check_input_file.RdLocal helper to be reused.
check_input_file(filename = NULL, type = NULL, data_dir = NULL, year = NULL)
| filename | Character string of the filename of the .csv to read, if this is given, type and years determine whether there is a target to read, otherwise disk scan would be needed. |
|---|---|
| type | The type of file to be downloaded (e.g. 'Accidents', 'Casualties' or 'Vehicles'). Not case sensitive and searches using regular expressions ('acc' will work). |
| data_dir | Where sets of downloaded data would be found. |
| year | Single year for which data are to be read |