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Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate1import { waitUntil } from "cloudflare:workers";
2
Usage, Billing settings and prepaid AI credit; fixes from the UX audit3import type { Comparison } from "@g1t/contracts";
4
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate5import { type SharedCache, contentCache, weightOfLines } from "./content-cache";
6import { type FileHtml, type HighlightedComparison, type HighlightedFile, diffContent, htmlOfFile, withHtml } from "./diff";
Usage, Billing settings and prepaid AI credit; fixes from the UX audit7
Fast pages, required checks on the branch, self-hosted runners, honest incidents8// Shiki and its grammars load on the first file highlighted, not when the
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate9// Worker starts: most requests highlight nothing. The module is asked for
10// once per isolate.
11let shikiModule: Promise<typeof import("./shiki")> | undefined;
12const shiki = () => (shikiModule ??= import("./shiki"));
Sidebar: no settings flash on the way into a repository, and a better slide13
14const MAX_HIGHLIGHT_CHARS = 200_000;
15
16/**
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate17 * Highlighting is most of the work of a file's page (about two thirds of a
18 * small file's, nine tenths of a large one's), and the same text always
19 * highlights the same way. So it is kept by a hash of the text and its
20 * language: in the isolate, and in the data centre's cache for the other
21 * isolates there (lib/content-cache.ts). A file read again on another
22 * branch or commit, through blame, or by the next crawler, is highlighted
23 * once. Bump `HIGHLIGHT_VERSION` when the theme, the grammars, Shiki or
24 * `linesToHtml` change what they make.
Sidebar: no settings flash on the way into a repository, and a better slide25 */
You choose how g1t looks: Auto follows your system, Light and Dark stay put, set from the account menu, the phone's You and help sheet, Settings → Account or the command palette; the page is drawn in your choice from the first byte, every colour has a light value that reads at 4.5:1 or better, code and diffs are highlighted for both, diagrams and the document editor follow along, the product tour and the g1t mark's avatar stay dark, and Dark is what you see until you choose; the workspaces guide says how.26export const HIGHLIGHT_VERSION = "v2";
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate27
28function dataCentre(): SharedCache | null {
Sidebar: no settings flash on the way into a repository, and a better slide29 try {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate30 return (caches as unknown as { default: Cache }).default ?? null;
Sidebar: no settings flash on the way into a repository, and a better slide31 } catch {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate32 // No cache (local development).
Sidebar: no settings flash on the way into a repository, and a better slide33 return null;
34 }
35}
36
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate37function defer(work: Promise<unknown>) {
38 try {
39 waitUntil(work);
40 } catch {
41 // Outside a request: the write finishes or not; nothing waits on it.
42 }
43}
44
Sidebar: no settings flash on the way into a repository, and a better slide45/**
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate46 * About 8 MB of highlighted lines per isolate (two bytes a character); one
47 * file up to a quarter of that, which a 1,800-line file fits. A pull
48 * request's first screens are at most 40,000 characters of text, about
49 * ten times that highlighted.
50 */
51const linesCache = contentCache<string[]>({
52 name: "highlight-lines",
53 version: HIGHLIGHT_VERSION,
54 maxWeight: 4_000_000,
55 weigh: weightOfLines,
56 shared: dataCentre,
57 defer,
58});
59
60const filesCache = contentCache<FileHtml>({
61 name: "highlight-diff",
62 version: HIGHLIGHT_VERSION,
63 maxWeight: 2_000_000,
64 weigh: (html) => html.reduce((sum, hunk) => sum + weightOfLines(hunk), 0),
65 shared: dataCentre,
66 defer,
67});
68
69/**
Sidebar: no settings flash on the way into a repository, and a better slide70 * A file's lines as highlighted HTML, one string per line, or null when its
71 * language is unknown or it is too large.
72 */
73export async function highlightLines(path: string, text: string): Promise<string[] | null> {
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate74 const { languageOf } = await shiki();
Sidebar: no settings flash on the way into a repository, and a better slide75 const lang = languageOf(path);
76 if (!lang || text.length > MAX_HIGHLIGHT_CHARS) return null;
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate77 const code = text.replace(/\n$/, "");
78 return linesCache([lang, code], async () => {
79 const { getHighlighter, linesToHtml } = await shiki();
80 try {
81 return linesToHtml(await getHighlighter(), code, lang);
82 } catch {
83 return null;
84 }
85 });
Sidebar: no settings flash on the way into a repository, and a better slide86}
Usage, Billing settings and prepaid AI credit; fixes from the UX audit87
88/**
89 * How much of a change is highlighted before the page is sent: its first
90 * screens. The rest is highlighted in the browser as it comes near
91 * (components/diff-view.tsx), so a large change never holds the page up.
92 */
93const FIRST_SCREENS_CHARS = 40_000;
94
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate95/** A file's diff highlighted, from the cache when the same lines were highlighted before. */
96async function highlightFileCached(file: Comparison["files"][number]): Promise<HighlightedFile | null> {
97 const { highlightFile, languageOf } = await shiki();
98 const lang = languageOf(file.path);
99 // Nothing to highlight: highlightFile says so without any work.
100 if (!lang || file.binary) return null;
101 const html = await filesCache([lang, diffContent(file)], async () => {
102 const highlighted = await highlightFile(file).catch(() => null);
103 return highlighted ? htmlOfFile(highlighted) : null;
104 });
105 return html ? withHtml(file, html) : null;
106}
107
Usage, Billing settings and prepaid AI credit; fixes from the UX audit108/**
109 * A comparison with its first files' lines highlighted, in order, until
110 * the budget runs out, so what is on screen when the page arrives already
111 * has its colours.
112 */
113export async function highlightFirstFiles(comparison: Comparison): Promise<HighlightedComparison> {
114 let budget = FIRST_SCREENS_CHARS;
115 const files: HighlightedFile[] = [];
116 for (const file of comparison.files) {
117 const size = file.hunks.reduce((sum, hunk) => sum + hunk.lines.reduce((n, line) => n + line.text.length + 1, 0), 0);
118 if (budget <= 0 || size > budget || file.binary) {
119 // Past the first screens: everything after it waits for the browser.
120 budget = 0;
121 files.push(file);
122 continue;
123 }
124 budget -= size;
Merge the site's CPU: code highlighted once per data centre by content, markdown parsed once per text, and the request handler built once per isolate125 files.push((await highlightFileCached(file).catch(() => null)) ?? file);
Usage, Billing settings and prepaid AI credit; fixes from the UX audit126 }
127 return { ...comparison, files };
128}

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