fix(tracker): follow active hyprland and visible x11 windows

src/window-trackers/hyprland-tracker.test.ts

@@ -0,0 +1,72 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  selectHyprlandMpvWindow,
+  type HyprlandClient,
+} from './hyprland-tracker';
+
+function makeClient(overrides: Partial<HyprlandClient> = {}): HyprlandClient {
+  return {
+    address: '0x1',
+    class: 'mpv',
+    at: [0, 0],
+    size: [1280, 720],
+    mapped: true,
+    hidden: false,
+    ...overrides,
+  };
+}
+
+test('selectHyprlandMpvWindow ignores hidden and unmapped mpv clients', () => {
+  const selected = selectHyprlandMpvWindow(
+    [
+      makeClient({
+        address: '0xhidden',
+        hidden: true,
+      }),
+      makeClient({
+        address: '0xunmapped',
+        mapped: false,
+      }),
+      makeClient({
+        address: '0xvisible',
+        at: [100, 200],
+        size: [1920, 1080],
+      }),
+    ],
+    {
+      targetMpvSocketPath: null,
+      activeWindowAddress: null,
+      getWindowCommandLine: () => null,
+    },
+  );
+
+  assert.equal(selected?.address, '0xvisible');
+});
+
+test('selectHyprlandMpvWindow prefers active visible window among socket matches', () => {
+  const commandLines = new Map<string, string>([
+    ['10', 'mpv --input-ipc-server=/tmp/subminer.sock first.mkv'],
+    ['20', 'mpv --input-ipc-server=/tmp/subminer.sock second.mkv'],
+  ]);
+
+  const selected = selectHyprlandMpvWindow(
+    [
+      makeClient({
+        address: '0xfirst',
+        pid: 10,
+      }),
+      makeClient({
+        address: '0xsecond',
+        pid: 20,
+      }),
+    ],
+    {
+      targetMpvSocketPath: '/tmp/subminer.sock',
+      activeWindowAddress: '0xsecond',
+      getWindowCommandLine: (pid) => commandLines.get(String(pid)) ?? null,
+    },
+  );
+
+  assert.equal(selected?.address, '0xsecond');
+});