MetaFilter: navigate through users' comments, and highlight comments by OP and yourself
Устаревшая версия за
// ==UserScript==
// @name MeFi Navigator Redux
// @namespace https://github.com/klipspringr/mefi-userscripts
// @version 2025-04-04
// @description MetaFilter: navigate through users' comments, and highlight comments by OP and yourself
// @author Klipspringer
// @supportURL https://github.com/klipspringr/mefi-userscripts
// @license MIT
// @match *://*.metafilter.com/*
// @grant none
// ==/UserScript==
const SVG_UP = `<svg xmlns="http://www.w3.org/2000/svg" hidden viewBox="0 0 100 100"><path id="mfnr-up" fill="currentColor" d="M 0 93.339 L 50 6.661 L 100 93.339 L 50 64.399 L 0 93.339 Z" /></svg>`;
const SVG_DOWN = `<svg xmlns="http://www.w3.org/2000/svg" hidden viewBox="0 0 100 100"><path id="mfnr-down" fill="currentColor" d="M 100 6.69 L 50 93.31 L 0 6.69 L 50 35.607 L 100 6.69 Z" /></svg>`;
const ATTR_BYLINE = "data-mfnr-byline";
const ATTR_NAVIGATOR = "data-mfnr-nav";
const getCookie = (key) => {
const s = RegExp(key + "=([^;]+)").exec(document.cookie);
if (!s || !s[1]) return null;
return decodeURIComponent(s[1]);
};
const markSelf = (targetNode) => {
const span = document.createElement("span");
span.style["margin-left"] = "4px";
span.style["padding"] = "0 4px";
span.style["border-radius"] = "2px";
span.style["background-color"] = "#C8E0A1";
span.style["color"] = "#000";
span.style["font-size"] = "0.8em";
span.textContent = "me";
targetNode.after(span);
};
const markOP = (targetNode) => {
const wrapper = targetNode.parentNode.parentNode;
wrapper.style["border-left"] = "5px solid #0004"; // 40% black
wrapper.style["padding-left"] = "10px";
};
const createLink = (
href,
svgHref,
width = "1em",
height = "0.8em",
viewBox = "0 0 100 80"
) => {
const a = document.createElement("a");
a.setAttribute("href", "#" + href);
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute("width", width);
svg.setAttribute("height", height);
svg.setAttribute("viewBox", viewBox);
const use = document.createElementNS("http://www.w3.org/2000/svg", "use");
use.setAttribute("href", "#" + svgHref);
svg.appendChild(use);
a.appendChild(svg);
return a;
};
const processByline = (
bylineNode,
user,
anchor,
anchors,
firstRun,
self = null,
op = null
) => {
// don't mark self or OP more than once
if (firstRun || !bylineNode.hasAttribute(ATTR_BYLINE)) {
if (self !== null && user === self) markSelf(bylineNode);
if (op !== null && user === op) markOP(bylineNode);
bylineNode.setAttribute(ATTR_BYLINE, "");
}
if (anchors.length <= 1) return;
const i = anchors.indexOf(anchor);
const previous = anchors[i - 1];
const next = anchors[i + 1];
const navigator = document.createElement("span");
navigator.setAttribute(ATTR_NAVIGATOR, "");
const nodes = ["["];
if (previous) nodes.push(createLink(previous, "mfnr-up"));
nodes.push(anchors.length);
if (next) nodes.push(createLink(next, "mfnr-down"));
nodes.push("]");
navigator.append(...nodes);
bylineNode.parentElement.appendChild(navigator);
};
const run = (firstRun = false) => {
const start = performance.now();
const subsite = window.location.hostname.split(".")[0];
const opHighlight = subsite !== "ask" && subsite !== "projects"; // don't highlight OP on subsites with this built in
const self = getCookie("USER_NAME");
// if not first run, remove any existing navigators (from both post and comments)
if (!firstRun) {
const existingNavigators = document.querySelectorAll(
`div#posts span.smallcopy > span[${ATTR_NAVIGATOR}]`
);
existingNavigators.forEach((n) => n.remove());
}
// post node (tested on all subsites, 2025-04-02)
const postNode = document.querySelector(
"div#posts div.copy > span.smallcopy > a:first-child"
);
const op = postNode.textContent;
// initialise with post
const bylines = [[op, "top"]];
const mapUsersAnchors = new Map([[op, ["top"]]]);
// comment nodes, excluding live preview (tested on all subsites, 2025-04-02)
const commentNodes = document.querySelectorAll(
"div#posts div.comments:not(#commentform *) > span.smallcopy > a:first-child"
);
for (const node of commentNodes) {
const user = node.textContent;
const anchorElement =
node.parentElement.parentElement.previousElementSibling;
const anchor = anchorElement.getAttribute("name");
bylines.push([user, anchor]);
const anchors = mapUsersAnchors.get(user) ?? [];
mapUsersAnchors.set(user, anchors.concat(anchor));
}
for (const [i, bylineNode] of [postNode, ...commentNodes].entries()) {
processByline(
bylineNode,
bylines[i][0],
bylines[i][1],
mapUsersAnchors.get(bylines[i][0]),
firstRun,
self,
opHighlight && i > 0 ? op : null
);
}
console.log(
"mefi-navigator-redux",
firstRun ? "first-run" : "new-comments",
1 + commentNodes.length,
Math.round(performance.now() - start) + "ms"
);
};
(() => {
if (
!/^\/(\d|comments\.mefi)/.test(window.location.pathname) ||
/rss$/.test(window.location.pathname)
)
return;
document.body.insertAdjacentHTML("beforeend", [SVG_UP, SVG_DOWN].join(""));
const newCommentsElement = document.getElementById("newcomments");
if (newCommentsElement) {
const observer = new MutationObserver(() => run(false));
observer.observe(newCommentsElement, { childList: true });
}
run(true);
})();