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| import os | |
| from distutils import log | |
| import itertools | |
| 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): | |
| 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))) | |
| 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 | |