// ==UserScript==
// @name           carrefour per unit price sorter
// @name:pl        carrefour sortowanie po cenie jednostki
// @namespace      cprn
// @license        GPLv3
// @match          https://*.carrefour.pl/*
// @grant          none
// @version        0.2
// @author         cprn
// @run-at         document-idle
// @date           2024-07-18 00:34:09
// @description    Sorts items by price per unit (e.g. `per kg` or `per litre`) in Carrefour online shops in Poland.
// @description:pl Sortuje produkty po cenie za jednostkę (np. za `kg` albo `l`) w sklepie internetowym polskiego Carrefoura.
// ==/UserScript==
console.debug('cprn: start')
function discoverClasses () {
let priceTag = null;
['zł/1 l', 'zł/1 kg'].every(s => {
let xpath = ''.concat("//p[contains(., '", s, "')]");
priceTag = document.evaluate(xpath, document, null, XPathR###lt.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
// console.log('priceTag', priceTag);
return priceTag === null;
});
return {
item: priceTag.parentNode.parentNode.parentNode.parentNode.classList[0],
perUnitStrip:     priceTag.parentNode.classList[0],
mass:      priceTag.parentNode.children[0].classList[0],
perMass:      priceTag.parentNode.previousSibling.children[0].children[0].classList[0],
};
}
const classes = discoverClasses();
const firstItem = document.getElementsByClassName(classes.item)[0];
console.debug('[discovered classes]\n--------------------\n' +
'item: ' + classes.item, document.getElementsByClassName(classes.item)[0], '\n' +
'perUnitStrip: ' + classes.perUnitStrip, document.getElementsByClassName(classes.perUnitStrip)[0], '\n' +
'mass: ' + classes.mass, document.getElementsByClassName(classes.mass)[0], '\n' +
'perMass: ' + classes.perMass, document.getElementsByClassName(classes.perMass)[0], '\n' +
'perUnit: ', perUnitPrice(firstItem)
);
function perUnitPrice (e) {
let perUnit = e.getElementsByClassName(classes.perUnitStrip)[0].lastChild;
let perMass = e.getElementsByClassName(classes.perMass)[0];
let mass = e.getElementsByClassName(classes.mass)[0].lastChild;
if (mass.innerText == '1 szt.' || perUnit === undefined) {
console.debug('unknown price', e);
return .0;
} else if (mass.innerText == '1 l' || mass.innerText == '1 kg') {
price = ''.concat(perMass.children[0].innerText, '.', perMass.children[1].innerText)
} else {
price = perUnit.innerText.slice(0, -7).replace(',', '.');
}
return parseFloat(price)
}
function sortItems () {
console.debug('sorting...');
[...firstItem.parentNode.children]
.sort((a, b) => perUnitPrice(a) > perUnitPrice(b) ? 1 : -1 )
.forEach(e => firstItem.parentNode.appendChild(e))
console.debug('sorting done');
}
window.sortItems = sortItems;
// window.addEventListener('load', sortItems, false)
// setTimeout(sortItems, 300)
// setTimeout(sortItems, 600)
// setTimeout(sortItems, 900)
setTimeout(sortItems, 2000)
console.debug('cprn: done')