シェルスクリプトで往年のじゃんけんマシーンを作る

#!/bin/zsh

signs=(✊ ✋ ✌)

# generage cpu sign
# 1: rock✊
# 2: paper✋
# 3: scissors✌
generate_cpu_sign() {
  cpu=$((RANDOM % 3 + 1))
}

# read player sign
read_player_sign() {
  while true; do
    echo -n "r(ock)/p(aper)/s(cissors): "
    read -k 1 you
    echo
    case $you in
      "r") you=1; break;;
      "p") you=2; break;;
      "s") you=3; break;;
    esac
  done
}

# judge win/lose/draw
judge() {
  case "$(($you - $cpu))" in
    "0") echo "draw";;
    "1" | "-2") echo "win";;
    *) echo "lose";;
  esac
}

# print both signs
print_both_signs() {
  if [ $aiko -eq 0 ]; then
    echo "しょ！👱${signs[$you]} ${signs[$cpu]}🤖"
  else
    echo "ぽん！👱${signs[$you]} ${signs[$cpu]}🤖"
  fi
}

while true; do
  # start session
  aiko=1
  generate_cpu_sign
  echo "じゃ〜んけ〜ん・・・"

  while true; do
    read_player_sign

    print_both_signs

    case $(judge) in
      "draw")
        sleep 1
        aiko=0
        generate_cpu_sign
        echo "あ〜いこ〜で・・・"
        ;;
      "win")
        sleep 1
        echo "フィーバー！🎉"
        break
        ;;
      "lose")
        sleep 0.25
        echo "ズコー"
        break
        ;;
    esac
  done

  echo
  sleep 1
done

-k [ num ]
       Read only one (or num) characters.  All are assigned to the first name, without word splitting.  This flag is ignored when -q is
       present.  Input is read from the terminal unless one of -u or -p is present.  This option may also be used within zle widgets.

       Note that despite the mnemonic `key' this option does read full characters, which may consist of multiple bytes if the option MULTIBYTE
       is set.

hoge() {
  echo hoge
}

echo "hoge ret: $(hoge)"