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import os from distutils import log import itertools from setuptools.extern.six.moves import map flatten = itertools.chain.from_iterable class Installer: nspkg_ext = '-nspkg.pth' def install_namespaces(self): nsp = self._get_all_ns_packages() if not nsp: return filename, ext = os.path.splitext(self._get_target()) filename += self.nspkg_ext self.outputs.append(filename) log.info("Installing %s", filename) lines = map(self._gen_nspkg_line, nsp) if self.dry_run: # always generate the lines, even in dry run list(lines) return with open(filename, 'wt') as f: f.writelines(lines) def uninstall_namespaces(self): filename, ext = os.path.splitext(self._get_target()) filename += self.nspkg_ext if not os.path.exists(filename): return log.info("Removing %s", filename) os.remove(filename) def _get_target(self): return self.target _nspkg_tmpl = ( "import sys, types, os", "has_mfs = sys.version_info > (3, 5)", "p = os.path.join(%(root)s, *%(pth)r)", "importlib = has_mfs and __import__('importlib.util')", "has_mfs and __import__('importlib.machinery')", "m = has_mfs and " "sys.modules.setdefault(%(pkg)r, " "importlib.util.module_from_spec(" "importlib.machinery.PathFinder.find_spec(%(pkg)r, " "[os.path.dirname(p)])))", "m = m or " "sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))", "mp = (m or []) and m.__dict__.setdefault('__path__',[])", "(p not in mp) and mp.append(p)", ) "lines for the namespace installer" _nspkg_tmpl_multi = ( 'm and setattr(sys.modules[%(parent)r], %(child)r, m)', ) "additional line(s) when a parent package is indicated" def _get_root(self): return "sys._getframe(1).f_locals['sitedir']" def _gen_nspkg_line(self, pkg): # ensure pkg is not a unicode string under Python 2.7 pkg = str(pkg) pth = tuple(pkg.split('.')) root = self._get_root() tmpl_lines = self._nspkg_tmpl parent, sep, child = pkg.rpartition('.') if parent: tmpl_lines += self._nspkg_tmpl_multi return ';'.join(tmpl_lines) % locals() + '\n' def _get_all_ns_packages(self): """Return sorted list of all package namespaces""" pkgs = self.distribution.namespace_packages or [] return sorted(flatten(map(self._pkg_names, pkgs))) @staticmethod def _pkg_names(pkg): """ Given a namespace package, yield the components of that package. >>> names = Installer._pkg_names('a.b.c') >>> set(names) == set(['a', 'a.b', 'a.b.c']) True """ parts = pkg.split('.') while parts: yield '.'.join(parts) parts.pop() class DevelopInstaller(Installer): def _get_root(self): return repr(str(self.egg_path)) def _get_target(self): return self.egg_link