small fixes for the parent patch
- format.usestore is a boolean option
- python wart: ("revlogv1") is a string, not a tuple
- only create a dummy changelog if we're using a store
- add a test
# demandimport.py - global demand-loading of modules for Mercurial
#
# Copyright 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
'''
demandimport - automatic demandloading of modules
To enable this module, do:
import demandimport; demandimport.enable()
Imports of the following forms will be demand-loaded:
import a, b.c
import a.b as c
from a import b,c # a will be loaded immediately
These imports will not be delayed:
from a import *
b = __import__(a)
'''
_origimport = __import__
class _demandmod(object):
"""module demand-loader and proxy"""
def __init__(self, name, globals, locals):
if '.' in name:
head, rest = name.split('.', 1)
after = [rest]
else:
head = name
after = []
object.__setattr__(self, "_data", (head, globals, locals, after))
object.__setattr__(self, "_module", None)
def _extend(self, name):
"""add to the list of submodules to load"""
self._data[3].append(name)
def _load(self):
if not self._module:
head, globals, locals, after = self._data
mod = _origimport(head, globals, locals)
# load submodules
def subload(mod, p):
h, t = p, None
if '.' in p:
h, t = p.split('.', 1)
if not hasattr(mod, h):
setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__))
elif t:
subload(getattr(mod, h), t)
for x in after:
subload(mod, x)
# are we in the locals dictionary still?
if locals and locals.get(head) == self:
locals[head] = mod
object.__setattr__(self, "_module", mod)
def __repr__(self):
return "<unloaded module '%s'>" % self._data[0]
def __call__(self, *args, **kwargs):
raise TypeError("'unloaded module' object is not callable")
def __getattribute__(self, attr):
if attr in ('_data', '_extend', '_load', '_module'):
return object.__getattribute__(self, attr)
self._load()
return getattr(self._module, attr)
def __setattr__(self, attr, val):
self._load()
setattr(self._module, attr, val)
def _demandimport(name, globals=None, locals=None, fromlist=None):
if not locals or name in ignore or fromlist == ('*',):
# these cases we can't really delay
return _origimport(name, globals, locals, fromlist)
elif not fromlist:
# import a [as b]
if '.' in name: # a.b
base, rest = name.split('.', 1)
# email.__init__ loading email.mime
if globals and globals.get('__name__', None) == base:
return _origimport(name, globals, locals, fromlist)
# if a is already demand-loaded, add b to its submodule list
if base in locals:
if isinstance(locals[base], _demandmod):
locals[base]._extend(rest)
return locals[base]
return _demandmod(name, globals, locals)
else:
# from a import b,c,d
mod = _origimport(name, globals, locals)
# recurse down the module chain
for comp in name.split('.')[1:]:
mod = getattr(mod, comp)
for x in fromlist:
# set requested submodules for demand load
if not(hasattr(mod, x)):
setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__))
return mod
ignore = ['_hashlib', '_xmlplus', 'fcntl', 'win32com.gen_py']
def enable():
"enable global demand-loading of modules"
__builtins__["__import__"] = _demandimport
def disable():
"disable global demand-loading of modules"
__builtins__["__import__"] = _origimport