UnityConstantsGenerator - Util - Generates constants from Layers Tags Axes

UnityConstantsGenerator.cs

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

public static class UnityConstantsGenerator
{
    [MenuItem("Edit/Generate UnityConstants.cs")]
    public static void Generate()
    {
        // Try to find an existing file in the project called "UnityConstants.cs"
        string filePath = string.Empty;
        foreach (var file in Directory.GetFiles(Application.dataPath, "*.cs", SearchOption.AllDirectories)) {
            if (Path.GetFileNameWithoutExtension(file) == "UnityConstants") {
                filePath = file;
                break;
            }
        }

        // If no such file exists already, use the save panel to get a folder in which the file will be placed.
        if (string.IsNullOrEmpty(filePath)) {
            string directory = EditorUtility.OpenFolderPanel("Choose location for UnityConstants.cs", Application.dataPath, "");

            // Canceled choose? Do nothing.
            if (string.IsNullOrEmpty(directory)) {
                return;
            }

            filePath = Path.Combine(directory, "UnityConstants.cs");
        }

        // Write out our file
        using (var writer = new StreamWriter(filePath)) {
            writer.WriteLine("// This file is auto-generated. Modifications are not saved.");
            writer.WriteLine();
            writer.WriteLine("namespace UnityConstants");
            writer.WriteLine("{");

            // Write out the tags
            writer.WriteLine("    public static class Tags");
            writer.WriteLine("    {");
            foreach (var tag in UnityEditorInternal.InternalEditorUtility.tags) {
                writer.WriteLine("        /// <summary>");
                writer.WriteLine("        /// Name of tag '{0}'.", tag);
                writer.WriteLine("        /// </summary>");
                writer.WriteLine("        public const string {0} = \"{1}\";", MakeSafeForCode(tag), tag);
            }
            writer.WriteLine("    }");
            writer.WriteLine();

            // Write out sorting layers
            writer.WriteLine("    public static class SortingLayers");
            writer.WriteLine("    {");
            foreach (var layer in SortingLayer.layers) {
                writer.WriteLine("        /// <summary>");
                writer.WriteLine("        /// ID of sorting layer '{0}'.", layer.name);
                writer.WriteLine("        /// </summary>");
                writer.WriteLine("        public const int {0} = {1};", MakeSafeForCode(layer.name), layer.id);
            }
            writer.WriteLine("    }");
            writer.WriteLine();

            // Write out layers
            writer.WriteLine("    public static class Layers");
            writer.WriteLine("    {");
            for (int i = 0; i < 32; i++) {
                string layer = UnityEditorInternal.InternalEditorUtility.GetLayerName(i);
                if (!string.IsNullOrEmpty(layer)) {
                    writer.WriteLine("        /// <summary>");
                    writer.WriteLine("        /// Index of layer '{0}'.", layer);
                    writer.WriteLine("        /// </summary>");
                    writer.WriteLine("        public const int {0} = {1};", MakeSafeForCode(layer), i);
                }
            }
            writer.WriteLine();
            for (int i = 0; i < 32; i++) {
                string layer = UnityEditorInternal.InternalEditorUtility.GetLayerName(i);
                if (!string.IsNullOrEmpty(layer)) {
                    writer.WriteLine("        /// <summary>");
                    writer.WriteLine("        /// Bitmask of layer '{0}'.", layer);
                    writer.WriteLine("        /// </summary>");
                    writer.WriteLine("        public const int {0}Mask = 1 << {1};", MakeSafeForCode(layer), i);
                }
            }
            writer.WriteLine("    }");
            writer.WriteLine();

            // Write out scenes
            writer.WriteLine("    public static class Scenes");
            writer.WriteLine("    {");
            int sceneIndex = 0;
            foreach (var scene in EditorBuildSettings.scenes) {
                if (!scene.enabled) {
                    continue;
                }

                var sceneName = Path.GetFileNameWithoutExtension(scene.path);

                writer.WriteLine("        /// <summary>");
                writer.WriteLine("        /// ID of scene '{0}'.", sceneName);
                writer.WriteLine("        /// </summary>");
                writer.WriteLine("        public const int {0} = {1};", MakeSafeForCode(sceneName), sceneIndex);

                sceneIndex++;
            }
            writer.WriteLine("    }");
            writer.WriteLine();

            // Write out Input axes
            writer.WriteLine("    public static class Axes");
            writer.WriteLine("    {");
            var axes = new HashSet<string>();
            var inputManagerProp = new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/InputManager.asset")[0]);
            foreach (SerializedProperty axe in inputManagerProp.FindProperty("m_Axes")) {
                var name = axe.FindPropertyRelative("m_Name").stringValue;
                var variableName = MakeSafeForCode(name);
                if (!axes.Contains(variableName)) {
                    writer.WriteLine("        /// <summary>");
                    writer.WriteLine("        /// Input axis '{0}'.", name);
                    writer.WriteLine("        /// </summary>");
                    writer.WriteLine("        public const string {0} = \"{1}\";", variableName, name);
                    axes.Add(variableName);
                }
            }
            writer.WriteLine("    }");

            // End of namespace UnityConstants
            writer.WriteLine("}");
            writer.WriteLine();
        }

        // Refresh
        AssetDatabase.Refresh();
    }

    private static string MakeSafeForCode(string str)
    {
        str = Regex.Replace(str, "[^a-zA-Z0-9_]", "_", RegexOptions.None);
        if (char.IsDigit(str[0])) {
            str = "_" + str;
        }
        return str;
    }
}

Not mine, keeping it as its handy here. Creds to the creator. All hail.