#!/usr/bin/env bash

set -euo pipefail

# @describe Generates random words of specified length from dictionary
# @meta require-tools grep,tr,shuf
# @flag -1 one word per line
# @option -l --length=8, Length of each generated word (in regexp format)
# @option -n --words=1 Number of words to generate
# @arg pattern regular expression pattern
# @env WORDS_FILE=/usr/share/dict/words Path to dictionary file

_list_words() {
  iconv -t ASCII//TRANSLIT "$WORDS_FILE" | # Fix accents (like ö, ü, é)
    grep -xE "[a-zA-Z]{${argc_length?}}" |
    tr '[:upper:]' '[:lower:]' |
    grep -E "${argc_pattern:-}" |
    shuf -n "${argc_words?}"
}

main() {
  mapfile -t words < <(_list_words)

  if [ -n "${argc_1:-}" ]; then
    printf "%s\n" "${words[@]}"
  else
    printf "%s\n" "${words[*]}"
  fi
}

eval "$(argc --argc-eval "$0" "$@")"