stack/packages/quality-rails/src/detect.ts

import { constants } from 'node:fs';
import { access } from 'node:fs/promises';
import { join } from 'node:path';

import type { ProjectKind } from './types.js';

async function fileExists(filePath: string): Promise<boolean> {
  try {
    await access(filePath, constants.F_OK);
    return true;
  } catch {
    return false;
  }
}

export async function detectProjectKind(projectPath: string): Promise<ProjectKind> {
  if (await fileExists(join(projectPath, 'package.json'))) {
    return 'node';
  }

  if (await fileExists(join(projectPath, 'pyproject.toml'))) {
    return 'python';
  }

  if (await fileExists(join(projectPath, 'Cargo.toml'))) {
    return 'rust';
  }

  return 'unknown';
}