Provided by: libdist-metadata-perl_0.926-1_all 
NAME
Dist::Metadata::Dist - Base class for format-specific implementations
VERSION
version 0.926
SYNOPSIS
# don't use this, use a subclass
DESCRIPTION
This is a base class for different dist formats.
The following methods must be defined by subclasses:
• "file_content"
• "find_files"
METHODS
new
Simple constructor that subclasses can inherit. Ensures the presence of
"required_attribute" if defined by the subclass.
default_file_spec
Defaults to 'Native' in the base class which will let File::Spec determine the value.
determine_name_and_version
Some dist formats may define a way to determine the name and version.
determine_packages
$packages = $dist->determine_packages(@files);
Search the specified files (or all files if unspecified) for perl packages.
Extracts the files to a temporary directory if necessary and uses Module::Metadata to
discover package names and versions.
extract_into
$ddir = $dist->extract_into($dir);
($ddir, @dfiles) = $dist->extract_into($dir, @files);
Extracts the specified files (or all files if not specified) into the specified directory.
In list context this returns a list of the directory (which may be a subdirectory of the
$dir passed in) and the files extracted (in native OS (on-disk) format).
In scalar context just the directory is returned.
file_content
Returns the content for the specified file from the dist.
This must be defined by subclasses.
file_checksum
$dist->file_checksum('lib/Mod/Name.pm', 'sha256');
Returns a checksum (hex digest) of the file content.
The Digest module is used to generate the checksums. The value specified should be one
accepted by "Digest->new". A small effort is made to translate simpler names like "md5"
into "MD5" and "sha1" into "SHA-1" (which are the names Digest expects).
If the type of checksum is not specified "md5" will be used.
find_files
Determine the files contained in the dist.
This is called from "list_files" and cached on the object.
This must be defined by subclasses.
file_spec
Returns the OS name of the File::Spec module used for this format. This is mostly so
subclasses can define a specific one (as "default_file_spec") if necessary.
A "file_spec" attribute can be passed to the constructor to override the default.
NOTE: This is used for the internal format of the dist. Tar archives, for example, are
always in unix format. For operations outside of the dist, the format determined by
File::Spec will always be used.
full_path
$dist->full_path("lib/Mod.pm"); # "root-dir/lib/Mod.pm"
Used internally to put the "root" directory back onto the file.
list_files
Returns a list of the files in the dist starting at the dist root.
This calls "find_files" to get a listing of the contents of the dist, determines (and
caches) the root directory (if any), caches and returns the list of files with the root
dir stripped.
@files = $dist->list_files;
# something like qw( README META.yml lib/Mod.pm )
name
The dist name if it could be determined.
packages_from_directory
$provides = $dist->packages_from_directory($dir, @files);
Determines the packages provided by the perl modules found in a directory. This is thin
wrapper around "package_versions_from_directory" in Module::Metadata. It returns a
hashref like "provides" in CPAN::Meta::Spec.
NOTE: $dir must be a physical directory on the disk, therefore @files (if specified) must
be in native OS format. This function is called internally from "determine_packages"
(which calls physical_directory (which calls "extract_into")) which manages these
requirements.
parse_name_and_version
($name, $version) = $dist->parse_name_and_version($path);
Attempt to parse name and version from the provided string. This will work for dists
named like "Dist-Name-1.0".
path_class_dir
Returns the class name used for Path::Class::Dir objects.
path_class_file
Returns the class name used for Path::Class::File objects.
path_classify_dir
This is a shortcut for returning an object representing the provided dir utilizing
"path_class_dir" and "file_spec".
path_classify_file
This is a shortcut for returning an object representing the provided file utilizing
"path_class_file" and "file_spec".
perl_files
Returns the subset of "list_files" that look like perl files. Currently returns anything
matching "/\.pm$/"
TODO: This should probably be customizable.
physical_directory
$dir = $dist->physical_directory();
($dir, @dir_files) = $dist->physical_directory(@files);
Returns the path to a physical directory on the disk where the specified files (if any)
can be found.
For in-memory formats this will make a temporary directory and write the specified files
(or all files) into it.
The return value is the same as "extract_into": In scalar context the path to the
directory is returned. In list context the (possibly adjusted) paths to any specified
files are appended to the return value.
remove_root_dir
my ($dir, @rel) = $dm->remove_root_dir(@files);
If all the @files are beneath the same root directory (as is normally the case) this will
strip the root directory off of each file and return a list of the root directory and the
stripped files.
If there is no root directory the first element of the list will be "undef".
required_attribute
A single attribute that is required by the class. Subclasses can define this to make
"new" "croak" if it isn't present.
root
Returns the root directory of the dist (if there is one).
set_name_and_version
This is a convenience method for setting the name and version if they haven't already been
set. This is often called by "determine_name_and_version".
version
Returns the version if it could be determined from the dist.
SEE ALSO
• Dist::Metadata::Tar - for examining a tar file
• Dist::Metadata::Dir - for a directory already on the disk
• Dist::Metadata::Struct - for mocking up a dist with perl data structures
AUTHOR
Randy Stauner <rwstauner@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2011 by Randy Stauner.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.