cache_get: use curl to fetch if cache is not available locally

cache_get.sh

#!/usr/bin/env bash

cache_get() {
    local cache="./data/$1.json"
    test -f "$cache" && find "$cache" -type f -mtime +$((1/24)) -exec rm -v {} + >&2 # clear cache >1 hr
    test -f "$cache" || curl  --silent "$2" --create-dirs --output "$cache"
    cat "$cache"
}