nixpkgs/pkgs/development/python-modules/recursive-pth-loader/sitecustomize.py

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2012-07-22 00:16:59 +00:00
"""Recursively load pth files in site-packages of sys.path
- iterate over sys.path
- check for pth in dirs that end in site-packages
- ignore import statements in pth files
- add dirs listed in pth files right after current sys.path element,
they will be processed in next iteration
"""
import os
import site
import sys
for path_idx, sitedir in enumerate(sys.path):
# ignore non-site-packages
if not sitedir.endswith('site-packages'):
continue
# find pth files
try:
names = os.listdir(sitedir)
except os.error:
continue
dotpth = os.extsep + "pth"
pths = [name for name in names if name.endswith(dotpth)]
for pth in pths:
fullname = os.path.join(sitedir, pth)
try:
f = open(fullname, "rU")
except IOError:
continue
with f:
for n, line in enumerate(f):
if line.startswith("#"):
continue
if line.startswith(("import ", "import\t")):
continue
line = line.rstrip()
dir, dircase = site.makepath(sitedir, line)
if not dircase in sys.path:
sys.path.insert(path_idx+1, dir)