Add input support for shapefile file format

[e-n-f]

No description provided.

[e-n-f]

Many malformed URL errors from mbview after

tippecanoe -z2 -f -o yes.mbtiles ne_110m_admin_0_countries.shp

blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:38 Uncaught URIError: URI malformed
    at decodeURIComponent (<anonymous>)
    at Uint8Array.toString (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:38)
    at Pbf.readString (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:41)
    at readValueMessage (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:70)
    at readLayer (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:70)
    at Pbf.readFields (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:41)
    at new VectorTileLayer (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:70)
    at readTile (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:66)
    at Pbf.readFields (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:41)
    at new VectorTile (blob:http://localhost:3000/5a1c4245-ff70-421f-b118-d80f273b8a0f:66)

Not sure what I'm doing wrong yet.

[jenningsanderson]

@ericfischer, not sure if helpful or not, but: I get this error exactly when I use tippecanoe to tile big geojsons of geo-tagged tweets. I'm usually generating big geojson files with Python and need to be sure all my values get HTML entity escaped before they are written to geojson for tippecanoe. Using this: urllib.parse.quote_plus() on all my values fixes this error. A totally different domain, but perhaps something in the shapefile (maybe a separator character?) is being encoded in the values and is causing this error? Good luck!

[e-n-f]

Ah, thank you @jenningsanderson! In this case it's probably because the Natural Earth shapefiles are in ISO-8859-1, not UTF-8, and I'm not checking for it properly!

I thought Tippecanoe was enforcing UTF-8 in GeoJSON, but maybe I messed something up there. If you see this again with GeoJSON, can you please let me know? Thanks!