home *** CD-ROM | disk | FTP | other *** search
- #!/usr/bin/perl
- eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
- if $running_under_some_shell;
- #!/usr/bin/perl
-
- use strict;
- use Module::Build 0.25;
- use Getopt::Long;
-
- my %opt_defs = (
- module => {type => '=s',
- desc => 'The name of the module to configure (required)'},
- feature => {type => ':s',
- desc => 'Print the value of a feature or all features'},
- config => {type => ':s',
- desc => 'Print the value of a config option'},
- set_feature => {type => '=s%',
- desc => "Set a feature to 'true' or 'false'"},
- set_config => {type => '=s%',
- desc => 'Set a config option to the given value'},
- eval => {type => '',
- desc => 'eval() config values before setting'},
- help => {type => '',
- desc => 'Print a help message and exit'},
- );
-
- my %opts;
- GetOptions( \%opts, map "$_$opt_defs{$_}{type}", keys %opt_defs ) or die usage(%opt_defs);
- print usage(%opt_defs) and exit(0)
- if $opts{help};
-
- my @exclusive = qw(feature config set_feature set_config);
- die "Exactly one of the options '" . join("', '", @exclusive) . "' must be specified\n" . usage(%opt_defs)
- unless grep(exists $opts{$_}, @exclusive) == 1;
-
- die "Option --module is required\n" . usage(%opt_defs)
- unless $opts{module};
-
- my $cf = load_config($opts{module});
-
- if (exists $opts{feature}) {
-
- if (length $opts{feature}) {
- print $cf->feature($opts{feature});
- } else {
- my %auto;
- # note: need to support older ConfigData.pm's
- @auto{$cf->auto_feature_names} = () if $cf->can("auto_feature_names");
-
- print " Features defined in $cf:\n";
- foreach my $name (sort $cf->feature_names) {
- print " $name => ", $cf->feature($name), (exists $auto{$name} ? " (dynamic)" : ""), "\n";
- }
- }
-
- } elsif (exists $opts{config}) {
-
- require Data::Dumper;
- local $Data::Dumper::Terse = 1;
-
- if (length $opts{config}) {
- print Data::Dumper::Dumper($cf->config($opts{config})), "\n";
- } else {
- print " Configuration defined in $cf:\n";
- foreach my $name (sort $cf->config_names) {
- print " $name => ", Data::Dumper::Dumper($cf->config($name)), "\n";
- }
- }
-
- } elsif (exists $opts{set_feature}) {
- my %to_set = %{$opts{set_feature}};
- while (my ($k, $v) = each %to_set) {
- die "Feature value must be 0 or 1\n" unless $v =~ /^[01]$/;
- $cf->set_feature($k, 0+$v); # Cast to a number, not a string
- }
- $cf->write;
- print "Feature" . 's'x(keys(%to_set)>1) . " saved\n";
-
- } elsif (exists $opts{set_config}) {
-
- my %to_set = %{$opts{set_config}};
- while (my ($k, $v) = each %to_set) {
- if ($opts{eval}) {
- $v = eval($v);
- die $@ if $@;
- }
- $cf->set_config($k, $v);
- }
- $cf->write;
- print "Config value" . 's'x(keys(%to_set)>1) . " saved\n";
- }
-
- sub load_config {
- my $mod = shift;
-
- $mod =~ /^([\w:]+)$/
- or die "Invalid module name '$mod'";
-
- my $cf = $mod . "::ConfigData";
- eval "require $cf";
- die $@ if $@;
-
- return $cf;
- }
-
- sub usage {
- my %defs = @_;
-
- my $out = "\nUsage: $0 [options]\n\n Options include:\n";
-
- foreach my $name (sort keys %defs) {
- $out .= " --$name";
-
- for ($defs{$name}{type}) {
- /^=s$/ and $out .= " <string>";
- /^=s%$/ and $out .= " <string>=<value>";
- }
-
- pad_line($out, 35);
- $out .= "$defs{$name}{desc}\n";
- }
-
- $out .= <<EOF;
-
- Examples:
- $0 --module Foo::Bar --feature bazzable
- $0 --module Foo::Bar --config magic_number
- $0 --module Foo::Bar --set_feature bazzable=1
- $0 --module Foo::Bar --set_config magic_number=42
-
- EOF
-
- return $out;
- }
-
- sub pad_line { $_[0] .= ' ' x ($_[1] - length($_[0]) + rindex($_[0], "\n")) }
-
-
- __END__
-
- =head1 NAME
-
- config_data - Query or change configuration of Perl modules
-
- =head1 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
-
- =head1 DESCRIPTION
-
- The C<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 (C<CPAN::Config>), Jon Swartz (C<HTML::Mason::Config>), Andy
- Wardley (C<Template::Config>), and Larry Wall (perl's own Config.pm)
- have developed independently.
-
- The configuration system emplyed here was developed in the context of
- C<Module::Build>. Under this system, configuration information for a
- module C<Foo>, for example, is stored in a module called
- C<Foo::ConfigData>) (I would have called it C<Foo::Config>, but that
- was taken by all those other systems mentioned in the previous
- paragraph...). These C<...::ConfigData> modules contain the
- configuration data, as well as publically accessible methods for
- querying and setting (yes, actually re-writing) the configuration
- data. The C<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 C<config> values
- and C<feature> values. A C<config> value may be any perl scalar,
- including references to complex data structures. It must, however, be
- serializable using C<Data::Dumper>. A C<feature> is a boolean (1 or
- 0) value.
-
- =head1 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 C<config> or C<feature> values. The following options are
- supported:
-
- =over 4
-
- =item module
-
- Specifies the name of the module to configure (required).
-
- =item feature
-
- When passed the name of a C<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.
-
- =item config
-
- When passed the name of a C<config> entry, shows its value. The value
- will be displayed using C<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.
-
- =item set_feature
-
- Sets the given C<feature> to the given boolean value. Specify the value
- as either 1 or 0.
-
- =item set_config
-
- Sets the given C<config> entry to the given value.
-
- =item eval
-
- If the C<--eval> option is used, the values in C<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.
-
- =item help
-
- Prints a help message, including a few examples, and exits.
-
- =back
-
- =head1 AUTHOR
-
- Ken Williams, kwilliams@cpan.org
-
- =head1 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.
-
- =head1 SEE ALSO
-
- Module::Build(3), perl(1).
-
- =cut
-