function OnInit(initData) {
    initData.name = 'SaveLayoutsAsVars';
    initData.version = '2025-10-03';
    initData.url = 'https://resource.dopus.com/t/cycle-through-layouts/51223';
    initData.default_enable = true;
    initData.min_version = '12.0';
}

function OnActivateLister(activateListerData) {
    if (!activateListerData.active) return;

    var cmd = DOpus.Create().Command();
    var stt = DOpus.Create().StringTools();
    var vec = DOpus.Create().Vector();
    var fsu = DOpus.FSUtil();

    var lst = activateListerData.lister;

    var xmlOrder = fsu.GetItem(fsu.Resolve('/dopusdata\\Layouts\\order.xml'));
    if (!fsu.Exists(xmlOrder)) return;

    var arr = stt.Decode(xmlOrder.Open().Read(), 'utf8').split('\r\n');

    var re = /.*<layout name="(.*)" \/>.*/;

    for (var i = 0; i < arr.length; i++) {
        var tmp = arr[i].match(re);
        if (!tmp) continue;
        if (tmp.length != 2) continue;
        var layoutName = tmp[1];
        var layoutFile = fsu.Resolve('/dopusdata\\Layouts\\' + layoutName + '.oll');
        if (!fsu.Exists(layoutFile)) continue;

        var tmpFile = fsu.OpenFile(layoutFile);
        var xmlText = stt.Decode(tmpFile.Read(), 'utf8');
        tmpFile.Close();
        if (xmlText.indexOf('<lister_layout flags="224">') > 0) continue;  // Layout is hidden

        vec.push_back(layoutName);
    }

    if (vec.empty) return;

    var currLayout = lst.layout;

    var k = 0;
    for (var i = 0; i < vec.length; i++) {
        if (vec[i] != currLayout) continue;
        k = i;
        break;
    }

    var prev = k - 1;
    if (prev < 0) prev = vec.length - 1;

    var next = k + 1;
    if (next == vec.length) next = 0;

    lst.vars.Set('prevLayout', vec[prev]);
    lst.vars.Set('currLayout', currLayout);
    lst.vars.Set('nextLayout', vec[next]);

    cmd.UpdateToggle();
}