code: def convert_deps_to_pip(deps, project=None, r=True, include_index=True):
      Converts a Pipfile-formatted dependency to a pip-formatted one."""
      from .vendor.requirementslib.models.requirements import Requirement
  
      dependencies = []
      for dep_name, dep in deps.items():
          if project:
              project.clear_pipfile_cache()
          indexes = getattr(project, "pipfile_sources", []) if project is not None else []
          new_dep = Requirement.from_pipfile(dep_name, dep)
          if new_dep.index:
              include_index = True
          req = new_dep.as_line(sources=indexes if include_index else None).strip()
          dependencies.append(req)
      if not r:
          return dependencies
  
      # Write requirements.txt to tmp directory.
      from .vendor.vistir.path import create_tracked_tempfile
      f = create_tracked_tempfile(suffix="-requirements.txt", delete=False)
      f.write("\n".join(dependencies).encode("utf-8"))
      f.close()
      return f.name
docs: Converts a Pipfile-formatted dependency to a pip-formatted one.