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    Perl::Metrics - The Perl Code Metrics System

      # Load or create the metrics database
      use Perl::Metrics '/var/cache/perl/metrics.sqlite';
      # Index and process a directory of code
      Perl::Metrics->process_directory( '/home/adam/code/mycpan' );

    The Perl Code Metrics System is a module which provides a Perl document
    metrics processing engine, and a database in which to store the
    resulting metrics data.

    The intent is to be able to take a large collection of Perl documents,
    and relatively easily parse the files and run a series of processes on
    the documents.

    The resulting data can then be stored, and later used to generate useful
    information about the documents.

  General Structure
    Perl::Metrics consists of two primary components. Firstly, a
    Class::DBI/SQLite database that stores the metrics informationg.

    See Perl::Metrics::File and Perl::Metrics::Metric for the two data
    classes stored in the database.

    Secondly, a plugin structure for creating metrics packages that can
    interoperate with the system, allowing it to take care of document
    processing and data storage while the plugin can concentrate on the
    actual generation of the metrics.

    See Perl::Metrics::Plugin for more information.

  Getting Started
    "Perl::Metrics" comes with on default plugin,
    Perl::Metrics::Plugin::Core, which provides a sampling of metrics.

    To get started load the module, providing the database location as a
    param (it will create it if needed). Then call the "process_directory"
    method, providing it with an absolute path to a directory of Perl code
    on the local filesystem.

    "Perl::Metrics" will quitely sit there working away, and then when it
    finishes you will have a nice database full of metrics data about your

    Of course, how you actually USE that data is up to you, but you can
    query Perl::Metrics::File and Perl::Metrics::Metric for the data just
    like any other Class::DBI database once you have collected it all.

  index_file $absolute_path
    The "index_file" method takes a single absolute file path and creates an
    entry in the "files" index, referencing the file name to its "hex_id"
    for later use.

    Note that this does not execute any metrics on the file, merely allows
    the system to "remember" the file for later.

  index_directory $absolute_path
    As for "index_file", the "index_directory" method will recursively scan
    down a directory tree, locating all Perl files and adding them to the
    file index.

    Returns the number of files added.

    The "process_index" method is the primary method for generating metrics
    data. It triggering a metrics generation pass for all metrics on all
    files currently in the index.

  process_directory $absolute_path
    The "process_directory" method is a convenience method. It runs an
    "index_directory" call for the directory, and then triggers a
    "process_index" call after the index has been populated.

    - Provide a more useful set of default plugins

    - Provide the option to process for a subset of plugins

    - Implemented automatic integration with PPI::Cache

    Bugs should be reported via the CPAN bug tracker at


    For other issues, contact the author.

    Adam Kennedy <>

    Copyright 2005 - 2008 Adam Kennedy.

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

    The full text of the license can be found in the LICENSE file included
    with this module.

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