Pick up kernelspecs from Jupyter directories

[rgbkrk]

We'll need/want to search the new Jupyter paths as well for kernelspecs, just as in https://github.com/jupyter/jupyter_core/blob/master/jupyter_core/paths.py

This is for the future release of the Jupyter packages (but my and the rest of the IPython/Jupyter team's likeliness to use this package).

[willwhitney]

Which of these directories contains the kernelspecs? ~/.jupyter?

[rgbkrk]

Multiples. It's the aggregation of all of them...

In [1]: import jupyter_core.paths

In [2]: jupyter_core.paths.jupyter_path("kernels")
Out[2]:
['/Users/rgbkrk/Library/Jupyter/kernels',
 '/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/share/jupyter/kernels',
 '/usr/local/share/jupyter/kernels',
 '/usr/share/jupyter/kernels']

This is where I was bantering around with creating a simple wrapper script that would dump JSON to stdout with options we'd need from an alternate front end (like Hydrogen). The other alternative is to use what we've got and launch a python kernel just for Hydrogen that queries for this same information.

It's either that or always searching particular paths.

[willwhitney]

Gosh, that's ugly. I'd sure love a script that dumps JSON of all the kernels' info.

[willwhitney]

Especially if that script worked across IPython and Jupyter.

[rgbkrk]

As the migration happens, IPython will just be one of the kernels for Jupyter. It's all the same team.

When I get some free time after work, I'll start poking at what scripts could be useful for Hydrogen and Jupyter sidecar to call out to Jupyter for accurate information.

[willwhitney]

What I mean is that I'd like this to still work for people who haven't
updated to a post-Split version. I find most people don't update until
something completely stops working.

Thanks!

On Tue, May 19, 2015 at 4:51 PM Kyle Kelley notifications@github.com
wrote:

As the migration happens, IPython will just be one of the kernels for
Jupyter. It's all the same team.

When I get some free time after work, I'll start poking at what scripts
could be useful for Hydrogen and Jupyter sidecar to call out to Jupyter for
accurate information.

—
Reply to this email directly or view it on GitHub
#7 (comment).

[rgbkrk]

Totally, I'll end up making a script that straddles both.

Also, people are strange and install from master whether or not they're contributing to IPython/Jupyter. For this release it's a bit silly since it's mostly repackaging, but in previous versions it was a big delta.

[willwhitney]

Awesome!

For the moment I'm loading all kernels found in that list plus ~/.ipython/kernels and ~/.jupyter/kernels. Not a good answer, but it ought to tide us over for now. That's in the latest release.

[rgbkrk]

Done in #19.