Parsing the encode result is broken in CLI

[shabnomnom]

When attempting to save the result from the endcode flag, the outputted result is not the same as the outputted result from the GeoJSON node script. There is an issue with the parser of the input or output.

Steps to reproduce:

1. polyline.json file includes:

[[-114.05130386352539,51.112359778280194],[-114.05130386352539,51.11947193091105],[-114.05611038208008,51.12324308281078][-114.06538009643555,51.126152046793365], [-114.0736198425293,51.12916855668462]]

2. using : cat polyline.json | ./bin/polyline.bin.js --encode > encoded-poly.txt:

result in encoded-poly.txt:

"??????????_}hQ?????_qo]?~flW?_seK?~|hQ?_}hQ?_qo]?~reK?~|hQ?_seK?~|hQ?_}hQ?~reK?_{rc@?????~flW???????_ibE?_ibE?_seK?_glW?~reK???_ibE?~zrc@?_{rc@?~nyo@?_ibE?_oyo@?~po]?????????????????????????????????????_}hQ?????_qo]?~flW?_seK?~|hQ?_}hQ?_qo]?~reK?~|hQ?_seK?~|hQ?_}hQ?~reK?_{rc@?????~flW???????_oyo@?~po]?_}hQ?~zrc@?_oyo@?~zrc@?~|hQ?_y|u@?~nyo@???~hbE?_qo]?????????????????????????????????????_}hQ?????_qo]?_ibE?~po]???~hbE?_}hQ?_qo]?~zrc@?~reK?_oyo@?~nyo@???_oyo@?????~flW?????_ibE?_ibE?~hbE?_seK?~hbE?~|hQ?_oyo@?~zrc@?_{rc@?~dvi@?~hbE?_evi@?_ibE?????????????????????????????????????_}hQ?????_{rc@?~hbE?~reK?_qo]?~nyo@???_y|u@?~|hQ?~reK?~hbE?_seK?????????~flW?????_ibE?_glW?~po]?_glW?~|hQ?~reK?_glW?_seK?_ibE?_seK?~zrc@???_}hQ?~hbE?????????????????????????????????????_}hQ?????_evi@?~flW?_}hQ?~po]?_oyo@?~hbE?~flW?~reK?_}hQ?~|hQ?_evi@?~zrc@?????~flW?????_ibE?_evi@?~nyo@?_qo]?_seK?~|hQ???_ibE???_seK?~flW?_seK?~flW???????"

Compare to the result from the GeoJSON node script:

const polyline = require('@mapbox/polyline')
undefined
polyline.fromGeoJSON({ "type": "Feature",
... "geometry": {
..... "type": "LineString",
..... "coordinates": [[-114.05130386352539,51.112359778280194], [-114.05130386352539,51.11947193091105],[-114.05611038208008,51.12324308281078], [-114.06538009643555,51.126152046793365],[-114.0736198425293,51.12916855668462] ]
..... },
... "properties": {}
... });
'g{}vHrsbwTmk@?qV]eQ|x@{Qnr@'

[roblabs]

The array of [lat,lng] points is being passed into encode as a rawString. The proper fix would be to add JSON.parse() to what is passed to encode in the CLI wrapper file. Its unlikely that this fix would break other users. (requesting @ Mapbox team to review)

---

Change return polyline.encode(...)

return polyline.encode(rawString, p);

to

return polyline.encode(JSON.parse(rawString), p);

See:
https://github.com/mapbox/polyline/blob/4852d2468195f71cd240b50e48b87a8f5f4ce143/bin/polyline.bin.js#L75,L85

---

Testing with these commands encodes a polyline, but returns extra quotes:

# returns extra quotes due to an extra stringify
#   "w{qeFj`wjVwAzJJ?"
cat points.unencoded.txt | ./node_modules/.bin/polyline --encode

Where points.unencoded.txt contains:

[[37.77996,-122.51158],[37.7804,-122.51348],[37.78034,-122.51348]]