NAME
Module::Metadata - Gather package and POD information from perl module files
VERSION
version 1.000038
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 through (mostly) static analysis and (some) code execution. When determining the version of a module, the $VERSION
assignment is eval
ed, as is traditional in the CPAN toolchain.
CLASS METHODS
new_from_file($filename, collect_pod => 1, decode_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.
Alternatively, if decode_pod
is set, it will decode the collected pod sections according to the =encoding
declaration.
new_from_handle($handle, $filename, collect_pod => 1, decode_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, decode_pod => 1)
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
and decode_pod
arguments 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 $module
. A list of directories can be passed in as an optional parameter, otherwise @INC is searched.
Can be called as either an object or a class method.
provides( %options )
This is a convenience wrapper around package_versions_from_directory
to generate a CPAN META provides
data structure. It takes key/value pairs. Valid option keys include:
- version (required)
-
Specifies which version of the CPAN::Meta::Spec should be used as the format of the
provides
output. Currently only '1.4' and '2' are supported (and their format is identical). This may change in the future as the definition ofprovides
changes.The
version
option is required. If it is omitted or if an unsupported version is given, thenprovides
will throw an error. - dir
-
Directory to search recursively for .pm files. May not be specified with
files
. - files
-
Array reference of files to examine. May not be specified with
dir
. - prefix
-
String to prepend to the
file
field of the resulting output. This defaults to lib, which is the common case for most CPAN distributions with their .pm files in lib. This option ensures the META information has the correct relative path even when thedir
orfiles
arguments are absolute or have relative paths from a location other than the distribution root.
For example, given dir
of 'lib' and prefix
of 'lib', the return value is a hashref of the form:
{
'Package::Name' => {
version => '0.123',
file => 'lib/Package/Name.pm'
},
'OtherPackage::Name' => ...
}
package_versions_from_directory($dir, \@files?)
Scans $dir
for .pm files (unless @files
is given, in which case looks for those files in $dir
- and 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 $dir
if that is specified. This must not be used directly for CPAN META provides
. See the provides
method instead.
log_info (internal)
Used internally to perform logging; imported from Log::Contextual if Log::Contextual has already been loaded, otherwise simply calls warn.
OBJECT METHODS
name()
Returns the name of the package represented by this module. If there is more than one package, it makes a best guess based on the filename. If it's a script (i.e. not a *.pm) the package name is 'main'.
version($package)
Returns the version as defined by the $VERSION variable for the package as returned by the name
method if no arguments are given. If given the name of a package it will attempt to return the version of that package if it is specified in the file.
filename()
Returns the absolute path to the file. Note that this file may not actually exist on disk yet, e.g. if the module was read from an in-memory filehandle.
packages_inside()
Returns a list of packages. Note: this is a raw list of packages discovered (or assumed, in the case of main
). It is not filtered for DB
, main
or private packages the way the provides
method does. Invalid package names are not returned, for example "Foo:Bar". Strange but valid package names are returned, for example "Foo::Bar::", and are left up to the caller on how to handle.
pod_inside()
Returns a list of POD sections.
contains_pod()
Returns true if there is any POD in the file.
pod($section)
Returns the POD data in the given section.
is_indexable($package)
or is_indexable()
Available since version 1.000020.
Returns a boolean indicating whether the package (if provided) or any package (otherwise) is eligible for indexing by PAUSE, the Perl Authors Upload Server. Note This only checks for valid package
declarations, and does not take any ownership information into account.
SUPPORT
Bugs may be submitted through the RT bug tracker (or [email protected]).
There is also a mailing list available for users of this distribution, at https://lists.perl.org/list/cpan-workers.html.
There is also an irc channel available for users of this distribution, at #toolchain
on irc.perl.org
.
AUTHOR
Original code from Module::Build::ModuleInfo by Ken Williams <[email protected]>, Randy W. Sims <[email protected]>
Released as Module::Metadata by Matt S Trout (mst) <[email protected]> with assistance from David Golden (xdg) <[email protected]>.
CONTRIBUTORS
Karen Etheridge <[email protected]>
David Golden <[email protected]>
Vincent Pit <[email protected]>
Matt S Trout <[email protected]>
Chris Nehren <[email protected]>
Graham Knop <[email protected]>
Olivier Mengué <[email protected]>
Tomas Doran <[email protected]>
Christian Walde <[email protected]>
Craig A. Berry <[email protected]>
Tatsuhiko Miyagawa <[email protected]>
tokuhirom <[email protected]>
Chris 'BinGOs' Williams <[email protected]>
David Mitchell <[email protected]>
David Steinbrunner <[email protected]>
Edward Zborowski <[email protected]>
Gareth Harper <[email protected]>
James Raspass <[email protected]>
Jerry D. Hedden <[email protected]>
Josh Jore <[email protected]>
Kent Fredric <[email protected]>
Leon Timmermans <[email protected]>
Peter Rabbitson <[email protected]>
Steve Hay <[email protected]>
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.