#!/bin/bash

set -e
set -u

usage() {
  echo "Usage: $0 [-d <dictionary] [count]"
}

dictionary=american-english

while getopts "hd:" OPTION; do
  case "$OPTION" in
    h)
      usage
      exit 0
    ;;
    d)
      dictionary="$OPTARG"
    ;;
    *)
      usage >&2
      exit 1
  esac
done
shift $(($OPTIND - 1))

count=${1:-6}

if ! [[ $dictionary == *"/"* ]]; then
  dictionary=/usr/share/dict/"$dictionary"
fi

if ! [ -e "$dictionary" ]; then
  echo >&2 "$dictionary does not exist"
  exit 1
fi

egrep '^[a-z]{1,6}$' "$dictionary" | shuf | head -n "$count" | tr '\n' '-' | sed -e 's/-$//'
echo