functions.sh

#!/bin/bash

. "$HOME/.cargo/env"

function process() {
	INPUT=$1
	PREFIX=$2
	LUMP_ARGS=$3
	FILE_TIMESTAMP=$(osmium fileinfo --get header.option.timestamp "$INPUT")
	TMP="tmp.${PREFIX}.$(date -u +%F.%s)"

	if [[ $LUMP_ARGS =~ "min-length-m" ]] ; then
		MIN_LENGTH_ARG=""
	else
		MIN_LENGTH_ARG="--min-length-m 100000"
	fi


	SECONDS=0
	osm-lump-ways -v -i "$INPUT" -o "${TMP}.geojson" $LUMP_ARGS $MIN_LENGTH_ARG --save-as-linestrings
	echo "GeoJSON created successfully (in ${SECONDS}sec $(units "${SECONDS}sec" time)). uncompressed size: $(ls -lh "${TMP}.geojson" | cut -d" " -f5)"
	(
		echo "Starting tippecanoe..."
		SECONDS=0
		timeout 5h tippecanoe \
			-n "OSM River Topologies" \
			-N "Generated on $(date -I) from OSM data from ${FILE_TIMESTAMP:-OSMIUM_HEADER_MISSING} with $(osm-lump-ways --version) and argument $LUMP_ARGS" \
			-A "© OpenStreetMap. Open Data under ODbL. https://osm.org/copyright" \
			--single-precision \
			--simplification=8 \
			--drop-densest-as-needed \
			-y length_m -y root_nodeid_120 \
			-l waterway \
			--coalesce --reorder \
			--gamma 2 \
			--no-progress-indicator \
			-o "${TMP}.pmtiles" "${TMP}.geojson"
		mv "${TMP}.geojson" "./${PREFIX}.geojson"
		gzip -f -9 "./${PREFIX}.geojson" &
		echo "PMTiles created successfully (in ${SECONDS}sec $(units "${SECONDS}sec" time)). size: $(ls -lh "${TMP}.pmtiles" | cut -d" " -f5)"
		mv "${TMP}.pmtiles" "./docs/data/${PREFIX}.pmtiles"
		echo "GeoJSON & PMTiles created successfully."
	) &
}