Unity3D - Script Viewer

using UnityEngine;
using UnityEditor;
using System.Collections;


public class ScriptViewerWindow : EditorWindow {

    public TextAsset script;
    public Vector2 scroll = Vector2.zero;

    [MenuItem("Window/Script Viewer")]
    static void Init() {
        CreateInstance<ScriptViewerWindow>().Show(true);
    }

    void OnGUI() {
        script = EditorGUILayout.ObjectField(script, typeof(TextAsset)) as TextAsset;

        if(script) {
            scroll = EditorGUILayout.BeginScrollView(scroll);
            GUILayout.TextArea(script.text);
            EditorGUILayout.EndScrollView();
        }
    }
}