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107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
import itertools
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import os
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from .compat import py312
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from distutils import log
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flatten = itertools.chain.from_iterable
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class Installer:
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nspkg_ext = '-nspkg.pth'
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def install_namespaces(self) -> None:
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nsp = self._get_all_ns_packages()
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if not nsp:
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return
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filename = self._get_nspkg_file()
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self.outputs.append(filename)
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log.info("Installing %s", filename)
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lines = map(self._gen_nspkg_line, nsp)
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if self.dry_run:
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# always generate the lines, even in dry run
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list(lines)
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return
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with open(filename, 'wt', encoding=py312.PTH_ENCODING) as f:
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# Python<3.13 requires encoding="locale" instead of "utf-8"
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# See: python/cpython#77102
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f.writelines(lines)
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def uninstall_namespaces(self) -> None:
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filename = self._get_nspkg_file()
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if not os.path.exists(filename):
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return
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log.info("Removing %s", filename)
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os.remove(filename)
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def _get_nspkg_file(self):
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filename, _ = os.path.splitext(self._get_target())
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return filename + self.nspkg_ext
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def _get_target(self):
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return self.target
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_nspkg_tmpl = (
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"import sys, types, os",
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"p = os.path.join(%(root)s, *%(pth)r)",
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"importlib = __import__('importlib.util')",
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"__import__('importlib.machinery')",
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(
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"m = "
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"sys.modules.setdefault(%(pkg)r, "
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"importlib.util.module_from_spec("
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"importlib.machinery.PathFinder.find_spec(%(pkg)r, "
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"[os.path.dirname(p)])))"
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),
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("m = m or sys.modules.setdefault(%(pkg)r, types.ModuleType(%(pkg)r))"),
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"mp = (m or []) and m.__dict__.setdefault('__path__',[])",
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"(p not in mp) and mp.append(p)",
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)
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"lines for the namespace installer"
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_nspkg_tmpl_multi = ('m and setattr(sys.modules[%(parent)r], %(child)r, m)',)
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"additional line(s) when a parent package is indicated"
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def _get_root(self):
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return "sys._getframe(1).f_locals['sitedir']"
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def _gen_nspkg_line(self, pkg):
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pth = tuple(pkg.split('.'))
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root = self._get_root()
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tmpl_lines = self._nspkg_tmpl
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parent, sep, child = pkg.rpartition('.')
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if parent:
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tmpl_lines += self._nspkg_tmpl_multi
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return ';'.join(tmpl_lines) % locals() + '\n'
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def _get_all_ns_packages(self):
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"""Return sorted list of all package namespaces"""
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pkgs = self.distribution.namespace_packages or []
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return sorted(set(flatten(map(self._pkg_names, pkgs))))
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@staticmethod
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def _pkg_names(pkg):
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"""
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Given a namespace package, yield the components of that
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package.
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>>> names = Installer._pkg_names('a.b.c')
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>>> set(names) == set(['a', 'a.b', 'a.b.c'])
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True
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"""
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parts = pkg.split('.')
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while parts:
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yield '.'.join(parts)
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parts.pop()
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class DevelopInstaller(Installer):
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def _get_root(self):
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return repr(str(self.egg_path))
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def _get_target(self):
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return self.egg_link
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