Adds vertical bars to the left of the comments, enabling you to easily collapse the parent comments. It also can leave only a specified number of comments expanded and auto-collapse the rest
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// ==UserScript==
// @name Collapse HackerNews Parent Comments
// @description Adds vertical bars to the left of the comments, enabling you to easily collapse the parent comments. It also can leave only a specified number of comments expanded and auto-collapse the rest
// @author BLBC (github.com/hjk789, greasyforks.org/users/679182-hjk789)
// @copyright 2020+, BLBC (github.com/hjk789, greasyforks.org/users/679182-hjk789)
// @version 1.0
// @homepage https://github.com/hjk789/Creations/tree/master/Userscripts/Collapse-HackerNews-Parent-Comments
// @license https://github.com/hjk789/Creations/tree/master/Userscripts/Collapse-HackerNews-Parent-Comments#license
// @grant none
// @include https://news.ycombinator.com/item*
// @namespace https://greasyforks.org/users/679182
// ==/UserScript==
//--------------- Settings -----------------
const collapse = true // Whether all comments, other than the number of comments below, should be collapsed.
// If set to false, all comments will be left expanded and the settings below have no effect.
const numberOfRoots = 3
const numberOfReplies = 2
const numberOfRepliesOfReplies = 1
//------------------------------------------
// HackerNews puts a 1x1 image before each comment and sets it's width according to each comment depth. Each level of depth adds
// 40px of width to this image, starting from 0 which are the root comments. The ones with a 14px width are flagged comments and
// the "More comments" link. And because HackerNews layout doesn't have any easier way of identifying the hierarchy of the
// comments (it's just a list of comments pushed to the right), that's the only way I've found to achieve this.
spacingImgs = document.querySelectorAll(".ind img[height='1']:not([width='14'])")
let root = 0
let i = 0
let commentHier = []
if (collapse) spacingImgs[0].parentElement.parentElement.querySelector(".togg").click()
collapseAll = setInterval(function() // An interval of 1ms is being used to prevent the page from freezing until it finishes. Also, it creates a cool effect when
{ // the comments are being collapsed. It does make it take a few more seconds to finish in comment-heavy posts (150+) though.
const level = spacingImgs[i].width / 40
let commentToggle = spacingImgs[i].parentElement.parentElement.querySelector(".togg")
if (collapse) commentToggle.click() // Collapse the first comment so it's expanded again below and you can read the first comment while the collapsing is under process
// Store the current hierarchy in an array
if (commentHier[level] == null)
commentHier.push(commentToggle)
else
commentHier[level] = commentToggle
const commentContainer = spacingImgs[i].parentElement.parentElement.parentElement.parentElement.parentElement
commentContainer.style = "border-top: 5px transparent solid" // To visually separate each vertical bar
spacingImgs[i].parentElement.style = "position: relative"
let divs = []
for (j = spacingImgs[i].width; j >= 0; j -= 40) // Start adding the vertical bar from the current depth and go backwards
{
// Create the vertical bar
const div = document.createElement("div");
div.commentHier = commentHier[j/40] // Store in an attribute of the element this comment's parent respective to the level of the vertical bar, for easy access
div.onclick = commentHier[j/40].onclick // When a vertical bar is clicked, collapse the respective parent comment
div.onmouseup = function(e)
{
if (e.target.commentHier.getBoundingClientRect().y < 0) // If the parent comment is off-screen above,
e.target.commentHier.scrollIntoView() // scroll to it
}
let style = "left: " + (-5 + j) + "px; width: 12px; background-color: lightgray; position: absolute; z-index: 99; "
// Make it so that the vertical bars are only separated when followed by comments of same level of depth
if (j == spacingImgs[i].width && spacingImgs[i-1] != null && spacingImgs[i].width <= spacingImgs[i-1].width)
style += "top: 5px; height: calc(100% + 8px); "
else
style += "top: 0px; height: calc(100% + 13px); "
div.style = style
divs.push(div)
}
for (j = divs.length - 1; j >= 0; j--)
spacingImgs[i].parentElement.appendChild(divs[j])
i++
if (i == spacingImgs.length) // When finished collapsing and adding the vertical bars to all comments, now it's time to expand only a few of the first comments
{
clearInterval(collapseAll)
if (collapse)
{
spacingImgs[0].parentElement.parentElement.querySelector(".togg").click() // Expand the first comment
root = 0
for (i=0; i < spacingImgs.length; i++)
{
commentToggle = spacingImgs[i].parentElement.parentElement.querySelector(".togg")
if (spacingImgs[i].width == 0) // If it's a root comment
{
root++
if (root == numberOfRoots + 1) break // If there's already <numberOfRoots> comments expanded, then stop expanding
commentToggle.click()
sub40 = 0
sub80 = 0
}
else if (spacingImgs[i].width == 40 && sub40 < numberOfReplies) // If it's a reply to the root comment, only expand up to <numberOfReplies>
{
commentToggle.click()
sub40++
sub80 = 0
}
else if (spacingImgs[i].width == 80 && sub80 < numberOfRepliesOfReplies) // If it's a reply to the reply, only expand up to <numberOfRepliesOfReplies>
{
commentToggle.click()
sub80++
}
}
}
}
}, 1)