Function validateDataNotEmpty

ftv.go:27–39

validateDataNotEmpty checks if buffer has data rows and exits if empty

(b *Buffer, source string)

// validateDataNotEmpty checks if buffer has data rows and exits if empty
func validateDataNotEmpty(b *Buffer, source string) error {
	dataRows := b.rowLen - b.rowFreeze
	if b.rowLen == 0 || dataRows <= 0 {
		stopView()
		if b.rowLen == 0 {
			fmt.Printf("⚠️  %s is empty (no rows)\n", source)
		} else {
			fmt.Printf("⚠️  %s is empty (only header, no data rows)\n", source)
		}
		os.Exit(0)
	}
	return nil
}

// startAsyncUpdateHandler manages UI updates during async loading
func startAsyncUpdateHandler(updateChan <-chan bool, doneChan <-chan error) {