feat: repli des articles en mode lecture avec bouton Lire plus

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

static/read-more.js

@@ -0,0 +1,101 @@
+/* Read More — FreshRSS extension.
+ * Collapses long articles in reader view behind a "Read more" button.
+ * Collapsing uses max-height (never display:none) so FreshRSS's
+ * mark-as-read-on-scroll keeps measuring a non-zero article height. */
+(function (root) {
+	'use strict';
+
+	const THRESHOLD_RATIO = 1.5;
+	const STATE = { collapsed: 'collapsed', short: 'short', expanded: 'expanded' };
+	const defaultMeasure = (el) => el.scrollHeight;
+
+	function shouldCollapse(contentHeight, collapsedHeight) {
+		return contentHeight >= collapsedHeight * THRESHOLD_RATIO;
+	}
+
+	function expand(flux, text, button) {
+		text.classList.remove('read-more-collapsed');
+		text.style.removeProperty('--read-more-height');
+		button.remove();
+		flux.dataset.readMore = STATE.expanded;
+	}
+
+	function collapse(flux, text, opts) {
+		const doc = flux.ownerDocument;
+		text.classList.add('read-more-collapsed');
+		text.style.setProperty('--read-more-height', opts.collapsedHeight + 'px');
+		const button = doc.createElement('button');
+		button.type = 'button';
+		button.className = 'btn read-more-btn';
+		button.textContent = opts.label;
+		button.addEventListener('click', function (ev) {
+			ev.preventDefault();
+			ev.stopPropagation();
+			expand(flux, text, button);
+		});
+		text.after(button);
+		flux.dataset.readMore = STATE.collapsed;
+	}
+
+	function processEntry(flux, opts) {
+		const state = flux.dataset.readMore;
+		if (state !== undefined && state !== STATE.short) {
+			return;
+		}
+		const text = flux.querySelector('.text');
+		if (!text) {
+			return;
+		}
+		const measure = opts.measure || defaultMeasure;
+		if (shouldCollapse(measure(text), opts.collapsedHeight)) {
+			collapse(flux, text, opts);
+		} else {
+			flux.dataset.readMore = STATE.short;
+		}
+	}
+
+	function processEntries(rootNode, opts) {
+		rootNode.querySelectorAll('.flux').forEach((flux) => processEntry(flux, opts));
+	}
+
+	function init(win, measure) {
+		const context = win.context;
+		if (!context || context.current_view !== 'reader') {
+			return;
+		}
+		const conf = (context.extensions && context.extensions.read_more) || {};
+		const opts = {
+			collapsedHeight: Number(conf.collapsed_height) || 250,
+			label: conf.label || 'Read more',
+			measure: measure,
+		};
+		const doc = win.document;
+		processEntries(doc, opts);
+		doc.body.addEventListener('freshrss:load-more', () => processEntries(doc, opts));
+		// Late-loading images can make a "short" article long enough to collapse.
+		doc.addEventListener('load', function (ev) {
+			const target = ev.target;
+			if (!target || target.tagName !== 'IMG' || !target.closest) {
+				return;
+			}
+			const flux = target.closest('.flux[data-read-more="short"]');
+			if (flux) {
+				processEntry(flux, opts);
+			}
+		}, true);
+	}
+
+	const api = { THRESHOLD_RATIO, shouldCollapse, processEntries, init };
+	root.ReadMore = api;
+	if (typeof module !== 'undefined' && module.exports) {
+		module.exports = api;
+	}
+
+	if (root.document && root.document.addEventListener) {
+		if (typeof root.context !== 'undefined' && typeof root.context.extensions !== 'undefined') {
+			init(root);
+		} else {
+			root.document.addEventListener('freshrss:globalContextLoaded', () => init(root), false);
+		}
+	}
+}(typeof window !== 'undefined' ? window : globalThis));