Re: [GSoC] blends-gen-control hints (Was: blends-dev, gsoc 2013)

[Emmanouil Kiagias <e.kiagias@gmail.com>]

Hello Andreas

On Thu, Jul 11, 2013 at 8:29 PM, Andreas Tille <andreas@an3as.eu> wrote:

On Thu, Jul 11, 2013 at 06:30:20PM +0300, Emmanouil Kiagias wrote:
> > Any idea?
> >
> > Oups I did not think of this case (like the "freeb" example). Instead of
> regex(to be honest I did not find anything new on this) I think this fits
> us:
>
> query="""
>                  SELECT DISTINCT provides, p.distribution, component,
> r.sort FROM packages p
>                   JOIN releases r ON p.release = r.release
>                   WHERE provides SIMILAR TO '{0}|{0},%|% {0} %|% {0}, %'
>                   ORDER BY r.sort DESC
>                   LIMIT 1
> """.format('djvu-viewer')
>
> A "similar to"  with multiple OR statements inside to cover our cases:
> single OR virtual, % OR % virtual % OR % virtual.
> At first it looks fine, I need to make more tests. This example does not
> catch "freeb" and catches correctly the "djvu-viewer"
> Let me know what you think.

Uhm, need to cope with the {0} syntax.  Meanwhile I've got a hint from a
(German) psql list:

its :.. WHERE provides SIMILAR TO 'djvu-viewer|djvu-viewer,%|% djvu-viewer %|% djvu-viewer, %'

so {0} just replaces the first(0 index) element of the format() function which in our case is the 'djvu-viewer' string. it can be similar in the EXECUTE as : ...  WHERE provides SIMILAR TO '$1|$1,%|% $1 %|% $1, %'

Anyway as you said everything that works is fine :-) .Are you going to commit the patch? Or we need to make more tests?

Kind regards

Emmanouil