Module::Install::PhiloUseryContributed Perl DocuModule::Install::Philosophy(3)NAMEModule::Install::Philosophy - The concepts behind Module::Install
SYNOPSIS
This document describes the personal philosophy behind the creation of
CPAN::MakeMaker (the predecessor of Module::Install). The views
expressed here belong to Brian Ingerson; if they are not of interest to
you, you can safely ignore this document.
I HAVE A DREAM
I say to you today, my friends, that in spite of the difficulties and
frustrations of the moment, I still have a dream. It is a dream deeply
rooted in the Perl Module dream.
I have a dream that one day this community will rise up and live out
the true meaning of its creed: "We hold these truths to be self-
evident: that all Perl authors are created equal."
I have a dream that one day even the state of the "CGI::" namespace, a
desert state, sweltering with the heat of injustice and oppression,
will be transformed into an oasis of freedom and justice.
I have a dream that my four modules will one day live in an archive
where they will not be judged by the number of their prerequisites but
by the content of their source code.
I have a dream today.
DESCRIPTION
The above is obviously a mutation of the monumental speech by great
Martin Luther King (<http://web66.coled.umn.edu/new/MLK/MLK.html>).
While the contexts are vastly different, I feel that there are some
serious parallelisms.
The CPAN has become a place that is not free of injustice. This
situation has arisen not out of directed oppression, but from a failure
of our community to keep its tools sharp. It is the culmination of many
small decisions made in the name of practicality. This is a sad state
for an institution that was created to allow all interested people to
contribute equally to the best of their ability.
This assertion is rooted in my personal experience as an author. When I
created my first Perl module, Inline.pm, I knew that I had done
something important. But how was I to make a dent in vast Perl
community?
As a complete unknown in the Perl community, my voice did not travel
far. I repeatedly tried to get even an acknowledgment from the gurus
familiar with XS. No success. I resorted to sending messages with
ridiculous subjects to "modules@perl.org".
(http://www.xray.mpe.mpg.de/mailing-lists/modules/2000-08/msg00078.html
<http://www.xray.mpe.mpg.de/mailing-
lists/modules/2000-08/msg00078.html>) No response. Through sheer
determination and shameless self-promotion I eventually got the word
out, and I hope the world is a slightly better place for it.
Since then, Inline has won awards and I have had the privilege to meet
almost all of Perl's finest. But I still remember the pain of starting
out, and want to help invite more people into this wonderful world.
One thing I have learned from experience is that the Perl community
(and throw in the Python and Ruby people as well) is a small drop in
the vast ocean of programming. It's a giant pot of Java out there; and
a sea of C. Perl may not be the biggest fish, but with some care and
cunning we could become a much bigger school.
These are the current problems that I see with CPAN and the core
modules:
· New Modules don't help Older Perls
If I were to guess what percent of all Perl5 installations were at
the current release level (5.8.0 in October 2002) I would say 3-5%.
That may even be generous. I'd say that over 40% of installations
might still be at 5.005 or earlier.
The biggest problem with adding a module to the core is that it
only helps a small subset of Perl users for a long long time. Worse
yet, a good module author will still probably avoid using the core
additions as prerequisites, because they want their new module to
work as well on 5.005 as on 5.8.
CPAN::MakeMaker should be able to help in this regard. For example,
instead of putting Inline.pm into the core for 5.9, I can now
effectively get it into the core for every version of Perl that
Inline supports.
· Author Exclusiveness
Not just anybody can get a module into the core. It seems you have
to know people in high places. If I were a brilliant new talent
with a great new module, it would have a harder time getting the
ear of the pumpking, then if I were, say, Damian Conway. In fact, I
probably wouldn't even know where to start.
· Reduced Competition
One comment I've heard from some very good Perl programmers is
"Everything important has already been done". Their feeling is that
even though a module is suboptimal, it would be a waste of time to
write a competing module. Who would use it instead of the one
already in the core?
When I write a competing module, I know that I have to make it at
least twice as good as the existing one to even get noticed. That's
not a bad thing, but should everybody be forced into that
situation?
For example, let's say that you have created a really useful CGI
script. Let's also say that it makes use of your own CGI::Special
module, because CGI.pm doesn't meet your needs. Even though your
script might be generally useful and worth sharing, the fact that
it requires a non-standard module can only negatively affect its
acceptance. Trying to get general acceptance for the superior
CGI::Special module will be harder still.
Core modules are assumed by the general public to be "Best of
Breed". While this may be true for some modules at some point in
time, it keeps talented people from attempting to "breed" something
better.
· Core Bloat
Every time we add a module to the core it gets bigger and bigger.
And we can't ever remove modules from the core, once they've been
added.
If I had my druthers, we'd remove all modules from the core that
weren't necessary for either running Perl or installing modules. Of
course, we'd need to set things up so that installing modules was
so easy, that it could be done on the fly if necessary. Is this
easily accomplishable? Nope. Is it impossible? Nope. We have the
best language in the world to help us do it!
· Maintenance Bitrot
Believe it or not, Perl authors can sometimes acquire a "Life
Beyond Perl". They get families or new hobbies or even hit by a
bus. (This would be a "Death Beyond Perl".) The fact is, that once
somebody writes a piece of code and shares it with the world, they
are expected to maintain it for all time.
That is being generous. There are others that think that once their
module has become popular or made it into the core, they don't need
to keep fixing and improving it. I have personally been guilty of
this sin.
And then there's the Damian Conway Effect. This plagues the
exceptional authors who are so innovative and prolific they simply
don't have time to maintain everything they have written.
I initially formalized these opinions at the YAPC (Yet Another Perl
Conference) in June 2001. Since then I have been trying to think of
technological solutions to fix these social problems.
One idea was dubbed NAPC. NAPC is CPAN backwards. It is a large system
of precompiled modules that can be installed on the fly, with the goal
of reducing the number of modules in the core. NAPC hasn't got started
yet. I'd still like to do it someday, but it's a big problem with a lot
of issues.
CPAN::MakeMaker (and now Module::Install) on the other hand, is simple
and ultimately flexible. It should work with all of the existing CPAN
processes without requiring any changes from them. And new features can
be continuously added. Even though it doesn't scratch all of my
philosophical CPAN itches, it's a good start.
CONCLUSION
This is all just food for thought. Take it with a pinch of salt.
AUTHOR
Brian Ingerson <INGY@cpan.org>
COPYRIGHT
Copyright (c) 2002. Brian Ingerson.
This document is free documentation; you can redistribute it and/or
modify it under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
perl v5.14.1 2011-04-27 Module::Install::Philosophy(3)
