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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)))
@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