#!/usr/bin/env sh
set -o errexit

mount_dir="/mnt/fhnw-share"
dest_dir="$HOME/documents/fhnw/ad"
excluded_files=".DS_Store|Thumbs.db"
sync_dirs=""

display_help() {
  echo "Usage: $0 [option...] " >&2
  echo
  echo "   -m,   mount directory for the ad (must already exist) [default: $mount_dir]"
  echo "   -d,   root destination directory [default: $dest_dir]"
  echo "   -e,   list of excluded files (pipe separated) [default: $excluded_files]"
  echo "   -s,   list of ad directories, relative to the mount directory that will be synced (pipe separated)"
  echo "   -h,   display this help and exit"
  echo
}

parse_args() {
  while getopts ":hm:d:e:s:" opt; do
    case $opt in
    h)
      display_help
      exit 0
      ;;
    m)
      mount_dir=$OPTARG
      ;;
    d)
      dest_dir=$OPTARG
      ;;
    e)
      excluded_files=$OPTARG
      ;;
    s)
      sync_dirs=$OPTARG
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      display_help
      exit 1
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      display_help
      exit 1
      ;;
    esac
  done
}

cleanup() {
  rm "$exclude_file"
}
trap cleanup EXIT

create_exclude_file() {
  exclude_file="$(mktemp)"

  oldIFS=$IFS
  IFS='|'
  for ex in $excluded_files; do
    echo "$ex" >>"$exclude_file"
  done
  IFS=$oldIFS
}

sync_ad() {
  echo "syncing ad..."
  oldIFS=$IFS
  IFS='|'
  for s in $sync_dirs; do
    rsync -avz --exclude-from "$exclude_file" --progress "$mount_dir/$s" "$dest_dir"
  done
  IFS=$oldIFS
}

parse_args "$@"
create_exclude_file
sync_ad