Linux.do Comment Helper

Boost 列表折叠 + 回复字数提示
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// ==UserScript==
// @name         Linux.do Comment Helper
// @namespace    https://linux.do/
// @version      1.2
// @author       lying
// @description  Boost 列表折叠 + 回复字数提示
// @license      MIT
// @homepage     https://linux.do/
// @match        https://linux.do/*
// @grant        GM_addStyle
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @run-at       document-start
// ==/UserScript==

(function () {
  'use strict';

  const BOOST_LINE_HEIGHT = 38;
  const MODES = { firstLine: '显示第一行', hidden: '完全折叠' };

  let boostMode = GM_getValue('boostMode', 'firstLine');

  function registerMenuCommands() {
    Object.entries(MODES).forEach(([key, label]) => {
      const current = key === boostMode ? ' ✓' : '';
      GM_registerMenuCommand(`Boost: ${label}${current}`, () => {
        boostMode = key;
        GM_setValue('boostMode', key);
        applyBoostMode();
        location.reload();
      });
    });
  }

  function applyBoostMode() {
    document.documentElement.classList.toggle('boost-hidden', boostMode === 'hidden');
  }

  GM_addStyle(`
    .discourse-boosts__list {
      max-height: ${BOOST_LINE_HEIGHT}px;
      overflow: hidden;
    }
    .discourse-boosts__list.boost-no-collapse,
    .discourse-boosts__list.boost-expanded {
      max-height: none;
      overflow: visible;
    }
    html.boost-hidden .discourse-boosts__list {
      max-height: 0;
      overflow: hidden;
    }
    html.boost-hidden .discourse-boosts__list.boost-expanded {
      max-height: none;
      overflow: visible;
    }
    .boost-toggle-btn {
      background: none;
      border: none;
      cursor: pointer;
      font-size: 12px;
      color: var(--primary-medium, #888);
      padding: 4px 8px;
      border-radius: 4px;
      transition: color 0.2s, background-color 0.2s;
    }
    .boost-toggle-btn:hover {
      background-color: var(--primary-very-low, #f5f5f5);
      color: var(--primary, #333);
    }
    .char-counter {
      display: inline-flex;
      align-items: center;
      margin-inline-start: 12px;
      padding: 0.3em 0.6em;
      border-radius: 999px;
      border: 1px solid var(--primary-low, #e0e0e0);
      background: var(--secondary, #fff);
      color: var(--primary-medium, #888);
      font-size: 0.8rem;
      line-height: 1;
    }
  `);

  applyBoostMode();

  // ===== Boost 折叠 =====

  function ensureToggleButton(post) {
    const list = post.querySelector('.discourse-boosts__list');
    if (!list || list.classList.contains('boost-no-collapse')) return;

    const bubbleCount = list.querySelectorAll('.discourse-boosts__bubble').length;
    if (bubbleCount === 0) return;

    if (boostMode === 'firstLine' && list.scrollHeight <= BOOST_LINE_HEIGHT) {
      list.classList.add('boost-no-collapse');
      return;
    }

    const actions = post.querySelector('nav.post-controls .actions');
    if (!actions || actions.querySelector('.boost-toggle-btn')) return;

    const expanded = list.classList.contains('boost-expanded');
    const btn = document.createElement('button');
    btn.className = 'boost-toggle-btn';
    btn.textContent = expanded ? '▼ Boost' : `▶ Boost (${bubbleCount})`;

    btn.addEventListener('click', () => {
      const isExpanded = list.classList.toggle('boost-expanded');
      btn.textContent = isExpanded ? '▼ Boost' : `▶ Boost (${bubbleCount})`;
    });

    actions.insertBefore(btn, actions.firstChild);
  }

  function scanBoosts() {
    const posts = document.querySelectorAll('.topic-post:has(.discourse-boosts__list)');
    posts.forEach(ensureToggleButton);
  }

  // ===== 字数提示 =====

  function syncCharCounter() {
    const host = document.querySelector('#reply-control.open .save-or-cancel');
    if (!host) {
      document.querySelector('.char-counter')?.remove();
      return;
    }

    let counter = host.querySelector('.char-counter');
    if (!counter) {
      counter = document.createElement('span');
      counter.className = 'char-counter';
      host.appendChild(counter);
    }

    const textarea = document.querySelector('#reply-control textarea.d-editor-input');
    const text = (textarea?.value ?? '').replace(/\u200B/g, '');
    const count = Array.from(text.trim()).length;
    counter.textContent = `${count} 字`;
  }

  // ===== 调度 =====

  let boostRafId = null;
  let counterRafId = null;

  function scheduleBoostScan() {
    if (boostRafId) return;
    boostRafId = requestAnimationFrame(() => {
      boostRafId = null;
      scanBoosts();
    });
  }

  function scheduleCounterSync() {
    if (counterRafId) return;
    counterRafId = requestAnimationFrame(() => {
      counterRafId = null;
      syncCharCounter();
    });
  }

  function init() {
    registerMenuCommands();
    scheduleBoostScan();
    scheduleCounterSync();

    document.addEventListener('input', (e) => {
      if (e.target.matches?.('#reply-control textarea.d-editor-input')) {
        scheduleCounterSync();
      }
    }, true);

    const observer = new MutationObserver(scheduleBoostScan);
    const root = document.querySelector('.post-stream')
      || document.getElementById('main-outlet')
      || document.body;
    observer.observe(root, { childList: true, subtree: true });

    const rc = document.getElementById('reply-control');
    if (rc) {
      new MutationObserver(scheduleCounterSync)
        .observe(rc, { attributes: true, attributeFilter: ['class'] });
    }
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();