gtfstools 1.2.0

New features

New validate_gtfs() behavior. Now used to run MobilityData Canonical GTFS validator with a feed. The old behavior was marked as deprecated since v1.0.0.
New function download_validator().
New vignette demonstrating how to validate feeds.

Fixed a bug in write_gtfs() that prevented as_dir = TRUE to be used.
Fixed a bug in set_trip_speed() that resulted in invalid stop_times tables when max(stop_sequence) was higher than the number of stops of a given trip. Thanks Alena Stern (@alenastern).
Fixed a bug in set_trip_speed() that resulted in the speed of wrong trip_ids being updated because of the order that these ids would appear in the trips and stop_times tables. Thanks Alena Stern (@alenastern).

New function convert_time_to_seconds().
New function filter_by_agency_id().
New function filter_by_service_id().
New function filter_by_time_of_day().
New function filter_by_weekday().
New function frequencies_to_stop_times().
New function get_children_stops().
New function get_stop_times_patterns().
New function get_trip_length().
New parameter to merge_gtfs(): prefix. The warnings parameter was flagged as deprecated.
Functions get_parent_station() and get_children_stops now accept stop_id = NULL to analyze all stop_ids in the stops table.

Fixed a bug in which get_trip_segment_duration() would list wrong segment numbers, not necessarily starting from 1. Now segment numbers always range from 1 to N, where N is the total number of segments that compose each trip.
Fixed a bug in filter_by_{route,service,shape,trip}_id() that resulted in the agency table not getting filtered when the specified id was character(0).

Performance improvements to get_trip_geometry(), get_trip_duration(), get_trip_segment_duration() and convert_shapes_to_sf().
Stopped ordering points by shape_pt_sequence/stop_sequence in get_trip_geometry() and convert_shapes_to_sf(), since the GTFS reference says that the stop_times and shapes tables must be ordered by point/stop sequence anyway.
Removed {lwgeom} from dependencies (Suggests), now that it’s not required to run get_trip_speed() and set_trip_speed() anymore.
Removed the warnings parameter from read_gtfs() and write_gtfs() and the optional and extra parameters from write_gtfs(), flagged as deprecated on gtfstools v1.0.0.
Updated filtering vignette to demonstrate new functions.

New function convert_stops_to_sf().
New function convert_shapes_to_sf().
New function filter_by_route_type().
New function filter_by_route_id().
New function filter_by_sf().
New function filter_by_shape_id().
New function filter_by_stop_id().
New function filter_by_trip_id().
New function get_parent_station().
New function remove_duplicates().
New parameters to read_gtfs(): fields, skip and encoding. The warnings parameter was flagged as deprecated.
New parameters to write_gtfs(): files, standard_only and as_dir. They substitute the previously existent optional and extra, which were flagged as deprecated. The warnings parameter was flagged as deprecated too.
New vignette exploring the filtering functions.

get_trip_speed() and set_trip_speed() examples and tests now only run if {lwgeom} is installed. {lwgeom} is an {sf} “soft” dependency required by these functions, and is listed in Suggests. However, package checks would fail not so gracefully if it wasn’t installed, which is now fixed.
Fixed a bug in which the crs passed to get_trip_geometry() would be assigned to the result without actually reprojecting it.
Changed the behaviour of get_trip_geometry() to not raise an error when the ‘file’ parameter is left untouched and the GTFS object doesn’t contain either the shapes or the stop_times table. Closes #29.
Fixed a bug that would cause merge_gtfs() to create objects that inherited only from dt_gtfs (ignoring gtfs and list).
Fixed a bug in which get_trip_speed() returned NA speeds if the specified trip_id was listed in trips, but not in stop_times.
Adjusted set_trip_speed() to stop raising a max()-related warning when none of the specified trip_ids exists.

Some utility functions previously provided by {gtfs2gps} will now be exported by {gtfstools}. Huge thanks to the whole {gtfs2gps} crew (Rafael Pereira @rafapereirabr, Pedro Andrade @pedro-andrade-inpe and João Bazzo @Joaobazzo)!
The package now imports {gtfsio}, and many functions now heavily rely on it, such as read_gtfs() and write_gtfs().
Internal function string_to_seconds() now runs much faster thanks to Mark Padgham (@mpadge).
get_trip_geometry() now runs much faster due to data.table-related optimizations.

Functions no longer validate GTFS objects on usage. validate_gtfs() will be flagged as deprecated as well, since I plan to heavily change its usability and outputs in future versions.
write_gtfs() parameters went through major changes - the optional and extra params were flagged as deprecated and substituted by the more general files and standard_only.

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