Show Usages of MonoBehaviours

ShowUsages.cs

using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
using System;


/// <summary>
/// Add the 'Show Usages' menu item which lists all usages of a script in prefabs.
/// This is useful to check if a script is still used anywhere.
/// </summary>
public static class ShowScriptUsages  {	
	[MenuItem("Assets/Show Usages",true)]
	private static bool ShowUsagesCheck()
	{
		if (Selection.assetGUIDs.Length != 1){
			return false;
		}
		
		return GetScriptType() != null;
	}
	[MenuItem("Assets/Show Usages")]
	private static void ShowUsages()
	{
		var type = GetScriptType();
		
		foreach (var go in ShowAllAssets(type)){
			var goTransform = go.transform;
			var rootGO = PrefabUtility.FindPrefabRoot(go);
			var rootTransform = rootGO.transform;
			string pathInPrefab = string.Empty;
			
			if (rootTransform != goTransform) {
				pathInPrefab = ":" + GetPathInPrefab("",goTransform,rootTransform).TrimEnd('/');
			}
			
			Debug.Log(AssetDatabase.GetAssetPath(rootTransform)+pathInPrefab,rootGO);
		}
	}


    private static IEnumerable<GameObject> ShowAllAssets(System.Type type)
    {
		foreach (var assetPath in AssetDatabase.GetAllAssetPaths()){
			var prefab = AssetDatabase.LoadAssetAtPath<GameObject>(assetPath);
			if (prefab != null){
				foreach (var comp in  prefab.GetComponentsInChildren(type,true)){
					yield return comp.gameObject;
				}
			}
		}
    }
	
	private static Type GetScriptType(){
		string guid = Selection.assetGUIDs[0];

        return AssetDatabase.LoadAssetAtPath<MonoScript>(AssetDatabase.GUIDToAssetPath(guid)).GetClass();
	}
	
	private static string GetPathInPrefab(string path, Transform go, Transform root)
    {
		
		string childPath = path + root.name+ "/";
        if (root == go){
			return childPath;
		}
		foreach (Transform child in root) {
			
			string subPath = GetPathInPrefab(childPath, go, child);
			if (subPath!=null){
				return subPath;
			}
		}
		return null;
    }
}