NAME

       config_data - Query or change configuration of Perl modules

SYNOPSIS

         # Get config/feature values
         config_data --module Foo::Bar --feature bazzable
         config_data --module Foo::Bar --config magic_number

         # Set config/feature values
         config_data --module Foo::Bar --set_feature bazzable=1
         config_data --module Foo::Bar --set_config magic_number=42

         # Print a usage message
         config_data --help

DESCRIPTION

       The "config_data" tool provides a command-line interface to the configuration of Perl
       modules.  By "configuration", we mean something akin to "user preferences" or "local
       settings".  This is a formalization and abstraction of the systems that people like
       Andreas Koenig ("CPAN::Config"), Jon Swartz ("HTML::Mason::Config"), Andy Wardley
       ("Template::Config"), and Larry Wall (perl's own Config.pm) have developed independently.

       The configuration system employed here was developed in the context of "Module::Build".
       Under this system, configuration information for a module "Foo", for example, is stored in
       a module called "Foo::ConfigData") (I would have called it "Foo::Config", but that was
       taken by all those other systems mentioned in the previous paragraph...).  These
       "...::ConfigData" modules contain the configuration data, as well as publicly accessible
       methods for querying and setting (yes, actually re-writing) the configuration data.  The
       "config_data" script (whose docs you are currently reading) is merely a front-end for
       those methods.  If you wish, you may create alternate front-ends.

       The two types of data that may be stored are called "config" values and "feature" values.
       A "config" value may be any perl scalar, including references to complex data structures.
       It must, however, be serializable using "Data::Dumper".  A "feature" is a boolean (1 or 0)
       value.

USAGE

       This script functions as a basic getter/setter wrapper around the configuration of a
       single module.  On the command line, specify which module's configuration you're
       interested in, and pass options to get or set "config" or "feature" values.  The following
       options are supported:

       module
           Specifies the name of the module to configure (required).

       feature
           When passed the name of a "feature", shows its value.  The value will be 1 if the
           feature is enabled, 0 if the feature is not enabled, or empty if the feature is
           unknown.  When no feature name is supplied, the names and values of all known features
           will be shown.

       config
           When passed the name of a "config" entry, shows its value.  The value will be
           displayed using "Data::Dumper" (or similar) as perl code.  When no config name is
           supplied, the names and values of all known config entries will be shown.

       set_feature
           Sets the given "feature" to the given boolean value.  Specify the value as either 1 or
           0.

       set_config
           Sets the given "config" entry to the given value.

       eval
           If the "--eval" option is used, the values in "set_config" will be evaluated as perl
           code before being stored.  This allows moderately complicated data structures to be
           stored.  For really complicated structures, you probably shouldn't use this command-
           line interface, just use the Perl API instead.

       help
           Prints a help message, including a few examples, and exits.

AUTHOR

       Ken Williams, kwilliams@cpan.org

COPYRIGHT

       Copyright (c) 1999, Ken Williams.  All rights reserved.

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

SEE ALSO

       Module::Build(3), perl(1).