[TYPO3-core] RFC: #14258: t3lib_extMgm should provide API to determinde whether ext is installed or not

[Tolleiv.Nietsch]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=14258

Branches:
trunk 4-3

Problem:
For a long time "t3lib_extMgm::isLoaded()" was used to determine whether 
an extension is installed or not, but due to the "doNotLoadInFE" feature 
the result of "isLoaded" might not be enough to determine whether the 
extension really exists or not.

Solution:
The attached patch adds a isInstalled method which can be used context 
independent to determine the existence of an extension:

Additional information:
Why is that relevant: - check EXT:tt_news/trunk/pi/class.tx_ttnews.php - 
where "t3lib_extMgm::isLoaded('version')" is used to determine whether 
"versioning" is enabled or not. This worked fine for years but doesn't 
anymore due to the fact that "version" is not loaded in the frontend.

Due to the fact that especially "t3lib_extMgm::isInstalled('version')" 
is / will be needed very often, I ask to get this into 4.3 and 4.4 to 
enable proper ext handling.

Cheers,
Tolleiv

-- 
Tolleiv Nietsch
www.tolleiv.de - www.aoemedia.de
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