index.js

// ==UserScript==
// @name         Refined GitHub Comments
// @license      MIT
// @homepageURL  https://github.com/bluwy/refined-github-comments
// @supportURL   https://github.com/bluwy/refined-github-comments
// @namespace    https://greasyfork.org/en/scripts/465056-refined-github-comments
// @version      0.2.6
// @description  Remove clutter in the comments view
// @author       Bjorn Lu
// @match        https://github.com/**
// @icon         https://www.google.com/s2/favicons?sz=64&domain=github.com
// @grant        none
// @inject-into  content
// ==/UserScript==

// #region User settings

// set to true to minimize all bot comments (has a "bot" tag next to its name)
const minimizeAllBotComments = false

// common bots that i already know what they do
const authorsToMinimize = [
  'changeset-bot',
  'codeflowapp',
  'netlify',
  'vercel',
  'pkg-pr-new',
  'codecov',
  'astrobot-houston',
  'codspeed-hq',
  'typescript-eslint',
  'nx-cloud',
  'flathubbot',
]

// common comments that don't really add value
const commentMatchToMinimize = [
  /^![a-z]/, // commands that start with !
  /^\/[a-z]/, // commands that start with /
  /^> root@0.0.0/, // astro preview release bot
  /^bot, build/,
]

// #endregion

// #region Run code

// Used by `minimizeDiscussionThread`
let expandedThread = false
const maxParentThreadHeight = 185

;(function () {
  'use strict'

  run()

  // listen to github page loaded event
  document.addEventListener('pjax:end', () => run())
  document.addEventListener('turbo:render', () => run())
})()

function run() {
  initAndObserveTimeline(() => {
    // Comments view
    const allTimelineItem = [
      ...document.querySelectorAll('.js-timeline-item'),
      ...document.querySelectorAll('.react-issue-comment'),
    ]
    const seenComments = []

    allTimelineItem.forEach((timelineItem) => {
      minimizeComment(timelineItem)
      minimizeBlockquote(timelineItem, seenComments)
    })
  })

  // Discussion threads view
  if (location.pathname.includes('/discussions/')) {
    minimizeDiscussionThread()
  }
}

// #endregion

// #region Features: minimize comment

// test urls:
// https://github.com/withastro/astro/pull/6845
/**
 * @param {HTMLElement} timelineItem
 */
function minimizeComment(timelineItem) {
  // things can happen twice in github for some reason
  if (timelineItem.querySelector('.refined-github-comments-toggle')) return

  const header = timelineItem.querySelector('.timeline-comment-header')
  if (!header) return

  const headerName = header.querySelector('a.author')
  if (!headerName) return

  const commentBody = timelineItem.querySelector('.comment-body')
  if (!commentBody) return

  const commentBodyText = commentBody.innerText.trim()

  // minimize the comment
  if (
    (minimizeAllBotComments && headerName.nextElementSibling?.textContent.includes('bot')) ||
    // check the author name directly
    authorsToMinimize.includes(headerName.innerText) ||
    // check via the href, which isn't needed actually but because Refined GitHub may change this to
    // a normal name, we need to fallback to checking via this as well
    authorsToMinimize.includes(headerName.getAttribute('href').slice(1)) ||
    commentMatchToMinimize.some((match) => match.test(commentBodyText))
  ) {
    const commentContent = timelineItem.querySelector('.edit-comment-hide')
    if (!commentContent) return
    const commentActions = timelineItem.querySelector('.timeline-comment-actions')
    if (!commentActions) return
    const headerH3 = header.querySelector('h3.text-normal')
    if (!headerH3) return
    const headerDiv = headerH3.querySelector('div')
    if (!headerDiv) return

    // hide comment
    header.style.borderBottom = 'none'
    commentContent.style.display = 'none'

    // add comment excerpt
    const excerpt = document.createElement('span')
    excerpt.setAttribute(
      'class',
      'text-fg-muted text-normal text-italic css-truncate css-truncate-overflow mr-2',
    )
    excerpt.innerHTML = commentBodyText.slice(0, 100)
    excerpt.style.opacity = '0.5'
    excerpt.style.flexGrow = '1'
    excerpt.style.width = '0'
    headerH3.classList.add('css-truncate', 'css-truncate-overflow')
    headerDiv.appendChild(excerpt)

    // add toggle button
    const toggleBtn = toggleComment((isShow) => {
      // headerH3 class needs to be toggled too so that the "edited dropdown" can be toggled
      if (isShow) {
        headerH3.classList.remove('css-truncate', 'css-truncate-overflow')
        header.style.borderBottom = ''
        commentContent.style.display = ''
        excerpt.style.display = 'none'
      } else {
        headerH3.classList.add('css-truncate', 'css-truncate-overflow')
        header.style.borderBottom = 'none'
        commentContent.style.display = 'none'
        excerpt.style.display = ''
      }
    })
    commentActions.prepend(toggleBtn)
  }
}

// #endregion

// #region Features: minimize blockquote

// test urls:
// https://github.com/bluwy/refined-github-comments/issues/1
// https://github.com/sveltejs/svelte/issues/2323
// https://github.com/pnpm/pnpm/issues/6463
/**
 * @param {HTMLElement} timelineItem
 * @param {{ text: string, id: string, author: string }[]} seenComments
 */
function minimizeBlockquote(timelineItem, seenComments) {
  const commentBody =
    timelineItem.querySelector('.comment-body') || timelineItem.querySelector('.markdown-body')
  if (!commentBody) return

  const commentId =
    timelineItem.querySelector('.timeline-comment-group')?.id ||
    timelineItem.querySelector('[data-testid="comment-header"]')?.id
  if (!commentId) return

  const commentAuthor =
    timelineItem.querySelector('.timeline-comment-header a.author')?.innerText ||
    timelineItem.querySelector('[data-testid="avatar-link"]')?.innerText
  if (!commentAuthor) return

  const commentText = commentBody.innerText.trim().replace(/\s+/g, ' ')

  // bail early in first comment and if comment is already checked before
  if (
    seenComments.length === 0 ||
    commentBody.querySelector('.refined-github-comments-reply-text')
  ) {
    seenComments.push({
      text: commentText,
      id: commentId,
      author: commentAuthor,
    })
    return
  }

  const blockquotes = [
    ...commentBody.querySelectorAll(':scope > blockquote'),
    ...commentBody.querySelectorAll(':scope > div > blockquote'),
  ]
  for (const blockquote of blockquotes) {
    const blockquoteText = blockquote.innerText.trim().replace(/\s+/g, ' ')

    const dupIndex = seenComments.findIndex((comment) => comment.text === blockquoteText)
    if (dupIndex >= 0) {
      const dup = seenComments[dupIndex]
      // if replying to the one above, always minimize it
      if (dupIndex === seenComments.length - 1) {
        // use span.js-clear so github would remove this summary when re-quoting this reply,
        // add nbsp so that the summary tag has some content, that the details would also
        // get copied when re-quoting too.
        const summary = `\
<span class="js-clear text-italic refined-github-comments-reply-text">
  Replying to <strong>@${dup.author}</strong> above
</span>&nbsp;`
        blockquote.innerHTML = `<details><summary>${summary}</summary>${blockquote.innerHTML}</details>`
      }
      // if replying to a long comment, or a comment with code, always minimize it
      else if (blockquoteText.length > 200 || blockquote.querySelector('pre')) {
        // use span.js-clear so github would remove this summary when re-quoting this reply,
        // add nbsp so that the summary tag has some content, that the details would also
        // get copied when re-quoting too.
        const summary = `\
<span class="js-clear text-italic refined-github-comments-reply-text">
  Replying to <strong>@${dup.author}</strong>'s <a href="#${dup.id}">comment</a>
</span>&nbsp;`
        blockquote.innerHTML = `<details><summary>${summary}</summary>${blockquote.innerHTML}</details>`
      }
      // otherwise, just add a hint so we don't have to navigate away a short sentence
      else {
        // use span.js-clear so github would remove this hint when re-quoting this reply
        const hint = `\
<span dir="auto" class="js-clear text-italic refined-github-comments-reply-text" style="display: block; margin-top: -0.5rem; opacity: 0.7; font-size: 90%;">
  — <strong>@${dup.author}</strong> said in <a href="#${dup.id}">comment</a>
</span>`
        blockquote.insertAdjacentHTML('beforeend', hint)
      }
      continue
    }

    const partialDupIndex = seenComments.findIndex((comment) =>
      comment.text.includes(blockquoteText),
    )
    if (partialDupIndex >= 0) {
      const dup = seenComments[partialDupIndex]
      // get first four words and last four words, craft a text fragment to highlight
      const splitted = blockquoteText.split(' ')
      const textFragment =
        splitted.length < 9
          ? `#:~:text=${encodeURIComponent(blockquoteText)}`
          : `#:~:text=${encodeURIComponent(splitted.slice(0, 4).join(' '))},${encodeURIComponent(
              splitted.slice(-4).join(' '),
            )}`

      // if replying to the one above, prepend hint
      if (partialDupIndex === seenComments.length - 1) {
        // use span.js-clear so github would remove this hint when re-quoting this reply
        const hint = `\
<span dir="auto" class="js-clear text-italic refined-github-comments-reply-text" style="display: block; margin-top: -0.5rem; opacity: 0.7; font-size: 90%;">
  — <strong>@${dup.author}</strong> <a href="${textFragment}">said</a> above
</span>`
        blockquote.insertAdjacentHTML('beforeend', hint)
      }
      // prepend generic hint
      else {
        // use span.js-clear so github would remove this hint when re-quoting this reply
        const hint = `\
<span dir="auto" class="js-clear text-italic refined-github-comments-reply-text" style="display: block; margin-top: -0.5rem; opacity: 0.7; font-size: 90%;">
  — <strong>@${dup.author}</strong> <a href="${textFragment}">said</a> in <a href="#${dup.id}">comment</a>
</span>`
        blockquote.insertAdjacentHTML('beforeend', hint)
      }
    }
  }

  seenComments.push({ text: commentText, id: commentId, author: commentAuthor })
}

// #endregion

// #region Features: minimize discussion threads

// test urls:
// https://github.com/vitejs/vite/discussions/18191
function minimizeDiscussionThread() {
  if (expandedThread) {
    _minimizeDiscussionThread()
    return
  }

  const discussionContainer = document.querySelector(
    '.discussion.js-discussion > .js-timeline-marker',
  )
  if (!discussionContainer) return

  const tripleDotMenuContainer = document.querySelector('.timeline-comment-actions')
  if (!tripleDotMenuContainer) return

  // Skip if already added
  if (document.getElementById('refined-github-comments-expand-btn') != null) return

  tripleDotMenuContainer.style.display = 'flex'
  tripleDotMenuContainer.style.alignItems = 'center'

  // Create a "Collapse threads" button to enable this feature
  const expandBtn = document.createElement('button')
  expandBtn.id = 'refined-github-comments-expand-btn'
  expandBtn.setAttribute('class', 'Button--iconOnly Button--invisible Button--medium Button mr-2')
  expandBtn.innerHTML = `\
<svg class="Button-visual octicon octicon-zap" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16">
  <path d="M9.504.43a1.516 1.516 0 0 1 2.437 1.713L10.415 5.5h2.123c1.57 0 2.346 1.909 1.22 3.004l-7.34 7.142a1.249 1.249 0 0 1-.871.354h-.302a1.25 1.25 0 0 1-1.157-1.723L5.633 10.5H3.462c-1.57 0-2.346-1.909-1.22-3.004L9.503.429Zm1.047 1.074L3.286 8.571A.25.25 0 0 0 3.462 9H6.75a.75.75 0 0 1 .694 1.034l-1.713 4.188 6.982-6.793A.25.25 0 0 0 12.538 7H9.25a.75.75 0 0 1-.683-1.06l2.008-4.418.003-.006a.036.036 0 0 0-.004-.009l-.006-.006-.008-.001c-.003 0-.006.002-.009.004Z"></path>
</svg>
`
  expandBtn.title = 'Collapse threads'
  expandBtn.addEventListener('click', () => {
    expandedThread = true
    _minimizeDiscussionThread()
    expandBtn.remove()
  })
  tripleDotMenuContainer.prepend(expandBtn)
}

function _minimizeDiscussionThread() {
  const timelineComments = document.querySelectorAll(
    '.timeline-comment.comment:not(.nested-discussion-timeline-comment)',
  )
  for (const timelineComment of timelineComments) {
    // Skip if already handled
    if (timelineComment.querySelector('.refined-github-comments-toggle')) continue

    const parentThreadContent = timelineComment.children[1]
    if (!parentThreadContent) continue

    // Find the "N replies" bottom text (a bit finicky but seems like the best selector)
    const bottomText = parentThreadContent.querySelector('span.color-fg-muted.no-wrap')
    const childrenThread = timelineComment.querySelector('[data-child-comments]')
    // Skip if 0 replies
    if (bottomText && childrenThread && /\d+/.exec(bottomText.textContent)?.[0] !== '0') {
      // Prepend a "expand thread" button
      // const expandBtn = document.createElement('button')
      // expandBtn.setAttribute('class', 'Button--secondary Button--small Button')
      // expandBtn.innerHTML = 'Expand thread'
      // expandBtn.addEventListener('click', () => {
      //   threadComment.style.display = ''
      //   bottomText.style.display = 'none'
      // })
      const toggleBtn = toggleComment((isShow) => {
        // Re-query as GitHub may update it when , e.g. showing more comments
        const childrenThreadAgain = timelineComment.querySelector('[data-child-comments]')
        if (childrenThreadAgain) {
          if (isShow) {
            childrenThreadAgain.style.display = ''
            bottomText.classList.add('color-fg-muted')
          } else {
            childrenThreadAgain.style.display = 'none'
            bottomText.classList.remove('color-fg-muted')
          }
        }
      })
      bottomText.parentElement.insertBefore(toggleBtn, bottomText)
      childrenThread.style.display = 'none'
      bottomText.classList.remove('color-fg-muted')
      // Lazy to make the bottom text a button, share the click event to the button for now
      // NOTE: This click happens to expand the comment too. I'm not sure how to prevent that.
      bottomText.addEventListener('click', () => {
        toggleBtn.click()
      })
    }

    const commentBody = parentThreadContent.querySelector('.comment-body')
    if (commentBody && commentBody.clientHeight > maxParentThreadHeight) {
      // Shrink the OP thread to max height
      const css = `max-height:${maxParentThreadHeight}px;mask-image:linear-gradient(180deg, #000 80%, transparent);-webkit-mask-image:linear-gradient(180deg, #000 80%, transparent);`
      commentBody.style.cssText += css
      // Add "view"
      const commentActions = timelineComment.querySelector('.timeline-comment-actions')
      const toggleCommentBodyBtn = toggleComment((isShow) => {
        if (isShow) {
          commentBody.style.maxHeight = ''
          commentBody.style.maskImage = ''
          commentBody.style.webkitMaskImage = ''
        } else {
          commentBody.style.cssText += css
        }
      })
      commentActions.style.display = 'flex'
      commentActions.style.alignItems = 'center'
      commentActions.prepend(toggleCommentBodyBtn)
      // Auto-expand on first click for nicer UX
      commentBody.addEventListener('click', () => {
        if (toggleCommentBodyBtn.dataset.show === 'false') {
          toggleCommentBodyBtn.click()
        }
      })
    }
  }
}

// #endregion

// #region Utilities

/**
 * Observe new comments
 * https://github.com/tjx666/user-scripts/blob/31584918a223d4f220a01b32dc52e972b0aeec5f/refined-gitHub-comments-tj.user.js#L163-L195
 * @param {Function} cb
 */
function initAndObserveTimeline(cb) {
  cb()

  const observer = new MutationObserver((mutations) => {
    const hasNewComments = mutations.some(
      (mutation) =>
        mutation.type === 'childList' &&
        Array.from(mutation.addedNodes).some(
          (node) =>
            node.nodeType === Node.ELEMENT_NODE &&
            (node.classList?.contains('react-issue-comment') ||
              node.querySelector?.('.react-issue-comment') ||
              node.classList?.contains('js-timeline-item') ||
              node.querySelector?.('.js-timeline-item')),
        ),
    )

    if (hasNewComments) {
      setTimeout(() => cb(), 500)
    }
  })

  observer.observe(document.body, { childList: true, subtree: true })
}

// create the toggle comment like github does when you hide a comment
function toggleComment(onClick) {
  const btn = document.createElement('button')
  // copied from github hidden comment style
  btn.innerHTML = `
<div class="color-fg-muted f6 no-wrap">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-unfold position-relative">
  <path d="m8.177.677 2.896 2.896a.25.25 0 0 1-.177.427H8.75v1.25a.75.75 0 0 1-1.5 0V4H5.104a.25.25 0 0 1-.177-.427L7.823.677a.25.25 0 0 1 .354 0ZM7.25 10.75a.75.75 0 0 1 1.5 0V12h2.146a.25.25 0 0 1 .177.427l-2.896 2.896a.25.25 0 0 1-.354 0l-2.896-2.896A.25.25 0 0 1 5.104 12H7.25v-1.25Zm-5-2a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5ZM6 8a.75.75 0 0 1-.75.75h-.5a.75.75 0 0 1 0-1.5h.5A.75.75 0 0 1 6 8Zm2.25.75a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5ZM12 8a.75.75 0 0 1-.75.75h-.5a.75.75 0 0 1 0-1.5h.5A.75.75 0 0 1 12 8Zm2.25.75a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5Z"></path>
  </svg>
</div>
<div class="color-fg-muted f6 no-wrap" style="display: none">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-fold position-relative">
    <path d="M10.896 2H8.75V.75a.75.75 0 0 0-1.5 0V2H5.104a.25.25 0 0 0-.177.427l2.896 2.896a.25.25 0 0 0 .354 0l2.896-2.896A.25.25 0 0 0 10.896 2ZM8.75 15.25a.75.75 0 0 1-1.5 0V14H5.104a.25.25 0 0 1-.177-.427l2.896-2.896a.25.25 0 0 1 .354 0l2.896 2.896a.25.25 0 0 1-.177.427H8.75v1.25Zm-6.5-6.5a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5ZM6 8a.75.75 0 0 1-.75.75h-.5a.75.75 0 0 1 0-1.5h.5A.75.75 0 0 1 6 8Zm2.25.75a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5ZM12 8a.75.75 0 0 1-.75.75h-.5a.75.75 0 0 1 0-1.5h.5A.75.75 0 0 1 12 8Zm2.25.75a.75.75 0 0 0 0-1.5h-.5a.75.75 0 0 0 0 1.5h.5Z"></path>
  </svg>
</div>
`
  const showNode = btn.querySelector('div:nth-child(1)')
  const hideNode = btn.querySelector('div:nth-child(2)')
  let isShow = false
  btn.setAttribute('type', 'button')
  btn.setAttribute('class', 'refined-github-comments-toggle timeline-comment-action btn-link')
  btn.dataset.show = isShow
  btn.addEventListener('click', () => {
    isShow = !isShow
    btn.dataset.show = isShow
    if (isShow) {
      showNode.style.display = 'none'
      hideNode.style.display = ''
    } else {
      showNode.style.display = ''
      hideNode.style.display = 'none'
    }
    onClick(isShow)
  })
  return btn
}

// #endregion