Integrate PSQL shell in quick start guide (#1333)

src/hooks/useKnockoutExplorer.ts

@@ -1,4 +1,4 @@
-import { useTabs } from "hooks/useTabs";
+import { ReactTabKind, useTabs } from "hooks/useTabs";
 import { useEffect, useState } from "react";
 import { applyExplorerBindings } from "../applyExplorerBindings";
 import { AuthType } from "../AuthType";
@@ -100,7 +100,11 @@ async function configureHosted(): Promise<Explorer> {
       }
 
       if (event.data?.type === MessageTypes.CloseTab) {
-        useTabs.getState().closeTabsByComparator((tab) => tab.tabId === event.data?.data?.tabId);
+        if (event.data?.data?.tabId === "QuickstartPSQLShell") {
+          useTabs.getState().closeReactTab(ReactTabKind.Quickstart);
+        } else {
+          useTabs.getState().closeTabsByComparator((tab) => tab.tabId === event.data?.data?.tabId);
+        }
       }
     },
     false
@@ -290,7 +294,11 @@ async function configurePortal(): Promise<Explorer> {
         } else if (shouldForwardMessage(message, event.origin)) {
           sendMessage(message);
         } else if (event.data?.type === MessageTypes.CloseTab) {
-          useTabs.getState().closeTabsByComparator((tab) => tab.tabId === event.data?.data?.tabId);
+          if (event.data?.data?.tabId === "QuickstartPSQLShell") {
+            useTabs.getState().closeReactTab(ReactTabKind.Quickstart);
+          } else {
+            useTabs.getState().closeTabsByComparator((tab) => tab.tabId === event.data?.data?.tabId);
+          }
         }
       },
       false

src/hooks/useTerminal.ts

@@ -0,0 +1,26 @@
+import postRobot from "post-robot";
+import create, { UseStore } from "zustand";
+
+interface TerminalState {
+  terminalWindow: Window;
+  setTerminal: (terminalWindow: Window) => void;
+  sendMessage: (message: string) => void;
+}
+
+export const useTerminal: UseStore<TerminalState> = create((set, get) => ({
+  terminalWindow: undefined,
+  setTerminal: (terminalWindow: Window) => {
+    set({ terminalWindow });
+  },
+  sendMessage: (message: string) => {
+    const terminalWindow = get().terminalWindow;
+    postRobot.send(
+      terminalWindow,
+      "sendMessage",
+      { type: "stdin", content: [message] },
+      {
+        domain: window.location.origin,
+      }
+    );
+  },
+}));