Massive restructure of plugin API

plug-api/lib/util.ts

@@ -0,0 +1,36 @@
+import { editor } from "$sb/silverbullet-syscall/mod.ts";
+
+export async function replaceAsync(
+  str: string,
+  regex: RegExp,
+  asyncFn: (match: string, ...args: any[]) => Promise<string>,
+) {
+  const promises: Promise<string>[] = [];
+  str.replace(regex, (match: string, ...args: any[]): string => {
+    const promise = asyncFn(match, ...args);
+    promises.push(promise);
+    return "";
+  });
+  const data = await Promise.all(promises);
+  return str.replace(regex, () => data.shift()!);
+}
+
+export function isServer() {
+  return (
+    typeof window === "undefined" || typeof window.document === "undefined"
+  ); // if something defines window the same way as the browser, this will fail.
+}
+
+// this helps keep if's condition as positive
+export function isBrowser() {
+  return !isServer();
+}
+
+export function notifyUser(message: string, type?: "info" | "error") {
+  if (isBrowser()) {
+    return editor.flashNotification(message, type);
+  }
+  const log = type === "error" ? console.error : console.log;
+  log(message); // we should end up sending the message to the user, users dont read logs.
+  return;
+}