#!/usr/bin/sh -e
# Fortune implementation in awk

usage()
{
  echo "Usage: fortune [OPTIONS]
a simple POSIX sh/awk implementation of fortune

  -h, --help                 show this help message
  -l, --list                 list cookie files installed to /usr/share/fortune/
  -f \$FILE, --file \$FILE     specify full path to cookie file
  -c \$FILE, --cookie \$FILE   specify path to cookie file relative
                             to /usr/share/fortune/
"
}

FILE="$(find /usr/share/fortune/ -type f -not -name '*.dat')"
while [ "$1" != "" ]; do
  case $1 in
    -h | --help)
      usage
      exit
      ;;
    -f | --file)
      FILE=$2
      ;;
    -c | --cookie)
      FILE=/usr/share/fortune/$2
      ;;
    -l | --list)
      ls -1 /usr/share/fortune
      exit
      ;;
    *)
      echo "ERROR: unknown parameter \"$2\""
      usage
      exit 1
      ;;
  esac
  shift 2
done

awk 'BEGIN {
  f++
}

$1 == "%" {
  f++
}

{
  sub("%", "")
  fortunes[f] = fortunes[f] (length(fortunes[f])?"\n":"") $0
}

END {
  "date +%N" | getline time
  srand(time)
  print fortunes[int(rand() * f-2) + 2]
}' $FILE