Unity script to enable building for all platforms using command line

BuildManager.cs

using UnityEditor;

/*
Methods to execute:
- RunMacOS
- RunWin
- RunWebGL

Command line arguments:
- output      : build output path
- scene       : scene to include into build
- development : same as Unity Editor flag: "Development Build"
- debug       : same as Unity Editor flag: "Script Debugging"

Usage example on macOS: 
/Applications/Unity/Unity.app/Contents/MacOS/Unity \
    -batchmode \
    -nographics \
    -silent-crashes \
    -logFile build.log \
    -projectPath ./UnitySrc \
        -executeMethod "BuildManager.RunMacOS" \
        -output MyCoolGame.app \
        -scene "Assets/Main.unity" \
        -development \
        -debug \
    -quit
*/
class BuildManager
{
	public const string KEY_OUTPUT      = "-output";
	public const string KEY_SCENE       = "-scene";
	public const string KEY_DEVELOPMENT = "-development";
	public const string KEY_DEBUG       = "-debug";

	public static void RunMacOS() { Run(BuildTarget.StandaloneOSXUniversal); }
	public static void RunWin()   { Run(BuildTarget.StandaloneWindows64); }
	public static void RunWebGL() { Run(BuildTarget.WebGL); }

	private static void Run(BuildTarget buildTarget)
	{
		string sceneActive = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;
		string[] scenes = new string[0];

		string output = null;
		BuildOptions buildOptions = BuildOptions.None;

		string[] args = System.Environment.GetCommandLineArgs();
		for (int i = 1; i < args.Length; i++)
		{
			if (args[i - 1].Equals(KEY_OUTPUT)) output = args[i];
			if (args[i - 1].Equals(KEY_SCENE))  scenes = new string[] { args[i] };

			if (args[i].Equals(KEY_DEVELOPMENT)) buildOptions |= BuildOptions.Development;
			if (args[i].Equals(KEY_DEBUG))       buildOptions |= BuildOptions.AllowDebugging;
		}

		BuildPipeline.BuildPlayer(scenes, output, buildTarget, buildOptions);
	}
}