Unity 3d : Get Selected Folder in Project Window

gistfile1.cs

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.IO;

public static class UnityUtil
{
	public static string GetSelectedPathOrFallback()
	{
		string path = "Assets";
		
		foreach (UnityEngine.Object obj in Selection.GetFiltered(typeof(UnityEngine.Object), SelectionMode.Assets))
		{
			path = AssetDatabase.GetAssetPath(obj);
			if ( !string.IsNullOrEmpty(path) && File.Exists(path) ) 
			{
				path = Path.GetDirectoryName(path);
				break;
			}
		}
		return path;
	}
}

That will only work if a file is selected. Here's an alternative that supports folders too:

public static string GetCurrentAssetDirectory()
{
    foreach (var obj in Selection.GetFiltered<Object>(SelectionMode.Assets))
    {
        var path = AssetDatabase.GetAssetPath(obj);
        if (string.IsNullOrEmpty(path))
            continue;

        if (System.IO.Directory.Exists(path))
            return path;
        else if (System.IO.File.Exists(path))
            return System.IO.Path.GetDirectoryName(path);
    }

    return "Assets";
}

and any way to open this folder like EditorGUIUtility.PingObject?? I want fast jump to this folder on editor (because I'm searching file and want jump to this folder)

For extensive answer, please see my stackoverflow answer.
https://stackoverflow.com/questions/32318320/getting-path-of-right-click-in-unity-3d-editor/66381542#66381542

Stable cross-platform solution, supports folders and files. Default path is Application.dataPath

public static string GetProjectWindowFolder()
{
	string projectPath = new DirectoryInfo(Application.dataPath).Parent.FullName;
	string objectProjectPath = AssetDatabase.GetAssetPath(Selection.activeObject);
	string objectAbsolutePath = string.IsNullOrEmpty(objectProjectPath) ? Application.dataPath : $"{projectPath}/{objectProjectPath}";
	string objectCorrectAbsolutePath = objectAbsolutePath.Replace('/', Path.DirectorySeparatorChar).Replace('\\', Path.DirectorySeparatorChar);
	string folderAbsolutePath = File.Exists(objectCorrectAbsolutePath) ? Path.GetDirectoryName(objectCorrectAbsolutePath) : objectCorrectAbsolutePath;
	return Path.GetRelativePath(projectPath, folderAbsolutePath);
}