#!/bin/sh

self="$(dirname -- "$0")"
old=
new=

while getopts ':o:n:h' opt "$@"; do
  case "$opt" in
    h)
      command cat <<\END
Usage: setup [-o old] -n new
END
      exit
    ;;
    o)
      if [ -n "$old" ]; then
        >&2 echo "[z4h/setup] error: duplicate option: -$opt"
        exit 1
      fi
      old="$OPTARG"
    ;;
    n)
      if [ -n "$new" ]; then
        >&2 echo "[z4h/setup] error: duplicate option: -$opt"
        exit 1
      fi
      new="$OPTARG"
    ;;
    \?) >&2 echo "[z4h/setup] error: invalid option: -$OPTARG"           ; exit 1;;
    :)  >&2 echo "[z4h/setup] error: missing required argument: -$OPTARG"; exit 1;;
    *)  >&2 echo "[z4h/setup] internal error: unhandled option: -$opt"   ; exit 1;;
  esac
done

if [ "$OPTIND" -le $# ]; then
  >&2 echo "[z4h/setup] error: unexpected positional argument"
  exit 1
fi

if [ -z "$new" ]; then
  >&2 echo "[z4h/setup] error: missing required option: -n"
  exit 1
fi

command find "$self" -name '*.zwc' -exec rm -f -- '{}' '+'               || exit

command mkdir -p -- "$new"/bin "$new"/fn "$new"/cache/ohmyzsh "$new"/tmp || exit
if [ ! -L "$new"/z4h.zsh ]; then
  command cp -f -- "$self"/../z4h.zsh "$new"/                            || exit
fi
if [ ! -e "$new"/cache/last-update-ts ]; then
  echo -n >"$new"/cache/last-update-ts                                   || exit
fi

if [ -n "$old" -a -d "$old"/stickycache ]; then
  command rm -rf -- "$new"/stickycache                                   || exit
  command cp -r -- "$old"/stickycache "$new"/stickycache                 || exit
else
  command mkdir -p -- "$new"/stickycache                                 || exit
fi