#!/bin/sh

: ${PGAL:="ghcr.io/polettix/pgal/pgal:latest"}

main() {
   local dir="$PWD" # sensible default

   local last="$(get_last "$@")"
   if [ -n "$last" ] && [ "X${last%"${last#?}"}X" != 'X-X' ] ; then
      dir="${last%?}"
      local args="$(popped_array "$@")"
      eval "set -- $args"
   fi

   # set default parameters if we have none left
   [ $# -gt 0 ] || set -- -cruN

   docker run --rm -itv "$(readlink -f "$dir"):/mnt" "$PGAL" "$@"
}

get_last() {
   [ $# -gt 0 ] || return 0
   [ $# -eq 1 ] || shift "$(( $# - 1 ))"
   printf '%sX' "$1"
   return 0
}

popped_array() {
   local array='' e
   while [ $# -gt 1 ] ; do
      e="$(printf '%s\n' "$1" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' /")"
      array="$array$e "
      shift
   done
   printf '%s' "$array"
}

main "$@"