FreshRSS Duplicate Filter

Mark as read and hide older articles in the FreshRSS feed list that have the same title, URL and content within a category or feed.
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// ==UserScript==
// @name        FreshRSS Duplicate Filter
// @namespace   https://github.com/hiroki-miya
// @version     1.0.3
// @description Mark as read and hide older articles in the FreshRSS feed list that have the same title, URL and content within a category or feed.
// @author      hiroki-miya
// @license     MIT
// @match       https://freshrss.example.net/*
// @grant       GM_addStyle
// @grant       GM_getValue
// @grant       GM_registerMenuCommand
// @grant       GM_setValue
// @grant       GM_xmlhttpRequest
// @run-at      document-idle
// ==/UserScript==
 
(function() {
    'use strict';
 
    // Default settings
    const DEFAULT_CATEGORY_LIST = [];
    const DEFAULT_CHECK_LIMIT = 100;
 
    // Load saved settings
    let selectedCategories = GM_getValue('selectedCategories', DEFAULT_CATEGORY_LIST);
    let checkLimit = GM_getValue('checkLimit', DEFAULT_CHECK_LIMIT);
 
    // Add styles
    GM_addStyle(`
        #freshrss-duplicate-filter {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 10000;
            background-color: white;
            border: 1px solid black;
            padding: 10px;
            width: max-content;
        }
        #freshrss-duplicate-filter > h2 {
            box-shadow: inset 0 0 0 0.5px black;
            padding: 5px 10px;
            text-align: center;
            cursor: move;
        }
        #freshrss-duplicate-filter > h4 {
            margin-top: 0;
        }
        #fdfs-categories {
            margin-bottom: 10px;
            max-height: 60vh;
            overflow-y: auto;
        }
    `);
 
    // Settings screen
    function showSettings() {
        const categories = Array.from(document.querySelectorAll('#sidebar a > span.title')).map(cat => cat.innerText);
        const selected = selectedCategories || [];
 
        let categoryOptions = categories.map(cat => {
            const checked = selected.includes(cat) ? 'checked' : '';
            return `<label><input type="checkbox" value="${cat}" ${checked}> ${cat}</label>`;
        }).join('');
 
        const limitInput = `<label>Check Limit: <input type="number" id="checkLimit" value="${checkLimit}" min="1"></label>`;
 
        const settingsHTML = `
                <h2>Duplicate Filter Settings</h2>
                <h4>Select category or feed</h4>
                <div id="fdfs-categories">${categoryOptions}</div>
                ${limitInput}
                <br>
                <button id="fdfs-save">Save</button>
                <button id="fdfs-close">Close</button>
        `;
 
        const settingsDiv = document.createElement('div');
        settingsDiv.id = "freshrss-duplicate-filter";
        settingsDiv.innerHTML = settingsHTML;
        document.body.appendChild(settingsDiv);
 
        // Make settings panel draggable
        makeDraggable(settingsDiv);
 
        // Save button event
        document.getElementById('fdfs-save').addEventListener('click', () => {
            const selectedCheckboxes = Array.from(document.querySelectorAll('input[type="checkbox"]:checked')).map(el => el.value);
            const newLimit = parseInt(document.getElementById('checkLimit').value, 10);
 
            GM_setValue('selectedCategories', selectedCheckboxes);
            GM_setValue('checkLimit', newLimit);
 
            showTooltip('Saved');
 
            // Mark duplicates as read after saving
            markDuplicatesAsRead();
        });
 
        // Close button event
        document.getElementById('fdfs-close').addEventListener('click', () => {
            document.body.removeChild(settingsDiv);
        });
    }
 
    // Register settings screen
    GM_registerMenuCommand('Settings', showSettings);
 
    // Function to display the tooltip
    function showTooltip(message) {
        // Create the tooltip element
        const tooltip = document.createElement('div');
        tooltip.textContent = message;
        tooltip.style.position = 'fixed';
        tooltip.style.top = '50%';
        tooltip.style.left = '50%';
        tooltip.style.transform = 'translate(-50%, -50%)';
        tooltip.style.backgroundColor = 'rgba(0, 0, 0, 0.75)';
        tooltip.style.color = 'white';
        tooltip.style.padding = '10px 20px';
        tooltip.style.borderRadius = '5px';
        tooltip.style.zIndex = '10000';
        tooltip.style.fontSize = '16px';
        tooltip.style.textAlign = 'center';
 
        // Add the tooltip to the page
        document.body.appendChild(tooltip);
 
        // Automatically remove the tooltip after 1 second
        setTimeout(() => {
            document.body.removeChild(tooltip);
        }, 1000);
    }
 
    // Make element draggable
    function makeDraggable(elmnt) {
        const header = elmnt.querySelector('h2');
        let pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
        header.onmousedown = dragMouseDown;
 
        function dragMouseDown(e) {
            e = e || window.event;
            e.preventDefault();
            // Get the mouse cursor position at startup:
            pos3 = e.clientX;
            pos4 = e.clientY;
            document.onmouseup = closeDragElement;
            document.onmousemove = elementDrag;
        }
 
        function elementDrag(e) {
            e = e || window.event;
            e.preventDefault();
            // Calculate the new cursor position:
            pos1 = pos3 - e.clientX;
            pos2 = pos4 - e.clientY;
            pos3 = e.clientX;
            pos4 = e.clientY;
            // Set the element's new position:
            elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
            elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
        }
 
        function closeDragElement() {
            document.onmouseup = null;
            document.onmousemove = null;
        }
    }
 
    // Mark as read and hide articles
    function markAsDuplicate(articleElement) {
        if (!articleElement) return;
 
        // Check if mark_read function is available
        if (typeof mark_read === 'function') {
            mark_read(articleElement, true, true);
        } else {
            // Fallback: manually add 'read' class and trigger 'read' event
            articleElement.classList.add('read');
            const event = new Event('read');
            articleElement.dispatchEvent(event);
        }
 
        // Hide the article
        articleElement.remove();
    }
 
    // Check for duplicate articles and mark older ones as read
    function markDuplicatesAsRead() {
        const articles = Array.from(document.querySelectorAll('#stream > .flux'));
        const articleMap = new Map();
 
        articles.slice(-checkLimit).forEach(article => {
            const titleElement = article.querySelector('a.item-element.title');
            if (!titleElement) return;
 
            const title = titleElement.innerText;
            const url = titleElement.href;
            const timeElement = article.querySelector('.date > time');
            if (!timeElement) return;
 
            const articleData = { element: article, timestamp: new Date(timeElement.datetime).getTime() };
 
            // Duplicate check
            if (articleMap.has(title)) {
                const existingArticle = articleMap.get(title);
                if (existingArticle.url === url) {
                    const older = existingArticle.timestamp < articleData.timestamp ? existingArticle : articleData;
 
                    // Mark older articles as duplicates
                    markAsDuplicate(older.element);
                }
            } else {
                articleMap.set(title, { ...articleData, url });
            }
        });
    }
 
 
    // Get the current category
    function getCurrentCategory() {
        const categoryElement = document.querySelector('.category.active > ul > li.active > a > span.title');
        if (categoryElement) {
            return categoryElement.innerText;
        } else {
            const categoryElement_cat = document.querySelector('.category.active > a > span.title');
            if (categoryElement_cat) {
                return categoryElement_cat.innerText;
            } else {
                return null;
            }
        }
    }
 
    // Setup MutationObserver
    function setupObserver() {
        const targetNode = document.querySelector('#stream');
        if (targetNode) {
            const observer = new MutationObserver(() => {
                const currentCategory = getCurrentCategory();
                if (currentCategory && selectedCategories.includes(currentCategory)) {
                    markDuplicatesAsRead();
                }
            });
            observer.observe(targetNode, { childList: true, subtree: true });
 
            // Initial run
            const currentCategory = getCurrentCategory();
            if (currentCategory && selectedCategories.includes(currentCategory)) {
                markDuplicatesAsRead();
            }
        } else {
            // Retry if #stream is not found
            setTimeout(setupObserver, 1000);
        }
    }
 
    // Start setupObserver when the script starts
    setupObserver();
})();