function OnInit(initData) {
    initData.name = "PDF pages";
    initData.desc = "Column to display the number of pages in PDF files";
    initData.version = "1.0";
    initData.copyright = "(c) 2025 DASOTA";
    initData.default_enable = true;
}

function OnAddColumns(addColData) {
    var col = addColData.AddColumn();
    col.name = "PDFpages";
    col.label = "PDF pages";
    col.justify = "right";
    col.autorefresh = true;
    col.type = "number";
    col.method = "OnGet";
}

function OnGet(getData) {
    var item = getData.item;

    var ext = item.ext ? item.ext.toLowerCase() : "";
    if (ext !== ".pdf") {
        getData.value = "";
        return;
    }

    var shell = new ActiveXObject("WScript.Shell");
    var pdfinfoPath = "C:\\Poppler\\Library\\bin\\pdfinfo.exe"; // Path to the pdfinfo.exe file

    try {
        var exec = shell.Exec('"' + pdfinfoPath + '" "' + item.realpath + '"');
        var pages = "";
        while (!exec.StdOut.AtEndOfStream) {
            var line = exec.StdOut.ReadLine();
            if (line.match(/^Pages:\s*(\d+)/i)) {
                pages = RegExp.$1;
                break;
            }
        }
        getData.value = pages;
    } catch (e) {
        getData.value = "";
    }
}