#! /bin/bash

cache() (
   path() {
      echo "$CACHE/$(echo "$*" | base64)"
   }
   get() {
      local path="$(path "$*")"
      if ! [ -f "$path" ]; then
         return 1
      fi
      if wc -c "$path" | grep -q '^[ ]*0[ ]*$'; then
         return 1
      fi
      local created="$(date -r "$path" +%s)"
      local now="$(date +%s)"
      if ((now-created > CACHE_DURATION)); then
         return 1
      fi
      cat "$path"
   }
   put() {
      local path="$(path "$*")"
      tee "$path"
   }
   "$@"
)