Fix for kbin code blocks federated from Lemmy. Strips out the weird <span> tags on each line.
// ==UserScript==
// @name Fix kbin Code Blocks
// @namespace pamasich-kbin
// @version 2.0.1
// @description Fix for kbin code blocks federated from Lemmy. Strips out the weird <span> tags on each line.
// @author Pamasich
// @match https://kbin.social/*
// @match https://kbin.earth/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=kbin.social
// @license MIT
// @grant none
// ==/UserScript==
/*
This script fixes code blocks on kbin that originate from Lemmy.
When federating code blocks, Lemmy includes additional <span> tags
which kbin currently does not expect, so it just renders them in plaintext.
The script removes those tags from code blocks.
*/
/** @type {String} */
const STYLEPATTERN = "((font-style:italic|font-weight:bold);)?color:#[0-9a-fA-F]{6};";
function setup () {
getCodeBlocks().forEach((code) => fix(code));
}
/**
* Repairs a given code block.
* @param {HTMLElement} original The code block that needs to be fixed
*/
function fix (original) {
if (!isErroneousCode(original)) return;
const fixed = document.createElement("code");
original.after(fixed);
const start = new RegExp(`^\\n?<span style="${STYLEPATTERN}">`);
const end = new RegExp(`\\n<\\/span>\\n?$`);
const combined = new RegExp(`<\\/span><span style="${STYLEPATTERN}">`, "g");
fixed.textContent = original.textContent
.replace(start, "")
.replaceAll(combined, "")
.replace(end, "");
original.style.display = "none";
}
/**
* Checks whether a given code block needs to be fixed.
* @param {HTMLElement} code
* @returns {Boolean}
*/
function isErroneousCode (code) {
const pattern = new RegExp(`^\\n?<span style="${STYLEPATTERN}">(.+\\n)+<\\/span>\\n?$`);
return pattern.test(code.textContent);
}
/**
* @returns {HTMLElement[]} A list of all the code blocks on the page
*/
function getCodeBlocks () {
return Array.from(document.querySelectorAll("pre code"));
}
setup();
const observer = new MutationObserver((mutations) => {
// the filter ensures the script only looks for new code blocks to fix if new comments were added or the user navigated to a different thread
const codeBlocks = mutations.flatMap((mutation) => Array.from(mutation.addedNodes))
.filter((node) => node.nodeName == "BLOCKQUOTE" || node.nodeName == "BODY")
.flatMap((node) => Array.from(node.querySelectorAll("pre code")));
// codeBlocks at this point might contain the same node twice, so the Set constructor is used to get unique nodes
new Set(codeBlocks).forEach(fix);
});
// observing the entire document because of turbo mode
observer.observe(document, { childList: true, subtree: true });