Jedi 0.18 update

[cfroehli]

I noticed the completion was broken after upgrading my emacs setup and looked a bit into it.

Jedi 0.18 seems to drop old, unmaintained python releases and to rename a few class/methods, breaking the epcserver (emit a warning in 0.17.X) :
- line / column are now passed at the method call instead of the jedi.Script init. I didn't want to break the epcserver interface so I've just split the *args to dispatch the parameter where needed.
- renamed a few calls (call_signatures is now get_signatures, ...)
- the desc_with_module attribute is no more available in jedi api (no replacement for now). I've put full_name instead so the method call don't fail but we may want some other value here.

So far, the completion/definition jump is back (using latest company-jedi and fresh emacs master build) but some more exhaustive tests may be required to ensure all features are ok.

Changes are not compatible with older jedi version thus 0.18+ is enforced in setup and test configuration, and the version was bumped to 0.3.0.

This can probably help to fix #348, fix #352, fix #353.

Feel free to comment / request changes.

[return42]

approved! .. Thanks a lot for the bugfix .. ATM emacs-jedi breaks python workflows, would be great to see this PR merged soon.

[immerrr]

Hi, thank you for the contribution. It looks promising. Do you think it is possible to make it backward compatible with relatively low effort?

[cfroehli]

I had to make it work real quick before a job interview so I didn't look too much into it, but it is probably not that difficult. I'll add some compatibility layer.

[cfroehli]

Python2 & <3.5 are stuck with 0.17.2 at best. If jedi is recent enough, we directly use the new api.
If jedi < 0.16 is installed, we'll use the old api through a thin adapter layer, so less fuss to remove the compatibility code later.
The tests are launched with 2.7 and 3.6 with jedi 0.17.2 and 0.11.1, and latest pythons (3.5~3.9) with jedi 0.18+.

[immerrr]

Thanks, I'm going to merge this after CI reports green.

[immerrr]

Thank you so much for getting this through!

[return42]

Thank you so much for getting this through!

Same from my side .. thanks a lot!!

@immerrr do you have time to build a new release? Would be much comfortable to have this fix in MELPA.

Anyway I would also thanks to you @immerrr, that you give us this comfortable emacs module. :)