[DX] Split path.path.inc file into their respective modules

[opi]

https://github.com/backdrop/backdrop/blob/1.x/core/modules/path/path.path.inc

This file implements hook_path_info for 3 other core modules : node, taxonomy and user.

Quoting the path.path.inc top comment:

Path is an optional module in Backdrop, providing essentially a UI for the
core path functionality. Because this module may be disabled, it's up to this
module to provide implementations for other core modules.

I really don't understand the point here. I think we are facing the same issue as #2952 (comment) with hook_layout_context_info.

Some related issues : #2954 & #3024

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PR backdrop/backdrop#2254

[jlfranklin]

There is no reason node, taxonomy, and user can’t own their own hook implementations. They won’t be called unless path is enabled.

This may be a hold over from when Path was a contrib module. Core doesn’t implement hooks for non-core modules.

[opi]

Core doesn’t implement hooks for non-core modules.

Indeed, It explains everything here. Thanks

[opi]

backdrop/backdrop#2254 is ready for review

[klonos]

The PR looks good to me, but I would like someone with more knowledge on this to also take a look.

By removing the path.path.inc file, we have lost this docblock:

/**	
 * @file	
 * Path integration for core modules.	
 *	
 * Path is an optional module in Backdrop, providing essentially a UI for the	
 * core path functionality. Because this module may be disabled, it's up to this	
 * module to provide implementations for other core modules.	
 */

Not sure if I get things right, but does the above mean that every *_path_info() function should be checking if (module_exists('path'))? ...or am I missing the point here, and the core path functionality is all that's needed?

[opi]

This docblock is actually wrong I guess. And implementing a hook for a disabled module is no harm

[quicksketch]

Looks great. I've merged backdrop/backdrop#2254 into 1.x. This shouldn't be an API change (it's functionally identical), but the rearrangement might surprise some people so I've not backported it into 1.10.x.