'use strict';
// `any`: the page reads .value, .dataset and .onclick off whatever it looks up, and the
// smoke test, not the type checker, is what makes sure a selector exists.
const $ = <T extends HTMLElement = HTMLElement>(s: string, r: ParentNode = document): T => r.querySelector<T>(s)!;
const $$ = <T extends HTMLElement = HTMLElement>(s: string, r: ParentNode = document): T[] => [...r.querySelectorAll<T>(s)];
/// What went wrong, from whatever a catch caught: the page throws Errors, but a catch cannot know.
const why = (e: unknown): string => e instanceof Error ? e.message : String(e);
/// A row that opens a feed, a place or a show (the feed list, the Directory): a link to a screen
/// reader, named by what it shows, the open one marked current. Not a button, whose contents a
/// screen reader flattens, which would hide a folder's triangle inside it; as a bare div it read as
/// text, nothing to press (#298).
function asLink(el: HTMLElement, current: boolean){
  const said=(s: string)=>el.querySelector(s)?.textContent?.trim();
  const marks=$$('[role=img][aria-label],.subbed[aria-label]',el).map(m=>m.getAttribute('aria-label'));
  el.setAttribute('role','link');
  el.setAttribute('aria-label',[said('b'),said('small'),...marks,el.querySelector<HTMLElement>('.badge:not(.zero)')?.title].filter(Boolean).join(', '));
  if(current) el.setAttribute('aria-current','page');
}
const ESCAPED: Record<string,string> ={'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'};
const esc = (s: string|null|undefined) => (s??'').replace(/[&<>"']/g,c=>ESCAPED[c]);
// A feed's link, only if it is a web address: esc() keeps a javascript: or data: one working (#326).
const webUrl = (u: string|null|undefined): string|null => /^https?:\/\//i.test(u??'') ? u! : null;
// Icons: Font Awesome Free 7.3.1 by @fontawesome - https://fontawesome.com
// License - https://fontawesome.com/license/free (Icons: CC BY 4.0). Embedded as SVG, only the
// ones used, so there is no font to download and nothing is fetched from anyone else. Each takes
// the button's own colour. To add one, copy the path from svgs/<style>/<name>.svg at the same tag.
const fa=(box: string,body: string)=>`<svg class="i" viewBox="${box}" aria-hidden="true">${body}</svg>`;
/// An app-icon tile (web/signals.svg, deadair-on.svg, ...) in the mode's own variant, as the logo is.
const tile=(name: string)=>`<img class="tile onlight" src="/${name}.svg" alt=""><img class="tile ondark" src="/${name}-dark.svg" alt="">`;
const ICON: Record<string,string>={
  share:fa('0 0 512 512','<path fill="currentColor" d="M384 192c53 0 96-43 96-96s-43-96-96-96-96 43-96 96c0 5.4 .5 10.8 1.3 16L159.6 184.1c-16.9-15-39.2-24.1-63.6-24.1-53 0-96 43-96 96s43 96 96 96c24.4 0 46.6-9.1 63.6-24.1L289.3 400c-.9 5.2-1.3 10.5-1.3 16 0 53 43 96 96 96s96-43 96-96-43-96-96-96c-24.4 0-46.6 9.1-63.6 24.1L190.7 272c.9-5.2 1.3-10.5 1.3-16s-.5-10.8-1.3-16l129.7-72.1c16.9 15 39.2 24.1 63.6 24.1z"/>'), // solid/share-nodes
  plus:fa('0 0 448 512','<path fill="currentColor" d="M256 64c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 160-160 0c-17.7 0-32 14.3-32 32s14.3 32 32 32l160 0 0 160c0 17.7 14.3 32 32 32s32-14.3 32-32l0-160 160 0c17.7 0 32-14.3 32-32s-14.3-32-32-32l-160 0 0-160z"/>'), // solid/plus
  circleMinus:fa('0 0 512 512','<path fill="currentColor" d="M512 256A256 256 0 1 0 0 256a256 256 0 1 0 512 0zM184 232l144 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-144 0c-13.3 0-24-10.7-24-24s10.7-24 24-24z"/>'), // solid/circle-minus, for Unsubscribe
  play:fa('0 0 448 512','<path fill="currentColor" d="M91.2 36.9c-12.4-6.8-27.4-6.5-39.6 .7S32 57.9 32 72l0 368c0 14.1 7.5 27.2 19.6 34.4s27.2 7.5 39.6 .7l336-184c12.8-7 20.8-20.5 20.8-35.1s-8-28.1-20.8-35.1l-336-184z"/>'), // solid/play
  check:fa('0 0 448 512','<path fill="currentColor" d="M434.8 70.1c14.3 10.4 17.5 30.4 7.1 44.7l-256 352c-5.5 7.6-14 12.3-23.4 13.1s-18.5-2.7-25.1-9.3l-128-128c-12.5-12.5-12.5-32.8 0-45.3s32.8-12.5 45.3 0l101.5 101.5 234-321.7c10.4-14.3 30.4-17.5 44.7-7.1z"/>'), // solid/check
  checks:fa('0 0 384 512','<path fill="currentColor" d="M249.9 66.8c10.4-14.3 7.2-34.3-7.1-44.7s-34.3-7.2-44.7 7.1l-106 145.7-37.5-37.5c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l64 64c6.6 6.6 15.8 10 25.1 9.3s17.9-5.5 23.4-13.1l128-176zm128 136c10.4-14.3 7.2-34.3-7.1-44.7s-34.3-7.2-44.7 7.1l-170 233.7-69.5-69.5c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l96 96c6.6 6.6 15.8 10 25.1 9.3s17.9-5.5 23.4-13.1l192-264z"/>'), // solid/check-double
  // Pinned is the solid thumbtack; not pinned, the same shape outlined, as the flag had its regular
  // and solid pair (Font Awesome's free set has no regular thumbtack). Both share a viewBox padded
  // for the outline's stroke, so the two draw the same size.
  pin:fa('-18 -18 420 548','<path fill="none" stroke="currentColor" stroke-width="36" stroke-linejoin="round" d="M32 32C32 14.3 46.3 0 64 0L320 0c17.7 0 32 14.3 32 32s-14.3 32-32 32l-29.5 0 11.4 148.2c36.7 19.9 65.7 53.2 79.5 94.7l1 3c3.3 9.8 1.6 20.5-4.4 28.8s-15.7 13.3-26 13.3L32 352c-10.3 0-19.9-4.9-26-13.3s-7.7-19.1-4.4-28.8l1-3c13.8-41.5 42.8-74.8 79.5-94.7L93.5 64 64 64C46.3 64 32 49.7 32 32zM160 384l64 0 0 96c0 17.7-14.3 32-32 32s-32-14.3-32-32l0-96z"/>'), // solid/thumbtack, outlined
  pinOn:fa('-18 -18 420 548','<path fill="currentColor" d="M32 32C32 14.3 46.3 0 64 0L320 0c17.7 0 32 14.3 32 32s-14.3 32-32 32l-29.5 0 11.4 148.2c36.7 19.9 65.7 53.2 79.5 94.7l1 3c3.3 9.8 1.6 20.5-4.4 28.8s-15.7 13.3-26 13.3L32 352c-10.3 0-19.9-4.9-26-13.3s-7.7-19.1-4.4-28.8l1-3c13.8-41.5 42.8-74.8 79.5-94.7L93.5 64 64 64C46.3 64 32 49.7 32 32zM160 384l64 0 0 96c0 17.7-14.3 32-32 32s-32-14.3-32-32l0-96z"/>'), // solid/thumbtack
  scan:fa('0 0 512 512','<path fill="currentColor" d="M65.9 228.5c13.3-93 93.4-164.5 190.1-164.5 53 0 101 21.5 135.8 56.2 .2 .2 .4 .4 .6 .6l7.6 7.2-47.9 0c-17.7 0-32 14.3-32 32s14.3 32 32 32l128 0c17.7 0 32-14.3 32-32l0-128c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 53.4-11.3-10.7C390.5 28.6 326.5 0 256 0 127 0 20.3 95.4 2.6 219.5 .1 237 12.2 253.2 29.7 255.7s33.7-9.7 36.2-27.1zm443.5 64c2.5-17.5-9.7-33.7-27.1-36.2s-33.7 9.7-36.2 27.1c-13.3 93-93.4 164.5-190.1 164.5-53 0-101-21.5-135.8-56.2-.2-.2-.4-.4-.6-.6l-7.6-7.2 47.9 0c17.7 0 32-14.3 32-32s-14.3-32-32-32L32 320c-8.5 0-16.7 3.4-22.7 9.5S-.1 343.7 0 352.3l1 127c.1 17.7 14.6 31.9 32.3 31.7S65.2 496.4 65 478.7l-.4-51.5 10.7 10.1c46.3 46.1 110.2 74.7 180.7 74.7 129 0 235.7-95.4 253.4-219.5z"/>'), // solid/arrows-rotate
  download:fa('0 0 448 512','<path fill="currentColor" d="M256 32c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 210.7-41.4-41.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3l96 96c12.5 12.5 32.8 12.5 45.3 0l96-96c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L256 242.7 256 32zM64 320c-35.3 0-64 28.7-64 64l0 32c0 35.3 28.7 64 64 64l320 0c35.3 0 64-28.7 64-64l0-32c0-35.3-28.7-64-64-64l-46.9 0-56.6 56.6c-31.2 31.2-81.9 31.2-113.1 0L110.9 320 64 320zm304 56a24 24 0 1 1 0 48 24 24 0 1 1 0-48z"/>'), // solid/download
  keep:fa('0 0 512 512','<path fill="currentColor" d="M256 464a208 208 0 1 1 0-416 208 208 0 1 1 0 416zM256 0a256 256 0 1 0 0 512 256 256 0 1 0 0-512zM244.7 387.3c6.2 6.2 16.4 6.2 22.6 0l104-104c4.6-4.6 5.9-11.5 3.5-17.4S366.5 256 360 256l-72 0 0-104c0-13.3-10.7-24-24-24l-16 0c-13.3 0-24 10.7-24 24l0 104-72 0c-6.5 0-12.3 3.9-14.8 9.9s-1.1 12.9 3.5 17.4l104 104z"/>'), // regular/circle-down
  kept:fa('0 0 512 512','<path fill="currentColor" d="M256 0a256 256 0 1 0 0 512 256 256 0 1 0 0-512zM244.7 387.3l-104-104c-4.6-4.6-5.9-11.5-3.5-17.4s8.3-9.9 14.8-9.9l56 0 0-96c0-17.7 14.3-32 32-32l32 0c17.7 0 32 14.3 32 32l0 96 56 0c6.5 0 12.3 3.9 14.8 9.9s1.1 12.9-3.5 17.4l-104 104c-6.2 6.2-16.4 6.2-22.6 0z"/>'), // solid/circle-down
  save:fa('0 0 448 512','<path fill="currentColor" d="M64 32C28.7 32 0 60.7 0 96L0 416c0 35.3 28.7 64 64 64l320 0c35.3 0 64-28.7 64-64l0-242.7c0-17-6.7-33.3-18.7-45.3L352 50.7C340 38.7 323.7 32 306.7 32L64 32zm32 96c0-17.7 14.3-32 32-32l160 0c17.7 0 32 14.3 32 32l0 64c0 17.7-14.3 32-32 32l-160 0c-17.7 0-32-14.3-32-32l0-64zM224 288a64 64 0 1 1 0 128 64 64 0 1 1 0-128z"/>'), // solid/floppy-disk
  trash:fa('0 0 448 512','<path fill="currentColor" d="M136.7 5.9C141.1-7.2 153.3-16 167.1-16l113.9 0c13.8 0 26 8.8 30.4 21.9L320 32 416 32c17.7 0 32 14.3 32 32s-14.3 32-32 32L32 96C14.3 96 0 81.7 0 64S14.3 32 32 32l96 0 8.7-26.1zM32 144l384 0 0 304c0 35.3-28.7 64-64 64L96 512c-35.3 0-64-28.7-64-64l0-304zm88 64c-13.3 0-24 10.7-24 24l0 192c0 13.3 10.7 24 24 24s24-10.7 24-24l0-192c0-13.3-10.7-24-24-24zm104 0c-13.3 0-24 10.7-24 24l0 192c0 13.3 10.7 24 24 24s24-10.7 24-24l0-192c0-13.3-10.7-24-24-24zm104 0c-13.3 0-24 10.7-24 24l0 192c0 13.3 10.7 24 24 24s24-10.7 24-24l0-192c0-13.3-10.7-24-24-24z"/>'), // solid/trash-can
  open:fa('0 0 512 512','<path fill="currentColor" d="M320 0c-17.7 0-32 14.3-32 32s14.3 32 32 32l82.7 0-201.4 201.4c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0L448 109.3 448 192c0 17.7 14.3 32 32 32s32-14.3 32-32l0-160c0-17.7-14.3-32-32-32L320 0zM80 96C35.8 96 0 131.8 0 176L0 432c0 44.2 35.8 80 80 80l256 0c44.2 0 80-35.8 80-80l0-80c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 80c0 8.8-7.2 16-16 16L80 448c-8.8 0-16-7.2-16-16l0-256c0-8.8 7.2-16 16-16l80 0c17.7 0 32-14.3 32-32s-14.3-32-32-32L80 96z"/>'), // solid/arrow-up-right-from-square
  settings:fa('0 0 512 512','<path fill="currentColor" d="M195.1 9.5C198.1-5.3 211.2-16 226.4-16l59.8 0c15.2 0 28.3 10.7 31.3 25.5L332 79.5c14.1 6 27.3 13.7 39.3 22.8l67.8-22.5c14.4-4.8 30.2 1.2 37.8 14.4l29.9 51.8c7.6 13.2 4.9 29.8-6.5 39.9L447 233.3c.9 7.4 1.3 15 1.3 22.7s-.5 15.3-1.3 22.7l53.4 47.5c11.4 10.1 14 26.8 6.5 39.9l-29.9 51.8c-7.6 13.1-23.4 19.2-37.8 14.4l-67.8-22.5c-12.1 9.1-25.3 16.7-39.3 22.8l-14.4 69.9c-3.1 14.9-16.2 25.5-31.3 25.5l-59.8 0c-15.2 0-28.3-10.7-31.3-25.5l-14.4-69.9c-14.1-6-27.2-13.7-39.3-22.8L73.5 432.3c-14.4 4.8-30.2-1.2-37.8-14.4L5.8 366.1c-7.6-13.2-4.9-29.8 6.5-39.9l53.4-47.5c-.9-7.4-1.3-15-1.3-22.7s.5-15.3 1.3-22.7L12.3 185.8c-11.4-10.1-14-26.8-6.5-39.9L35.7 94.1c7.6-13.2 23.4-19.2 37.8-14.4l67.8 22.5c12.1-9.1 25.3-16.7 39.3-22.8L195.1 9.5zM256.3 336a80 80 0 1 0 -.6-160 80 80 0 1 0 .6 160z"/>'), // solid/gear
  close:fa('0 0 384 512','<path fill="currentColor" d="M55.1 73.4c-12.5-12.5-32.8-12.5-45.3 0s-12.5 32.8 0 45.3L147.2 256 9.9 393.4c-12.5 12.5-12.5 32.8 0 45.3s32.8 12.5 45.3 0L192.5 301.3 329.9 438.6c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L237.8 256 375.1 118.6c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0L192.5 210.7 55.1 73.4z"/>'), // solid/xmark
  menu:fa('0 0 448 512','<path fill="currentColor" d="M0 96C0 78.3 14.3 64 32 64l384 0c17.7 0 32 14.3 32 32s-14.3 32-32 32L32 128C14.3 128 0 113.7 0 96zM0 256c0-17.7 14.3-32 32-32l384 0c17.7 0 32 14.3 32 32s-14.3 32-32 32L32 288c-17.7 0-32-14.3-32-32zM448 416c0 17.7-14.3 32-32 32L32 448c-17.7 0-32-14.3-32-32s14.3-32 32-32l384 0c17.7 0 32 14.3 32 32z"/>'), // solid/bars
  directory:fa('0 0 448 512','<path fill="currentColor" d="M0 96C0 60.7 28.7 32 64 32l320 0c35.3 0 64 28.7 64 64l0 320c0 35.3-28.7 64-64 64L64 480c-35.3 0-64-28.7-64-64L0 96zm64 0l0 64 64 0 0-64-64 0zm320 0l-192 0 0 64 192 0 0-64zM64 224l0 64 64 0 0-64-64 0zm320 0l-192 0 0 64 192 0 0-64zM64 352l0 64 64 0 0-64-64 0zm320 0l-192 0 0 64 192 0 0-64z"/>'), // solid/table-list
  all:fa('0 0 512 512','<path fill="currentColor" d="M232.5 5.2c14.9-6.9 32.1-6.9 47 0l218.6 101c8.5 3.9 13.9 12.4 13.9 21.8s-5.4 17.9-13.9 21.8l-218.6 101c-14.9 6.9-32.1 6.9-47 0L13.9 149.8C5.4 145.8 0 137.3 0 128s5.4-17.9 13.9-21.8L232.5 5.2zM48.1 218.4l164.3 75.9c27.7 12.8 59.6 12.8 87.3 0l164.3-75.9 34.1 15.8c8.5 3.9 13.9 12.4 13.9 21.8s-5.4 17.9-13.9 21.8l-218.6 101c-14.9 6.9-32.1 6.9-47 0L13.9 277.8C5.4 273.8 0 265.3 0 256s5.4-17.9 13.9-21.8l34.1-15.8zM13.9 362.2l34.1-15.8 164.3 75.9c27.7 12.8 59.6 12.8 87.3 0l164.3-75.9 34.1 15.8c8.5 3.9 13.9 12.4 13.9 21.8s-5.4 17.9-13.9 21.8l-218.6 101c-14.9 6.9-32.1 6.9-47 0L13.9 405.8C5.4 401.8 0 393.3 0 384s5.4-17.9 13.9-21.8z"/>'), // solid/layer-group
  unread:fa('0 0 512 512','<path fill="currentColor" d="M48 64c-26.5 0-48 21.5-48 48 0 15.1 7.1 29.3 19.2 38.4l208 156c17.1 12.8 40.5 12.8 57.6 0l208-156c12.1-9.1 19.2-23.3 19.2-38.4 0-26.5-21.5-48-48-48L48 64zM0 196L0 384c0 35.3 28.7 64 64 64l384 0c35.3 0 64-28.7 64-64l0-188-198.4 148.8c-34.1 25.6-81.1 25.6-115.2 0L0 196z"/>'), // solid/envelope: a closed letter, not a record button
  audio:fa('0 0 448 512','<path fill="currentColor" d="M64 224c0-88.4 71.6-160 160-160s160 71.6 160 160l0 37.5c-10-3.5-20.8-5.5-32-5.5l-16 0c-26.5 0-48 21.5-48 48l0 128c0 26.5 21.5 48 48 48l16 0c53 0 96-43 96-96l0-160C448 100.3 347.7 0 224 0S0 100.3 0 224L0 384c0 53 43 96 96 96l16 0c26.5 0 48-21.5 48-48l0-128c0-26.5-21.5-48-48-48l-16 0c-11.2 0-22 1.9-32 5.5L64 224z"/>'), // solid/headphones
  video:fa('0 0 576 512','<path fill="currentColor" d="M96 64c-35.3 0-64 28.7-64 64l0 256c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-256c0-35.3-28.7-64-64-64L96 64zM464 336l73.5 58.8c4.2 3.4 9.4 5.2 14.8 5.2 13.1 0 23.7-10.6 23.7-23.7l0-240.6c0-13.1-10.6-23.7-23.7-23.7-5.4 0-10.6 1.8-14.8 5.2L464 176 464 336z"/>'), // solid/video
  image:fa('0 0 448 512','<path fill="currentColor" d="M64 32C28.7 32 0 60.7 0 96L0 416c0 35.3 28.7 64 64 64l320 0c35.3 0 64-28.7 64-64l0-320c0-35.3-28.7-64-64-64L64 32zm64 80a48 48 0 1 1 0 96 48 48 0 1 1 0-96zM272 224c8.4 0 16.1 4.4 20.5 11.5l88 144c4.5 7.4 4.7 16.7 .5 24.3S368.7 416 360 416L88 416c-8.9 0-17.2-5-21.3-12.9s-3.5-17.5 1.6-24.8l56-80c4.5-6.4 11.8-10.2 19.7-10.2s15.2 3.8 19.7 10.2l26.4 37.8 61.4-100.5c4.4-7.1 12.1-11.5 20.5-11.5z"/>'), // solid/image
  doc:fa('0 0 576 512','<path fill="currentColor" d="M96 0C60.7 0 32 28.7 32 64l0 384c0 35.3 28.7 64 64 64l80 0 0-112c0-35.3 28.7-64 64-64l176 0 0-165.5c0-17-6.7-33.3-18.7-45.3L290.7 18.7C278.7 6.7 262.5 0 245.5 0L96 0zM357.5 176L264 176c-13.3 0-24-10.7-24-24L240 58.5 357.5 176zM240 380c-11 0-20 9-20 20l0 128c0 11 9 20 20 20s20-9 20-20l0-28 12 0c33.1 0 60-26.9 60-60s-26.9-60-60-60l-32 0zm32 80l-12 0 0-40 12 0c11 0 20 9 20 20s-9 20-20 20zm96-80c-11 0-20 9-20 20l0 128c0 11 9 20 20 20l32 0c28.7 0 52-23.3 52-52l0-64c0-28.7-23.3-52-52-52l-32 0zm20 128l0-88 12 0c6.6 0 12 5.4 12 12l0 64c0 6.6-5.4 12-12 12l-12 0zm88-108l0 128c0 11 9 20 20 20s20-9 20-20l0-44 28 0c11 0 20-9 20-20s-9-20-20-20l-28 0 0-24 28 0c11 0 20-9 20-20s-9-20-20-20l-48 0c-11 0-20 9-20 20z"/>'), // solid/file-pdf
  torrent:fa('0 0 448 512','<path fill="currentColor" d="M0 176L0 288C0 411.7 100.3 512 224 512S448 411.7 448 288l0-112-128 0 0 112c0 53-43 96-96 96s-96-43-96-96l0-112-128 0zm0-48l128 0 0-64c0-17.7-14.3-32-32-32L32 32C14.3 32 0 46.3 0 64l0 64zm320 0l128 0 0-64c0-17.7-14.3-32-32-32l-64 0c-17.7 0-32 14.3-32 32l0 64z"/>'), // solid/magnet
  file:fa('0 0 384 512','<path fill="currentColor" d="M64 0C28.7 0 0 28.7 0 64L0 448c0 35.3 28.7 64 64 64l256 0c35.3 0 64-28.7 64-64l0-277.5c0-17-6.7-33.3-18.7-45.3L258.7 18.7C246.7 6.7 230.5 0 213.5 0L64 0zM325.5 176L232 176c-13.3 0-24-10.7-24-24L208 58.5 325.5 176z"/>'), // solid/file
  copy:fa('0 0 448 512','<path fill="currentColor" d="M192 0c-35.3 0-64 28.7-64 64l0 256c0 35.3 28.7 64 64 64l192 0c35.3 0 64-28.7 64-64l0-200.6c0-17.4-7.1-34.1-19.7-46.2L370.6 17.8C358.7 6.4 342.8 0 326.3 0L192 0zM64 128c-35.3 0-64 28.7-64 64L0 448c0 35.3 28.7 64 64 64l192 0c35.3 0 64-28.7 64-64l0-16-64 0 0 16-192 0 0-256 16 0 0-64-16 0z"/>'), // solid/copy
  signout:fa('0 0 512 512','<path fill="currentColor" d="M505 273c9.4-9.4 9.4-24.6 0-33.9L361 95c-6.9-6.9-17.2-8.9-26.2-5.2S320 102.3 320 112l0 80-112 0c-26.5 0-48 21.5-48 48l0 32c0 26.5 21.5 48 48 48l112 0 0 80c0 9.7 5.8 18.5 14.8 22.2s19.3 1.7 26.2-5.2L505 273zM160 96c17.7 0 32-14.3 32-32s-14.3-32-32-32L96 32C43 32 0 75 0 128L0 384c0 53 43 96 96 96l64 0c17.7 0 32-14.3 32-32s-14.3-32-32-32l-64 0c-17.7 0-32-14.3-32-32l0-256c0-17.7 14.3-32 32-32l64 0z"/>'), // solid/right-from-bracket
  back:fa('0 0 512 512','<path fill="currentColor" d="M24 192l144 0c9.7 0 18.5-5.8 22.2-14.8s1.7-19.3-5.2-26.2l-46.7-46.7c75.3-58.6 184.3-53.3 253.5 15.9 75 75 75 196.5 0 271.5s-196.5 75-271.5 0c-10.2-10.2-19-21.3-26.4-33-9.5-14.9-29.3-19.3-44.2-9.8s-19.3 29.3-9.8 44.2C49.7 408.7 61.4 423.5 75 437 175 537 337 537 437 437S537 175 437 75C342.8-19.3 193.3-24.7 92.7 58.8L41 7C34.1 .2 23.8-1.9 14.8 1.8S0 14.3 0 24L0 168c0 13.3 10.7 24 24 24z"/>'), // solid/rotate-left
  fwd:fa('0 0 512 512','<path fill="currentColor" d="M488 192l-144 0c-9.7 0-18.5-5.8-22.2-14.8s-1.7-19.3 5.2-26.2l46.7-46.7c-75.3-58.6-184.3-53.3-253.5 15.9-75 75-75 196.5 0 271.5s196.5 75 271.5 0c8.2-8.2 15.5-16.9 21.9-26.1 10.1-14.5 30.1-18 44.6-7.9s18 30.1 7.9 44.6c-8.5 12.2-18.2 23.8-29.1 34.7-100 100-262.1 100-362 0S-25 175 75 75c94.3-94.3 243.7-99.6 344.3-16.2L471 7c6.9-6.9 17.2-8.9 26.2-5.2S512 14.3 512 24l0 144c0 13.3-10.7 24-24 24z"/>'), // solid/rotate-right
  pause:fa('0 0 384 512','<path fill="currentColor" d="M48 32C21.5 32 0 53.5 0 80L0 432c0 26.5 21.5 48 48 48l64 0c26.5 0 48-21.5 48-48l0-352c0-26.5-21.5-48-48-48L48 32zm224 0c-26.5 0-48 21.5-48 48l0 352c0 26.5 21.5 48 48 48l64 0c26.5 0 48-21.5 48-48l0-352c0-26.5-21.5-48-48-48l-64 0z"/>'), // solid/pause
  alert:fa('0 0 128 512','<path fill="currentColor" d="M64 432c22.1 0 40 17.9 40 40s-17.9 40-40 40-40-17.9-40-40c0-22.1 17.9-40 40-40zM64 0c26.5 0 48 21.5 48 48 0 .6 0 1.1 0 1.7l-16 304c-.9 17-15 30.3-32 30.3S33 370.7 32 353.7L16 49.7c0-.6 0-1.1 0-1.7 0-26.5 21.5-48 48-48z"/>'), // solid/exclamation
  admin:fa('0 0 576 512','<path fill="currentColor" d="M70.8-6.7c5.4-5.4 13.8-6.2 20.2-2L209.9 70.5c8.9 5.9 14.2 15.9 14.2 26.6l0 49.6 90.8 90.8c33.3-15 73.9-8.9 101.2 18.5L542.2 382.1c18.7 18.7 18.7 49.1 0 67.9l-60.1 60.1c-18.7 18.7-49.1 18.7-67.9 0L288.1 384c-27.4-27.4-33.5-67.9-18.5-101.2l-90.8-90.8-49.6 0c-10.7 0-20.7-5.3-26.6-14.2L23.4 58.9c-4.2-6.3-3.4-14.8 2-20.2L70.8-6.7zm145 303.5c-6.3 36.9 2.3 75.9 26.2 107.2l-94.9 95c-28.1 28.1-73.7 28.1-101.8 0s-28.1-73.7 0-101.8l135.4-135.5 35.2 35.1zM384.1 0c20.1 0 39.4 3.7 57.1 10.5 10 3.8 11.8 16.5 4.3 24.1L388.8 91.3c-3 3-4.7 7.1-4.7 11.3l0 41.4c0 8.8 7.2 16 16 16l41.4 0c4.2 0 8.3-1.7 11.3-4.7l56.7-56.7c7.6-7.5 20.3-5.7 24.1 4.3 6.8 17.7 10.5 37 10.5 57.1 0 43.2-17.2 82.3-45 111.1l-49.1-49.1c-33.1-33-78.5-45.7-121.1-38.4l-56.8-56.8 0-29.7-.2-5c-.8-12.4-4.4-24.3-10.5-34.9 29.4-35 73.4-57.2 122.7-57.3z"/>'), // solid/screwdriver-wrench
  caret:fa('0 0 256 512','<path fill="currentColor" d="M249.3 235.8c10.2 12.6 9.5 31.1-2.2 42.8l-128 128c-9.2 9.2-22.9 11.9-34.9 6.9S64.5 396.9 64.5 384l0-256c0-12.9 7.8-24.6 19.8-29.6s25.7-2.2 34.9 6.9l128 128 2.2 2.4z"/>'), // solid/caret-right
  left:fa('0 0 512 512','<path fill="currentColor" d="M9.4 233.4c-12.5 12.5-12.5 32.8 0 45.3l160 160c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L109.3 288 480 288c17.7 0 32-14.3 32-32s-14.3-32-32-32l-370.7 0 105.4-105.4c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0l-160 160z"/>'), // solid/arrow-left
  // Drawn here: Font Awesome's free set has no AirPlay. A screen with a triangle under it, as Apple's.
  airplay:fa('0 0 512 512','<path fill="currentColor" d="M64 48l384 0c26.5 0 48 21.5 48 48l0 256c0 26.5-21.5 48-48 48l-56 0 0-56 48 0 0-240-368 0 0 240 48 0 0 56-56 0c-26.5 0-48-21.5-48-48L16 96c0-26.5 21.5-48 48-48zM256 288l144 176-288 0z"/>'),
  subbed:fa('0 0 512 512','<path fill="currentColor" d="M256 512a256 256 0 1 1 0-512 256 256 0 1 1 0 512zM374 145.7c-10.7-7.8-25.7-5.4-33.5 5.3L221.1 315.2 169 263.1c-9.4-9.4-24.6-9.4-33.9 0s-9.4 24.6 0 33.9l72 72c5 5 11.8 7.5 18.8 7s13.4-4.1 17.5-9.8L379.3 179.2c7.8-10.7 5.4-25.7-5.3-33.5z"/>'), // solid/circle-check
};
// What is playing, as the icon's EQ bars; the stylesheet moves them.
const EQ='<span class="eq" aria-hidden="true"><i></i><i></i><i></i></span>';
// One meaning per icon: minus unsubscribes, x closes or cancels, plus adds or subscribes, and a
// dialog's confirm button carries the icon of what it does. Words go in the tooltip.
// The page's own buttons name their icon; this draws it in, ahead of any label they carry.
for(const b of $$('[data-icon]')) b.insertAdjacentHTML('afterbegin',ICON[b.dataset.icon!]);

/// A search box with an x at its right end that clears it, shown once something is typed (#291).
const searchBox=(input: string, cls='')=>
  `<span class="clearable ${cls}">${input}<button type="button" class="clearx" title="Clear" aria-label="Clear">${ICON.close}</button></span>`;
// Every box's x, wherever it is drawn: cleared as if the typing were deleted, so the box's own input
// handler runs and its list comes back whole.
document.addEventListener('click',(e: MouseEvent)=>{
  const x=(e.target as Element).closest?.('.clearx');
  const box=x?.parentElement?.querySelector('input');
  if(!box) return;
  box.value='';
  box.dispatchEvent(new Event('input',{bubbles:true}));
  box.focus();
});

/// An episode whose DeadAir copy is still being made: it plays as it is until then, and the line
/// becomes how much shorter it is once the copy is ready (the dead_air event).
const DEAD_PENDING='<span class="dapend" title="DeadAir is still working on this episode. Until it is done, it plays at its full length.">Cutting dead air…</span>';
/// What DeadAir took off an episode, as the list says it.
function shorter(secs: number){ return secs<60?`${secs} s shorter`:`${Math.round(secs/60)} min shorter`; }
/// A total of time saved: "3 h 12 min", "12 min", "40 s".
function spanText(secs: number){
  const h=Math.floor(secs/3600), m=Math.floor(secs%3600/60);
  return h?`${h} h ${m} min`:m?`${m} min`:`${secs} s`;
}
/// One trace for each thing you do (#190): the requests a tap or a key sets off share a trace id,
/// sent as traceparent, so Tempo shows them together. getRandomValues, not randomUUID, which a
/// LAN address over plain HTTP does not have. A trace ends after a minute with no request in it:
/// the requests a live update or a woken laptop sets off hours later used to join the last tap's
/// trace, which then lasted nine hours (#219). A play's position saves, every ten seconds, keep it.
/// A tap or a key is the trace's root span (#376): its requests name it as their parent, and once
/// the next one begins, or the page is hidden, the page reports it, from the tap to its last
/// answer, for ipx to send on to Tempo with these ids. Only requests begun while the tap is still
/// at work count towards it: one of its own in flight, or within two seconds of the tap or its last
/// answer, as a request an answer sets off is. A live update's refresh thirteen seconds later joined
/// the trace and made a tap answered in 0.9 s read as 15 (#379).
let traceId='', traceAt=0, rootId='', rootAt=0, rootKind='', answeredAt=0, tapBusy=0;
const hex=(n: number)=>Array.from(crypto.getRandomValues(new Uint8Array(n)),b=>b.toString(16).padStart(2,'0')).join('');
function endTap(){
  const kind=rootKind;
  // Cleared first: report's traceparent can start a new trace, whose newTrace calls endTap again,
  // and with the tap still open that recursed until the stack ran out (#378).
  rootKind='';
  if(kind && answeredAt>rootAt)
    report('tap',{trace:traceId,span:rootId,start:rootAt,ms:Math.min(answeredAt-rootAt,60_000),msg:kind});
}
function newTrace(kind: string){
  endTap();
  traceId=hex(16); rootId=hex(8); rootAt=Date.now(); rootKind=kind; answeredAt=0; tapBusy=0;
}
for(const t of ['pointerdown','keydown']) window.addEventListener(t,()=>{ newTrace(t); traceAt=Date.now(); },{capture:true,passive:true});
window.addEventListener('pagehide',endTap);
document.addEventListener('visibilitychange',()=>{ if(document.visibilityState==='hidden') endTap(); });
function traceparent(){
  const now=Date.now();
  // No tap to hang from: a live update's or a timer's requests, a trace with no root of its own.
  if(!traceId||now-traceAt>60_000) newTrace('');
  traceAt=now;
  return `00-${traceId}-${rootId}-01`;
}

/// Something that went wrong, or how long something took, in the browser, for the server's log
/// (#190). The same thing at most once a minute: a failure in a loop would otherwise send a line
/// a frame.
const reported=new Map<string,number>();
function report(ev: string, o: Record<string,any>={}){
  // A timing comes of something someone did, not a loop, so every one is sent.
  const key=ev+(o.msg||''), now=Date.now();
  if(o.msg==='signed out' || (o.ms==null && now-(reported.get(key)||0)<60_000)) return;
  reported.set(key,now);
  fetch('/api/client',{method:'POST',keepalive:true,headers:{'Content-Type':'application/json',traceparent:traceparent()},
    body:JSON.stringify({ev,...o})}).catch(()=>{});
}
window.addEventListener('error',e=>report('page_error',{msg:String(e.message||e.error||'error'),src:e.filename,line:e.lineno}));
window.addEventListener('unhandledrejection',e=>report('rejection',{msg:String(e.reason?.message||e.reason)}));

async function api(url: string, opts?: RequestInit): Promise<any>{
  // The browser's "Failed to fetch" said nothing anyone could act on (#304).
  const tp=traceparent(), mine=traceId;
  const taps=!!rootKind&&(tapBusy>0||Date.now()-Math.max(rootAt,answeredAt)<2000);
  if(taps) tapBusy++;
  const r = await fetch(url,{headers:{'Content-Type':'application/json',traceparent:tp},...opts})
    .catch(()=>{ throw new Error('Unable to reach iPX. Check your connection and try again.'); })
    .finally(()=>{ if(taps&&mine===traceId) tapBusy--; });
  // The tap lasts until the last answer to what it set off.
  if(taps&&mine===traceId) answeredAt=Date.now();
  if(r.status===401){ location.href='/login'; throw new Error('signed out'); }
  if(!r.ok){
    // A page in place of ipx's words is Cloudflare or Caddy answering for it: the message became a
    // whole 502 page (#219). A 500's words are the daemon's own workings, which its log already
    // has; they are not something to show the person who pressed the button (#304).
    const said=!/html/.test(r.headers.get('Content-Type')||'')&&await r.text().catch(()=>'');
    throw new Error(r.status===500 ? 'iPX could not do that just now. Try again in a minute.'
      : said || 'Unable to reach iPX just now. Try again in a minute.');
  }
  return r.status===204?null:r.json().catch((): null=>null);
}
// navigator.clipboard only exists in a secure context. Served over plain HTTP on a LAN
// address it is undefined, so fall back to the old selection-based copy.
async function copyText(text: string,btn?: HTMLElement){
  const flash=(ok: boolean)=>{
    if(!btn) return;
    // The button is an icon, so it is the markup that has to come back, not just its text.
    const was=btn.innerHTML;
    btn.textContent=ok?'Copied':'Failed';
    setTimeout(()=>btn.innerHTML=was,1300);
  };
  try{
    if(navigator.clipboard&&window.isSecureContext){
      await navigator.clipboard.writeText(text);
    }else{
      const ta=document.createElement('textarea');
      ta.value=text; ta.setAttribute('readonly','');
      ta.style.cssText='position:fixed;top:-1000px;opacity:0';
      document.body.appendChild(ta);
      ta.select(); ta.setSelectionRange(0,ta.value.length);
      const ok=document.execCommand('copy');
      ta.remove();
      if(!ok) throw new Error('copy rejected');
    }
    flash(true);
  }catch(e){
    flash(false);
    toast('Could not copy automatically — select the URL and copy it manually',true);
  }
}

/// The system's share sheet where there is one (phones, Safari, Edge), the clipboard elsewhere.
/// Asks first when the address looks like it carries your own access to a paid or private
/// feed: a Patreon feed's token, or a key, token or password in it, which would hand whoever
/// gets it your subscription (issue #48).
///
/// ponytail: a guess from the address. A private feed whose key has another name is shared
/// without asking; add its pattern here when one turns up.
async function share(title: string, url: string, btn?: HTMLElement){
  if(/patreon\.com\/|\/\/[^/]*@|[?&][^=]*(auth|token|key|secret|pass|sig)[^=]*=/i.test(url)
    && !confirm('This address looks like it includes your own access to the feed, and anyone you '
      +'send it to could use it as you.\n\nShare it anyway?')) return;
  if(navigator.share){
    // Cancelling the sheet rejects too, and is not a failure worth a word.
    try{ await navigator.share({title, url}); }
    catch(e){ if((e as Error)?.name!=='AbortError') toast(why(e),true); }
    return;
  }
  await copyText(url,btn);
  toast('Link copied');
}

function toast(msg: string, bad?: boolean){
  const t=document.createElement('div'), box=$('#toasts');
  t.className='toast'+(bad?' bad':''); t.textContent=msg;
  const go=()=>{t.style.opacity='0';t.style.transition='opacity .3s';setTimeout(()=>t.remove(),320)};
  // An error stays until it is put away: gone after six seconds, it was easy to miss and could not
  // be read again (#303).
  if(bad){
    const x=document.createElement('button');
    x.type='button'; x.className='toastx'; x.title='Dismiss'; x.setAttribute('aria-label','Dismiss'); x.innerHTML=ICON.close;
    x.onclick=go; t.appendChild(x);
  }else setTimeout(go,3200);
  box.appendChild(t);
  // A run of failed downloads would otherwise stack errors up the screen.
  while(box.children.length>4) box.firstElementChild!.remove();
}
const clock = (s: number) => {
  s=Math.max(0,Math.floor(s||0));
  const h=Math.floor(s/3600),m=Math.floor(s%3600/60),x=s%60;
  return h?`${h}:${String(m).padStart(2,'0')}:${String(x).padStart(2,'0')}`:`${m}:${String(x).padStart(2,'0')}`;
};
const ago = (t: number|null) => {
  if(!t) return 'never';
  const d=(Date.now()/1000)-t;
  if(d<3600) return Math.max(1,Math.round(d/60))+'m ago';
  if(d<86400) return Math.round(d/3600)+'h ago';
  if(d<2592000) return Math.round(d/86400)+'d ago';
  return new Date(t*1000).toLocaleDateString(undefined,{month:'short',day:'numeric',year:'numeric'});
};
const dateOf = (t: number|null) => t?new Date(t*1000).toLocaleDateString(undefined,{month:'short',day:'numeric',year:'numeric'}):'';
// A podcast episode is tens of MB, an article's image a few KB: whole MB made the small ones "0 MB".
const mb = (n: number|null) => !n?'' : n<1048576?Math.max(1,Math.round(n/1024))+' KB'
  : n<1073741824?Math.round(n/1048576)+' MB' : (n/1073741824).toFixed(1)+' GB';
const initials = (s: string|null) => (s||'?').replace(/[^A-Za-z0-9 ]/g,'').split(/\s+/).filter(Boolean).slice(0,2).map(w=>w[0]).join('').toUpperCase()||'?';
const plural=(n: number,word: string)=>`${n} ${word}${n===1?'':'s'}`;
// An initials tile takes one of these, by a hash of the name, so neighbours rarely match.
const TINTS=['var(--accent)','var(--good)','var(--dim)','color-mix(in srgb,var(--accent),var(--good))'];
const tint=(name: string)=>{ let h=0; for(const c of name||'?') h=(h*31+c.charCodeAt(0))>>>0; return TINTS[h%TINTS.length]; };
function tileHTML(name: string,cls?: string){
  return `<div class="art ini ${cls||''}" style="--tint:${tint(name)}">${esc(initials(name))}</div>`;
}
/// Every image a feed names comes from iPX, which keeps a copy: fast after the first time, and
/// no publisher's server asked on every visit. It began with http-only artwork, which the https
/// page could not load (#90).
function artSrc(url: string){
  return /^https?:\/\//i.test(url) ? '/api/art?u='+encodeURIComponent(url) : url;
}
function artHTML(url: string | null | undefined, name: string, cls?: string){
  return url
    ? `<img class="art ${cls||''}" src="${esc(artSrc(url))}" alt="" loading="lazy" onerror="this.outerHTML=${esc(JSON.stringify(tileHTML(name,cls)))}">`
    : tileHTML(name,cls);
}
/// A folder's tile is its first four shows' art. With fewer than four to show, the folder's own.
function folderArt(f: Feed,kids: Feed[]){
  const art=kids.filter(c=>c.image).slice(0,4);
  if(art.length<4) return artHTML(f.image,f.title||f.id);
  // Tinted underneath, so art that fails to load leaves colour behind rather than a hole.
  return `<div class="art ini mosaic" style="--tint:${tint(f.title||f.id)}">${art.map(c=>
    `<img src="${esc(artSrc(c.image!))}" alt="" loading="lazy" onerror="this.style.visibility='hidden'">`).join('')}</div>`;
}

/// The sidebar slides over the page on a phone, so it needs a scrim to tap away.
function nav(on: boolean){ $('#sidebar').classList.toggle('open',on); $('#scrim').hidden=!on; }

/* ---------------- state ---------------- */
const S: State = {
  feeds:[], signals:[],
  // Which feed (or place) and which tab were open last time, so a refresh lands back where
  // you were instead of jumping to the first feed alphabetically.
  feed:(()=>{ try{ return localStorage.getItem('ipx.feed'); }catch{ return null; } })(),
  entries:[], total:0, offset:0, more:false,
  filter:(()=>{ try{ return localStorage.getItem('ipx.filter'); }catch{ return null; } })()||'all',
  q:'', sel:null, me:null,
  // The item table's order, kept across visits. The server sorts: a list arrives fifty at a time.
  sort:(()=>{ try{ return JSON.parse(localStorage.getItem('ipx.sort')??'null'); }catch{ return null; } })()
    ||{col:'published',dir:'desc'},
};
const LIMIT = 50;

const UNITS = [['m','minutes'],['h','hours'],['d','days'],['w','weeks']];
const UNIT_MINS: Record<string,number> = {m:1, h:60, d:1440, w:10080};

/// Largest unit that divides evenly, so 120 reads "2 hours" not "120 minutes".
function splitEvery(m: number){
  if(!m) return {n:1, u:'h'};
  for(const u of ['w','d','h']) if(m % UNIT_MINS[u] === 0) return {n:m/UNIT_MINS[u], u};
  return {n:m, u:'m'};
}
function unitOptions(sel: string){
  return UNITS.map(([v,l]) =>
    `<option value="${v}"${sel===v?' selected':''}>${l}</option>`).join('');
}
function everyText(m: number){
  if(!m) return '\u2014';
  const {n,u} = splitEvery(m);
  const name = {m:'min', h:'hour', d:'day', w:'week'}[u];
  return n + ' ' + name + (u!=='m' && n!==1 ? 's' : '');
}