Task::Kensho – "A Glimpse at an Enlightened Perl"

See its manual page at CPAN!

• The installations with/for my self-brewn perl-5.12.1 on openSUSE-11.2 as well as on OS X Snow Leopard have a problem with Task::Kensho's TryCatch, I skip that, and all the remainder seems to be fine.
• The installation with/for my self-brewn perl-5.10.1 on openSUSE-11.2 runs straight through.
• The installation with/for the "native" perl-5.10.0 on my openSUSE-11.2 runs straight through.

App::cpanminus – a new CPAN installer

• article in German: "Perl 5.12 parallel zu einem bestehendem Perl installieren - App::cpanminus als CPAN-Installer" (by Thomas Fahle)
• metacpan.org/module/App::cpanminus
• …

How to …:

$ perlbrew switch stable # resp.
$ perlbrew switch perl-5.12.1
$ cpan  App::cpanminus
$ cpanm App::cpanminus 
$ perlbrew install-cpanm # remove the previous suggestions?

$ perlbrew switch perl-5.10.1
$ cpan  App::cpanminus
$ cpanm App::cpanminus
$ perlbrew install-cpanm # remove the previous suggestions?

To be continued ...

App::perlbrew - Manage perl installations in your $HOME or wherever you want

Prerequisites:

• $ zypper install patch
• $ zypper install gcc
• …

Caveat:

• yes, "perlbrew install" occasionally and too often  needs "--force" and even "--notest", don't be too surprised! my "5.14.2" and also my "5.16.1" needed it
• …

Main links:

• www.perlbrew.pl
• $ perlbrew
• $ perlbrew help
• http://search.cpan.org/perldoc?App::perlbrew – this one tells you, how to upgrade perlbrew:

$ export PERLBREW_ROOT=/opt/perlbrew
$ curl -kL http://install.perlbrew.pl | bash
# or maybe like this:
$ perlbrew self-upgrade

• https://metacpan.org/module/App::perlbrew
• https://metacpan.org/module/perlbrew : list-modules, how to migrate modules together with cpanm, …
• http://www.perl.org/pub/2010/03/testing-perl-5120-rc-1-with-appperlbrew.html (a little outdated)
• Perlbrew and my shebang line [Link]:

The developer/maintainer does not have in mind this use case as the main use case!! But it is my main use case.
What to do after installing a new perl, that you consider your new stable perl?

$ perlbrew alias create perl-RELEASE stable 

# resp.
$ perlbrew alias -f create perl-RELEASE stable
# use this shebang line with $PERLBREW_ROOT expanded [Link]:
#! $PERLBREW_ROOT/perls/stable/bin/perl

$ perlbrew switch stable # this will be our usual starting point!!! 

# but "perlbrew list-modules" does not work on such an alias, so "perlbrew use" to a non-alias before!

• Have a serious look at "$ perlbrew help" once in a while!!!

I decided to make use of $PERLBREW_ROOT, as I want to keep my home $HOME minimial, just data and scripts, no big files, they all go to other disks. And right, my home directory is on an encrypted partition, and this sort of stuff certainly does not get encrypted.

$ export PERLBREW_ROOT=/usr/local/perlbrew

Therefore my perlbrew is installed as:

/usr/local/perlbrew/bin/perlbrew

They suggest, that my $HOME/.bashrc should "source" their .../etc/bashrc, but for the time being I let my $HOME/.profile do this, as IMHO this is right place.
So actually this is according to best practices for shell programming the right way (for me) to do it, and now this code is of course included in my $HOME/.profile:


# for perl's App::perlbrew :
export          PERLBREW_ROOT=/usr/local/perlbrew # on my Linux boxes
export          PERLBREW_ROOT=/sw/perlbrew # on my Mac box(es)
source         $PERLBREW_ROOT/etc/bashrc
##export  PATH=$PERLBREW_ROOT/bin:$PERLBREW_ROOT/perls/current/bin:${PATH}
path_prepend   $PERLBREW_ROOT
path_prepend   $PERLBREW_ROOT/perls/current


BTW: always "$ hash -r" after switching, so you avoid getting certain perl resp. perlbrew related error messages like this one and a few others (confusion of the right installation directory):

bash: …: No such file or directory

I successfully brewed 5.10.1 and 5.12.1 on openSUSE-11.2, but on OS X Snow Leopard I only brewed 5.12.1 successfully, brewing 5.10.1 failed.


To be continued …


Update 2011-10-16:
On my Mac running Lion I was able to perlbrew these releases of perl

• perl-5.15.3 and
• perl-5.14.2
• but not perl-5.12.4, 5.10.1, 5.8.9, 5.6.2

but that seems more than sufficient to me.

Looks like OS X got targeted as a serious platform for perl development only rather recently.
…

Update 2012-10-07: A historic note: I first looked into perlbrew in the context of "biz-JG".