refactor: extract main runtime lifecycle helper builders

src/main/runtime/yomitan-extension-loader.ts

@@ -0,0 +1,48 @@
+import type { Extension } from 'electron';
+import type { YomitanExtensionLoaderDeps } from '../../core/services/yomitan-extension-loader';
+
+export function createLoadYomitanExtensionHandler(deps: {
+  loadYomitanExtensionCore: (options: YomitanExtensionLoaderDeps) => Promise<Extension | null>;
+  userDataPath: YomitanExtensionLoaderDeps['userDataPath'];
+  getYomitanParserWindow: YomitanExtensionLoaderDeps['getYomitanParserWindow'];
+  setYomitanParserWindow: YomitanExtensionLoaderDeps['setYomitanParserWindow'];
+  setYomitanParserReadyPromise: YomitanExtensionLoaderDeps['setYomitanParserReadyPromise'];
+  setYomitanParserInitPromise: YomitanExtensionLoaderDeps['setYomitanParserInitPromise'];
+  setYomitanExtension: YomitanExtensionLoaderDeps['setYomitanExtension'];
+}) {
+  return async (): Promise<Extension | null> => {
+    return deps.loadYomitanExtensionCore({
+      userDataPath: deps.userDataPath,
+      getYomitanParserWindow: deps.getYomitanParserWindow,
+      setYomitanParserWindow: deps.setYomitanParserWindow,
+      setYomitanParserReadyPromise: deps.setYomitanParserReadyPromise,
+      setYomitanParserInitPromise: deps.setYomitanParserInitPromise,
+      setYomitanExtension: deps.setYomitanExtension,
+    });
+  };
+}
+
+export function createEnsureYomitanExtensionLoadedHandler(deps: {
+  getYomitanExtension: () => Extension | null;
+  getLoadInFlight: () => Promise<Extension | null> | null;
+  setLoadInFlight: (promise: Promise<Extension | null> | null) => void;
+  loadYomitanExtension: () => Promise<Extension | null>;
+}) {
+  return async (): Promise<Extension | null> => {
+    const existing = deps.getYomitanExtension();
+    if (existing) {
+      return existing;
+    }
+
+    const inFlight = deps.getLoadInFlight();
+    if (inFlight) {
+      return inFlight;
+    }
+
+    const promise = deps.loadYomitanExtension().finally(() => {
+      deps.setLoadInFlight(null);
+    });
+    deps.setLoadInFlight(promise);
+    return promise;
+  };
+}