[PATCH 1 of 2 V2] util: add a way to issue deprecation warning without a UI object

[Pierre-Yves David]

On 04/09/2017 03:08 PM, Yuya Nishihara wrote:
> On Sat, 8 Apr 2017 11:37:20 +0200, Pierre-Yves David wrote:
>> On 04/08/2017 10:16 AM, Yuya Nishihara wrote:
>>> On Fri, 7 Apr 2017 19:03:55 +0200, Pierre-Yves David wrote:
>>>> On 04/06/2017 05:44 PM, Yuya Nishihara wrote:
>>>>> On Thu, 6 Apr 2017 16:09:07 +0200, Pierre-Yves David wrote:
>>>>>>> If dirty hack allowed, I would do something like the following:
>>>>>>>
>>>>>>>   # util.py
>>>>>>>   def _deprecwarn(msg, version):
>>>>>>>       pass
>>>>>>>
>>>>>>>   # somewhere ui is available, maybe in dispatch.py
>>>>>>>   util._deprecwarn = ui.deprecwarn
>>>>>>
>>>>>> That is a diry hack. I would prefer we did not used it.
>>>>>
>>>>> Yeah, that is dirty and I don't like it. But I'm okay with it as long as
>>>>> it is a temporary hack.
>>>>
>>>> If you think the dirty hack is worth the potential extra exposure, I'm
>>>> fine with it.
>>>>
>>>> However, I'm confused about your usage of "temporary hack" here. Why are
>>>> you using temporary?
>>>
>>> I suppose the hack will hopefully disappear with the vfs compat layer. I'm not
>>> sure if a permanent one is necessary.
>>
>> I think this kind of needs will appears again in the future. So I would
>> not flag the solution as temporary. I would have made the function local
>> to the scmutil module.
>>
>> So I would rather have a long terms solution. What do you think?
>
> If we need less ad-hoc one, I would add a global flag to enable deprecwarn
> and set it only by global configuration (i.e. ui, not lui nor repo.ui.)

This seems a bit hacky (I also have some concerns about possible of 
deprecated function being created before the ui is. but I'm not sure 
they are funded).

> And perhaps will remove ui.deprecwarn() in favor of util.deprecwarn().

ui.deprecwarn is much more configurable and manageable that the global 
one (based on Python deprec warning). I do not think we should drop 
`ui.deprecwarc` in favor of the other one.

Cheers,

-- 
Pierre-Yves David