[TIP] Fwd: finalizing tox's new parametrized configuration (RFC)

[Carl Meyer]

On 08/08/2014 08:55 AM, Alexander Schepanovski wrote:
>> Using the new syntax your tox.ini should collapse like this::
>> 
>>     [tox]
>>     envlist = {py26,py27,py32,py33}-{1.4,1.5,1.6},
>>               {py27,py32,py33}-trunk,
>>               py27-1.5-nosouth
>>               
>>     [testenv]
>>     deps =
>>         coverage == 3.6
>>         1.4: Django == 1.4.10
>>         1.5: Django == 1.5.5
>>         1.6: https://github.com/django/django/tarball/stable/1.6.x
>>         trunk: https://github.com/django/django/tarball/master
>>         1.4: South == 0.7.6
>>         1.5,1.6: South == 0.8.1
>> 
>>     commands = coverage run -a setup.py test
> 
> There is one nuance here not covered: South==0.8.1 will be installed for
> py27-1.5-nosouth. To handle that one could change last deps line to:
> 
>     1.5-!nosouth,1.6: South == 0.8.1
> 
> (Neither AND with -, nor negation inside an expression are implemented yet)
> 
> However, negation could lead to confusion I told about earlier, so we
> (me and Holger) are agreed to exclude it for now. Without using negation
> this could be written as:
> 
>     [tox]
>     envlist = {py26,py27,py32,py33}-{1.4,1.5,1.6}-south,
>               {py27,py32,py33}-trunk-south,
>               py27-1.5-nosouth
>               
>     [testenv]
>     deps =
>         ...
>         {1.5,1.6}-south: South == 0.8.1

Good catch. And this version seems unfortunate to me; I much prefer the
version with exclusion/negation. Personally I don't find something like
"1.5-!nosouth,1.6" confusing -- my first assumption would be that that
is negating the specific factor it precedes.

Carl