[kaddressbook] [Bug 332358] Regression: Baloo for tags messes up categories/groups when syncing with external collections (e.g. owncloud)

[Jonathan Marten via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=332358

--- Comment #27 from Jonathan Marten <jjm at keelhaul.me.uk> ---
(Continued from comment #26, accidentally submitted)

Obviously that decision was made on the grounds that it is better to export
nothing than something meaningless.

In order to export user visible categories it would be necessary to do a
mapping here from Akonadi tag URLs to category names.  Unfortunately KABC
cannot use Akonadi to do this as it would result in a circular dependency.  One
approach that I have therefore investigated is to generate a mapping between
Akonadi IDs and category names at the start of the export process, and pass
that all the way down to the actual vCard generation.  This means that the
vCard generation only needs to use the map and doesn't need to know about or
call any Akonadi stuff (although it does know about the format of an Akonadi
tag URL).  It's not pretty or elegant, but it works - at least for vCard export
which I have tried so far.  I'd expect that a similar approach could be taken
with vCard import, although there is the complication that new Akonadi tags may
have to be generated if they are not known already.

The patches following are against the KDE/4.14 branch.  I'm not submitting them
for review at this stage, because current PIM effort is concentrating on the
KF5 version, but they are just here for the record and in case anyone wants to
make use of them.

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