Unity Editor Script to generate new Component and Add it to the selected object

gistfile1.txt

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

// Reference
// http://answers.unity3d.com/questions/12599/editor-script-need-to-create-class-script-automati.html
// http://answers.unity3d.com/questions/1007004/generate-script-in-editor-script-and-gettype-retur.html

public class CreateNewTest {
	const string NAME_CLASS_LABEL = "NewSimpleTDDTestCase";


	[MenuItem("Assets/Create/New Custom Script")]
	static void Create()
	{
		GameObject selected = Selection.activeObject as GameObject;
		if (selected == null )
		{
			Debug.Log("Selected object not Valid");
			return;
		}
		Debug.Log("Selected object=" + selected.name);

		// Filename
		string className = selected.name.Replace(" ","");
	
		string filename = "Assets/"+className+".cs";

		// 
		if( File.Exists(filename) ){
			Debug.Log("Test Script already exists");
   		return;
		}

		string content = GetScriptContent(className);

		// 
		using (StreamWriter outfile = new StreamWriter(filename))
		{
			outfile.WriteLine(content);
		}

		ImportAsset(className, filename);
	}

	static void ImportAsset(string className, string scriptPath)
	{
		// @BMayne’s amazing suggestion, set the name for later reference.
		EditorPrefs.SetString (NAME_CLASS_LABEL, className);

		// You probably don’t need to do both of these, but I’m just making sure.
		// (Experiment with the ones you might or might not need)
		AssetDatabase.ImportAsset (scriptPath);
		AssetDatabase.Refresh (ImportAssetOptions.ForceUpdate );
	}


[UnityEditor.Callbacks.DidReloadScripts]
	private static void ScriptReloaded() 
	{
		Debug.Log("ScriptReloaded!!");
		// If the key doesn’t exist, don’t bother, as we’re not generating stuff.
		if (!EditorPrefs.HasKey (NAME_CLASS_LABEL))
		{
			Debug.Log("ScriptReloaded: No key found");
			return;
		}

		// If they key does exist and the object doesn’t, it’s just a left over key.
		string name = EditorPrefs.GetString (NAME_CLASS_LABEL);

		Debug.Log("ScriptReloaded: className=" + name);

		GameObject go = GameObject.Find( name );

		if (go == null)
		{
			Debug.Log("ScriptReloaded: No game object found");
			return;
		}
		// Get the new type from the reloaded assembly!
		// (It won’t work without assembly specification, because this
		//  is an editor script, so the default assembly is “Assembly-CSharp-editor”)
		Type type = Type.GetType (name + ",Assembly-CSharp");
		Debug.Log("ScriptReloaded: type=" + type);
		go.AddComponent( type );

		//Delete the key because we don’t need it anymore!
		EditorPrefs.DeleteKey(NAME_CLASS_LABEL);
	}


	static string GetScriptContent(string name)
	{
		string template = GetScriptTemplate();

		string content = template.Replace("##name##", name);

		return content;
	}

	static string GetScriptTemplate()
	{
		return 
@"using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class ##name## : MonoBehaviour {

	 // TODO Script Template content 
		
	}
}