app-pieces/bin/pieces

#!/bin/sh

print_help() {
  echo "$0 - pieces and operate on things"
  echo
  echo "Usage: pieces [command] [args]"
  echo "    pieces add [address]  - Add a thing's address to the pieces list"
  echo "    pieces clear          - Clear pieces list"
  echo "    pieces link           - Link two addresses"
  echo "    pieces ls             - List current piecess"
  echo "    pieces ls-print0      - List current piecess, separated by NUL chars"
  echo "    pieces remove         - Remove a given URN from the pieces list"
  echo "    pieces -h             - Print this help message"
  echo
  echo "You must specify a command."
  exit 1
}

if [ $# -lt 1 ] || [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
  print_help
fi

subprog="pieces-$1"

# Make sure that the command we've been given exists:
command -v "$subprog" >/dev/null 2>&1 || {
  echo "pieces: '$1' is not a pieces command.  See 'pieces -h'."
  exit 1
}

shift
exec "$subprog" "$@"