docs: def patch_egg_info(force_hg_version=False):
  	"""
  	A hack to replace egg_info.tagged_version with a wrapped version
  	that will use the mercurial version if indicated.
  
  	`force_hg_version` is used for hgtools itself.
  	"""
  	from setuptools.command.egg_info import egg_info
  	from pkg_resources import safe_version
  	import functools
  	orig_ver = egg_info.tagged_version
  
  	@functools.wraps(orig_ver)
  	def tagged_version(self):
  		vcs_param = (
  			getattr(self.distribution, 'use_vcs_version', False)
  			or getattr(self.distribution, 'use_hg_version', False)
  		)
  		using_hg_version = force_hg_version or vcs_param
  		if force_hg_version:
  			# disable patched `tagged_version` to avoid affecting
  			#  subsequent installs in the same interpreter instance.
  			egg_info.tagged_version = orig_ver
  		if using_hg_version:
  			result = safe_version(self.distribution.get_version())
  		else:
  			result = orig_ver(self)
  		self.tag_build = result
  		return result
  	egg_info.tagged_version = tagged_version