update( $plugins )

update index . $plugins is a hashref contains :

'rsl.vim' => {
    'downloads' => '408',
    'script'    => {
        'link' => 'script.php?script_id=1297',
        'text' => 'rsl.vim'
    },
    'summary' => {
        'link' => 'script.php?script_id=1297',
        'text' => 'Basic syntax for RSL (droidarena.net).'
    },
    'type'      => 'syntax',
    'script_id' => '1297',
    'rating'    => '2'
}

read_index

read_index return package informations , which is a hashref

{
    plugin_name => {
        plugin_name => 
        script_id   => 
        type        => 
        description => 
    },

    plugin_name => {
        plugin_name => 
        script_id   => 
        type        => 
        description => 
    },
}