documentation server and /doc route

Signed-off-by: ngn <ngn@ngn.tf>

app/src/lib/doc.js

@@ -0,0 +1,28 @@
+import { urljoin } from "$lib/util.js";
+
+function doc_urljoin(path = null, query = {}) {
+  return urljoin(import.meta.env.APP_DOC_URL, path, query);
+}
+
+function doc_check_err(json) {
+  if ("error" in json) throw new Error(`Documentation server returned an error: ${json["error"]}`);
+}
+
+async function doc_http_get(fetch, url) {
+  const res = await fetch(url);
+  const json = await res.json();
+  doc_check_err(json);
+  return json;
+}
+
+async function doc_get_list(fetch) {
+  return (await doc_http_get(fetch, doc_urljoin("/list")))["list"];
+}
+
+async function doc_get(fetch, name) {
+  let url = doc_urljoin("/get");
+  url = urljoin(url, name);
+  return await doc_http_get(fetch, url);
+}
+
+export { doc_urljoin, doc_get, doc_get_list };