Adust the as_table tag to render a pick link if appropriate
The templates are adjusted to pass on a 'reference' value, which
is the url_name of the view from which the entity should be picked.
The as_table (and related) function(s) construct and then pass on
this argument and enable takes_contex so that we have access to the
context of the enclosing template.
We only extract ReferenceProperties that end with '_link_id' since
that is how all RP's are currently named. It is not possible to
create a field with the same name as the RP, as GAE will try to
interpret it's contents as the key of an entity before even calling
any function we can override.
Patch by: Sverre Rabbelier
"""
Portable file locking utilities.
Based partially on example by Jonathan Feignberg <jdf@pobox.com> in the Python
Cookbook, licensed under the Python Software License.
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65203
Example Usage::
>>> from django.core.files import locks
>>> f = open('./file', 'wb')
>>> locks.lock(f, locks.LOCK_EX)
>>> f.write('Django')
>>> f.close()
"""
__all__ = ('LOCK_EX','LOCK_SH','LOCK_NB','lock','unlock')
system_type = None
try:
import win32con
import win32file
import pywintypes
LOCK_EX = win32con.LOCKFILE_EXCLUSIVE_LOCK
LOCK_SH = 0
LOCK_NB = win32con.LOCKFILE_FAIL_IMMEDIATELY
__overlapped = pywintypes.OVERLAPPED()
system_type = 'nt'
except (ImportError, AttributeError):
pass
try:
import fcntl
LOCK_EX = fcntl.LOCK_EX
LOCK_SH = fcntl.LOCK_SH
LOCK_NB = fcntl.LOCK_NB
system_type = 'posix'
except (ImportError, AttributeError):
pass
def fd(f):
"""Get a filedescriptor from something which could be a file or an fd."""
return hasattr(f, 'fileno') and f.fileno() or f
if system_type == 'nt':
def lock(file, flags):
hfile = win32file._get_osfhandle(fd(file))
win32file.LockFileEx(hfile, flags, 0, -0x10000, __overlapped)
def unlock(file):
hfile = win32file._get_osfhandle(fd(file))
win32file.UnlockFileEx(hfile, 0, -0x10000, __overlapped)
elif system_type == 'posix':
def lock(file, flags):
fcntl.lockf(fd(file), flags)
def unlock(file):
fcntl.lockf(fd(file), fcntl.LOCK_UN)
else:
# File locking is not supported.
LOCK_EX = LOCK_SH = LOCK_NB = None
# Dummy functions that don't do anything.
def lock(file, flags):
pass
def unlock(file):
pass