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Module::ScanDeps(3)   User Contributed Perl Documentation  Module::ScanDeps(3)

NAME
       Module::ScanDeps - Recursively scan Perl code for dependencies

VERSION
       This document describes version 0.55 of Module::ScanDeps, released
       February 17, 2005.

SYNOPSIS
       Via the command-line program scandeps.pl:

	   % scandeps.pl *.pm	       # Print PREREQ_PM section for *.pm
	   % scandeps.pl -e "use utf8" # Read script from command line
	   % scandeps.pl -B *.pm       # Include core modules
	   % scandeps.pl -V *.pm       # Show autoload/shared/data files

       Used in a program;

	   use Module::ScanDeps;

	   # standard usage
	   my $hash_ref = scan_deps(
	       files   => [ 'a.pl', 'b.pl' ],
	       recurse => 1,
	   );

	   # shorthand; assume recurse == 1
	   my $hash_ref = scan_deps( 'a.pl', 'b.pl' );

	   # App::Packer::Frontend compatible interface
	   # see App::Packer::Frontend for the structure returned by get_files
	   my $scan = Module::ScanDeps->new;
	   $scan->set_file( 'a.pl' );
	   $scan->set_options( add_modules => [ 'Test::More' ] );
	   $scan->calculate_info;
	   my $files = $scan->get_files;

DESCRIPTION
       This module scans potential modules used by perl programs, and returns
       a hash reference; its keys are the module names as appears in %INC
       (e.g. "Test/More.pm"); the values are hash references with this struc-
       ture:

	   {
	       file    => '/usr/local/lib/perl5/5.8.0/Test/More.pm',
	       key     => 'Test/More.pm',
	       type    => 'module',    # or 'autoload', 'data', 'shared'
	       used_by => [ 'Test/Simple.pm', ... ],
	   }

       One function, "scan_deps", is exported by default.  Three other func-
       tions ("scan_line", "scan_chunk", "add_deps") are exported upon
       request.

       Users of App::Packer may also use this module as the dependency-check-
       ing frontend, by tweaking their p2e.pl like below:

	   use Module::ScanDeps;
	   ...
	   my $packer = App::Packer->new( frontend => 'Module::ScanDeps' );
	   ...

       Please see App::Packer::Frontend for detailed explanation on the struc-
       ture returned by "get_files".

       scan_deps

	   $rv_ref = scan_deps(
	       files   => \@files,     recurse => $recurse,
	       rv      => \%rv,	       skip    => \%skip,
	       compile => $compile,    execute => $execute,
	   );
	   $rv_ref = scan_deps(@files); # shorthand, with recurse => 1

       This function scans each file in @files, registering their dependencies
       into %rv, and returns a reference to the updated %rv.  The meaning of
       keys and values are explained above.

       If $recurse is true, "scan_deps" will call itself recursively, to per-
       form a breadth-first search on text files (as defined by the -T opera-
       tor) found in %rv.

       If the "\%skip" is specified, files that exists as its keys are
       skipped.	 This is used internally to avoid infinite recursion.

       If $compile or $execute is true, runs "files" in either compile-only or
       normal mode, then inspects their %INC after termination to determine
       additional runtime dependencies.

       If $execute is an array reference, runs the files contained in it
       instead of @files.

       scan_deps_runtime

       Like scan_deps, but skips the static scanning part.

       scan_line

	   @modules = scan_line($line);

       Splits a line into chunks (currently with the semicolon characters),
       and return the union of "scan_chunk" calls of them.

       If the line is "__END__" or "__DATA__", a single "__END__" element is
       returned to signify the end of the program.

       Similarly, it returns a single "__POD__" if the line matches "/^=\w/";
       the caller is responsible for skipping appropriate number of lines
       until "=cut", before calling "scan_line" again.

       scan_chunk

	   $module = scan_chunk($chunk);
	   @modules = scan_chunk($chunk);

       Apply various heuristics to $chunk to find and return the module
       name(s) it contains.  In scalar context, returns only the first module
       or "undef".

       add_deps

	   $rv_ref = add_deps( rv => \%rv, modules => \@modules );
	   $rv_ref = add_deps( @modules ); # shorthand, without rv

       Resolves a list of module names to its actual on-disk location, by
       finding in @INC; modules that cannot be found are skipped.

       This function populates the %rv hash with module/filename pairs, and
       returns a reference to it.

CAVEATS
       This module intentially ignores the BSDPAN hack on FreeBSD -- the addi-
       tional directory is removed from @INC altogether.

       The static-scanning heuristic is not likely to be 100% accurate, espe-
       cially on modules that dynamically load other modules.

       Chunks that span multiple lines are not handled correctly.  For exam-
       ple, this one works:

	   use base 'Foo::Bar';

       But this one does not:

	   use base
	       'Foo::Bar';

SEE ALSO
       scandeps.pl is a bundled utility that writes "PREREQ_PM" section for a
       number of files.

       An application of Module::ScanDeps is to generate executables from
       scripts that contains prerequisite modules; this module supports two
       such projects, PAR and App::Packer.  Please see their respective docu-
       mentations on CPAN for further information.

AUTHORS
       Audrey Tang <autrijus@autrijus.org>

       Parts of heuristics were deduced from:

       o   PerlApp by ActiveState Tools Corp <http://www.activestate.com/>

       o   Perl2Exe by IndigoStar, Inc <http://www.indigostar.com/>

       The scan_deps_runtime function is contributed by Edward S. Peschko.

       <http://par.perl.org/> is the official website for this module.	You
       can write to the mailing list at <par@perl.org>, or send an empty mail
       to <par-subscribe@perl.org> to participate in the discussion.

       Please submit bug reports to <bug-Module-ScanDeps@rt.cpan.org>.

COPYRIGHT
       Copyright 2002, 2003, 2004, 2005, 2006 by Audrey Tang <autrijus@autri-
       jus.org>.

       This program is free software; 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 v5.8.8			  2006-05-19		   Module::ScanDeps(3)
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