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Unity3d property drawer for automatically making enums flags into mask fields in the inspector.

Usage: Put the .cs files somewhere in your project. When you have an enum field you want to turn into a mask field in the inspector, add the EnumFlag attribute over the field. Eg:

[EnumFlag]
MyCustomEnum thisEnum;
// This lets you give the field a custom name in the inspector.
[EnumFlag("Custom Inspector Name")]
MyCustomEnum anotherEnum;

EnumFlagAttribute.cs

using UnityEngine;

public class EnumFlagAttribute : PropertyAttribute
{
	public string enumName;

	public EnumFlagAttribute() {}

	public EnumFlagAttribute(string name)
	{
		enumName = name;
	}
}

EnumFlagDrawer.cs

using System;
using System.Reflection;
using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(EnumFlagAttribute))]
public class EnumFlagDrawer : PropertyDrawer {
	public override void OnGUI (Rect position, SerializedProperty property, GUIContent label)
	{
    		EnumFlagAttribute flagSettings = (EnumFlagAttribute)attribute;
    		Enum targetEnum = GetBaseProperty<Enum> (property);
    		EditorGUI.BeginProperty (position, label, property);
    		Enum enumNew;
    		string propName = flagSettings.enumName;
    		if (string.IsNullOrEmpty (propName)) {
        		enumNew = EditorGUI.EnumMaskField (position, label, targetEnum);
    		} else {
        		enumNew = EditorGUI.EnumMaskField (position, propName, targetEnum); 
    		}
    		property.intValue = (int)Convert.ChangeType (enumNew, targetEnum.GetType ());
    		EditorGUI.EndProperty ();
	}


	static T GetBaseProperty<T>(SerializedProperty prop)
	{
		// Separate the steps it takes to get to this property
		string[] separatedPaths = prop.propertyPath.Split('.');
		
		// Go down to the root of this serialized property
		System.Object reflectionTarget = prop.serializedObject.targetObject as object;
		// Walk down the path to get the target object
		foreach (var path in separatedPaths)
		{
			FieldInfo fieldInfo = reflectionTarget.GetType().GetField(path);
			reflectionTarget = fieldInfo.GetValue(reflectionTarget);
		}
		return (T) reflectionTarget;
	}
}