zotero cookbook

zotero.js

// Add incremental Call Number
let items = Zotero.getActiveZoteroPane().getSelectedItems();
let callNumberLength = items.length.toString().length;
for (i=0; i<items.length; i++) {
  let item = items[i];
  if (!items[i].isRegularItem()) continue;
  item.setField("callNumber", (i+1).toString().padStart(callNumberLength, "0"));
  await item.saveTx();
}

// Rename all PDF attachments
let items = Zotero.getActiveZoteroPane().getSelectedItems();
for (i=0; i<items.length; i++) {
  let item = items[i];
  if (!item.isRegularItem()) continue;
  let attachmentIDs = item.getAttachments();
  for (j=0; j<attachmentIDs.length; j++) {
    let attachmentID = attachmentIDs[j];
    if (!attachmentID) continue;
    let attachment = Zotero.Items.get(attachmentID);
    if (!attachment.isPDFAttachment()) continue;
    // Custom filename
    let callNumber = item.getField("callNumber");
    let title = item.getField("title");
    if (title.length > 50) title = title.substring(0, 50) + "...";
    let year = item.getField("year");
    let newFilename = callNumber + "_" + title + "_" + year + ".pdf";
    // Save changes
    attachment.renameAttachmentFile(newFilename);
    await attachment.saveTx();
  }
}