split

// command to run macro: /macro <name of macro> itemName=<name of item to split>
// command to run macro is cAsE sEnSiTiVe, including name of item!!
// spaces are allowed in the item name
// if you have multiple stacks of the same item, the first stack will be used.

// logic to get item name from chat input
itemName = scope.itemName ? scope.itemName : itemName.name;

console.log("Executed split item stack macro!");

// Ensure exactly one token is selected
if (canvas.tokens.controlled.length === 0) {
  ui.notifications.warn("Please select your token.");
  return;
}
else if (canvas.tokens.controlled.length > 1) {
  ui.notifications.warn("Select only ONE token!");
  return;
}

// assign item to variable & set new name
const item = actor.items.getName(itemName);
const newItemName = itemName + ' (Copy)';
const newItemQuantity = Math.floor(item.system.quantity / 2);

// warn if no item found by name
if (!item) {
  ui.notifications.warn("No item was found with the name \"" + itemName + "\"");
  return;
}

// warn if item quantity is < 2
if (item.system.quantity < 2) {
  ui.notifications.warn("You have fewer than 2 " + itemName + ". A minimum quantity of 2 is required to split a stack.");
  return;
}

// log item object, item name, new item name, original stack quantity, and new stack quantity
console.log('item object: ', item);
console.log('User selected the item: ', itemName, '\nNew item will be named: ', newItemName);
console.log("Original item's quantity: " + item.system.quantity);
console.log("New item quantity will be " + newItemQuantity);

// clone the existing item (creates the new item & assigns it to the newItem variable)
newItem = await item.clone({ name: newItemName, "system.quantity": newItemQuantity}, {save: true});

// if the console doesn't log this message, an error occurred before here
console.log("New item successfully created.");

// reduce original item's quantity to match quantity of new item
await item.update({"system.quantity": item.system.quantity - newItem.system.quantity});

// log new item object
console.log('new item object: ', newItem);
console.log("Finished split item macro!");