A userscript that adds a header that can toggle long code and quote blocks in comments
// ==UserScript==
// @name GitHub Collapse In Comment
// @version 1.0.23
// @description A userscript that adds a header that can toggle long code and quote blocks in comments
// @license MIT
// @author Rob Garrison
// @namespace https://github.com/Mottie
// @match https://github.com/*
// @match https://gist.github.com/*
// @run-at document-idle
// @grant GM_addStyle
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// @require https://greasyfork.org/scripts/28721-mutations/code/mutations.js?version=1108163
// @icon https://github.githubassets.com/pinned-octocat.svg
// @supportURL https://github.com/Mottie/GitHub-userscripts/issues
// ==/UserScript==
(() => {
"use strict";
/*
Idea from: https://github.com/dear-github/dear-github/issues/166 &
https://github.com/isaacs/github/issues/208
examples:
https://github.com/Mottie/tablesorter/issues/569
https://github.com/jquery/jquery/issues/3195
*/
// hide code/quotes longer than this number of lines
let minLines = GM_getValue("gcic-max-lines", 10),
startCollapsed = GM_getValue("gcic-start-collapsed", true);
// extract syntax type from class name
const regex = /highlight(?:-[^\s]+)+/;
// syntax highlight class name lookup table
const syntaxClass = {
basic: "HTML",
cs: "C#",
fsharp: "F#",
gfm: "Markdown",
jq: "JSONiq",
shell: "Bash (shell)",
tcl: "Glyph",
tex: "LaTex"
};
GM_addStyle(`
.gcic-block {
border:#eee 1px solid;
padding:2px 8px 2px 10px;
border-radius:5px 5px 0 0;
position:relative;
top:1px;
cursor:pointer;
font-weight:bold;
display:block;
}
.gcic-block + .highlight {
border-top:none;
}
.gcic-block + .email-signature-reply {
margin-top:0;
}
.gcic-block:after {
content:"\u25bc ";
float:right;
}
.gcic-block-closed {
border-radius:5px;
margin-bottom:10px;
}
.gcic-block-closed:after {
transform: rotate(90deg);
}
.gcic-block-closed + .highlight, .gcic-block-closed + .email-signature-reply,
.gcic-block-closed + pre {
display:none;
}
`);
function makeToggle(name, lines) {
/* full list of class names from (look at "tm_scope" value)
https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
here are some example syntax highlighted class names:
highlight-text-html-markdown-source-gfm-apib
highlight-text-html-basic
highlight-source-fortran-modern
highlight-text-tex
*/
let n = (name || "").match(regex);
if (n && n[0]) {
n = n[0].replace(
/(highlight[-\s]|(source-)|(text-)|(html-)|(markdown-)|(-modern))/g, ""
);
n = (syntaxClass[n] || n).toUpperCase().trim();
}
return `${n || "Block"} (${lines} lines)`;
}
function addToggles() {
// issue comments
if ($("#discussion_bucket")) {
let indx = 0;
const block = document.createElement("a"),
els = $$(".markdown-body pre, .email-signature-reply"),
len = els.length;
// "flash" = blue box styling
block.className = `gcic-block border flash${
startCollapsed ? " gcic-block-closed" : ""
}`;
block.href = "#";
// loop with delay to allow user interaction
const loop = () => {
let el, wrap, node, syntaxClass, numberOfLines,
// max number of DOM insertions per loop
max = 0;
while (max < 20 && indx < len) {
if (indx >= len) {
return;
}
el = els[indx];
if (el && !el.classList.contains("gcic-has-toggle")) {
numberOfLines = el.innerHTML.split("\n").length;
if (numberOfLines > minLines) {
syntaxClass = "";
wrap = closest(".highlight", el);
if (wrap && wrap.classList.contains("highlight")) {
syntaxClass = wrap.className;
} else {
// no syntax highlighter defined (not wrapped)
wrap = el;
}
node = block.cloneNode();
node.innerHTML = makeToggle(syntaxClass, numberOfLines);
wrap.parentNode.insertBefore(node, wrap);
el.classList.add("gcic-has-toggle");
if (startCollapsed) {
el.display = "none";
}
max++;
}
}
indx++;
}
if (indx < len) {
setTimeout(() => {
loop();
}, 200);
}
};
loop();
}
}
function addBindings() {
document.addEventListener("click", event => {
let els, indx, flag;
const el = event.target;
if (el && el.classList.contains("gcic-block")) {
event.preventDefault();
// shift + click = toggle all blocks in a single comment
// shift + ctrl + click = toggle all blocks on page
if (event.shiftKey) {
els = $$(
".gcic-block",
event.ctrlKey || event.metaKey ? "" : closest(".markdown-body", el)
);
indx = els.length;
flag = el.classList.contains("gcic-block-closed");
while (indx--) {
els[indx].classList.toggle("gcic-block-closed", !flag);
}
} else {
el.classList.toggle("gcic-block-closed");
}
removeSelection();
}
});
}
function update() {
let toggles = $$(".gcic-block"),
indx = toggles.length;
while (indx--) {
toggles[indx].parentNode.removeChild(toggles[indx]);
}
toggles = $$(".gcic-has-toggle");
indx = toggles.length;
while (indx--) {
toggles[indx].classList.remove("gcic-has-toggle");
}
addToggles();
}
function $(selector, el) {
return (el || document).querySelector(selector);
}
function $$(selector, el) {
return Array.from((el || document).querySelectorAll(selector));
}
function closest(selector, el) {
while (el && el.nodeType === 1) {
if (el.matches(selector)) {
return el;
}
el = el.parentNode;
}
return null;
}
function removeSelection() {
// remove text selection - https://stackoverflow.com/a/3171348/145346
const sel = window.getSelection ? window.getSelection() : document.selection;
if (sel) {
if (sel.removeAllRanges) {
sel.removeAllRanges();
} else if (sel.empty) {
sel.empty();
}
}
}
GM_registerMenuCommand("Set GitHub Collapse In Comment Max Lines", () => {
let val = prompt("Minimum number of lines before adding a toggle:",
minLines);
val = parseInt(val, 10);
if (val) {
minLines = val;
GM_setValue("gcic-max-lines", val);
update();
}
});
GM_registerMenuCommand("Set GitHub Collapse In Comment Initial State", () => {
let val = prompt(
"Start with blocks (c)ollapsed or (e)xpanded (first letter necessary):",
startCollapsed ? "collapsed" : "expanded"
);
if (val) {
val = /^c/.test(val || "");
startCollapsed = val;
GM_setValue("gcic-start-collapsed", val);
update();
}
});
document.addEventListener("ghmo:container", addToggles);
document.addEventListener("ghmo:preview", addToggles);
addBindings();
addToggles();
})();