[buddypress-trac] [BuddyPress Trac] #9224: Introduce a filterable function to inform about whether BP is running from `src`

[buddypress-trac]

#9224: Introduce a filterable function to inform about whether BP is running from
`src`
-------------------------+-----------------------------
 Reporter:  imath        |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Core         |    Version:
 Severity:  normal       |   Keywords:
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 This is a follow up of the patch @emaralive suggested about #9210.

 As he commented on the corresponding GH PR, I haven't explained why I
 decided to not include the part where he was adding a filter to bypass the
 `defined( 'BP_SOURCE_SUBDIRECTORY' ) && BP_SOURCE_SUBDIRECTORY` so that
 testing how the deprecated code is loaded can be achieved using the trunk
 (development) version of BuddyPress.

 To perform this kind of tests as well as whether minified JavaScript are
 loaded, we already have something in place: testing a build.

 We can do: `grunt build` from the console/terminal and then the `/build`
 subdirectory will be generated and BuddyPress will load from there instead
 of the `/src` subdirectory. I'd personally advise using this way.

 But if you think we should introduce a filter, then I suggest to avoid
 some code duplication at the same time, introducing the
 `bp_is_running_from_src_subdirectory()` filterable function.

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Ticket URL: <https://buddypress.trac.wordpress.org/ticket/9224>
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