feat(web): wire terminal panel to live process websocket

Co-Authored-By: Claude <noreply@anthropic.com>

web/src/components/layout/WorkspaceShell.tsx

@@ -135,7 +135,7 @@ export function WorkspaceShell({ workspaceId }: WorkspaceShellProps) {
                 <>
                   <PanelResizeHandle className="h-1 bg-border transition-colors hover:bg-accent" />
                   <Panel defaultSize={30} minSize={10} maxSize={70}>
-                    <TerminalPanel />
+                    <TerminalPanel workspaceId={workspaceId} />
                   </Panel>
                 </>
               )}

web/src/components/terminal/TerminalPanel.tsx

@@ -2,10 +2,23 @@ import { FitAddon } from "@xterm/addon-fit";
 import { Terminal } from "@xterm/xterm";
 import { useEffect, useRef, useState } from "react";
 
-export function TerminalPanel() {
-  const containerRef = useRef<HTMLDivElement>(null);
-  const [failed, setFailed] = useState(false);
+import { useProcessWebSocket } from "@/lib/api/process";
 
+interface TerminalPanelProps {
+  workspaceId: string | null;
+}
+
+export function TerminalPanel({ workspaceId }: TerminalPanelProps) {
+  const containerRef = useRef<HTMLDivElement>(null);
+  const terminalRef = useRef<Terminal | null>(null);
+  const fitAddonRef = useRef<FitAddon | null>(null);
+  const hasWelcomedRef = useRef(false);
+  const isDeadRef = useRef(false);
+  const [failed, setFailed] = useState(false);
+  const [isDead, setIsDead] = useState(false);
+  const { status, send, onData } = useProcessWebSocket(workspaceId);
+
+  // Initialize xterm once and keep it alive across WS status changes.
   useEffect(() => {
     const container = containerRef.current;
     if (!container) return;
@@ -28,12 +41,8 @@ export function TerminalPanel() {
       fitAddon = new FitAddon();
       terminal.loadAddon(fitAddon);
       terminal.open(container);
-      terminal.writeln("codespace terminal");
-      terminal.writeln("Mock session initialized. No process is attached.");
-      terminal.writeln("");
-      terminal.writeln("$ pnpm test");
-      terminal.writeln("mock: 3 files checked, 0 failures");
-      terminal.write("$ ");
+      terminalRef.current = terminal;
+      fitAddonRef.current = fitAddon;
     } catch {
       setFailed(true);
       terminal?.dispose();
@@ -72,9 +81,57 @@ export function TerminalPanel() {
       window.removeEventListener("resize", handleResize);
       terminal?.dispose();
       fitAddon?.dispose();
+      terminalRef.current = null;
+      fitAddonRef.current = null;
     };
   }, []);
 
+  // Reset per-workspace state and wire the active socket to xterm.
+  useEffect(() => {
+    const terminal = terminalRef.current;
+    if (!terminal || !workspaceId) return;
+
+    hasWelcomedRef.current = false;
+    isDeadRef.current = false;
+    setIsDead(false);
+
+    const removeInputHandler = terminal.onData((input) => {
+      if (!isDeadRef.current) {
+        send(input);
+      }
+    }).dispose;
+
+    const unsubscribeData = onData((chunk) => {
+      terminal.write(chunk);
+      if (chunk.startsWith("[process exited")) {
+        isDeadRef.current = true;
+        setIsDead(true);
+      }
+    });
+
+    return () => {
+      removeInputHandler();
+      unsubscribeData();
+    };
+  }, [workspaceId, send, onData]);
+
+  // Print a one-time welcome banner the first time the socket opens.
+  useEffect(() => {
+    const terminal = terminalRef.current;
+    if (!terminal || !workspaceId || status !== "open") return;
+    if (hasWelcomedRef.current) return;
+    hasWelcomedRef.current = true;
+    terminal.write(`\r\n[connected to ${workspaceId}]\r\n$ `);
+  }, [status, workspaceId]);
+
+  if (!workspaceId) {
+    return (
+      <section className="flex h-full w-full items-center justify-center bg-background text-sm text-muted-foreground">
+        Select a workspace to use the terminal.
+      </section>
+    );
+  }
+
   if (failed) {
     return (
       <section className="flex h-full w-full items-center justify-center bg-background text-sm text-muted-foreground">
@@ -83,9 +140,22 @@ export function TerminalPanel() {
     );
   }
 
+  const statusHint = isDead
+    ? "process exited — use the toolbar to start"
+    : status === "error"
+      ? "terminal disconnected"
+      : status === "connecting"
+        ? "connecting…"
+        : null;
+
   return (
-    <section className="h-full w-full overflow-hidden bg-[#171717] p-2">
-      <div ref={containerRef} className="h-full w-full" />
+    <section className="flex h-full w-full flex-col overflow-hidden bg-[#171717]">
+      {statusHint && (
+        <div className="flex h-6 shrink-0 items-center px-2 text-[11px] text-muted-foreground">
+          {statusHint}
+        </div>
+      )}
+      <div ref={containerRef} className="min-h-0 flex-1 p-2" />
     </section>
   );
 }