前言：之前总会遇到一些资源需要复制一份到别的目录去修改的需求，但是每次操作不是要Show in Explorer再执行复制就是要Ctrl+D然后拖拽再改名，所以写了这个脚本。

功能：

• 复制文件
• 粘贴文件
• 剪贴文件
• 项目内地址自动解析为复制

逻辑：

复制时把所有已选择文件转为unity路径数组记录，使用AssetDatabase.CopyAsset()和AssetDatabase.MoveAsset()来实现剪切和粘贴，也就只识别以Assets/目录开头的路径文件或文件夹
并且在ClipboardListener类里做了剪贴板实时监听功能，会把从任何地方复制的满足unity路径的string自动放到粘贴里。

源码：

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

public class CopyPasteTool : Editor
{
    public static List<string> copyPaths;
    static bool isCut = false;

    [MenuItem("Assets/剪切")]
    static void Cut()
    {
        Copy();
        isCut = true;
    }
    [MenuItem("Assets/复制")]
    static void Copy()
    {
        if (copyPaths == null)
        {
            copyPaths = new List<string>();
        }
        string[] assetGUIDs = Selection.assetGUIDs;
        copyPaths.Clear();
        for (int i = 0; i < assetGUIDs.Length; i++)
        {
            copyPaths.Add(AssetDatabase.GUIDToAssetPath(assetGUIDs[i]));
        }
        isCut = false;
    }
    [MenuItem("Assets/粘贴")]
    static void Paste()
    {
        for (int i = 0; i < copyPaths.Count; i++)
        {
            string soureName = Path.GetFileName(copyPaths[i]);
            string targetPath = AssetDatabase.GUIDToAssetPath(Selection.assetGUIDs[0]);

            if (Path.HasExtension(targetPath))
            {
                targetPath = Path.GetDirectoryName(targetPath) + @"\" + soureName;
            }
            else
            {
                targetPath += @"\" + soureName;
            }

            if (File.Exists(targetPath))
            {
                int temp = EditorUtility.DisplayDialogComplex("文件重复警告", $"当前目录存在 {soureName}，是否替换", "替换", "取消", "重新命名");
                switch (temp)
                {
                    case 0:
                        break;
                    case 1:
                        return;
                    case 2:
                        string soureNameExtension = Path.GetFileNameWithoutExtension(copyPaths[i]);
                        string soureExtension = Path.GetExtension(copyPaths[i]);
                        targetPath = Path.GetDirectoryName(targetPath) + @"\" + soureNameExtension + "_" + soureExtension;
                        break;
                }
            }
            if (isCut)
            {
                AssetDatabase.MoveAsset(copyPaths[i], targetPath);
                isCut = false;
                copyPaths.Clear();
            }
            else
            {
                AssetDatabase.CopyAsset(copyPaths[i], targetPath);
            }

        }
    }
    [MenuItem("Assets/粘贴", validate = true)]
    static bool PasteCheck()
    {
        if (copyPaths == null || copyPaths.Count == 0)
        {
            return false;
        }
        return true;
    }
}


[InitializeOnLoad]
public class ClipboardListener : CopyPasteTool
{
    static ClipboardListener()
    {
        EditorApplication.update += OnEditorUpdate;
    }

    static string previousClipBoardValue;
    private static void OnEditorUpdate()
    {
        if (GUIUtility.systemCopyBuffer != previousClipBoardValue)
        {
            previousClipBoardValue = GUIUtility.systemCopyBuffer;
            if (File.Exists(previousClipBoardValue) && previousClipBoardValue.StartsWith("Assets"))
            {
                if (copyPaths == null)
                {
                    copyPaths = new List<string>();
                }
                copyPaths.Clear();
                copyPaths.Add(previousClipBoardValue);
            }
        }
    }
}