Pin down a file on disk from four parameters.

Pin down a file on disk from four parameters.

locate_one_file(filename = NULL, data_dir = tempdir(), year = NULL,
  type = NULL)

Arguments

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.
data_dir

Where sets of downloaded data would be found.
year

Single year for which file is to be found.
type

One of: 'Accidents', 'Casualties', 'Vehicles'; ignores case.

Value

One of: path for one file, a message More than one file found or error if none found.

Examples

locate_one_file()
#> This will download 240 MB+ (1.8 GB unzipped).
#> Coordinates unreliable in this data.
#> [1] "More than one csv file found."
locate_one_file(filename = "Cas.csv")
#> This will download 240 MB+ (1.8 GB unzipped).
#> Coordinates unreliable in this data.
#> [1] "/tmp/RtmpGajYm7/dftRoadSafetyData_Casualties_2017/Cas.csv"