feat: move snippets, keybinding actions and macros out of core into plugins

plugins/snippets/src/frontend/prompt-store.ts

@@ -0,0 +1,72 @@
+import { useSyncExternalStore } from "react";
+import type { SnippetHostContext } from "../shared/variables.js";
+
+export interface PendingPrompt {
+  snippet: { name: string; content: string };
+  host: SnippetHostContext | null;
+  settle: (values: Record<string, string> | null) => void;
+}
+
+let pending: PendingPrompt | null = null;
+let confirmExecution = false;
+const listeners = new Set<() => void>();
+
+function notify(): void {
+  for (const listener of [...listeners]) listener();
+}
+
+function subscribe(listener: () => void): () => void {
+  listeners.add(listener);
+  return () => listeners.delete(listener);
+}
+
+/**
+ * Asks for a snippet's $INPUT_n values through the dialog the overlay draws.
+ * Resolves null when the user cancels. A second request cancels the first.
+ */
+export function askForInputs(
+  snippet: { name: string; content: string },
+  host: SnippetHostContext | null,
+): Promise<Record<string, string> | null> {
+  pending?.settle(null);
+  return new Promise((resolve) => {
+    const prompt: PendingPrompt = {
+      snippet,
+      host,
+      settle: (values) => {
+        if (pending === prompt) {
+          pending = null;
+          notify();
+        }
+        resolve(values);
+      },
+    };
+    pending = prompt;
+    notify();
+  });
+}
+
+export function usePendingPrompt(): PendingPrompt | null {
+  return useSyncExternalStore(
+    subscribe,
+    () => pending,
+    () => pending,
+  );
+}
+
+/** Kept current by the overlay from the user's confirmExecution setting. */
+export function setConfirmExecution(value: boolean): void {
+  confirmExecution = value;
+}
+
+export function shouldConfirmExecution(): boolean {
+  return confirmExecution;
+}
+
+/** Cancels anything waiting, for deactivate. */
+export function resetPrompts(): void {
+  pending?.settle(null);
+  pending = null;
+  confirmExecution = false;
+  notify();
+}