cleanup doc.js for a better export interface

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

app/src/lib/doc.js

@@ -1,31 +1,36 @@
-// TODO: clean this up like api.js
-
 import { urljoin } from "$lib/util.js";
 
-function doc_urljoin(path = null, query = {}) {
-  return urljoin(import.meta.env.WEBSITE_DOC_URL, path, query);
+class Doc {
+  // join given path and queries with a document server URL
+  join(path = null, query = {}) {
+    return urljoin(import.meta.env.WEBSITE_DOC_URL, path, query);
+  }
+
+  // check JSON response and throw an error if it contains one
+  check_err(json) {
+    if ("error" in json)
+      throw new Error(`Doc server returned an error: ${json["error"]}`);
+  }
+
+  // send a HTTP request to the documentation server
+  async GET(fetch, url) {
+    const res = await fetch(url);
+    const json = await res.json();
+    this.check_err(json);
+    return json;
+  }
+
+  // get a list of all the documentations
+  async list(fetch) {
+    return await this.GET(fetch, this.join("/list"));
+  }
+
+  // get a documentation
+  async get(fetch, name) {
+    let url = this.join(`/get/${name}`);
+    return await this.GET(fetch, url);
+  }
 }
 
-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"));
-}
-
-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 };
+const doc = new Doc();
+export default doc;