Add tag import utility for Simple Tagging plugin

[bloertscher]

Add the ability to import tags created with the Simple Tagging plugin ( http://trac.herewithme.fr/project/simpletagging/) into the new WordPress native tags.

Will we include this in core, or fix #4614, so it can be done as a plugin/bundled with the plugin?

How widely used is this? I've not heard of it. How close is it to the size of Jerome's Keywords or Ultimate Tag Warrior? Trying to decide whether this should go in core or be a plugin.

markjaquith : I see people mentioning it on the support forums all the time. I'd guess that Simple Tagging is more popular than Jerome's keywords, but not as popular as UTW.

Anyway, IMO, yes, this should be an importer available from the initial release of any WordPress version that includes tagging. It's necessary for adoption for a lot of people.

+1

We need to add function_exists() wrappers. On fail, we should tell people that the plugin needs to be active for the import (as we're using the plugin's functions to grab the data). After a successful import, we should tell people that they can now deactivate the plugin and switch to using WP tag API functions.

marik: Agreed, however, same thing needs to happen for the other tag importers if that is the case. The UTW importer should only be active if the UTW plugin is active, for example.

We can put STP and Jerome's in core for 2.3 and move them to plugins a couple releases down the line.

Add nonces to this and I think it's good for 2.3 inclusion.

Patch with nonces added

(In [5977]) Simple Tagging importer. Props bloertscher and joostdevalk. fixes #4247