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import os
from distutils import log
from setuptools.extern.six.moves import map
class Installer:
def install_namespaces(self):
nsp = self._get_all_ns_packages()
if not nsp:
return
filename, ext = os.path.splitext(self.target)
filename += '-nspkg.pth'
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)
_nspkg_tmpl = (
"import sys, types, os",
"pep420 = sys.version_info > (3, 3)",
"p = os.path.join(sys._getframe(1).f_locals['sitedir'], *%(pth)r)",
"ie = os.path.exists(os.path.join(p,'__init__.py'))",
"m = not ie and not pep420 and "
"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"
@classmethod
def _gen_nspkg_line(cls, pkg):
# ensure pkg is not a unicode string under Python 2.7
pkg = str(pkg)
pth = tuple(pkg.split('.'))
tmpl_lines = cls._nspkg_tmpl
parent, sep, child = pkg.rpartition('.')
if parent:
tmpl_lines += cls._nspkg_tmpl_multi
return ';'.join(tmpl_lines) % locals() + '\n'
def _get_all_ns_packages(self):
"""Return sorted list of all package namespaces"""
nsp = set()
for pkg in self.distribution.namespace_packages or []:
pkg = pkg.split('.')
while pkg:
nsp.add('.'.join(pkg))
pkg.pop()
return sorted(nsp)
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