#!/bin/bash

# Downloads zoneinfo files if not already present
# echos 2 lines,
# - the directory with the zoneinfo files
# - the names of the zoneinfo files to be parsed

CACHE_DIR=${CACHE_DIR:-~/.cache/calp}
TAR=tzdata-latest.tar.gz
TZ_SRC="https://www.iana.org/time-zones/repository/$TAR"

mkdir -p $CACHE_DIR
cd $CACHE_DIR

test -d "tzdata" || {
	test -f "/tmp/$TAR" || env --chdir=/tmp curl -sOL $TZ_SRC
	mkdir tzdata
	tar xf "/tmp/$TAR" -C tzdata
}
cd "tzdata"


tzpath=$(pwd)

size=$(stat -c "%s" Makefile)

cat >> Makefile << EOF
.PHONY: print-tdata
print-tdata:
	@echo \$(TDATA_TO_CHECK)
EOF
files=$(make print-tdata)

truncate -cs $size Makefile

echo $tzpath
echo $files