daily

#!/usr/bin/env bash

# shellcheck disable=SC2209
test "$(uname -s)" = Darwin && dcmd=gdate || dcmd=date
type "$dcmd" >/dev/null 2>&1 || { echo "FATAL: GNU Date not installed" >&2; exit 1; }

fmt=%s
qual=day
while getopts f opt ; do
  case $opt in
    f) fmt=%Y%m%d; qual=hour ;;
    ?|*) exit 2 ;;
  esac
done
shift $((OPTIND-1))

logfile="$HOME/.logs/last_$1_run.log"
d=$($dcmd +$fmt)
y=$($dcmd --date="1 $qual ago" +$fmt)

function x {
  if test ! -e "$logfile"; then
    mkdir -p "$HOME/.logs"
    "$@" && echo "$y" > "$logfile"
  elif test "$(cat "$logfile")" -lt "$y"; then
    "$@" && echo "$d" > "$logfile"
  fi
}

if type "$1" >/dev/null 2>&1; then
  x "$@"
else
  echo "$1 is not available." >&2
  exit 1
fi