[TIP] designing ways for tox to inherit dependencies and other parts of the environment configuration

[Ronny Pfannschmidt]

Hi,

since i got aware of quite a few people (including me)
that are unhappy with the need of repetition in tox environment
configurations,

we should come up with a good way to express commands/dependencies that
are common

the first way i came up with, is a simple inherit key, that is processed
before adding the data from the current section and adds dependency
items from a "base section"

with its help something like


------------------
[testenv]
commands=...

[testenv:foo-12]
deps=
   pytest
   pytest-cov
   foo==1.2

[testenv:foo-13]
deps=
   pytest
   pytest-cov
   foo==1.3
....
-----------------
can be reduced to

-----------------
[base:foo]
deps=
   pytest
   pytest-cov

[testenv]
commands=...
inherit=foo

[testenv:foo-12]
deps=foo==1.2

[testenc:foo-13]
deps=foo==1.3

...
-----------------

another idea is to have something like

-----------------

[depsets]
foo=
   pytest
   pytest-cov
[testenv]
depsets = foo
...

-----------------

I'm pretty sure there are still some conceptual issues in those
approaches, thus i want to have a discussion on how to proceed

i already implemented the first outlined approach as proof of concept
(without a way to debug the source of a dependency)

Regards,
Ronny Pfannschmidt

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