project-detection

name	project-detection
description	Detects project type, package manager, and monorepo structure. Returns correct commands for test/build/lint/dev. Run at project initialization and cache results in state. Use before running any build/test commands.

Project Detection

Detects project configuration and provides standardized commands. Run once at init, cache in state file.

Usage

Run the detection script from the project root:

./marathon-ralph/skills/project-detection/scripts/detect.sh /path/to/project

Returns JSON:

{
  "language": "node",
  "packageManager": "bun",
  "monorepo": {
    "type": "turbo",
    "workspaces": ["apps/web", "apps/api", "packages/shared"]
  },
  "commands": {
    "install": "bun install",
    "dev": "bun run dev",
    "build": "bun run build",
    "test": "bun run test",
    "testWorkspace": "bun run --filter={workspace} test",
    "lint": "bun run lint",
    "typecheck": "bun run check-types"
  }
}

Caching Results

After detection, store in marathon state file under project key:

{
  "project": {
    "language": "node",
    "packageManager": "bun",
    "monorepo": { "type": "turbo", "workspaces": [...] },
    "commands": { ... },
    "detectedAt": "2024-01-03T12:00:00Z"
  }
}

Using Cached Commands

When running commands, always check state first:

1. Read project.commands from state
2. If not present, run detection script
3. Use the appropriate command from the cache

For Monorepos

When tests/builds need to target a specific workspace:

# Use testWorkspace with the workspace name
bun run --filter=web test

# Or for all workspaces
turbo run test

Command Selection Priority

1. Use cached command from state
2. If no cache, run detection
3. If detection fails, fall back to reference patterns

Detection Logic

Package Manager Detection (by lock file)

Lock File	Package Manager	Install	Run
bun.lock or bun.lockb	bun	bun install	bun run
pnpm-lock.yaml	pnpm	pnpm install	pnpm run
yarn.lock	yarn	yarn install	yarn
package-lock.json	npm	npm install	npm run

Monorepo Detection

Config File	Monorepo Type
turbo.json	Turborepo
nx.json	Nx
lerna.json	Lerna
pnpm-workspace.yaml	pnpm workspaces
package.json with workspaces	npm/yarn workspaces

Language Detection

Indicator	Language
package.json	Node.js
pyproject.toml, setup.py	Python
go.mod	Go
Cargo.toml	Rust
build.gradle, pom.xml	Java

Python Project Commands

For Python projects:

Tool	Install	Run Script	Test
poetry	poetry install	poetry run {script}	poetry run pytest
poetry+poe	poetry install	poe {task}	poe test
pip + venv	pip install -r requirements.txt	python -m {module}	pytest
uv	uv pip install -r requirements.txt	uv run {script}	uv run pytest
pipenv	pipenv install	pipenv run {script}	pipenv run pytest

Note: If [tool.poe.tasks] exists in pyproject.toml, poe commands are preferred.

Reference Files

• node.md - Node.js patterns and commands
• python.md - Python patterns and commands
• monorepo.md - Monorepo-specific patterns