write_devcontainer.py

import os, json
os.makedirs('.devcontainer', exist_ok=True)
cfg = {
    "name": "Headroom Eval + Whale",
    "image": "mcr.microsoft.com/devcontainers/python:3.11",
    "features": {
        "ghcr.io/devcontainers/features/git:1": {},
        "ghcr.io/devcontainers/features/nix:1": {}
    },
    "postCreateCommand": "pip install -r requirements.txt && curl -fsSL https://whale.setup | sh 2>/dev/null || echo 'whale: install manually'",
    "customizations": {
        "vscode": {
            "extensions": ["ms-python.python", "mkhl.direnv"]
        }
    },
    "forwardPorts": [7860],
    "portsAttributes": {"7860": {"label": "Gradio", "onAutoForward": "openPreview"}}
}
json.dump(cfg, open('.devcontainer/devcontainer.json','w'), indent=2)
print('.devcontainer + whale + nix written')