###################################################################### CPAN::Unwind 0.04 ###################################################################### NAME CPAN::Unwind - Recursively determines dependencies of CPAN modules SYNOPSIS use CPAN::Unwind; my $agent = CPAN::Unwind->new(); my $resp = $agent->lookup("Log::Log4perl"); die $resp->message() unless $resp->is_success(); my $deps = $resp->dependent_versions(); for my $module (keys %$deps) { printf "%30s: %s\n", $module, $deps->{$module}; } # Prints: # # Test::Harness: 2.03 # Test::More: 0.45 # File::Spec: 0.82 # File::Basename: 0 # Carp: 0 print "Installation schedule:\n"; for($resp->schedule()) { print "$_\n"; } # Installation schedule: # Carp # File::Basename # File::Spec # Test::Harness # Test::More # Log::Log4perl DESCRIPTION CPAN::Unwind recursively determines dependencies of CPAN modules. It fetches distribution tarballs from CPAN, unpacks them, and runs Module::Depends::Intrusive on them. SECURITY NOTE: CPAN::Unwind runs all Makefile.PL files (via "Module::Depends::Intrusive") of modules it finds dependencies on. If you are concerned that any module in the dependency tree on CPAN isn't trustworthy, don't use it. METHODS CPAN::Unwind supports the following methods: "my $agent = CPAN::Unwind->new();" Create a new dependency agent. The following options are supported: "cache" Provide your own "Cache::Cache" object (see *Caching*). "add" Provide additional dependencies that should be part of the result: CPAN::Unwind->new(add => ["Foo", "Bar" => 0.17, ... ]); indicates that "Foo" has a dependency on "Bar" 0.17, even if it's not listed in "Foo"'s "Makefile.PL". This way, you can fix broken Makefile.PL files of some CPAN modules, not listing their dependencies correctly. "$resp = $agent->lookup_single($module_name)" Goes to CPAN and fetches the tarball containing the module specified in $module_name. After unpacking the tarball, it will use Module::Depends::Intrusive to determine the modules it depends on. Returns a "CPAN::Unwind::Response" object. "$resp = $agent->lookup($module_name)" Calls "lookup_single" on $module_name recursively, builds a dependency tree and returns a "CPAN::Unwind::Response" object containing a consolidated dependency tree. CPAN::Unwind::Response supports the following methods: "$resp->is_success()" Returns true if there's a valid response and no error occurred. "$resp->message()" Returns a response's error message in case "is_success()" returned a false value. "$resp->dependent_versions()" Returns a ref to a hash, containing a mapping between names of dependent modules and their version numbers: { "Test::More" => 0.51, "List::Utils" => 0.38, ... } "$resp->missing()" Similar to "dependent_versions()", but only modules that are currently *not* installed are returned. "$resp->dependents()" Returns a ref to a hash, mapping module names to their dependencies. { "Net::Amazon" => ["Log::Log4perl", "XML::Simple"], "List::Utils" => [], ... } If an entry holds a ref to an empty array, the module doesn't have any dependencies. "$resp->schedule()" Returns an installation schedule, a list of module names in the correct order without dependency conflicts. Returns "undef" if no schedule can be made due to circular dependencies. Caching To avoid costly downloads, "CPAN::Unwind" will cache dependencies in a Cache::FileCache cache, where they are stored indefinitely. Running it the second time on a module will speed up processing significantly. Turnkey Scripts "CPAN::Unwind" comes with a ready-to-use script "cpan-unwind", which gets installed in perl's bin path. It is ready to use, just call $ cpan-unwind Log::Log4perl to see which modules "Log::Log4perl" depends on. "CPAN::Unwind" requires a valid CPAN configuration. EXAMPLES $ cpan-unwind Net::Amazon Carp Compress::Zlib Data::Dumper Fcntl File::Basename File::Path File::Spec HTML::Tagset IO::Socket MIME::Base64 Socket Test::Harness Test::More Test::Simple Time::HiRes URI XML::NamespaceSupport Digest::base File::Temp HTML::Parser Log::Log4perl Net::FTP XML::SAX XML::Simple Digest::MD5 LWP::UserAgent Net::Amazon LEGALESE Copyright 2005 by Mike Schilli, all rights reserved. This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself. AUTHOR 2005, Mike Schilli