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Edit File: Config.pod

#
# This is not in Config.pm as MakeMaker can't be convinced to build a
# manpage matching /setup|config/i
#

=head1 NAME

AptPkg::Config - APT configuration interface

=head1 SYNOPSIS

use AptPkg::Config;

=head1 DESCRIPTION

The AptPkg::Config module provides an interface to B<APT>'s
configuration mechanism.

Provides a configuration file and command line parser for a
tree-oriented configuration environment.

=head2 AptPkg::Config

The AptPkg::Config package implements the B<APT> Configuration class.

A global instance of the libapt-pkg _config instance is provided as
$AptPkg::Config::_config, and may be imported.

The following methods are implemented:

=over 4

=item get(I<KEY>, [I<DEFAULT>])

Fetch the value of I<KEY> from the configuration object, returning
undef if not found (or I<DEFAULT> if given).

If the key ends in ::, an array of values is returned in an array
context, or a string containing the values separated by spaces in a
scalar context.

A trailing /f, /d, /b or /i causes file, directory, boolean or integer
interpretation (the underlying XS call is FindAny).

=item get_file(I<KEY>, [I<DEFAULT>]), get_dir(I<KEY>, [I<DEFAULT>])

Variants of get which prepend the directory value from the parent key.
The get_dir method additionally appends a `/'.

For example, given the configuration file:

foo "/some/dir/" { bar "value"; }

then:

$conf->get("foo::bar")	# "value"
    $conf->get_file("foo::bar")	# "/some/dir/value"
    $conf->get_dir("foo::bar")	# "/some/dir/value/"

=item get_bool(I<KEY>, [I<DEFAULT>])

Another get variant, which returns true (1) if the value contains any
of:

1 yes true with on enable

otherwise false ('').

=item set(I<KEY>, I<VALUE>)

Set configuration entry I<KEY> to I<VALUE>.  Returns I<VALUE>.  Note
that empty parent entries may be created for I<KEY>s containing ::.

=item exists(I<KEY>)

Test if I<KEY> exists in the configuration.

=item dump

Principally for debugging, output the contents of the configuration
object to stderr.

=item read_file(I<FILE>, [I<AS_SECTIONAL>, [I<DEPTH>]])

Load the contents of I<FILE> into the object.  The format of the file
is described in apt.conf(5).

If the I<AS_SECTIONAL> argument is true, then the file is parsed as a
BIND-style config.  That is:

foo "bar" { baz "quux"; }

is interpreted as if it were:

foo::bar { baz "quux"; }

The I<DEPTH> argument may be used to restrict the number of nested
include directives processed.

=item read_dir(I<DIR>, [I<AS_SECTIONAL>, [I<DEPTH>]])

Load configuration from all files in I<DIR>.

=item init

Initialise the configuration object with some default values for the
libapt-pkg library and reads the default configuration file
/etc/apt/apt.conf (or as given by the environment variable APT_CONFIG)
if it exists.

=item system

Return the AptPkg::System object appropriate for this system.

=item parse_cmdline(I<DEFS>, [I<ARG>, ...])

Parse the arguments given by I<ARG>s based on the contents of I<DEFS>
and returns the list of remaining arguments.

Note, the function does not return if there are errors processing the
args.  Use eval to trap such errors.

I<DEFS> is a reference to an array containing a set argument
definition arrays.  The elements of each definition define:  the short
argument character, the long argument string, the configuration key
and the optional argument type (defaults to Boolean).

Valid argument types are defined by the strings:

HasArg	takes an argument value (-f foo)
    IntLevel	defines an integer value (-q -q, -qq, -q2, -q=2)
    Boolean	true/false (-d, -d=true, -d=yes, --no-d, -d=false, etc)
    InvBoolean	same as Boolean but false with no specified sense (-d)
    ConfigFile	load the specified configuration file
    ArbItem	arbitrary configuration string of the form key=value

The configuration key in the last two cases is ignored, and for the
rest gives the key into which the value is placed.

Single case equivalents also work (has_arg == HasArg).

Example:

@files = $conf->parse_cmndline([
	    [ 'h', 'help', 'help' ],
	    [ 'v', 'version', 'version' ],
	    [ 'c', 'config-file', '', ConfigFile ],
	    [ 'o', 'option', '', ArbItem ],
	], @ARGV);

=back

The module uses AptPkg::hash to provide a hash-like access to the
object, so that $conf->{key} is equivalent to using the get/set
methods.

Additionally inherits the constructor (new) and keys methods from that
module.

Methods of the internal XS object (AptPkg::_config) such as Find may
also be used.  See AptPkg.

=head2 AptPkg::Config::Iter

Iterator object for AptPkg::Config which is returned by the keys
method.

=over 4

=item new(I<XS_OBJ>, [I<ROOT>])

Constructor, which is invoked by the keys method.  I<ROOT>, if given
determines the subset of the tree to walk (may be given as an argument
to keys).

=item next

Returns the current key and advances to the next.

=back

=head1 SEE ALSO

AptPkg::System(3pm), AptPkg(3pm), AptPkg::hash(3pm).

=head1 AUTHOR

Brendan O'Dea <bod@debian.org>

=cut