Can't access original slug with wp_unique_post_slug filter

[bradyvercher]

This is a follow up to ​#14111.

The slug passed to the 'wp_unique_post_slug' filter may already be suffixed by the time it's accessible. This requires the default suffix algorithm to be reversed if a developer wants access to the original slug in order to apply their own uniqueness algorithm.

It would be great if the original slug was passed as a parameter in the current filter, or if a new filter was added before the default uniqueness algorithms are executed.

[johnbillion]

I'd class this as a bug. The filter has limited use without passing the original slug.

[johnbillion]

Patch

[bradyvercher]

That should do it. Thanks!

As an enhancement, something like a pre_wp_unique_post_slug filter that operates similar to ​this patch might also be beneficial so plugins can bypass the default processing.

[coffee2code]

Adds wp_unique_post_slug filter as proposed in 20480.patch​; adds pre_wp_unique_post_slug filter; adds some phpDoc

[coffee2code]

+1

As @johnbillion said, the wp_unique_post_slug filter is of limited, or at least diminished, use if the original slug isn't also passed. If passed, then any hooked functions could easily detect if wp_unique_post_slug() modified the incoming slug due to a conflict and could act accordingly (perhaps using different slug renaming logic or for logging).

And as @bradyvercher most recently mentioned, a pre_wp_unique_post_slug filter could be useful and justified here for a few reasons:

• The wp_unique_post_slug() function (and thus the filter) is not high use, so won't impact performance
• wp_unique_post_slug() performs database queries (perhaps repeatedly until a unique slug is found), all of which may be rendered moot if a hooking function's intent is to implement its own slug generation/handling logic. The pre slug could short-circuit that unnecessary effort.

Attached 20480.2.diff​ which amends original patch to add pre filter and some phpDocs.

[nacin]

Sounds good. Can we consider the pre_* filter in a separate ticket?

[nacin]

In [21177]:

Take the original slug passed into wp_unique_post_slug() and pass it to the wp_unique_post_slug filter. props johnbillion. fixes #20480.

[coffee2code]

Replying to nacin:

Sounds good. Can we consider the pre_* filter in a separate ticket?

Opened as #21112.