[josm-dev] Can I style by user in mappaint?

[Ævar Arnfjörð Bjarmason]

On Sat, Jan 16, 2010 at 04:25, Ulf Lamping <ulf.lamping at googlemail.com> wrote:
> Am 15.01.2010 09:05, schrieb Jiri Klement:
>> I think it would be nice to use search patterns in mappaint. The style
>> information is cached in OsmPrimitive so it shouldn't have impact on
>> overall performance.  And there are probably other usecases when
>> key=value matching is not sufficient.
>>
>> Actually I was planning to do some prototype to see if performance
>> really isn't a problem
>
> Might be a problem for initial reading of large datasets, but you cannot
> say wether it's acceptable or not until you've really tried it.
>
> That's the conclusion I've got when doing the first round of mappaint
> performance improvements a lot of time ago :-)
>
>> and then ask here if it is really a good idea
>> to switch to search patterns. But when avar brought it up, we can
>> start the discussion now. So are there any other usecases when search
>> patterns would be usefull in mappaint or any objections agains search
>> patterns?
>
> Avar was the first one I've seen to come up with "show me stuff from
> user xy in a special way". I'm unsure if this is really a common use case.

FWIW potlatch does this every day by rendering things differently if
user == the guy who uploaded tiger && tiger:reviewed == ....

> Personally, I'd like to keep things simple here - so even none
> developers have at least a chance to write their own rendering rules.
>
> Otherwise complexity grows and grows and ends up like the mapnik
> rendering rules with embedded SQL statements - the learning curve is now
> really high :-(

Sure, but <condition user="foo" /> isn't that much harder than
<condition k="" v=""/> :)