config_data - Query or change configuration of Perl modules
# 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
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
CPAN::Config), Jon Swartz (
Template::Config), and Larry Wall (perl's own Config.pm)
have developed independently.
The configuration system emplyed here was developed in the context of
Module::Build. Under this system, configuration information for a
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
...::ConfigData modules contain the
configuration data, as well as publically accessible methods for
querying and setting (yes, actually re-writing) the configuration
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
feature values. A
config value may be any perl scalar,
including references to complex data structures. It must, however, be
feature is a boolean (1 or
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
feature values. The following options are
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.
configentry, 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.
featureto the given boolean value. Specify the value as either 1 or 0.
configentry to the given value.
--evaloption is used, the values in
set_configwill 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.
Ken Williams, email@example.com
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.