Utility editor script for displaying a dialog message when it is imported. Useful for adding messages to asset store packages for instance. Rather than just showing a dialogue, this could also be used as a platform for running an actual package installer

PackageInfo.cs

using UnityEngine;
using UnityEditor;


[InitializeOnLoad]
public class PackageInfo
{
	const string kTitle = "Notice", kMessage = "This package is the prettiest of them all.", kButton = "Ok", kPackageIdentifier = "AwesomePackage";


	static PackageInfo ()
	{
		if (!InfoShown)
		{
			InfoShown = true;

			EditorUtility.DisplayDialog (kTitle, kMessage, kButton);
		}
	}


	static bool InfoShown
	{
		get
		{
			return EditorPrefs.GetInt ("PackageInfo-" + kPackageIdentifier + "-InfoShown", 0) != 0;
		}
		set
		{
			EditorPrefs.SetInt ("PackageInfo-" + kPackageIdentifier + "-InfoShown", value ? 1 : 0);
		}
	}
}