kepr.js

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1// Kepr's browser islands (§18). Every page is complete without this file; it only adds the2// ticker's pace, the drifting timeline, copy buttons, the inline panels, history's scrolling,3// line-range highlighting, the Atlas panel, picker, filter and file viewer, the signed-in4// editor, and the profile's glow.56// Kepr 2's save kinds (canvas.js), first match wins: each dot's colour and strength.7const KINDS = [8	[/\b(release|version|bump|tag)\b/i, "accent", 1],9	[/\b(fix|bug|patch|issue|crash|error|regress|revert)\b/i, "accent-dim", 0.8],10	[/\b(add|new|implement|feat|introduce|wire|support)\b/i, "accent", 1],11	[12		/\b(refactor|restructure|reorganize|extract|move|rename|split|cleanup|clean up)\b/i,13		"text",14		0.85,15	],16	[/\b(perf|optim|speed|fast|slow|cache|memory|alloc)\b/i, "accent", 0.9],17	[/\b(test|spec|coverage|assert)\b/i, "text-secondary", 0.74],18	[/\b(doc|readme|comment|example|guide)\b/i, "text-secondary", 0.7],19	[/\b(polish|style|format|lint|whitespace|typo|wording|copy)\b/i, "text-secondary", 0.66],20	[/\b(chore|deps|update|upgrade|build|ci|config)\b/i, "text-secondary", 0.62],21];22// Kepr 2's timeline (canvas.js keprThread): the saves on a strip that drifts slowly and loops.23// Hovering pauses it and shows the save, dragging scrubs, a click opens the save. Under reduced24// motion it moves only when dragged.25function timeline() {26	const svg = document.querySelector("svg.timeline");27	if (!svg) return;28	const css = getComputedStyle(document.documentElement);29	const saves = [...svg.querySelectorAll(".dot")]30		.map((dot) => {31			const [id, message, meta] = (dot.querySelector("title")?.textContent ?? "").split("\n");32			const [, color, alpha] = KINDS.find(([kind]) => kind.test(message)) ?? [33				null,34				"text-secondary",35				0.8,36			];37			const fill = css.getPropertyValue(`--${color}`).trim();38			return { href: dot.getAttribute("href"), id, message, meta, fill, alpha, t: +dot.dataset.t };39		})40		.sort((a, b) => a.t - b.t);41	if (saves.length === 0) return;42	const canvas = document.createElement("canvas");43	canvas.className = "timeline-canvas";44	canvas.setAttribute("role", "img");45	canvas.setAttribute("aria-label", svg.getAttribute("aria-label"));46	svg.replaceWith(canvas);47	const ctx = canvas.getContext("2d");48	const tip = document.createElement("div");49	tip.className = "timeline-tip";50	tip.hidden = true;51	document.body.append(tip);52	const reduce = matchMedia("(prefers-reduced-motion: reduce)");53	let [width, height, strip, radius, offset] = [0, 0, 0, 0, 0];54	// Laid out by time, a repo's bursts sat between long empty stretches the drift crawled55	// through. Each dot instead sits after the one before by the gap between them, on a log scale56	// and capped, so a busy day stays tight and a quiet month reads as a pause, not a wait.57	const spacing = (seconds) => radius + 8 + Math.min(96, 12 * Math.log2(1 + seconds / 3600));58	const resize = () => {59		width = canvas.parentElement.getBoundingClientRect().width;60		// Kepr 2's band was tall to hold two lanes; with one line, only room for the dots and label.61		height = 64;62		canvas.width = Math.round(width * devicePixelRatio);63		canvas.height = Math.round(height * devicePixelRatio);64		canvas.style.width = `${width}px`;65		canvas.style.height = `${height}px`;66		ctx.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0);67		radius = 5;68		let x = 0;69		saves.forEach((save, i) => {70			if (i > 0) x += spacing(save.t - saves[i - 1].t);71			save.x = x;72		});73		// The seam is one more capped pause, or the rest of the view when the saves are few.74		strip = Math.max(x + spacing(Number.POSITIVE_INFINITY), width);75		offset = x - width * 0.82;76	};77	// Every visible copy of each x on the looping strip.78	const onScreen = (x, margin) => {79		const shift = ((offset % strip) + strip) % strip;80		const copies = [];81		for (let sx = x - shift - strip; sx < width + margin; sx += strip) {82			if (sx > -margin) copies.push(sx);83		}84		return copies;85	};86	const hit = (event) => {87		const box = canvas.getBoundingClientRect();88		const [mx, my] = [event.clientX - box.left, event.clientY - box.top];89		if (Math.abs(my - height / 2) > radius + 7) return null;90		return (91			saves.find((save) => onScreen(save.x, 0).some((x) => Math.abs(mx - x) < radius + 7)) ?? null92		);93	};94	let [hovered, drag, dragFrom, downX, lastX, velocity, resumeAt, lastFrame] = [95		null,96		null,97		0,98		0,99		0,100		0,101		0,102		0,103	];104	const hover = (save, event) => {105		if (save !== hovered) {106			hovered = save;107			tip.hidden = save === null;108			if (save)109				tip.replaceChildren(110					line("tip-id", save.id),111					line("tip-msg", save.message),112					line("tip-meta", save.meta),113				);114		}115		if (save) {116			const left = event.clientX + 14;117			tip.style.left = `${left + 340 > innerWidth ? Math.max(8, event.clientX - 354) : left}px`;118			tip.style.top = `${event.clientY - 10}px`;119		}120		canvas.style.cursor = save ? "pointer" : drag === null ? "grab" : "grabbing";121	};122	const draw = (time) => {123		const dt = lastFrame ? Math.min((time - lastFrame) / 1000, 0.1) : 0;124		lastFrame = time;125		if (drag === null && hovered === null) {126			if (Math.abs(velocity) > 0.5) {127				offset -= velocity;128				velocity *= 0.92;129			} else if (!reduce.matches && time >= resumeAt) offset += 20 * dt;130		}131		const y = height / 2;132		ctx.clearRect(0, 0, width, height);133		ctx.lineWidth = 1;134		ctx.globalAlpha = 0.7;135		ctx.strokeStyle = css.getPropertyValue("--text-muted");136		ctx.setLineDash([4, 4]);137		ctx.beginPath();138		ctx.moveTo(0, y);139		ctx.lineTo(width, y);140		ctx.stroke();141		ctx.setLineDash([]);142		ctx.font = '10px "Martian Mono", monospace';143		ctx.textAlign = "center";144		for (const save of saves) {145			for (const x of onScreen(save.x, 10)) {146				ctx.globalAlpha = hovered === null ? save.alpha : hovered === save ? 1 : save.alpha * 0.6;147				ctx.fillStyle = save.fill;148				ctx.beginPath();149				ctx.arc(x, y, radius, 0, Math.PI * 2);150				ctx.fill();151				if (hovered === save) {152					ctx.fillStyle = css.getPropertyValue("--accent");153					ctx.fillText(save.id.slice(0, 6), x, y - radius - 6);154				}155			}156		}157		ctx.globalAlpha = 1;158		requestAnimationFrame(draw);159	};160	canvas.addEventListener("pointerdown", (event) => {161		[drag, dragFrom, downX, lastX, velocity] = [162			event.clientX,163			offset,164			event.clientX,165			event.clientX,166			0,167		];168		canvas.setPointerCapture(event.pointerId);169	});170	canvas.addEventListener("pointermove", (event) => {171		if (drag !== null) {172			offset = dragFrom - (event.clientX - drag);173			velocity = velocity * 0.6 + (event.clientX - lastX) * 0.4;174			lastX = event.clientX;175		}176		if (event.pointerType === "mouse") hover(hit(event), event);177	});178	const release = () => {179		drag = null;180		resumeAt = performance.now() + 900;181	};182	canvas.addEventListener("pointerup", (event) => {183		release();184		const save = Math.abs(event.clientX - downX) > 4 ? null : hit(event);185		if (save) location.href = save.href;186	});187	canvas.addEventListener("pointercancel", release);188	canvas.addEventListener("pointerleave", (event) => {189		if (drag === null) hover(null, event);190	});191	addEventListener("resize", resize);192	resize();193	requestAnimationFrame(draw);194}195196function line(className, text) {197	const div = document.createElement("div");198	div.className = className;199	div.textContent = text ?? "";200	return div;201}202203function copyButtons(root) {204	for (const button of root.querySelectorAll("button[data-copy]")) {205		const label = button.textContent;206		button.hidden = false;207		button.addEventListener("click", async () => {208			await navigator.clipboard.writeText(button.dataset.copy);209			button.textContent = "copied";210			button.classList.add("copied");211			setTimeout(() => {212				button.textContent = label;213				button.classList.remove("copied");214			}, 1400);215		});216	}217}218219// A Kepr page's <main>, its links made absolute so they point where they did on their own page220// (after any redirect). An error page's <main> comes back too, so a refused form shows why; null if221// nothing came back, and the caller then goes to the page itself.222async function fetchMain(url, init) {223	try {224		const response = await fetch(url, init);225		const page = new DOMParser().parseFromString(await response.text(), "text/html");226		const main = page.querySelector("main");227		for (const link of main?.querySelectorAll("a[href]:not([href^='#'])") ?? []) {228			link.href = new URL(link.getAttribute("href"), response.url || url).href;229		}230		return main;231	} catch {232		return null;233	}234}235236// A click the browser should handle itself: a new tab or window, or a download.237function modified(event) {238	return event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey || event.altKey;239}240241// §21.9's panels open inline under the tabs, as Kepr 2's did: the panel page without its heading.242// The panel's own pages (an issue, the report form) and its forms stay inside it; a link elsewhere,243// or to a file (a download), navigates. The open tab takes the panel back to its first page, and244// closes it from there.245function panels() {246	const host = document.querySelector(".repo-panel");247	if (!host) return;248	let open = null;249	let shown = "";250	const load = async (url, init) => {251		shown = url;252		const main = await fetchMain(url, init);253		if (shown !== url) return;254		if (!main) {255			location.href = url;256			return;257		}258		main.querySelector(".breadcrumb")?.remove();259		main.querySelector(".file-page-title")?.remove();260		host.replaceChildren(...main.childNodes);261		copyButtons(host);262		host.hidden = false;263	};264	const inside = (url) => {265		const base = new URL(open.href).pathname;266		const { pathname } = new URL(url);267		return (pathname === base || pathname.startsWith(`${base}/`)) && !/\.[^/]*$/.test(pathname);268	};269	for (const tab of document.querySelectorAll(".repo-tab[data-panel]")) {270		tab.addEventListener("click", (event) => {271			if (modified(event)) return;272			event.preventDefault();273			if (open === tab && shown !== tab.href) {274				load(tab.href);275				return;276			}277			open?.classList.remove("active");278			if (open === tab) {279				open = null;280				shown = "";281				host.hidden = true;282				return;283			}284			open = tab;285			tab.classList.add("active");286			load(tab.href);287		});288	}289	host.addEventListener("click", (event) => {290		const link = event.target.closest("a[href]");291		if (!link || !open || modified(event) || link.hasAttribute("download")) return;292		if (!inside(link.href)) return;293		event.preventDefault();294		load(link.href);295	});296	host.addEventListener("submit", (event) => {297		const form = event.target;298		if (!open || !inside(form.action)) return;299		event.preventDefault();300		const method = form.method.toUpperCase();301		const data = new FormData(form);302		if (method === "GET") load(`${form.action}?${new URLSearchParams(data)}`);303		else load(form.action, { method, body: data });304	});305}306307// History and the Atlas's save picker hold one page of saves; scrolling to the end of either308// brings in the next page's rows. The pager is for pages without JavaScript.309function saveLists() {310	for (const list of document.querySelectorAll(".save-list")) {311		const observer = new IntersectionObserver(312			async ([entry]) => {313				const older = list.querySelector(".pager-older");314				if (!entry?.isIntersecting || !older) return;315				observer.disconnect();316				const main = await fetchMain(older.href);317				const next = main?.querySelector(`.save-list[data-list="${list.dataset.list}"]`);318				if (!next) return;319				next.querySelector(".pager a:not(.pager-older)")?.remove();320				list.querySelector(".pager").replaceWith(...next.childNodes);321				watch();322			},323			{ root: list },324		);325		const watch = () => {326			const older = list.querySelector(".pager-older");327			if (older) observer.observe(older);328		};329		watch();330	}331}332333// `#L42` works through CSS :target alone; a range `#L42-L50` needs marking line by line.334function lineRanges() {335	const code = document.querySelector(".code");336	if (!code) return;337	let anchor = null;338	const mark = () => {339		for (const marked of code.querySelectorAll(".line.hl")) marked.classList.remove("hl");340		const match = /^#L(\d+)(?:-L(\d+))?$/.exec(location.hash);341		if (!match) return;342		const from = Number(match[1]);343		const to = Number(match[2] ?? match[1]);344		anchor = from;345		for (let n = Math.min(from, to); n <= Math.max(from, to); n++) {346			document.getElementById(`L${n}`)?.classList.add("hl");347		}348		document.getElementById(`L${Math.min(from, to)}`)?.scrollIntoView({ block: "center" });349	};350	code.addEventListener("click", (event) => {351		const link = event.target.closest(".ln");352		if (!link || !event.shiftKey || anchor === null) return;353		event.preventDefault();354		const n = Number(link.textContent);355		history.replaceState(null, "", `#L${Math.min(anchor, n)}-L${Math.max(anchor, n)}`);356		mark();357	});358	window.addEventListener("hashchange", mark);359	mark();360}361362// The Atlas (§21.5): each row's detail panel waits in the <template> after it; the filter narrows363// by filename; which folders are open is remembered per repo in this browser.364function atlas() {365	const root = document.querySelector(".atlas");366	const filter = document.querySelector(".atlas-filter");367	if (!root || !filter) return;368	const panel = root.querySelector(".atlas-panel");369	const folders = [...root.querySelectorAll(".atlas-folder")];370	const files = [...root.querySelectorAll(".atlas-file")];371	// Its height is the closed tree's, fixed before any folder opens; opening one scrolls within.372	root.style.height = `${root.offsetHeight}px`;373	root.style.overflowY = "hidden";374	const key = `kepr:atlas:${root.dataset.repo}`;375	const opened = new Set(remembered(key));376	// `?open=<folder>` from a file page's breadcrumb unfolds that folder, without remembering it.377	const unfold = new URLSearchParams(location.search).get("open");378	const onPath = (path) => unfold !== null && `${unfold}/`.startsWith(`${path}/`);379	for (const folder of folders) {380		folder.open = opened.has(folder.dataset.path) || onPath(folder.dataset.path);381		folder.addEventListener("toggle", () => {382			if (filter.value.trim()) return;383			if (folder.open) opened.add(folder.dataset.path);384			else opened.delete(folder.dataset.path);385			remember(key, [...opened]);386		});387	}388	let selected = null;389	const show = (row) => {390		selected?.classList.remove("selected");391		selected = row;392		row.classList.add("selected");393		panel.replaceChildren(row.nextElementSibling.content.cloneNode(true));394	};395	for (const row of root.querySelectorAll(".atlas-row")) {396		row.addEventListener("pointerenter", (event) => {397			if (event.pointerType === "mouse") show(row);398		});399		row.addEventListener("focus", () => show(row));400	}401	// A map link in a panel jumps to its row, opening the folders above it.402	const jump = (path) => {403		const row = path.endsWith("/")404			? folders.find((folder) => `${folder.dataset.path}/` === path)?.firstElementChild405			: files.find((file) => file.dataset.path === path);406		if (!row) return false;407		for (const folder of folders) folder.open ||= path.startsWith(`${folder.dataset.path}/`);408		show(row);409		row.scrollIntoView({ block: "nearest" });410		return true;411	};412	panel.addEventListener("click", (event) => {413		const link = event.target.closest("a.atlas-jump");414		if (link && !modified(event) && jump(link.dataset.path)) event.preventDefault();415	});416	const viewer = fileViewer(root, jump);417	for (const file of files) {418		file.addEventListener("click", (event) => {419			if (modified(event)) return;420			event.preventDefault();421			viewer(file);422		});423	}424	const target = folders.find((folder) => folder.dataset.path === unfold)?.firstElementChild;425	if (target) {426		show(target);427		target.scrollIntoView({ block: "center" });428	}429	filter.addEventListener("input", () => {430		const query = filter.value.trim().toLowerCase();431		for (const file of files) file.hidden = query !== "" && !file.dataset.name.includes(query);432		for (const folder of folders) {433			folder.hidden = query !== "" && !folder.querySelector(".atlas-file:not([hidden])");434			folder.open = query !== "" || opened.has(folder.dataset.path);435		}436	});437	// One button opens every folder, or, when they all are, closes them all.438	const fold = document.querySelector(".atlas-fold-btn");439	const label = () => {440		fold.textContent = folders.every((folder) => folder.open) ? "collapse all" : "expand all";441	};442	fold.addEventListener("click", () => {443		const open = !folders.every((folder) => folder.open);444		for (const folder of folders) folder.open = open;445		label();446	});447	for (const folder of folders) folder.addEventListener("toggle", label);448	label();449	fold.hidden = folders.length === 0;450	// The filter waits behind a search button, and folds back into it when left empty.451	const search = document.querySelector(".atlas-search-btn");452	search.addEventListener("click", () => {453		search.hidden = true;454		filter.hidden = false;455		filter.focus();456	});457	filter.addEventListener("blur", () => {458		if (filter.value.trim() !== "") return;459		filter.hidden = true;460		search.hidden = false;461	});462	search.hidden = false;463	panel.hidden = false;464}465466// Kepr 2's Atlas picker: saves filtered as you type; a click outside or Escape closes it.467function atlasPicker() {468	const picker = document.querySelector(".atlas-picker");469	if (!picker) return;470	const filter = picker.querySelector(".atlas-picker-filter");471	const rows = [...picker.querySelectorAll(".atlas-picker-row")];472	filter.addEventListener("input", () => {473		const query = filter.value.trim().toLowerCase();474		for (const row of rows) row.hidden = query !== "" && !row.dataset.q.includes(query);475	});476	picker.addEventListener("toggle", () => {477		if (picker.open) filter.focus();478	});479	document.addEventListener("click", (event) => {480		if (!picker.contains(event.target)) picker.open = false;481	});482	picker.addEventListener("keydown", (event) => {483		if (event.key === "Escape") picker.open = false;484	});485	filter.hidden = false;486}487488// Files open in a viewer over the page, as in Kepr 2's Atlas: the file page's content with the489// row's detail panel beside it, and controls for text size, wrapping, raw, download and the490// neighbouring files. Escape closes it; the arrow keys step through the files.491function fileViewer(root, jump) {492	let [row, size, wrap] = [null, 12, false];493	const overlay = element("div", "fv-overlay");494	overlay.tabIndex = -1;495	overlay.setAttribute("role", "dialog");496	overlay.setAttribute("aria-modal", "true");497	const close = () => {498		overlay.remove();499		row?.focus();500		row = null;501	};502	const step = (by) => {503		const rows = [...root.querySelectorAll(".atlas-file")].filter((file) => !file.hidden);504		const next = rows[rows.indexOf(row) + by];505		if (next) open(next);506	};507	const restyle = () => {508		overlay.style.setProperty("--fv-size", `${size}px`);509		overlay.classList.toggle("fv-wrap", wrap);510	};511	const open = async (file, url = file.href) => {512		row = file;513		const rows = [...root.querySelectorAll(".atlas-file")].filter((each) => !each.hidden);514		const index = rows.indexOf(file);515		const detail = file.nextElementSibling.content.cloneNode(true);516		const name = detail.querySelector(".atlas-info-name").textContent;517		const path = detail.querySelector(".atlas-info-path").textContent;518		const raw = new URL(file.href);519		raw.pathname = raw.pathname.replace(/^(\/[^/]+)\/files\//, "$1/raw/");520		const button = (text, action, className = "fv-ctrl-btn") => {521			const b = element("button", className, text);522			b.type = "button";523			b.addEventListener("click", action);524			return b;525		};526		const link = (text, download) => {527			const a = element("a", "fv-ctrl-btn", text);528			a.href = raw.href;529			if (download) a.download = name;530			return a;531		};532		const source = element("div", "fv-source", "loading…");533		const panel = element("aside", "fv-detail");534		panel.append(detail);535		const header = element("div", "fv-header");536		const title = element("div", "fv-title");537		title.append(element("span", "fv-name", name), element("span", "fv-path mono", path));538		const controls = element("div", "fv-controls mono");539		controls.append(540			button("A−", () => {541				size = Math.max(9, size - 1);542				restyle();543			}),544			button("A+", () => {545				size = Math.min(20, size + 1);546				restyle();547			}),548			button("⇌ wrap", (event) => {549				wrap = !wrap;550				event.currentTarget.classList.toggle("active", wrap);551				restyle();552			}),553			link("raw", false),554			link("download", true),555		);556		controls.children[2].classList.toggle("active", wrap);557		const nav = element("div", "fv-nav mono");558		const back = button("←", () => step(-1), "fv-ctrl-btn");559		const forward = button("→", () => step(1), "fv-ctrl-btn");560		back.disabled = index <= 0;561		forward.disabled = index >= rows.length - 1;562		nav.append(back, element("span", "fv-pos", `${index + 1}/${rows.length}`), forward);563		header.append(button("×", close, "fv-close"), title, controls, nav);564		const body = element("div", "fv-body");565		body.append(source, panel);566		overlay.replaceChildren(header, body);567		restyle();568		if (!overlay.isConnected) document.body.append(overlay);569		overlay.focus();570		const main = await fetchMain(url);571		if (row !== file) return;572		if (!main) {573			location.href = url;574			return;575		}576		for (const heading of main.querySelectorAll(".breadcrumb, .file-page-title")) heading.remove();577		main.querySelector(".file-meta:not(:last-child)")?.remove();578		source.replaceChildren(...main.childNodes);579	};580	overlay.addEventListener("keydown", (event) => {581		if (event.key === "Escape") close();582		else if (event.key === "ArrowLeft" || event.key === "ArrowRight") {583			event.preventDefault();584			step(event.key === "ArrowLeft" ? -1 : 1);585		}586	});587	// A map link beside the code opens that file here; a folder closes the viewer on its row.588	overlay.addEventListener("click", (event) => {589		const link = event.target.closest(".fv-detail a.atlas-jump");590		if (!link || modified(event)) return;591		const path = link.dataset.path;592		const file = [...root.querySelectorAll(".atlas-file")].find((f) => f.dataset.path === path);593		event.preventDefault();594		if (file) open(file);595		else {596			close();597			jump(path);598		}599	});600	// The Markdown view's rendered/source toggle points at the file page: switch in place.601	overlay.addEventListener("click", (event) => {602		const link = event.target.closest(".fv-source a[href]");603		if (!link || !row || modified(event)) return;604		if (new URL(link.href).pathname !== new URL(row.href).pathname) return;605		event.preventDefault();606		open(row, link.href);607	});608	return open;609}610611async function navbarLogin() {612	const link = document.querySelector('.nav-links a[href^="/sign-in"]');613	if (!link || !/(^|;\s*)kepr_editor=1(?:;|$)/.test(document.cookie)) return;614	try {615		const response = await fetch("/admin", { cache: "no-store" });616		if (!response.ok) return;617		const doc = new DOMParser().parseFromString(await response.text(), "text/html");618		const token = doc.querySelector('form[action="/admin/sign-out"] input[name="form"]');619		if (!token) return;620		const form = element("form", "nav-logout");621		form.method = "post";622		form.action = "/admin/sign-out";623		const button = element("button", "", "log out");624		button.type = "submit";625		form.append(token, button);626		link.replaceWith(form);627	} catch (error) {628		console.error("Could not check navbar sign-in state", error);629	}630}631632function element(tag, className, text) {633	const node = document.createElement(tag);634	node.className = className;635	if (text !== undefined) node.textContent = text;636	return node;637}638639// Signed in, a repo page's description and details are edited in place: Markdown with a toolbar640// and a preview as the page will show it, pictures and videos picked, dropped or pasted in, and641// the one under the caret sized and placed from a row of controls. The page's HTML is the same642// for everyone; only this cookie, which says nothing but "signed in here", brings the controls.643async function repoEditor() {644	const head = document.querySelector(".repo-head");645	if (!head || !/(^|;\s*)kepr_editor=1/.test(document.cookie)) return;646	const base = `/admin/repos/${location.pathname.split("/")[1]}`;647	const response = await fetch(`${base}/text`).catch(() => null);648	if (!response?.ok) return;649	const texts = await response.json();650	const details = document.querySelector(".repo-details");651	const places = [652		["description", head.querySelector(".repo-desc"), head.querySelector(".repo-desc")],653		["details", details, details.querySelector(".repo-details-body")],654	];655	for (const [field, section, body] of places) {656		section.hidden = false;657		const button = element("button", "edit-btn mono", "edit");658		button.type = "button";659		(section.querySelector(".repo-details-head") ?? section).append(button);660		button.addEventListener("click", (event) => {661			event.preventDefault();662			if (!body.querySelector(".editor")) editText(base, texts.form, field, body, texts[field]);663		});664	}665}666667const MEDIA_MARKDOWN = /!\[([^\]]*)\]\(([^)\s]+)(?:\s+"([^"]*)")?\)/g;668const MEDIA_TYPES = "image/png,image/jpeg,image/gif,image/webp,video/mp4,video/webm";669670function editText(base, form, field, body, text) {671	const kept = [...body.childNodes];672	const input = element("textarea", "editor-input mono");673	input.value = text;674	input.rows = field === "details" ? 16 : 3;675	const preview = element("div", `editor-preview${field === "details" ? " markdown" : ""}`);676	const media = element("div", "editor-media mono");677	const status = element("span", "editor-status");678	const post = (path, fields) => {679		const data = new FormData();680		data.append("form", form);681		for (const [name, value] of Object.entries(fields)) data.append(name, value);682		return fetch(`${base}/${path}`, { method: "POST", body: data });683	};684	let timer = null;685	const changed = () => {686		inspect();687		clearTimeout(timer);688		timer = setTimeout(async () => {689			const answer = await post("preview", { field, value: input.value }).catch(() => null);690			if (!answer?.ok) return;691			// Kepr's own Markdown rendering, raw HTML off: the same markup the page will carry.692			preview.innerHTML = input.value.trim() ? await answer.text() : "";693			preview.dataset.empty = input.value.trim() ? "" : "the README's words show here";694		}, 250);695	};696	const wrap = (before, after = before, fallback = "text") => {697		const [from, to] = [input.selectionStart, input.selectionEnd];698		const chosen = input.value.slice(from, to) || fallback;699		input.setRangeText(before + chosen + after, from, to);700		input.setSelectionRange(from + before.length, from + before.length + chosen.length);701		input.focus();702		changed();703	};704	const prefix = (mark) => {705		const start = input.value.lastIndexOf("\n", input.selectionStart - 1) + 1;706		input.setRangeText(mark, start, start, "end");707		input.focus();708		changed();709	};710	const upload = async (file) => {711		status.textContent = `uploading ${file.name}…`;712		const answer = await post("media", { file }).catch(() => null);713		if (!answer?.ok) {714			status.textContent = answer ? await answer.text() : "upload failed";715			return;716		}717		const { url } = await answer.json();718		const alt = file.name.replace(/\.[^.]+$/, "").replace(/[[\]]/g, "");719		input.setRangeText(720			`\n![${alt}](${url} "width=100 center")\n`,721			input.selectionStart,722			input.selectionEnd,723			"end",724		);725		status.textContent = "";726		input.focus();727		changed();728	};729	const picker = element("input", "");730	picker.type = "file";731	picker.accept = MEDIA_TYPES;732	picker.hidden = true;733	picker.addEventListener("change", () => {734		for (const file of picker.files) upload(file);735		picker.value = "";736	});737	// The picture or video under the caret, with its options, as `![alt](url "options")`.738	const underCaret = () =>739		[...input.value.matchAll(MEDIA_MARKDOWN)].find(740			(m) => input.selectionStart >= m.index && input.selectionStart <= m.index + m[0].length,741		);742	function inspect() {743		const found = field === "details" ? underCaret() : undefined;744		media.hidden = !found;745		if (!found) return;746		const words = (found[3] ?? "").split(/\s+/).filter(Boolean);747		const width = words.find((word) => word.startsWith("width="))?.slice(6) ?? "100";748		const align = words.find((word) => /^(left|center|right)$/.test(word)) ?? "center";749		const loop = words.includes("loop");750		const video = /\.(mp4|webm)$/i.test(found[2]);751		const set = (next) => {752			const options = [`width=${next.width}`, next.align, next.loop && "loop"].filter(Boolean);753			const markdown = `![${found[1]}](${found[2]} "${options.join(" ")}")`;754			const caret = input.selectionStart;755			input.setRangeText(markdown, found.index, found.index + found[0].length);756			input.setSelectionRange(caret, caret);757			changed();758		};759		const choice = (label, active, action) => {760			const b = element("button", `fv-ctrl-btn${active ? " active" : ""}`, label);761			b.type = "button";762			b.addEventListener("click", action);763			return b;764		};765		media.replaceChildren(766			element("span", "editor-label", video ? "video" : "picture"),767			...["25", "33", "50", "66", "75", "100"].map((w) =>768				choice(`${w}%`, w === width, () => set({ width: w, align, loop })),769			),770			...["left", "center", "right"].map((a) =>771				choice(a, a === align, () => set({ width, align: a, loop })),772			),773			...(video ? [choice("loop like a GIF", loop, () => set({ width, align, loop: !loop }))] : []),774		);775	}776	const save = async (value) => {777		status.textContent = "saving…";778		const answer = await post("text", { field, value }).catch(() => null);779		if (answer?.ok) location.reload();780		else status.textContent = answer ? await answer.text() : "not saved: offline?";781	};782	const cancel = () => body.replaceChildren(...kept);783	const tool = (label, title, action) => {784		const b = element("button", "fv-ctrl-btn", label);785		b.type = "button";786		b.title = title;787		b.addEventListener("click", action);788		return b;789	};790	const toolbar = element("div", "editor-toolbar mono");791	toolbar.append(792		tool("B", "bold (⌘B)", () => wrap("**")),793		tool("I", "italic (⌘I)", () => wrap("_")),794		tool("link", "link (⌘K)", () => wrap("[", "](https://)")),795		tool("code", "code", () => wrap("`")),796	);797	if (field === "details") {798		toolbar.append(799			tool("heading", "heading", () => prefix("## ")),800			tool("list", "list", () => prefix("- ")),801			tool("quote", "quote", () => prefix("> ")),802			tool("picture or video", "add a picture, GIF or video (or drop or paste one)", () =>803				picker.click(),804			),805			picker,806		);807		input.addEventListener("dragover", (event) => event.preventDefault());808		input.addEventListener("drop", (event) => {809			if (event.dataTransfer.files.length === 0) return;810			event.preventDefault();811			for (const file of event.dataTransfer.files) upload(file);812		});813		input.addEventListener("paste", (event) => {814			const files = [...event.clipboardData.files];815			if (files.length === 0) return;816			event.preventDefault();817			for (const file of files) upload(file);818		});819	}820	input.addEventListener("input", changed);821	for (const name of ["click", "keyup"]) input.addEventListener(name, inspect);822	input.addEventListener("keydown", (event) => {823		const command = event.metaKey || event.ctrlKey;824		if (event.key === "Escape") cancel();825		else if (command && event.key === "Enter") save(input.value);826		else if (command && event.key === "b") wrap("**");827		else if (command && event.key === "i") wrap("_");828		else if (command && event.key === "k") wrap("[", "](https://)");829		else return;830		event.preventDefault();831	});832	const actions = element("div", "editor-actions mono");833	actions.append(834		tool("save", "save (⌘↵)", () => save(input.value)),835		tool("cancel", "cancel (esc)", cancel),836		tool("use the README", "clear your words and show the README's again", () => save("")),837		status,838	);839	const panes = element("div", "editor-panes");840	panes.append(input, preview);841	const editor = element("div", `editor editor-${field}`);842	editor.append(toolbar, panes, media, actions);843	body.replaceChildren(editor);844	input.focus();845	changed();846}847848// Storage can be missing, refused (private windows, blocked windows) or hold anything; only a849// list of folder paths is trusted, and otherwise the tree starts closed.850function remembered(key) {851	try {852		const value = JSON.parse(localStorage.getItem(key) ?? "[]");853		return Array.isArray(value) && value.every((path) => typeof path === "string") ? value : [];854	} catch {855		return [];856	}857}858859function remember(key, value) {860	try {861		localStorage.setItem(key, JSON.stringify(value));862	} catch {}863}864865// The profile's hex backdrop already breathes in CSS; this lights a few columns at a time, as866// Kepr 2's canvas did. Nothing moves under reduced motion, including when it is switched on later.867function hexGlow() {868	const columns = document.querySelectorAll(".hex-col");869	if (columns.length === 0) return;870	const reduce = matchMedia("(prefers-reduced-motion: reduce)");871	let timer = null;872	const update = () => {873		clearInterval(timer);874		for (const column of columns) column.classList.remove("glow");875		if (reduce.matches) return;876		timer = setInterval(() => {877			const column = columns[Math.floor(Math.random() * columns.length)];878			if (document.querySelectorAll(".hex-col.glow").length >= 3) return;879			column.classList.add("glow");880			setTimeout(() => column.classList.remove("glow"), 3200);881		}, 1500);882	};883	reduce.addEventListener("change", update);884	update();885}886887// A CSS duration cannot follow a track's width, so the pace would depend on the messages; set it888// here so each row slides at its own --speed in px/s, as Kepr 2's canvas did.889function tickerPace() {890	for (const track of document.querySelectorAll(".ticker-track")) {891		const speed = Number(getComputedStyle(track).getPropertyValue("--speed"));892		if (speed > 0) track.style.animationDuration = `${track.scrollWidth / 2 / speed}s`;893	}894}895896// Widths are only final once Martian Mono has loaded.897document.fonts.ready.then(tickerPace);898timeline();899copyButtons(document);900panels();901saveLists();902atlasPicker();903repoEditor();904navbarLogin();905lineRanges();906atlas();907hexGlow();