[wp-trac] [WordPress Trac] #4147: Separate post and link category management and taxonomy

[WordPress Trac]

#4147: Separate post and link category management and taxonomy
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 Reporter:  ryan            |       Owner:  ryan                  
     Type:  defect          |      Status:  new                   
 Priority:  high            |   Milestone:  2.2                   
Component:  Administration  |     Version:  2.2                   
 Severity:  normal          |    Keywords:  category link post tag
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 Since we didn't go the route of having the complete pool of categories
 show up on the write post and add link pages back in 2.1, the unified
 management UI doesn't make as much sense.  It is a source of confusion
 since the post and link categories are united under Manage->Categories but
 separated everywhere else.  Instead let's resurrect link category
 management under Blogroll->Categories.  To accomplish this, we will need
 to add some API and add a new taxonomy type.

  * TAXONOMY_LINK_CATEGORY will be added as a valid value for the type
 bitfield in the categories table
  * wp_create_link_category() will create a new link category.  It will
 call wp_insert_category() to do the heavy lifting and pass the type as
 TAXONOMY_LINK_CATEGORY. wp_insert_category() will handle create a new
 category object if one doesn't exist or setting the type on an existing
 category object.
  * wp_delete_link_category() will delete a link category.  The link logic
 in wp_delete_category() should be split out into
 wp_delete_link_category().  Each call should delete the underlying
 category object only if the bitfield is clear. Otherwise it should just
 remove the appropriate bit from the field.
  * Refactor wp-admin/categories.php so that it can manage both link and
 post categories and be presented under separate tabs in the admin UI.
  * Possibly break the non-idempotent operations in wp-admin/categories.php
 into wp-admin/category.php and modify them to accommodate link and post
 categories.

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Ticket URL: <http://trac.wordpress.org/ticket/4147>
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