[PATCH] Filter: picking community elements and finding min/max element

[Alexander Zubkov]

Of course I forgot to attach the patches. :)

On Thu, Dec 16, 2021 at 2:41 PM Alexander Zubkov <green at qrator.net> wrote:
>
> Hi everyone!
>
> I made a couple of patches to do some interesting stuff with communities.
> The first patch allows to pick a component from a standard or a large community:
>
> (10, 20, 30) @ 2 --> 20
>
> And the second patch allows to search for minimum or maximum element
> in a community list. This combined allows to do some cool stuff with
> communities like this:
>
> bgp_local_pref = filter(bgp_large_community, [(<as>, <localpref_val>,
> *)]).min @ 3
>
> This will find us the minimum from our "localpref" communities and get
> that number as integer, ready to assign it where we need. Now we use a
> series of if's to check all the possible variants and that is not very
> convenient. I think this features will greatly boost the possibilities
> of working with communities in bird.
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