server.ts

Functions

Imports

It imports app/db/index.ts, app/lib/media/resolvers.server.ts. Imported by app/lib/media/resolvers.server.ts.

Source

1import { listPostSourcesForCitations } from "~/db";
2
3import type { MediaCitation, ReferenceResolver } from "../resolvers.server";
4
5// Detected by SUBSTRING and only then classified, so an unknown syntax still counts (as `other`).
6// It cannot see runtime-assembled references or citations from outside the post corpus.
7export const postsResolver: ReferenceResolver = async (env, keys) => {
8  const out = new Map<string, MediaCitation[]>(keys.map((key) => [key, []]));
9  if (keys.length === 0) return out;
10
11  // Deliberately not caught: the failure must reach `resolveCitations` so a delete fails closed.
12  const posts = await listPostSourcesForCitations(env);
13
14  for (const post of posts) {
15    const slug = post.slug;
16    const title = post.title || slug;
17    const markdown = post.body ?? "";
18    const coverSrc = post.coverImage ?? "";
19
20    for (const key of keys) {
21      const url = `/media/${key}`;
22      const found = out.get(key);
23      if (!found) continue;
24
25      if (coverSrc === url || coverSrc === key) {
26        found.push({ type: "post", id: slug, title, form: "frontmatter-cover", detail: "cover image" });
27      }
28
29      let at = markdown.indexOf(url);
30      while (at !== -1) {
31        found.push({
32          type: "post",
33          id: slug,
34          title,
35          form: classify(markdown, at),
36          detail: `line ${lineOf(markdown, at)}`,
37        });
38        at = markdown.indexOf(url, at + url.length);
39      }
40    }
41  }
42
43  return out;
44};
45
46// A lookbehind, not a parse: a wrong guess downgrades the label, never the detection.
47function classify(source: string, at: number): MediaCitation["form"] {
48  const before = source.slice(Math.max(0, at - 120), at);
49  if (/:::figure\{[^}]*src="?$/.test(before) || /:::figure\{[^}]*src=$/.test(before)) {
50    return "figure-directive";
51  }
52  if (/src\s*=\s*["']?$/.test(before) && /<[a-z]+[^>]*$/i.test(before)) return "html";
53  if (/!\[[^\]]*\]\($/.test(before)) return "markdown-image";
54  if (/\[[^\]]*\]\($/.test(before)) return "link";
55  return "other";
56}
57
58function lineOf(source: string, at: number) {
59  let line = 1;
60  for (let i = 0; i < at; i += 1) if (source.charCodeAt(i) === 10) line += 1;
61  return line;
62}