init.sage no longer used in notebook

[kcrisman]

See http://trac.sagemath.org/ticket/15308. This is presumably related to #169 as well, though perhaps is different.

[kcrisman]

Okay, given

try:
    attach(os.path.join(os.environ['DOT_SAGE'], 'init.sage'))
except (KeyError, IOError):
    pass

in sagenb/sagenb/notebook/worksheet.py, I think this is definitely the same as #169, though conceivably there is something even worse involved.

[kcrisman]

Hmm, but maybe it can be fixed by NOT lazy loading (as @jhpalmieri points out in http://trac.sagemath.org/ticket/15308) while still not fixing the overall attach issue.

[kcrisman]

Okay, here is something that fixes it. Feedback appreciated!

try:
    from sage.misc.preparser import load
    load(os.path.join(os.environ['DOT_SAGE'], 'init.sage'), globals(),attach=True)

although the attach=True is superfluous for now, because this does not fix #169.

---

It's really mysterious to me why this works, though, or rather why this is necessary, because from what I can tell, this is exactly the same code that should be in use in the load function from the attach call here. From messing around with this, I think that somehow the globals are clobbered beforehand, which gives a NameError for pretty much anything you could put into init.sage, which is not caught by the current try/except. But it also is not printed anywhere or outputted, because it's inside of S.execute(cmd), so it's very annoying to debug.

[kcrisman]

See #267

[kcrisman]

Closed by #267.