text: """The setup script."""
  
  from pathlib import Path
  
  from setuptools import setup
  
  
  def parse_reqs(filepath: str) -> list:
      """
      Parse a file path containing requirements and return a list of requirements.
  
      Will properly follow ``-r`` and ``--requirements`` links like ``pip``. This
      means nested requirements will be returned as one list.
  
      Other ``pip``-specific lines are excluded.
  
      Args:
          filepath: The path to the requirements file
  
      Returns:
          All the requirements as a list.
      """
      path = Path(filepath)
      reqstr = path.read_text()
      reqs = []
      for line in reqstr.splitlines():
          line = line.strip()
          if line == "":
              continue
          elif not line or line.startswith("#"):
              # comments are lines that start with # only
              continue
          elif line.startswith("-r") or line.startswith("--requirement"):
              _, new_filename = line.split()
              new_file_path = path.parent / new_filename
              reqs.extend(parse_reqs(new_file_path))
          elif line.startswith("-f") or line.startswith("-i") or line.startswith("--"):
              continue
          elif line.startswith("-Z") or line.startswith("--always-unzip"):
              continue
          else:
              reqs.append(line)
      return reqs
  
  
  requirements = parse_reqs("requirements.txt")
  dev_requirements = parse_reqs("requirements/dev.txt")
  test_requirements = parse_reqs("requirements/test.txt")
  
  setup(
      install_requires=requirements,
      tests_require=test_requirements,
      extras_require={"dev": dev_requirements, "test": test_requirements},
  )
  