Extracting multiple agencies from a GTFS file

Question

I can use the transitland-lib to extract a single agency from a GTFS file and create a new one like this:

sudo ./transitland-linux extract -extract-agency 53 germany.gtfs.zip my_agency.gtfs.zip

Is there a convenient way of extracting multiple agencies in a similar fashion? So e.g. can I somehow use the extract command somewhat like this:

sudo ./transitland-linux extract -extract-agency 53,54 germany.gtfs.zip my_agency.gtfs.zip

.. to create a new GTFS file that contains only agency 53 and 54?

Answer 1

This can be done by using the onebusaway-gtfs-transformer-cli command-line application.

Specifically "retain an entity":

{"op":"retain", "match":{"file":"agency.txt", "agency_id":"53"}}
{"op":"retain", "match":{"file":"agency.txt", "agency_id":"54"}}