codekingpro/portable-devtools

1import os2from distutils import log3import itertools4 5from .compat import py396 7 8flatten = itertools.chain.from_iterable9 10 11class Installer:12    nspkg_ext = '-nspkg.pth'13 14    def install_namespaces(self):15        nsp = self._get_all_ns_packages()16        if not nsp:17            return18        filename = self._get_nspkg_file()19        self.outputs.append(filename)20        log.info("Installing %s", filename)21        lines = map(self._gen_nspkg_line, nsp)22 23        if self.dry_run:24            # always generate the lines, even in dry run25            list(lines)26            return27 28        with open(filename, 'wt', encoding=py39.LOCALE_ENCODING) as f:29            # Requires encoding="locale" instead of "utf-8" (python/cpython#77102).30            f.writelines(lines)31 32    def uninstall_namespaces(self):33        filename = self._get_nspkg_file()34        if not os.path.exists(filename):35            return36        log.info("Removing %s", filename)37        os.remove(filename)38 39    def _get_nspkg_file(self):40        filename, _ = os.path.splitext(self._get_target())41        return filename + self.nspkg_ext42 43    def _get_target(self):44        return self.target45 46    _nspkg_tmpl = (47        "import sys, types, os",48        "p = os.path.join(%(root)s, *%(pth)r)",49        "importlib = __import__('importlib.util')",50        "__import__('importlib.machinery')",51        (52            "m = "53            "sys.modules.setdefault(%(pkg)r, "54            "importlib.util.module_from_spec("55            "importlib.machinery.PathFinder.find_spec(%(pkg)r, "56            "[os.path.dirname(p)])))"57        ),58        ("m = m or " "sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))"),59        "mp = (m or []) and m.__dict__.setdefault('__path__',[])",60        "(p not in mp) and mp.append(p)",61    )62    "lines for the namespace installer"63 64    _nspkg_tmpl_multi = ('m and setattr(sys.modules[%(parent)r], %(child)r, m)',)65    "additional line(s) when a parent package is indicated"66 67    def _get_root(self):68        return "sys._getframe(1).f_locals['sitedir']"69 70    def _gen_nspkg_line(self, pkg):71        pth = tuple(pkg.split('.'))72        root = self._get_root()73        tmpl_lines = self._nspkg_tmpl74        parent, sep, child = pkg.rpartition('.')75        if parent:76            tmpl_lines += self._nspkg_tmpl_multi77        return ';'.join(tmpl_lines) % locals() + '\n'78 79    def _get_all_ns_packages(self):80        """Return sorted list of all package namespaces"""81        pkgs = self.distribution.namespace_packages or []82        return sorted(set(flatten(map(self._pkg_names, pkgs))))83 84    @staticmethod85    def _pkg_names(pkg):86        """87        Given a namespace package, yield the components of that88        package.89 90        >>> names = Installer._pkg_names('a.b.c')91        >>> set(names) == set(['a', 'a.b', 'a.b.c'])92        True93        """94        parts = pkg.split('.')95        while parts:96            yield '.'.join(parts)97            parts.pop()98 99 100class DevelopInstaller(Installer):101    def _get_root(self):102        return repr(str(self.egg_path))103 104    def _get_target(self):105        return self.egg_link106