Usage:
    extract-gtfs-shapes <path-to-shapes-file> <output-directory>
Options:
    --concurrency    -c  How many files to write in parallel. Default: 32
    --quiet          -q  Don't log stats.
Examples:
    extract-gtfs-shapes -c 50 data/gtfs/shapes.txt shapes
    cat data/gtfs/shapes.txt | extract-gtfs-shapes - shapes
Notes:
    extract-gtfs-shapes needs the GTFS shapes.txt to be sorted by
    1. shape_id, alphanumerically
    2. shape_pt_sequence, numerically
    You can use Miller (https://miller.readthedocs.io/) and the
    Unix tool sponge to do this:
    mlr --csv sort -f shape_id -n shape_pt_sequence \
      shapes.txt | sponge shapes.txt