Hi!

On 2016-04-08, Volker Braun <vbraun.n...@gmail.com> wrote:
> Automatic import of additional globals into the Sage command line should be 
> determined by configuration file(s) in SAGE_LOCAL/etc/sagemath (or so), not 
> by mokeypatching stuff in Sage. Feel free to send in a patch...

One should also mention that meanwhile we have optional Cython modules.
In other words, if you have an optional spkg foo and some code that
makes foo usable in Sage, then you could create an optional Cython
module sage.bar that depends on foo.

Consquence:
- Documentation of sage.bar would be available, regardless whether foo
  is installed or not. A side remark on modularisation: I very much
  appreciate to have the full documentation available from within
  Sage. I wouldn't like to search the internet for documentation of
  things that I *could* do with Sage after installing some optional
  module.
- The installation of the optional spkg foo would *not* alter the Sage
  library (which would end in chaos). Instead, "make foo" (if I recall
  correctly) would install the optional spkg foo and then create
  sage.bar. While documentation of sage.bar is always available,
  documentation of foo will only be available after you install it,
  preferably in the default location mentioned by Volker.

See sage.matrix.matrix_gfpn_dense for an example (and have a look at
SAGE_ROOT/src/module_list.py). It is an optional Cython module depending
on the optional MeatAxe spkg.

Cheers,
Simon

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