Add support for macOS (Darwin) in launch.py

    xformers = '--xformers' in sys.argv

    ngrok = '--ngrok' in sys.argv

    if platform.system() == 'Darwin':

        os.environ["PYTORCH_ENABLE_MPS_FALLBACK"] = "1"

        torch_command = os.environ.get('TORCH_COMMAND', "pip install torch==1.12.1 torchvision==0.13.1")

        k_diffusion_repo = os.environ.get('K_DIFFUSION_REPO', 'https://github.com/brkirch/k-diffusion.git')

        k_diffusion_commit_hash = os.environ.get('K_DIFFUSION_COMMIT_HASH', "51c9778f269cedb55a4d88c79c0246d35bdadb71")

        if os.environ.get('COMMANDLINE_ARGS') == None:

            if '--use-cpu' in sys.argv:

                idx = sys.argv.index('--use-cpu')

                if idx < len(sys.argv) and sys.argv[idx+1][0] != '-':

                    sys.argv.insert(idx+1, 'interrogate')

            else:

                sys.argv += ['--use-cpu', 'interrogate']

            sys.argv.append('--no-half')

    try:

        commit = run(f"{git} rev-parse HEAD").strip()

    except Exception:

    if not is_installed("torch") or not is_installed("torchvision"):

        run(f'"{python}" -m {torch_command}', "Installing torch and torchvision", "Couldn't install torch")

    if not skip_torch_cuda_test:

    if not skip_torch_cuda_test and platform.system() != 'Darwin':

        run_python("import torch; assert torch.cuda.is_available(), 'Torch is not able to use GPU; add --skip-torch-cuda-test to COMMANDLINE_ARGS variable to disable this check'")

    if not is_installed("gfpgan"):

    if not is_installed("pyngrok") and ngrok:

        run_pip("install pyngrok", "ngrok")

    if platform.system() == 'Darwin' and not is_installed("psutil"):

        run_pip("install psutil", "psutil")

    os.makedirs(dir_repos, exist_ok=True)

    git_clone(stable_diffusion_repo, repo_dir('stable-diffusion-stability-ai'), "Stable Diffusion", stable_diffusion_commit_hash)

#clone_dir="stable-diffusion-webui"

# Commandline arguments for webui.py, for example: export COMMANDLINE_ARGS="--medvram --opt-split-attention"

export COMMANDLINE_ARGS=""

#export COMMANDLINE_ARGS=""

# python3 executable

#python_cmd="python3"