ScriptTemplateModifier.cs

using UnityEditor;
using UnityEngine;

namespace Utils {

	public class ScriptTemplateModifier : UnityEditor.AssetModificationProcessor {

		private const string SCRIPT_LOCATION = "Assets/Scripts/";
		private const string PROJECT_NAME = "#PROJECT_NAME#";
		private const string FILE_PATH = "#FILE_PATH#";

		#region CORE REPLACEMENT METHODS

		public static void OnWillCreateAsset(string relativePath) {
			relativePath = relativePath.Replace(".meta", "");

			int index = relativePath.LastIndexOf('.');
			if (index < 0)
				return;

			string extension = relativePath.Substring(index);
			if (extension != ".cs" && extension != ".js" && extension != ".boo")
				return;

			index = Application.dataPath.LastIndexOf("Assets");
			string fullPath = Application.dataPath.Substring(0, index) + relativePath;
			if (!System.IO.File.Exists(fullPath))
				return;

			ReplaceKeywords(fullPath, relativePath);

			AssetDatabase.Refresh();
		}

		private static void ReplaceKeywords(string fullPath, string relativePath) {
			string file = System.IO.File.ReadAllText(fullPath);

			file = file.Replace(PROJECT_NAME, GetProjectName());
			file = file.Replace(FILE_PATH, GetPathNamespace(relativePath));

			System.IO.File.WriteAllText(fullPath, file);
		}

		#endregion

		#region INFO METHODS

		private static string GetProjectName() {
			return Application.productName;
		}

		// ie: If the relative path is: "Assets/Scripts/Gameplay/Tiles/CustomTile.cs"
		// It will return: "Gameplay.Tiles"
		private static string GetPathNamespace(string relativePath) {
			string pathNamespace = relativePath.Remove(0, SCRIPT_LOCATION.Length);

			int index = pathNamespace.LastIndexOf('/');
			if (index < 0)
				return "";

			pathNamespace = pathNamespace.Substring(0, pathNamespace.LastIndexOf('/'));
			pathNamespace = pathNamespace.Replace('/', '.');

			return "." + pathNamespace;
		}

		#endregion

	}

}