fungus/Assets/Fungus/Scripts/Commands/MenuShuffle.cs

// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)

using UnityEngine;
using UnityEngine.Serialization;
using System.Collections.Generic;

namespace Fungus
{
    /// <summary>
    /// Shuffle the order of the items in a Fungus Menu
    /// </summary>
    [CommandInfo("Narrative", 
                 "Menu Shuffle", 
		"Shuffle the order of the items in a Fungus Menu")]
    [AddComponentMenu("")]
    [ExecuteInEditMode]
    public class MenuShuffle : Command
    {
		public enum Mode
		{
			Every,
			Once
		}
		[SerializeField]
		[Tooltip("Determines if the order is shuffled everytime this command is it (Every) or if it is consistent when returned to but random (Once)")]
		protected Mode shuffleMode = Mode.Once;

		private int seed = -1;

        public override void OnEnter()
        {
            var menuDialog = MenuDialog.GetMenuDialog();

			//if we shuffle every time or we haven't shuffled yet
			if(shuffleMode == Mode.Every || seed == -1)
			{
				seed = Random.Range(0,1000000);
			}

            if (menuDialog != null)
            {
				menuDialog.Shuffle(new System.Random(seed));
            }

            Continue();
        }

        public override string GetSummary()
        {
            return shuffleMode.ToString();
        }

        public override Color GetButtonColor()
        {
            return new Color32(184, 210, 235, 255);
        }
    }
}