I'd like to get an ability in Roundup to specify URL in config so that 
Roundup could link revisions references in messages, such as r3450, into 
actual links to specified URL using number as a parameter to this config 
string. Is it hard to implement? Where should one start from?

For the example, look at bugs.python.org web-site.

Hi Anatoly,
are you looking for
./share/roundup/templates/devel/extensions/local_replace.py
./share/roundup/templates/responsive/extensions/local_replace.py
./website/issues/extensions/local_replace.py

E.g. see rev7625dcb7e946

Yes, I've discovered the mechanism after some years.
Here the rules are hardcoded and I needed something of user level.

On Thu, Mar 13, 2014 at 1:03 PM, Bernhard Reiter
<issues@roundup-tracker.org> wrote:
>
> Bernhard Reiter added the comment:
>
> Hi Anatoly,
> are you looking for
> ./share/roundup/templates/devel/extensions/local_replace.py
> ./share/roundup/templates/responsive/extensions/local_replace.py
> ./website/issues/extensions/local_replace.py
>
> E.g. see rev7625dcb7e946
>
> ----------
> nosy: +ber
>
> ________________________________________________
> Roundup tracker <issues@roundup-tracker.org>
> <http://issues.roundup-tracker.org/issue2550737>
> ________________________________________________

Ah, okay, you are talking about a user level config?
Where do you want to expose the configuration?

host level?
webinterface user level?
webinterface admin level?

On Thu, Mar 13, 2014 at 3:16 PM, Bernhard Reiter
<issues@roundup-tracker.org> wrote:
>
> Ah, okay, you are talking about a user level config?
> Where do you want to expose the configuration?
>
> host level?
> webinterface user level?
> webinterface admin level?

As a user I need it per tracker. Not sure where it should be stored.

On Friday 14 March 2014 at 13:59:22, anatoly techtonik wrote:
> As a user I need it per tracker. Not sure where it should be stored.

The "extensions" directory is already per tracker, so I assume you do not want
it on a config file on the roundup server machine.

You could add an new object with a string property
and access permissions for the admin. That would make it read/write
in the webinterface via the class administration.
Then you only need to read that value in the local_replace.py extension.

Hi Anatoly can you further specify how you want this to work
if the options offered by Bern are not enough?

This seems like a tracker config issue and not something that needs
to be supported by the roundup core.

You could create a "userconfig" class with name and value
string types.

Then:

name = revisionid
value = http://example.site.org/hgview/%s

then in the local replace, open the db, lookup the "revisionid"
object and value. If you see \br[0-9a-f]{6,64}\b in the text,
grab the stuff after the r and format it into the value (url string).

- rouilj

Source: http://psf.upfronthosting.co.za/roundup/meta/issue431