The following module was proposed for inclusion in the Module List:
modid: lib::vswitch
DSLIP: adppp
description: select another version of 'dist' into @INC
userid: MCAST (Matthew Astley)
chapterid: 27 (Pragma)
communities:
none; rt.cpan.org or Github merge request
similar:
lib Project::Libs lib::restrict Apache::PerlVINC Module::Mask
rationale:
Observed problem to solve:
Some code-bases rely on a specific (not the latest) version of a
distribution of modules. They usually manage this by installing it
during app setup and calling "use lib" with that. Hopefully, only
once.
I found many libraries to do things to @INC, some discussed below,
but nothing to manage potential conflict e.g. loading one module
from BioPerl-0.7.2 before putting BioPerl-1.2.3 onto @INC - YMMV!
Choice of lib::vswitch name:
It needs to be not much longer than 'lib' and imply change to @INC.
It isn't specific to the Bio:: namespace, although this is the area
I currently observe the problem.
I am cautious to request lib:: namespace, hence registering before
uploading. Code is at https://github.com/mca-wtsi/lib-vswitch
It is not too late to change the name, if you have a better idea.
Related modules:
lib - proposed lib::vswitch does the same, but without requiring
the caller to know the path, and with more checking
Project::Libs - another @INC extender, in non-lib namespace
lib::restrict - another @INC extender, in lib namespace
Apache::PerlVINC - module version switching, in mod_perl context
Module::Mask - lib::vswitch may need to do something similar, to
prevent accidents with partially shadowed dists
I don't see a general way to compose such features together, and I
think that would be a separate problem.
However, tweaking of lib::vswitch by the caller should be possible
by subclassing (but YAGNI?).
Thanks, -- Matthew
enteredby: MCAST (Matthew Astley)
enteredon: Thu Nov 24 00:27:52 2011 GMT
The resulting entry would be:
lib::
::vswitch adppp select another version of 'dist' into @INC MCAST
Thanks for registering,
--
The PAUSE
PS: The following links are only valid for module list maintainers:
Registration form with editing capabilities:
https://pause.perl.org/pause/authenquery?ACTION=add_mod&USERID=86800000_35ebf8feacf2eb6f&SUBMIT_pause99_add_mod_preview=1
Immediate (one click) registration:
https://pause.perl.org/pause/authenquery?ACTION=add_mod&USERID=86800000_35ebf8feacf2eb6f&SUBMIT_pause99_add_mod_insertit=1
Peek at the current permissions:
https://pause.perl.org/pause/authenquery?pause99_peek_perms_by=me&pause99_peek_perms_query=lib%3A%3Avswitch
