#!/usr/bin/perl

#
# Example: apt-config in perl.  See apt-config(8).
#

use AptPkg::Config '$_config';

(my $self = $0) =~ s#.*/##;

# initialise the global config object with the default values
$_config->init;

# parse the command line
@ARGV = $_config->parse_cmdline([
	    [ 'h', 'help',        'help' ],
	    [ 'v', 'version',     'version' ],
	    [ 'c', 'config-file', '', 'ConfigFile' ],
	    [ 'o', 'option',      '', 'ArbItem' ],
	], @ARGV);

if (my $v_opt = $_config->get_bool('version') or # --version
    $_config->get_bool('help') or		 # --help
    !@ARGV)					 # no args
{
   # we don't have the PACKAGE/VERSION &c apt-config has... punt
   print "$self (using AptPkg $AptPkg::VERSION, built for ",
	 "$_config->{APT::Architecture})\n";

    print <<EOT unless $v_opt;
Usage: $self [options] command

$self is a simple tool to read the APT config file

Commands:
   shell - Shell mode
   dump - Show the configuration

Options:
  -h   This help text.
  -c=? Read this configuration file
  -o=? Set an arbitrary configuration option, eg -o dir::cache=/tmp
EOT

    exit;
}

# dispatch args
my $op = shift;

if ($op eq 'dump')
{
    $_config->dump;
    exit;
}

die "$self: invalid operation `$op'\n" unless $op eq 'shell';

while (@ARGV)
{
    my $var = shift;
    my $cname = shift or die "$self: arguments not in pairs\n";
    local $_;

    # check if the caller has requested a directory path in the old format
    $cname .= 'd' if $cname =~ m#/$#;

    $_ = $_config->get($cname) if $_config->exists($cname);

    next unless defined;
    if (m#[^\w@+,./:=-]#)
    {
	# quote
	s/'/'\\''/g;
	$_ = "'$_" unless s/^'//;
	$_ = "$_'" unless s/'$//;
    }

    print "$var=$_\n";
}