Function fileHistoryRestoreStateFromLog

src/utils/fileHistory.ts:888–917

(
  fileHistorySnapshots: FileHistorySnapshot[],
  onUpdateState: (newState: FileHistoryState) => void,
)

 * Restores file history snapshot state for a given log option.
 */
export function fileHistoryRestoreStateFromLog(
  fileHistorySnapshots: FileHistorySnapshot[],
  onUpdateState: (newState: FileHistoryState) => void,
): void {
  if (!fileHistoryEnabled()) {
    return
  }
  // Make a copy of the snapshots as we migrate from absolute path to
  // shortened relative tracking path.
  const snapshots: FileHistorySnapshot[] = []
  // Rebuild the tracked files from the snapshots
  const trackedFiles = new Set<string>()
  for (const snapshot of fileHistorySnapshots) {
    const trackedFileBackups: Record<string, FileHistoryBackup> = {}
    for (const [path, backup] of Object.entries(snapshot.trackedFileBackups)) {
      const trackingPath = maybeShortenFilePath(path)
      trackedFiles.add(trackingPath)
      trackedFileBackups[trackingPath] = backup
    }
    snapshots.push({
      ...snapshot,
      trackedFileBackups: trackedFileBackups,
    })
  }
  onUpdateState({
    snapshots: snapshots,
    trackedFiles: trackedFiles,
    snapshotSequence: snapshots.length,
  })
}

/**
 * Copy file history snapshots for a given log option.