1// ermite.js: the behaviour of the pages that htmx and hx-live do not give.
2//
3// 1. Keys. A global key *sequence* state machine ("g" then "h") and the
4// keystrokes aimed at inputs cannot be declared with hx-on. The keydown
5// handler only translates keys into DOM events named "k-<name>" on <body>;
6// keys.templ binds each of them (hx-on, one line each) to a function of
7// window.ermite below, which does the work: row cursor, dialogs, filters,
8// diff layout, permalink.
9// 2. Clicks on [data-fire] elements fire the same events (header buttons).
10// 3. ermiteLive applies the fragments of the event stream (see events.go).
11// 4. The file of the diff in view is marked in the table of contents.
12// 5. A handler that fails is shown in the hint badge.
13// 6. The lines a diff hides load in place (ermiteGaps; e and E).
14// 7. The service worker (ermiteInstall).
15(() => {
16 // Marks the page as scripted: what does nothing without scripts (the filters,
17 // the "go to" and help buttons) is hidden until this class is set (see the
18 // utilities of 10-base.css).
19 document.documentElement.classList.add('js');
20
21 const $ = (sel, root = document) => root.querySelector(sel);
22 const $$ = (sel, root = document) => [...root.querySelectorAll(sel)];
23 const body = () => document.body;
24
25 // flash shows a message in the hint badge (body[data-flash], a status
26 // region), then clears it unless another message came in the meantime.
27 let flashTimer = 0;
28 const flash = (msg, ms = 2000) => {
29 body().dataset.flash = msg;
30 clearTimeout(flashTimer);
31 flashTimer = setTimeout(() => (body().dataset.flash = ''), ms);
32 };
33
34 const visibleRows = () => $$('[data-rows] > :not([hidden])');
35 // setCursor puts data-cursor on el and takes it from the others.
36 const setCursor = (el, others) => {
37 for (const o of others) if (o !== el) o.removeAttribute('data-cursor');
38 el.setAttribute('data-cursor', '');
39 };
40 const scrollPage = (to) => {
41 scrollTo(0, to);
42 $('#main')?.scrollTo(0, to);
43 };
44
45 const ermite = {
46 flash,
47 fire(name) {
48 body().dispatchEvent(new CustomEvent('k-' + name, { bubbles: false }));
49 },
50
51 // Row cursor: j / k. In the side panel they move the focus between its
52 // controls instead.
53 move(d) {
54 if ($('dialog[open]')) return;
55 if (window.ermiteMR?.stepFiles(d) || window.ermiteRail.step(d)) return;
56 const rows = visibleRows();
57 if (!rows.length) {
58 scrollBy(0, d * 180);
59 $('#main')?.scrollBy(0, d * 180);
60 return;
61 }
62 const i = rows.findIndex((r) => r.hasAttribute('data-cursor'));
63 const j = Math.max(0, Math.min(rows.length - 1, i + d));
64 setCursor(rows[j], $$('[data-rows] > [data-cursor]'));
65 rows[j].scrollIntoView({ block: 'nearest' });
66 window.ermiteTree?.sync(rows[j]);
67 window.ermiteFinder?.sync(); // the rows may be the file finder's options
68 const mark = j + 1 + '/' + rows.length;
69 body().dataset.nav = mark;
70 setTimeout(() => body().dataset.nav === mark && (body().dataset.nav = ''), 1500);
71 },
72 // gg / G: first or last row, or the top or bottom of the page.
73 edge(last) {
74 const rows = visibleRows();
75 const row = last ? rows.at(-1) : rows[0];
76 if (!row) return scrollPage(last ? 1e9 : 0);
77 setCursor(row, $$('[data-rows] > [data-cursor]'));
78 row.scrollIntoView({ block: 'nearest' });
79 window.ermiteTree?.sync(row);
80 window.ermiteFinder?.sync();
81 },
82 open() {
83 if ($('dialog[open]') || window.ermiteTree?.open()) return;
84 $('[data-cursor] a')?.click();
85 },
86 // l / h: in the Files view, open a directory or a file / close a directory
87 // or go up. Elsewhere: into the side panel (the current file of a merge
88 // request, else its main action, else its first control) and back to the
89 // content. Enter then activates the control.
90 rail(into) {
91 if ($('dialog[open]')) return;
92 if (window.ermiteTree?.key(into)) return;
93 if (into && window.ermiteMR?.focusFiles()) return flash('files · j k move · enter open · h back');
94 if (!into && window.ermiteMR?.leaveFiles()) return;
95 const msg = into ? window.ermiteRail.enter() : window.ermiteRail.leave();
96 if (msg) flash(msg);
97 },
98 // openFile opens a file of the diff the table of contents links to.
99 openFile(id) {
100 const f = document.getElementById(id);
101 if (f) f.open = true;
102 },
103 focusFilter() {
104 $('[data-filter]')?.focus();
105 },
106 go(sel) {
107 $(sel)?.click();
108 },
109 tab(key) {
110 $(`.tabs [data-key=${key}]`)?.click();
111 },
112
113 // The preference "single-key shortcuts" (ermiteKeys): the checkbox of the
114 // help dialog and the action of the palette.
115 setKeysOff(off) {
116 window.ermiteKeys.set(off);
117 },
118 toggleKeys() {
119 const off = !window.ermiteKeys.off();
120 window.ermiteKeys.set(off);
121 ermite.closeDialogs();
122 flash(off ? 'single-key shortcuts off · ctrl k and esc still work' : 'single-key shortcuts on');
123 },
124
125 // Dialogs.
126 closeDialogs() {
127 for (const d of $$('dialog[open]')) d.close();
128 },
129 dialog(id, focusId) {
130 const d = document.getElementById(id);
131 if (!d) return;
132 ermite.closeDialogs();
133 d.showModal();
134 if (id === 'panel-cmd') window.ermiteCmd?.sync();
135 if (focusId) document.getElementById(focusId)?.focus();
136 },
137
138 // filter hides the rows that do not contain the text of an input. The
139 // input says which rows (data-filter, or data-pick for a list without a
140 // cursor) and, optionally, the groups to hide when they have no row left
141 // (data-groups). The cursor goes to the first row left.
142 filter(input) {
143 const rows = ermite.hide(input);
144 if (input.dataset.filter) {
145 const first = rows.find((r) => !r.hidden);
146 for (const r of rows) r.toggleAttribute('data-cursor', r === first);
147 }
148 },
149 // hide applies the text of a filter input to its rows and groups, without
150 // moving the cursor, and returns the rows.
151 hide(input) {
152 const t = input.value.toLowerCase();
153 // A bare data-filter marks a field with its own search (the file finder
154 // of the Files view): there are no rows to hide.
155 const sel = input.dataset.filter || input.dataset.pick;
156 if (!sel) return [];
157 const rows = $$(sel);
158 for (const r of rows) r.hidden = !r.textContent.toLowerCase().includes(t);
159 if (input.dataset.groups) {
160 for (const g of $$(input.dataset.groups)) g.hidden = !rows.some((r) => !r.hidden && g.contains(r));
161 }
162 return rows;
163 },
164 // The "go to" palette (ermiteCmd below).
165 cmdFilter(input) {
166 window.ermiteCmd.filter(input);
167 },
168 cmdKey(e) {
169 window.ermiteCmd.key(e);
170 },
171
172 // Diff.
173 layout(mode) {
174 const el = $('[data-diff]');
175 if (!el) return;
176 el.dataset.diff = mode;
177 try { sessionStorage.setItem('diff', mode); } catch { /* storage refused: the layout holds for this page */ }
178 for (const d of $$('[data-file]')) if ($('.dt', d)) d.open = true;
179 },
180 collapse() {
181 const files = $$('[data-file]');
182 const open = !files.some((d) => d.open);
183 for (const d of files) d.open = open;
184 },
185 // e / E: the whole file in view, or every file of the diff, with every
186 // line its hunks hide.
187 expandFile() {
188 const f = window.ermiteGaps.current();
189 if (!f) return flash('no file in view');
190 f.open = true;
191 window.ermiteGaps.file(f).then((r) => {
192 if (!r.done) return; // load said what failed
193 flash(r.lines ? 'whole file' : 'nothing hidden in this file');
194 });
195 },
196 async expandAll() {
197 const files = $$('[data-file]').filter((f) => f.querySelector('tr.gap'));
198 if (!files.length) return flash('nothing hidden in the loaded files');
199 flash('loading every line…', 10000);
200 for (const f of files) {
201 if (!(await window.ermiteGaps.file(f)).done) return; // load said what failed
202 }
203 flash('every line of the loaded files');
204 },
205 nextNote() {
206 const notes = $$('#diffs .cmt');
207 if (!notes.length) return;
208 const i = notes.findIndex((n) => n.getBoundingClientRect().top > innerHeight / 3);
209 const n = notes[i < 0 ? 0 : i];
210 const d = n.closest('details');
211 if (d) d.open = true;
212 n.scrollIntoView({ block: 'center' });
213 },
214
215 // y: pin the URL to the commit and copy it.
216 async permalink() {
217 const b = body().dataset;
218 if (!b.sha) return flash('no ref to pin on this page');
219 const enc = (b.ref || '').split('/').map(encodeURIComponent).join('/').replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
220 // The ref follows the repository and the route: /<repo>/<tree|blob|commits>/<ref>.
221 const path = enc ? location.pathname.replace(new RegExp('^(/[^/]+/[^/]+/)' + enc + '(?=/|$)'), '$1' + b.sha) : location.pathname;
222 if (path === location.pathname) return flash('this page has no ref to pin');
223 history.replaceState(null, '', path + location.hash);
224 try {
225 await navigator.clipboard.writeText(location.href);
226 flash('permalink ' + b.sha.slice(0, 7) + ' copied');
227 } catch {
228 flash('permalink in the address bar (copy refused)');
229 }
230 },
231
232 // The [copy] button of a clone line: the label says "Copied" for 1.5 s,
233 // and so does the accessible name; the hint badge (a status region)
234 // announces it.
235 async copy(btn) {
236 const line = btn.closest('.clone-line')?.querySelector('code')?.textContent ?? '';
237 btn.dataset.idleName ||= btn.getAttribute('aria-label') || '';
238 let ok = true;
239 try { await navigator.clipboard.writeText(line); } catch { ok = false; }
240 btn.textContent = ok ? 'Copied' : 'Copy failed';
241 btn.setAttribute('aria-label', (ok ? 'copied: ' : 'copy failed: ') + line);
242 flash(ok ? 'copied' : 'copy failed', 1500);
243 clearTimeout(btn._restore);
244 btn._restore = setTimeout(() => {
245 btn.textContent = btn.dataset.label;
246 btn.setAttribute('aria-label', btn.dataset.idleName);
247 }, 1500);
248 },
249 };
250 window.ermite = ermite;
251
252 // The "go to" palette is an editable combobox with a listbox popup: the
253 // focus stays in #cmd-q, the options are the <li> of #cmd-list, and the one
254 // with data-cursor is the active one (aria-selected on it, aria-activedescendant
255 // on the field). sync keeps the two in step; it runs on every change of the
256 // cursor or of the list, including the file hits files.js adds later.
257 // Self-contained: jstest/palette.test.mjs evaluates this block alone.
258 window.ermiteCmd = (() => {
259 const list = () => document.getElementById('cmd-list');
260 const field = () => document.getElementById('cmd-q');
261 const options = () => [...list().querySelectorAll(':scope > li')];
262 let seq = 0;
263 const moveCursor = (li) => {
264 for (const o of options()) if (o !== li) o.removeAttribute('data-cursor');
265 li.setAttribute('data-cursor', '');
266 };
267 function sync() {
268 const input = field();
269 if (!input || !list()) return;
270 const all = options();
271 const shown = all.filter((li) => !li.hidden);
272 const cur = shown.find((li) => li.hasAttribute('data-cursor'));
273 for (const li of all) {
274 li.id ||= 'cmd-h' + seq++;
275 li.setAttribute('role', 'option');
276 li.setAttribute('aria-selected', li === cur ? 'true' : 'false');
277 }
278 input.setAttribute('aria-expanded', shown.length ? 'true' : 'false');
279 if (cur) input.setAttribute('aria-activedescendant', cur.id);
280 else input.removeAttribute('aria-activedescendant');
281 }
282 return {
283 sync,
284 // filter hides the entries that do not contain the text of the field.
285 // The file hits the finder adds (li.finder-hit, files.js) have no data-k:
286 // the finder owns them.
287 filter(input) {
288 const t = input.value.toLowerCase().trim();
289 const items = options().filter((li) => li.hasAttribute('data-k'));
290 for (const li of items) li.hidden = !li.getAttribute('data-k').includes(t);
291 const first = items.find((li) => !li.hidden);
292 if (first) moveCursor(first);
293 sync();
294 },
295 key(e) {
296 const vis = options().filter((li) => !li.hidden);
297 const i = vis.findIndex((li) => li.hasAttribute('data-cursor'));
298 const step = e.key === 'ArrowDown' ? 1 : e.key === 'ArrowUp' ? -1 : 0;
299 if (step) {
300 e.preventDefault();
301 const n = vis[Math.max(0, Math.min(vis.length - 1, i + step))];
302 if (n) {
303 moveCursor(n);
304 n.scrollIntoView({ block: 'nearest' });
305 }
306 sync();
307 } else if (e.key === 'Enter') {
308 e.preventDefault();
309 vis[Math.max(i, 0)]?.querySelector('a')?.click();
310 }
311 },
312 };
313 })();
314
315 // The side panel (aside.rail) by keyboard: l enters it on its main action
316 // (the primary button) or its first control, j / k step between its shown
317 // controls (not hidden, not in a closed <details>), h leaves it for <main>.
318 // Each returns the hint to flash, if any. Self-contained: jstest/rail.test.mjs
319 // evaluates this block alone.
320 window.ermiteRail = (() => {
321 const CONTROLS = ['a', 'button', 'select', 'summary', 'input', 'textarea'];
322 const reachable = (e) => {
323 if (e.disabled || e.closest('[hidden]')) return false;
324 if (e.tagName === 'A' && !e.hasAttribute('href')) return false;
325 if (e.tagName === 'INPUT' && e.getAttribute('type') === 'hidden') return false;
326 return !e.getClientRects || e.getClientRects().length > 0;
327 };
328 const rail = () => document.querySelector('.rail');
329 // items walks the panel in document order.
330 const items = (r) => {
331 const out = [];
332 const walk = (e) => {
333 for (const c of e.children) {
334 if (CONTROLS.includes(c.tagName.toLowerCase())) { if (reachable(c)) out.push(c); }
335 else walk(c);
336 }
337 };
338 walk(r);
339 return out;
340 };
341 const inside = (r) => r && r.contains(document.activeElement);
342 const go = (e) => { e.focus(); e.scrollIntoView({ block: 'nearest' }); };
343 return {
344 enter() {
345 const r = rail();
346 if (!r) return 'no side panel on this page';
347 const list = items(r);
348 const target = list.find((e) => e.matches('.btn.primary')) || list[0];
349 if (!target) return 'nothing to act on in the side panel';
350 go(target);
351 return 'side panel · j k move · enter act · h back';
352 },
353 leave() {
354 if (inside(rail())) document.getElementById('main')?.focus({ preventScroll: true });
355 },
356 // step moves d controls within the panel; false when the focus is not in it.
357 step(d) {
358 const r = rail();
359 if (!inside(r)) return false;
360 const list = items(r);
361 const i = list.indexOf(document.activeElement);
362 const next = list[Math.max(0, Math.min(list.length - 1, i + d))];
363 if (next) go(next);
364 return true;
365 },
366 };
367 })();
368
369 // The installed app: the service worker (/-/sw.js) is registered once the
370 // page has loaded. With it and the manifest the browser offers the install
371 // by itself (the address bar of a desktop, the menu or a banner on a phone);
372 // the page leaves that offer alone. Self-contained: jstest/install.test.mjs
373 // evaluates this block alone.
374 window.ermiteInstall = (() => {
375 const api = {
376 // register installs the service worker; a browser without one, or a
377 // refusal, leaves the site working as before.
378 register() {
379 if (!navigator.serviceWorker) return Promise.resolve(null);
380 return navigator.serviceWorker.register('/-/sw.js', { scope: '/' }).catch(() => null);
381 },
382 };
383 if (document.readyState === 'complete') api.register();
384 else addEventListener('load', () => api.register(), { once: true });
385 return api;
386 })();
387
388 // The hidden lines of a diff: a row .gap holds a button that loads them
389 // (/context); the rows that come back replace the gap in the table of each
390 // layout (the unified and the split tables hold one row each for it). A
391 // file whose lines are all loaded has no gap left.
392 window.ermiteGaps = (() => {
393 const pending = new Map();
394 // load fills the gap the button is in, in both tables of its file.
395 function load(btn) {
396 const src = btn.dataset.src;
397 const row = btn.closest('tr.gap');
398 const file = row?.closest('[data-file]');
399 if (!src || !file) return Promise.resolve(0);
400 if (pending.has(src)) return pending.get(src);
401 const key = row.dataset.gap;
402 const table = btn.closest('table');
403 const focused = document.activeElement === btn;
404 btn.disabled = true;
405 const p = fetch(src, { headers: { Accept: 'text/html' }, credentials: 'same-origin' })
406 .then(async (res) => {
407 if (!res.ok) throw new Error('loading the hidden lines: ' + res.status);
408 const t = document.createElement('template');
409 t.innerHTML = await res.text();
410 let n = 0;
411 for (const table of file.querySelectorAll('table.dt')) {
412 const kind = table.classList.contains('spl') ? 'spl' : 'uni';
413 const from = t.content.querySelector('tbody[data-for="' + kind + '"]');
414 const at = [...table.querySelectorAll('tr.gap')].find((r) => r.dataset.gap === key);
415 if (!from || !at) continue;
416 const rows = [...from.children].map((r) => r.cloneNode(true));
417 n = Math.max(n, rows.filter((r) => !r.classList.contains('gap')).length);
418 at.replaceWith(...rows);
419 }
420 // The focus was on the button, which is gone: on the gap that is
421 // left in the same table, else on the content.
422 if (focused && (document.activeElement === btn || document.activeElement === document.body)) {
423 const next = [...(table?.querySelectorAll('tr.gap') || [])].find((r) => r.dataset.gap === key)?.querySelector('button');
424 if (next) next.focus({ preventScroll: true });
425 else document.getElementById('main')?.focus({ preventScroll: true });
426 }
427 return n;
428 })
429 .catch((err) => {
430 btn.disabled = false;
431 window.ermite?.flash?.(err.message, 4000);
432 return -1;
433 })
434 .finally(() => pending.delete(src));
435 pending.set(src, p);
436 return p;
437 }
438 // file loads every gap of a file, until none is left (a long gap comes
439 // back with a gap for the rest). A gap already loading is waited for.
440 // done is false when a load failed (it said why) or the file never ran
441 // out of gaps.
442 async function file(f) {
443 let lines = 0;
444 for (let guard = 0; guard < 1000; guard++) {
445 const btn = f.querySelector('tr.gap button[data-src]');
446 if (!btn) return { done: true, lines };
447 const n = await load(btn);
448 if (n < 0) return { done: false, lines };
449 if (btn.isConnected) {
450 // an answer that did not take the gap's place: stop, not loop
451 window.ermite?.flash?.('some hidden lines could not be shown', 4000);
452 return { done: false, lines };
453 }
454 lines += n;
455 }
456 window.ermite?.flash?.('the file is too long to show every line at once', 4000);
457 return { done: false, lines };
458 }
459 // current is the file in view: the one the table of contents marks, else
460 // the last whose top is above the top third of the window.
461 function current() {
462 const a = document.querySelector('.files a[aria-current="true"]');
463 const marked = a && document.getElementById(a.hash.slice(1));
464 if (marked?.matches('[data-file]')) return marked;
465 const files = [...document.querySelectorAll('[data-file]')];
466 return files.findLast((f) => f.getBoundingClientRect().top < innerHeight / 3) ?? files[0] ?? null;
467 }
468 addEventListener('click', (e) => {
469 const btn = e.target.closest?.('tr.gap button[data-src]');
470 if (btn) load(btn);
471 });
472 return { load, file, current };
473 })();
474
475 // The preference "single-character shortcuts" (WCAG 2.1.4): off, the keys
476 // that are one printable character (j, k, s, ?, :, G, 1-9 in the merge menu,
477 // …) do nothing. Shortcuts with ctrl or cmd, escape, enter and the arrows
478 // keep working. The choice lives in localStorage ("keys-off") and is made in
479 // the help dialog (a checkbox) or the palette (an action). Self-contained:
480 // jstest/keys.test.mjs evaluates this block alone.
481 window.ermiteKeys = (() => {
482 const KEY = 'keys-off';
483 let off = false;
484 try { off = localStorage.getItem(KEY) === '1'; } catch { /* no storage: on, and the choice holds for this page */ }
485 // apply shows the state: the checkbox and the note of the help dialog,
486 // and the label of the palette action.
487 function apply() {
488 const box = document.getElementById('keys-off');
489 if (box) box.checked = off;
490 const note = document.getElementById('keys-note');
491 if (note) {
492 note.textContent = off
493 ? 'Single-key shortcuts are off: only ctrl k and esc, enter and the arrows work. Turn them on again here.'
494 : 'Single-key shortcuts are on. ctrl k and esc work whatever this says.';
495 }
496 const act = document.querySelector('#cmd-list [data-fire="keys"] .lbl');
497 if (act) act.textContent = off ? 'turn single-key shortcuts on' : 'turn single-key shortcuts off';
498 }
499 function set(v) {
500 off = !!v;
501 try { localStorage.setItem(KEY, off ? '1' : ''); } catch { /* storage refused: holds for this page */ }
502 apply();
503 }
504 addEventListener('storage', (e) => {
505 if (e.key !== KEY) return;
506 off = e.newValue === '1';
507 apply();
508 });
509 apply();
510 return {
511 off: () => off,
512 set,
513 apply,
514 // blocks says whether the preference turns this key off.
515 blocks: (e) => off && e.key.length === 1,
516 };
517 })();
518
519 // 1. Keys.
520 const single = { j: 'j', k: 'k', G: 'bottom', '/': 'filter', '?': 'help', b: 'refs', f: 'cmd', ':': 'cmd', y: 'permalink',
521 s: 's', t: 't', c: 'c', r: 'r', m: 'm', n: 'next', h: 'left', l: 'right', d: 'split', u: 'unified', x: 'collapse', e: 'expand', E: 'expandAll', Enter: 'open', Escape: 'esc',
522 // the merge request page (mr.js): the merge menu, mark read
523 M: 'merge', R: 'read' };
524 // "g t" is the key "t": the tabs have one event each.
525 const goto = { h: 'gh', t: 't', c: 'c', r: 'r', m: 'm', g: 'top', f: 'gf' };
526 let pending = 0;
527 let pendingTimer = 0;
528 addEventListener('keydown', (e) => {
529 const typing = e.target.closest('input:not([type=checkbox], [type=radio], [type=submit], [type=button]), textarea, select, [contenteditable]');
530 // ctrl k / cmd k opens the palette; in a field only cmd k, so that the
531 // field keeps ctrl k (kill to end of line on macOS).
532 if ((e.metaKey || (e.ctrlKey && !typing)) && !e.altKey && !e.shiftKey && e.key.toLowerCase() === 'k') { e.preventDefault(); pending = 0; return ermite.fire('cmd'); }
533 if (e.ctrlKey || e.metaKey || e.altKey) return;
534 const mr = window.ermiteMR;
535 if (e.key === 'Escape') {
536 pending = 0;
537 if (mr?.closeMenus() || mr?.leaveFiles()) return;
538 if (typing) e.target.blur();
539 return ermite.fire('esc');
540 }
541 // Single-character shortcuts turned off: only the keys above work.
542 if (window.ermiteKeys.blocks(e)) { pending = 0; return; }
543 // An open merge menu takes its keys (1-9, D) before the field check: its
544 // radios and its checkbox hold the focus.
545 if (mr?.menuKey(e)) return;
546 if (typing) return;
547 // An open dialog takes only the keys that move between dialogs: the page
548 // behind it does not react (scripted clicks would go through inert).
549 if ($('dialog[open]') && !['?', 'b', ':', 'f', 'Enter'].includes(e.key)) { pending = 0; return; }
550 if (e.key === 'Enter' && e.target.closest('a, button, summary')) return;
551 if (pending) {
552 const name = goto[e.key];
553 pending = 0;
554 if (name) { e.preventDefault(); ermite.fire(name); }
555 return;
556 }
557 if (e.key === 'g') { pending = 1; clearTimeout(pendingTimer); pendingTimer = setTimeout(() => (pending = 0), 1200); return; }
558 // The arrows and Home / End are the tree's only while the focus is on one of
559 // its rows (they scroll, or move the focus, anywhere else); j k l h are
560 // page-level keys, as on the other lists.
561 if (!e.shiftKey && e.target.closest?.('#tree-rows') && window.ermiteTree?.arrow(e.key)) { e.preventDefault(); return; }
562 const name = single[e.key];
563 if (!name) return;
564 if (e.key !== 'Enter' || !$('dialog[open]')) e.preventDefault();
565 ermite.fire(name);
566 });
567
568 // 2. A [data-fire] element does what the key of that name does (the header
569 // buttons, the diff layout links). The link to the refs page works without
570 // scripts and is upgraded here to open the dialog; a click with a modifier
571 // keeps its meaning (new tab).
572 addEventListener('click', (e) => {
573 const el = e.target.closest?.('[data-fire]');
574 if (!el || e.button || e.ctrlKey || e.metaKey || e.shiftKey || e.altKey) return;
575 e.preventDefault();
576 ermite.fire(el.dataset.fire);
577 });
578 for (const a of $$('a[data-fire="refs"]')) {
579 a.setAttribute('aria-haspopup', 'dialog');
580 a.setAttribute('aria-controls', 'panel-refs');
581 }
582
583 // A login link signs in without a click: its page submits its form once a
584 // browser shows it, not while it is prerendered.
585 const auto = $('form[data-autosubmit]');
586 if (auto) {
587 const go = () => auto.requestSubmit();
588 if (document.prerendering) document.addEventListener('prerenderingchange', go, { once: true });
589 else go();
590 }
591
592 // In the app shell the page does not scroll, <main> does: give it focus so arrows,
593 // PageUp/PageDown and space scroll the content without a click first.
594 if (!location.hash) document.getElementById('main')?.focus({ preventScroll: true });
595
596 // 4. The table of contents of a diff marks the file in view: the last file
597 // in the top third of the window, else the last file whose top is above that
598 // line (the first file when none is). One observer tracks the files in the
599 // band; it reports only when a file enters or leaves it, so a scroll costs
600 // nothing in between, and a jump that skips the band is caught by the scan.
601 let files = $$('.dfile');
602 const links = new Map($$('.files a[href^="#"]').map((a) => [a.hash.slice(1), a]));
603 if (files.length && links.size && 'IntersectionObserver' in window) {
604 const inBand = new Set();
605 let current = null;
606 const mark = () => {
607 const f = files.findLast((x) => inBand.has(x))
608 ?? files.findLast((x) => x.getBoundingClientRect().top < innerHeight / 3)
609 ?? files[0];
610 if (f === current) return;
611 links.get(current?.id)?.removeAttribute('aria-current');
612 const a = links.get(f.id);
613 a?.setAttribute('aria-current', 'true');
614 // The list scrolls on its own: the current file stays in it. Only the
615 // list moves, never the page (scrollIntoView would scroll the page to
616 // the list when the rail is under the diff).
617 const box = a?.closest('.files');
618 if (a && box && box.scrollHeight > box.clientHeight && !box.contains(document.activeElement)) {
619 const top = a.offsetTop;
620 if (top < box.scrollTop) box.scrollTop = top;
621 else if (top + a.offsetHeight > box.scrollTop + box.clientHeight) box.scrollTop = top + a.offsetHeight - box.clientHeight;
622 }
623 current = f;
624 };
625 const io = new IntersectionObserver((entries) => {
626 for (const e of entries) {
627 if (e.isIntersecting) inBand.add(e.target);
628 else inBand.delete(e.target);
629 }
630 mark();
631 }, { rootMargin: '0px 0px -67% 0px' });
632 for (const f of files) io.observe(f);
633 // A window of files of a merge request came in (mr.js): its files replace
634 // placeholders, which the observer and the list knew by element.
635 ermite.watchFile = (f, old) => {
636 if (old) { io.unobserve(old); inBand.delete(old); }
637 files = $$('.dfile');
638 for (const x of [...inBand]) if (!x.isConnected) inBand.delete(x);
639 if (current && !current.isConnected) current = document.getElementById(current.id);
640 io.observe(f);
641 };
642 }
643
644 // 5. A failure of a handler or of a request (htmx logs it to the console
645 // already) is shown, so that a key that does nothing is not a mystery.
646 addEventListener('htmx:error', (e) => {
647 if (e.target.closest?.('.hint-live')) return; // the stream says so itself ("live updates paused")
648 const err = e.detail?.error;
649 flash('something went wrong' + (err?.message ? ': ' + err.message : ''), 4000);
650 });
651})();
652
653// ermiteLive applies the fragments of the event stream (/-/events, see
654// internal/adapters/web/events.go). A fragment is a top-level element with an
655// id: it replaces the element of the page that has the same id. A fragment
656// marked data-gone removes it; a row of a repository the home page does not
657// list yet is added at the top of the list. A slot (data-slot: the place of a
658// banner, a persistent status region) keeps its element and only gets the
659// children of the fragment, so that screen readers announce the change. A gap,
660// which says the page may have missed events or that what it shows changed,
661// reloads the page. A stream the server refuses on reconnection (the
662// repository is gone, the session ended) makes the page reload.
663window.ermiteLive = (() => {
664 let reloading = false;
665 let stopped = false;
666 // A stream that drops and comes back within LOST_AFTER (a proxy or the
667 // server closing it, a network hiccup) is not worth a message.
668 const LOST_AFTER = 5000;
669 let lostTimer = 0;
670 // The focus survives a swap. focusables are the controls of a fragment in
671 // document order; where(root) says which one has the focus (its id, else its
672 // tag and href or name, and its index among the controls) and refocus finds
673 // it again in the element that replaced root.
674 const FOCUSABLE = 'a[href], button:not([disabled]), input:not([type=hidden]):not([disabled]), select:not([disabled]), textarea:not([disabled]), summary, [tabindex]';
675 // shown: not inside a hidden element (a filtered row, a folded block); the
676 // browser refuses the focus there.
677 const shown = (e) => !e.closest('[hidden]') && (!e.checkVisibility || e.checkVisibility());
678 const focusables = (root) => [...root.querySelectorAll(FOCUSABLE)].filter(shown);
679 // take focuses e and says whether the focus is there now.
680 const take = (e) => { e.focus({ preventScroll: true }); return document.activeElement === e; };
681 const where = (root) => {
682 const a = document.activeElement;
683 if (!a || a === document.body || !root.contains(a)) return null;
684 if (a === root) return { self: true };
685 const all = focusables(root);
686 return { id: a.id, tag: a.tagName, href: a.getAttribute('href'), name: a.getAttribute('name'), index: all.indexOf(a) };
687 };
688 const refocus = (root, w) => {
689 if (w.self) return root.focus({ preventScroll: true });
690 const all = focusables(root);
691 const same = (e) => e.tagName === w.tag;
692 const target =
693 (w.id && all.find((e) => e.id === w.id)) ||
694 (w.href != null && all.find((e) => same(e) && e.getAttribute('href') === w.href)) ||
695 (w.name != null && all.find((e) => same(e) && e.getAttribute('name') === w.name)) ||
696 (all[w.index] && same(all[w.index]) && all[w.index]) ||
697 all[0];
698 if (target) target.focus({ preventScroll: true });
699 else if (root.hasAttribute('tabindex')) root.focus({ preventScroll: true });
700 };
701 // lostFocus: the element that had the focus inside is gone. The focus goes to
702 // the first control of the next shown row, else of the nearest shown row
703 // before, else to the content.
704 const lostFocus = (after, before) => {
705 const tryRow = (e) => {
706 if (!shown(e)) return false;
707 const c = focusables(e)[0] || (e.hasAttribute('tabindex') ? e : null);
708 return !!c && take(c);
709 };
710 for (let e = after; e; e = e.nextElementSibling) if (tryRow(e)) return;
711 for (let e = before; e; e = e.previousElementSibling) if (tryRow(e)) return;
712 document.getElementById('main')?.focus({ preventScroll: true });
713 };
714 const setState = (s) => { const el = document.querySelector('.hint-live'); if (el) el.dataset.state = s; };
715 return {
716 // lost is htmx:sse:close and htmx:sse:error: "live updates paused" shows
717 // only if the stream is still down LOST_AFTER later.
718 lost() {
719 if (lostTimer) return;
720 lostTimer = setTimeout(() => { lostTimer = 0; setState('offline'); }, LOST_AFTER);
721 },
722 // back is htmx:sse:after:connection.
723 back() {
724 clearTimeout(lostTimer);
725 lostTimer = 0;
726 setState('live');
727 },
728 swap(html) {
729 const t = document.createElement('template');
730 t.innerHTML = html;
731 const cursor = document.querySelector('[data-rows] > [data-cursor]');
732 const cursorKey = cursor?.id || cursor?.querySelector('a')?.getAttribute('href');
733 for (const el of [...t.content.children]) {
734 const old = el.id && document.getElementById(el.id);
735 const had = old ? where(old) : null; // the focus is inside what is replaced
736 if (el.hasAttribute('data-gone')) {
737 const after = old?.nextElementSibling, before = old?.previousElementSibling;
738 old?.remove();
739 if (had) lostFocus(after, before);
740 continue;
741 }
742 if (!old) {
743 const rows = document.getElementById('repo-rows');
744 if (rows && el.id.startsWith('repo-')) { rows.prepend(el); window.htmx?.process(el); }
745 continue;
746 }
747 if (old.hasAttribute('data-slot')) {
748 old.replaceChildren(...el.childNodes);
749 if (had) refocus(old, had);
750 continue;
751 }
752 if (old.hasAttribute('data-cursor')) el.setAttribute('data-cursor', '');
753 old.replaceWith(el);
754 window.htmx?.process(el);
755 if (had) refocus(el, had);
756 }
757 // The rows may have changed under an active filter: apply it again and
758 // keep the cursor on its row while that row is still shown.
759 for (const input of document.querySelectorAll('input[data-filter]')) {
760 if (input.value) window.ermite?.hide(input);
761 }
762 if (!cursorKey) return;
763 const rows = [...document.querySelectorAll('[data-rows] > *')];
764 const back = rows.find((r) => !r.hidden && (r.id === cursorKey || r.querySelector('a')?.getAttribute('href') === cursorKey));
765 if (back) for (const r of rows) r.toggleAttribute('data-cursor', r === back);
766 },
767 reload() {
768 if (reloading) return;
769 reloading = true;
770 setTimeout(() => location.reload(), 300);
771 },
772 // error handles htmx:sse:error (detail.status is the status of a refused
773 // reconnection). hx-sse retries for ever; a 404 or a 401 will not change by
774 // itself, and the fetched page says what is the matter (or has no stream).
775 // A page that reloaded for this a moment ago and still gets refused would
776 // loop: it stops following the stream instead (see gate).
777 error(status) {
778 if (status !== 404 && status !== 401) return;
779 let last = 0;
780 try { last = +sessionStorage.getItem('ermite-live-reload') || 0; } catch { /* no storage: no guard */ }
781 if (Date.now() - last < 15000) { stopped = true; return; }
782 try { sessionStorage.setItem('ermite-live-reload', String(Date.now())); } catch { /* idem */ }
783 this.reload();
784 },
785 // gate is htmx:sse:before:connection: once stopped, no more attempts.
786 gate(event) {
787 if (stopped) event.preventDefault();
788 },
789 };
790})();