Initial commit

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

LICENSE

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+MIT License
+
+Copyright (c) 2021 magicjar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# com.agraris.core
+ Agraris tools core components.

Runtime/Agraris.Tools.Core.asmdef

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+{
+	"name": "Agraris.Tools.Core"
+}

Runtime/Singletons/PresistentSingleton.cs

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+using UnityEngine;
+
+namespace Agraris.Tools.Core
+{
+    /// <summary>
+    /// Persistent singleton.
+    /// </summary>
+    public class PersistentSingleton<T> : MonoBehaviour where T : Component
+    {
+        protected static T _instance;
+
+        /// <summary>
+        /// The singleton instance.
+        /// </summary>
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    GameObject obj = new GameObject();
+                    _instance = obj.AddComponent<T>();
+                }
+                return _instance;
+            }
+        }
+
+        /// <summary>
+        /// On awake, we check if there's already a copy of the object in the scene. If there's one, we destroy it.
+        /// </summary>
+        protected virtual void Awake()
+        {
+            if (_instance != null)
+            {
+                //there is already an instance:
+                Destroy(gameObject);
+                return;
+            }
+
+            //If I am the first instance, make me immortal
+            _instance = this as T;
+            DontDestroyOnLoad(transform.gameObject);
+        }
+    }
+}

Runtime/Singletons/Singleton.cs

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+using UnityEngine;
+
+namespace Agraris.Tools.Core
+{
+    /// <summary>
+    /// Singleton pattern.
+    /// </summary>
+    public class Singleton<T> : MonoBehaviour where T : Component
+    {
+        protected static T _instance;
+
+        /// <summary>
+        /// The singleton instance.
+        /// </summary>
+        public static T Instance
+        {
+            get
+            {
+                if (_instance == null)
+                {
+                    GameObject obj = new GameObject();
+                    _instance = obj.AddComponent<T>();
+                }
+                return _instance;
+            }
+        }
+
+        /// <summary>
+        /// On awake, we check if there's already a copy of the object in the scene. If there's one, we destroy it.
+        /// </summary>
+        protected virtual void Awake()
+        {
+            if (_instance != null)
+            {
+                //there is already an instance:
+                Destroy(gameObject);
+                return;
+            }
+
+            _instance = this as T;
+        }
+    }
+}

package.json

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+{
+    "name": "com.agraris.core",
+    "version": "1.0.0",
+    "displayName": "Agraris Core",
+    "description": "Agraris tools core components.",
+    "unity": "2020.3",
+    "keywords": [
+        "utility",
+        "tool",
+        "unity",
+        "singleton"
+    ],
+    "homepage": "https://agraris.github.io/",
+    "bugs": {
+        "url": "https://github.com//issues",
+        "email": "[email protected]"
+    },
+    "repository": {
+        "type": "git",
+        "url": ""
+    },
+    "license": "MIT",
+    "author": {
+        "name": "Agraris Entertainment"
+    }
+}