init: add source code from src.zip

src/hooks/useFileHistorySnapshotInit.ts

@@ -0,0 +1,25 @@
+import { useEffect, useRef } from 'react'
+import {
+  type FileHistorySnapshot,
+  type FileHistoryState,
+  fileHistoryEnabled,
+  fileHistoryRestoreStateFromLog,
+} from '../utils/fileHistory.js'
+
+export function useFileHistorySnapshotInit(
+  initialFileHistorySnapshots: FileHistorySnapshot[] | undefined,
+  fileHistoryState: FileHistoryState,
+  onUpdateState: (newState: FileHistoryState) => void,
+): void {
+  const initialized = useRef(false)
+
+  useEffect(() => {
+    if (!fileHistoryEnabled() || initialized.current) {
+      return
+    }
+    initialized.current = true
+    if (initialFileHistorySnapshots) {
+      fileHistoryRestoreStateFromLog(initialFileHistorySnapshots, onUpdateState)
+    }
+  }, [fileHistoryState, initialFileHistorySnapshots, onUpdateState])
+}