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Let's assume you have a recent Perl and CPANPLUS installed. You want your brand new script to automatically install any modules that are not found. Well, maybe you don't. I'm sure I don't, but I couldn't resist the temptation and made Blah.pm. The module name describes exactly what it does, or... no it doesn't... but I needed a name.

My first try had a $SIG{__DIE__} handler and die "Try again :)\n", but it still didn't look nice. I did this because you cannot resurrect scripts. Kane had the idea of using exec($^X, $0, @ARGV) instead, which worked perfectly. But then, lathos suggested using a code ref in @INC. With the help of this node, I created this:

Blah.pm

use strict; use CPANPLUS; push @INC, sub { my ($code, $file) = @_; my $module = $file; $module =~ s!/!::!g; $module =~ s!\.pm$!!g; install($module); for (@INC) { next if ref; if (-e "$_/$file" and -r _) { open my $fh, '<', "$_/$file" or die $!; return $fh; } } return undef; };
Please note that real programmers don't use CPANPLUS but CPANPLUS::Backend, and use the great backend. I was lazy and used CPANPLUS with the simple install() function, but that is bad.

Example script:

use Blah; use Acme::Time::Baby; print babytime(), "\n";

Example output:

3;0 root@ouranos:/home/juerd/modtest# perl test.pl Checking if your kit is complete... Looks good Writing Makefile for Acme::Time::Baby PERL_DL_NONLAZY=1 /usr/bin/perl -Iblib/arch -Iblib/lib -I/usr/lib/perl +/5.6.1 -I/ usr/share/perl/5.6.1 -e 'use Test::Harness qw(&runtests $verbose); $ve +rbose=(eva l(chr(36).q(|=1))-1); runtests @ARGV;' t/*.t t/00_en..........ok t/01_du..........ok t/02_custom......ok t/03_noimport....ok t/04_chef........ok t/05_warez.......ok t/06_de..........ok t/07_fr..........ok t/08_no..........ok t/09_it..........ok All tests successful. Files=10, Tests=12972, 6 wallclock secs ( 2.33 cusr + 0.17 csys = 2 +.50 CPU) Installing of Acme::Time::Baby succesfull The big hand is on the eight and the little hand is on the ten 3;0 root@ouranos:/home/juerd/modtest# perl test.pl The big hand is on the nine and the little hand is on the ten

- Yes, I reinvent wheels.
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In reply to Automatic module installation by Juerd

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