ScriptableObject asset spawner for Unity

ScriptableObjectSpawner.cs

// Adds a menu item for easy creation of your ScriptableObject types
// Usage: Right click in project view -> Create -> ScriptableObject... -> Select your type 
// It will land in the root of your assets folder with the same name as your class
// Freya Holmér - webmaster@acegikmo.com

using UnityEngine;
using UnityEditor;
using System.Reflection;
using System.Linq;
using System.IO;

public class ScriptableObjectSpawner : EditorWindow {
	
	// Config
	const bool CLOSE_AFTER_SPAWNING = true;
	const bool SELECT_AFTER_SPAWN = true;
	
	// Variables
	string[] m_TypeNames;
	string[] m_AssemblyNames;
	System.Type[] m_Types;
	GUIStyle m_LeftAlignedButtonStyle;
	Vector2 m_ScrollViewPos;

	// Window spawning
	[MenuItem( "Assets/Create/ScriptableObject..." )]
	static void Init() {
		ScriptableObjectSpawner window = (ScriptableObjectSpawner)EditorWindow.GetWindow( typeof( ScriptableObjectSpawner ), true );
		window.title = "Select a type...";
		window.Center();
	}

	// Center on screen
	void Center(){
		Rect scPos = this.position;
		scPos.center = new Vector2(Screen.currentResolution.width, Screen.currentResolution.height) / 2;
		this.position = scPos;
	}
	
	// Interface
	void OnGUI() {
		if( m_TypeNames == null || m_Types == null || m_LeftAlignedButtonStyle == null )
			Reload();
		m_ScrollViewPos = EditorGUILayout.BeginScrollView( m_ScrollViewPos );
		float halfWidth = ( Screen.width / 2 ) - 13;
		for( int i = 0; i < m_Types.Length; i++ ) {
			GUILayout.BeginHorizontal();
			if( GUILayout.Button( m_TypeNames[i], m_LeftAlignedButtonStyle, GUILayout.Width( halfWidth ) ) ) {
				ScriptableObject so = ScriptableObject.CreateInstance( m_Types[i] );
				AssetDatabase.CreateAsset( so, GetUniqueAssetPath( m_Types[i] ) );
				if( SELECT_AFTER_SPAWN )
					Selection.objects = new Object[] { so };
				EditorGUIUtility.PingObject( so );
				if( CLOSE_AFTER_SPAWNING )
					Close();
			}
			
			GUILayout.Label( m_AssemblyNames[i], GUILayout.Width( halfWidth ) );
			GUILayout.EndHorizontal();
		}
		EditorGUILayout.EndScrollView();
	}
	
	// Reload data and recache arrays
	void Reload() {
		Assembly[] asms = System.AppDomain.CurrentDomain.GetAssemblies().Where( x => x.FullName.StartsWith( "Assembly-CSharp" ) ).ToArray();
		m_Types = asms.SelectMany( x => x.GetTypes().Where( type => type.IsSubclassOf( typeof( ScriptableObject ) ) && !type.IsSubclassOf( typeof( Editor ) ) && !type.IsSubclassOf( typeof( EditorWindow ) ) ) ).OrderBy( x => x.Name ).ToArray();
		m_TypeNames = m_Types.Select( x => x.Name ).ToArray();
		m_AssemblyNames = m_Types.Select( x => x.Assembly.FullName.Split( ',' )[0] ).ToArray();
		m_LeftAlignedButtonStyle = new GUIStyle( GUI.skin.button );
		m_LeftAlignedButtonStyle.alignment = TextAnchor.MiddleLeft;
	}
	
	// Used to make sure names are incremental, eg. MyObject, MyObject_2, MyObject_3
	string GetUniqueAssetPath( System.Type type ) {
		string typeName = type.Name;
		string folder = GetAssetFolder();
		string path = folder + typeName + ".asset";
		if( AssetDatabase.LoadAssetAtPath( path, type ) == null )
			return path;
		int i = 2;
		do {
			path = folder + typeName + "_" + i + ".asset";
			i++;
		} while( AssetDatabase.LoadAssetAtPath( path, type ) != null );
		return path;
	}

	// Get the folder to create the asset in
	string GetAssetFolder(){
		Object[] selection = Selection.GetFiltered(typeof(UnityEngine.Object), SelectionMode.Assets);
		if( selection != null && selection.Length > 0 ){ 				// If any assets are selected
			for(int i=0;i<selection.Length;i++){ 						// Search for a folder
				string path = AssetDatabase.GetAssetPath(selection[i]);
				if(Directory.Exists(Application.dataPath.Substring(0,Application.dataPath.Length-6) + path)){
					return path + "/";
				}
			}
			return Path.GetDirectoryName( AssetDatabase.GetAssetPath(selection[0])) + "/";	// If no folder was found, grab the first object's directory
		}
		return "Assets/";
	}
	
}