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



NAME
       Module::Metadata - Gather package and POD information from perl module files

SYNOPSIS
         use Module::Metadata;

         # information about a .pm file
         my $info = Module::Metadata->new_from_file( $file );
         my $version = $info->version;

         # CPAN META 'provides' field for .pm files in a directory
         my $provides = Module::Metadata->provides(
           dir => 'lib', version => 2
         );

DESCRIPTION
       This module provides a standard way to gather metadata about a .pm file without executing unsafe
       code.

USAGE
   Class methods
       "new_from_file($filename, collect_pod => 1)"
           Constructs a "Module::Metadata" object given the path to a file.  Returns undef if the filename
           does not exist.

           "collect_pod" is a optional boolean argument that determines whether POD data is collected and
           stored for reference.  POD data is not collected by default.  POD headings are always collected.

           If the file begins by an UTF-8, UTF-16BE or UTF-16LE byte-order mark, then it is skipped before
           processing, and the content of the file is also decoded appropriately starting from perl 5.8.

       "new_from_handle($handle, $filename, collect_pod => 1)"
           This works just like "new_from_file", except that a handle can be provided as the first argument.

           Note that there is no validation to confirm that the handle is a handle or something that can act
           like one.  Passing something that isn't a handle will cause a exception when trying to read from
           it.  The "filename" argument is mandatory or undef will be returned.

           You are responsible for setting the decoding layers on $handle if required.

       "new_from_module($module, collect_pod => 1, inc => \@dirs)"
           Constructs a "Module::Metadata" object given a module or package name.  Returns undef if the
           module cannot be found.

           In addition to accepting the "collect_pod" argument as described above, this method accepts a
           "inc" argument which is a reference to an array of directories to search for the module.  If none
           are given, the default is @INC.

           If the file that contains the module begins by an UTF-8, UTF-16BE or UTF-16LE byte-order mark,
           then it is skipped before processing, and the content of the file is also decoded appropriately
           starting from perl 5.8.

       "find_module_by_name($module, \@dirs)"
           Returns the path to a module given the module or package name. A list of directories can be
           passed in as an optional parameter, otherwise @INC is searched.

           Can be called as either an object or a class method.

       "find_module_dir_by_name($module, \@dirs)"
           Returns the entry in @dirs (or @INC by default) that contains the module $module. A list of
           directories can be passed in as an optional parameter, otherwise @INC is searched.

           Can be called as either an object or a class method.

       "provides( %options )"
           This is a convenience wrapper around "package_versions_from_directory" to generate a CPAN META
           "provides" data structure.  It takes key/value pairs.  Valid option keys include:

           version (required)
               Specifies which version of the CPAN::Meta::Spec should be used as the format of the
               "provides" output.  Currently only '1.4' and '2' are supported (and their format is
               identical).  This may change in the future as the definition of "provides" changes.

               The "version" option is required.  If it is omitted or if an unsupported version is given,
               then "provides" will throw an error.

           dir Directory to search recursively for .pm files.  May not be specified with "files".

           files
               Array reference of files to examine.  May not be specified with "dir".

           prefix
               String to prepend to the "file" field of the resulting output. This defaults to lib, which is
               the common case for most CPAN distributions with their .pm files in lib.  This option ensures
               the META information has the correct relative path even when the "dir" or "files" arguments
               are absolute or have relative paths from a location other than the distribution root.

           For example, given "dir" of 'lib' and "prefix" of 'lib', the return value is a hashref of the
           form:

             {
               'Package::Name' => {
                 version => '0.123',
                 file => 'lib/Package/Name.pm'
               },
               'OtherPackage::Name' => ...
             }

       "package_versions_from_directory($dir, \@files?)"
           Scans $dir for .pm files (unless @files is given, in which case looks for those files in $dir -and $dirand
           and reads each file for packages and versions, returning a hashref of the form:

             {
               'Package::Name' => {
                 version => '0.123',
                 file => 'Package/Name.pm'
               },
               'OtherPackage::Name' => ...
             }

           The "DB" and "main" packages are always omitted, as are any "private" packages that have leading
           underscores in the namespace (e.g.  "Foo::_private")

           Note that the file path is relative to $dir if that is specified.  This must not be used directly
           for CPAN META "provides".  See the "provides" method instead.

       "log_info (internal)"
           Used internally to perform logging; imported from Log::Contextual if Log::Contextual has already
           been loaded, otherwise simply calls warn.

   Object methods
       "name()"
           Returns the name of the package represented by this module. If there are more than one packages,
           it makes a best guess based on the filename. If it's a script (i.e. not a *.pm) the package name
           is 'main'.

       "version($package)"
           Returns the version as defined by the $VERSION variable for the package as returned by the "name"
           method if no arguments are given. If given the name of a package it will attempt to return the
           version of that package if it is specified in the file.

       "filename()"
           Returns the absolute path to the file.

       "packages_inside()"
           Returns a list of packages. Note: this is a raw list of packages discovered (or assumed, in the
           case of "main").  It is not filtered for "DB", "main" or private packages the way the "provides"
           method does.

       "pod_inside()"
           Returns a list of POD sections.

       "contains_pod()"
           Returns true if there is any POD in the file.

       "pod($section)"
           Returns the POD data in the given section.

AUTHOR
       Original code from Module::Build::ModuleInfo by Ken Williams <kwilliams@cpan.org>, Randy W. Sims
       <RandyS@ThePierianSpring.org>

       Released as Module::Metadata by Matt S Trout (mst) <mst@shadowcat.co.uk> with assistance from David
       Golden (xdg) <dagolden@cpan.org>.

COPYRIGHT & LICENSE
       Original code Copyright (c) 2001-2011 Ken Williams.  Additional code Copyright (c) 2010-2011 Matt
       Trout and David Golden.  All rights reserved.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.



perl v5.16.2                                     2012-08-16                              Module::Metadata(3)