feat(overlay): discover unclaimed mpv key bindings (#246)

src/core/services/ipc.test.ts

@@ -1323,3 +1323,18 @@ test('registerIpcHandlers exposes character dictionary selection handlers', asyn
   assert.deepEqual(calls, [21355]);
   assert.deepEqual(searches, ['Re:ZERO']);
 });
+
+test('mpv discovery has its own request and does not change session bindings', async () => {
+  const { registrar, handlers } = createFakeIpcRegistrar();
+  const snapshot = { keys: ['r'], blockedKeys: [] };
+  registerIpcHandlers(
+    createRegisterIpcDeps({ getMpvInputBindings: async () => snapshot }),
+    registrar,
+  );
+  const discovery = handlers.handle.get(IPC_CHANNELS.request.getMpvInputBindings);
+  const session = handlers.handle.get(IPC_CHANNELS.request.getSessionBindings);
+  assert.ok(discovery);
+  assert.ok(session);
+  assert.deepEqual(await discovery({}), snapshot);
+  assert.deepEqual(await session({}), []);
+});

src/core/services/ipc.ts

@@ -1,4 +1,5 @@
 import electron from 'electron';
+import type { MpvInputBindingsSnapshot } from '../../types/session-bindings';
 import type { BrowserWindow as ElectronBrowserWindow, IpcMainEvent } from 'electron';
 import type {
   ChangelogSnapshot,
@@ -89,6 +90,7 @@ export interface IpcServiceDeps {
   setMecabEnabled: (enabled: boolean) => void;
   handleMpvCommand: (command: Array<string | number>) => void;
   getKeybindings: () => unknown;
+  getMpvInputBindings?: () => Promise<MpvInputBindingsSnapshot>;
   getSessionBindings?: () => CompiledSessionBinding[];
   getConfiguredShortcuts: () => unknown;
   dispatchSessionAction?: (request: SessionActionDispatchRequest) => void | Promise<void>;
@@ -344,6 +346,7 @@ export interface IpcDepsRuntimeOptions {
   getMecabTokenizer: () => MecabTokenizerLike | null;
   handleMpvCommand: (command: Array<string | number>) => void;
   getKeybindings: () => unknown;
+  getMpvInputBindings?: () => Promise<MpvInputBindingsSnapshot>;
   getSessionBindings?: () => CompiledSessionBinding[];
   getConfiguredShortcuts: () => unknown;
   dispatchSessionAction?: (request: SessionActionDispatchRequest) => void | Promise<void>;
@@ -438,6 +441,7 @@ export function createIpcDepsRuntime(options: IpcDepsRuntimeOptions): IpcService
     },
     handleMpvCommand: options.handleMpvCommand,
     getKeybindings: options.getKeybindings,
+    getMpvInputBindings: options.getMpvInputBindings,
     getSessionBindings: options.getSessionBindings ?? (() => []),
     getConfiguredShortcuts: options.getConfiguredShortcuts,
     dispatchSessionAction: options.dispatchSessionAction ?? (async () => {}),
@@ -769,6 +773,10 @@ export function registerIpcHandlers(deps: IpcServiceDeps, ipc: IpcMainRegistrar
     return deps.getKeybindings();
   });
 
+  ipc.handle(IPC_CHANNELS.request.getMpvInputBindings, () => {
+    return deps.getMpvInputBindings?.() ?? { keys: [], blockedKeys: [] };
+  });
+
   ipc.handle(IPC_CHANNELS.request.getSessionBindings, () => {
     return deps.getSessionBindings?.() ?? [];
   });

src/core/services/session-bindings.ts

@@ -211,7 +211,7 @@ function parseAccelerator(
   };
 }
 
-function parseDomKeyString(
+export function parseSessionBindingKey(
   key: string,
   platform: PlatformKeyModel,
 ): { key: SessionKeySpec | null; message?: string } {
@@ -435,7 +435,7 @@ export function compileSessionBindings(input: CompileSessionBindingsInput): {
   }
 
   if (statsToggleKey) {
-    const parsed = parseDomKeyString(statsToggleKey, input.platform);
+    const parsed = parseSessionBindingKey(statsToggleKey, input.platform);
     if (!parsed.key) {
       warnings.push({
         kind: 'unsupported',
@@ -462,7 +462,7 @@ export function compileSessionBindings(input: CompileSessionBindingsInput): {
   }
 
   if (statsMarkWatchedKey) {
-    const parsed = parseDomKeyString(statsMarkWatchedKey, input.platform);
+    const parsed = parseSessionBindingKey(statsMarkWatchedKey, input.platform);
     if (!parsed.key) {
       warnings.push({
         kind: 'unsupported',
@@ -490,7 +490,7 @@ export function compileSessionBindings(input: CompileSessionBindingsInput): {
 
   input.keybindings.forEach((binding, index) => {
     if (!binding.command) return;
-    const parsed = parseDomKeyString(binding.key, input.platform);
+    const parsed = parseSessionBindingKey(binding.key, input.platform);
     if (!parsed.key) {
       warnings.push({
         kind: 'unsupported',