Keep the connection state in the status bar on /query (closes #235)

/query set the status bar to [connected] whatever the connection
state. Before /connect, it made the status bar say [connected] while
the client had no session.

/query now reads the connection state with the nick, as /window does,
and shows [connected] only while the client is connected,
[disconnected] otherwise. TestQueryConnectionState types /query bob,
connected and not, and checks the status bar. It names the two status
texts as constants, because the linter asks for one once a third copy
appears.

Model: opus-5-5

internal/cli/app.go

@@ -402,10 +402,16 @@ func (a *App) cmdQuery(nick string) {
 	a.mu.Lock()
 	a.target = nick
 	myNick := a.nick
+	connected := a.connected
 	a.mu.Unlock()
 
+	connStatus := "disconnected"
+	if connected {
+		connStatus = "connected"
+	}
+
 	a.ui.SwitchToBuffer(nick)
-	a.ui.SetStatus(myNick, nick, "connected")
+	a.ui.SetStatus(myNick, nick, connStatus)
 }
 
 func (a *App) cmdTopic(args string) {

internal/cli/app_internal_test.go

@@ -23,6 +23,13 @@ const (
 	testText      = "hello"
 )
 
+// What the status bar shows while the client is connected, and
+// while it is not.
+const (
+	statusConnected    = "[connected]"
+	statusDisconnected = "[disconnected]"
+)
+
 // eventLoopTimeout is how long a test waits for a typed line to
 // be handled, for the welcome lines, for the UI to stop, for a poll
 // or for a poll loop to end, before it fails.
@@ -361,6 +368,46 @@ func TestWindowConnectionState(t *testing.T) {
 	}
 }
 
+// TestQueryConnectionState checks that typing /query bob leaves the
+// status bar showing [connected] only while the client is connected,
+// and [disconnected] otherwise.
+func TestQueryConnectionState(t *testing.T) {
+	t.Parallel()
+
+	const line = "/query " + testOtherNick
+
+	tests := []struct {
+		name      string
+		connected bool
+		want      string
+	}{
+		{name: "not connected", connected: false, want: statusDisconnected},
+		{name: "connected", connected: true, want: statusConnected},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			app := &App{ui: NewUI(), nick: testNick, connected: test.connected}
+			handled := handledLines(app)
+			runUI(t, app.ui)
+
+			for _, r := range line {
+				app.ui.app.QueueEvent(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
+			}
+
+			app.ui.app.QueueEvent(tcell.NewEventKey(tcell.KeyEnter, 0, tcell.ModNone))
+			waitHandled(t, handled, line)
+
+			status := statusBarText(app.ui)
+			if !strings.Contains(status, test.want) {
+				t.Fatalf("status bar is %q, want it to show %s", status, test.want)
+			}
+		})
+	}
+}
+
 // TestEventLoopKeepsRunning sends Alt and 1, then a typed line and
 // Enter, to a running UI. It checks that both are handled, so the
 // event loop did not stop on either.